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WO2012035278A1 - Method for draining water from an aggregate cluster - Google Patents

Method for draining water from an aggregate cluster Download PDF

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Publication number
WO2012035278A1
WO2012035278A1 PCT/FR2011/052138 FR2011052138W WO2012035278A1 WO 2012035278 A1 WO2012035278 A1 WO 2012035278A1 FR 2011052138 W FR2011052138 W FR 2011052138W WO 2012035278 A1 WO2012035278 A1 WO 2012035278A1
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WO
WIPO (PCT)
Prior art keywords
aggregates
water
cluster
compound
aggregate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
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PCT/FR2011/052138
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French (fr)
Inventor
Nicolas Richard
Patrick Tintillier
Florence Serre
Emmanuel Villard
Alain Jacquet
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Lafarge SA
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Lafarge SA
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Publication of WO2012035278A1 publication Critical patent/WO2012035278A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B5/00—Drying solid materials or objects by processes not involving the application of heat
    • F26B5/005—Drying solid materials or objects by processes not involving the application of heat by dipping them into or mixing them with a chemical liquid, e.g. organic; chemical, e.g. organic, dewatering aids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B2200/00—Drying processes and machines for solid materials characterised by the specific requirements of the drying good
    • F26B2200/14—Sand

Definitions

  • the present invention relates to a method for accelerating and / or increasing the drainage of a cluster of aggregates, especially sand.
  • Aggregates for use in hydraulic or hydrocarbon compositions are generally stored prior to use in the form of heaps or aggregates.
  • These clusters can comprise a large amount of water, for example more than 25% by weight of water relative to the mass of the cluster of aggregates, the amount of water being very variable and depending in particular on the storage duration of the cluster.
  • This water may come from the aggregate extraction site, the aggregate extraction process, a possible aggregate washing operation or atmospheric conditions.
  • water stored in a cluster of aggregates refers only to the water stored on the surface of the grains and between the grains of the aggregate cluster without taking into account the water stored in the pores. aggregates.
  • aggregates are generally sold by weight and aggregates buyers prefer that the amount of water purchased is as low as possible or, at least, is substantially constant from one batch of aggregates to another.
  • a maximum amount of water present in the aggregates is generally provided in the conditions of sale of aggregates.
  • the aggregates when used for the production of a hydrocarbon composition, the aggregates must be dried in an oven before being mixed with the other constituents of the hydrocarbon composition. The cost of the drying operation increases as the amount of water contained in the aggregates increases.
  • a waiting period is therefore frequently provided between the production and / or washing of the aggregates and their use.
  • the aggregates are stored so that part of the water they contain is evacuated by gravity or evaporation.
  • the storage of large quantities of aggregates represents a significant cost.
  • Aggregates can be stored under a shelter but are, to reduce storage costs, most often stored outdoors. The drying can then at least partly ineffective if the weather conditions are not favorable.
  • the water contained in the aggregates can, at least in part, be recovered by a mechanical action, for example by the passage of aggregates in a centrifuge.
  • a mechanical action for example by the passage of aggregates in a centrifuge.
  • the cost of the operation is generally not compatible with the low sales price of aggregates.
  • US Patent 6,797,180 discloses a method of removing at least a portion of the water contained in a wet sand of adding to the sand an anionic or nonionic surfactant.
  • the products tested in US Pat. No. 6,797,180 are listed below: sodium dioctyl sulphosuccinate, nonylphenol polyethylene, a mixture of nonylphenol polyethylene and octylphenol polyethyleneoxide ether, sodium dodecylbenzene sulphonate, polyoxyethylene polyoxypropylene and a dioleate of polyoxyethylene glycol.
  • the tests are carried out by placing the sand containing the water and the treatment agent in a centrifuge.
  • the problem to be solved by the invention is to provide a wet aggregates water drainage process in a few hours.
  • the present invention relates to a process for draining water by gravity from a cluster of aggregates, the aggregates comprising, with respect to the substantially dry mass of aggregates, less than 20% by weight of particles having a average size less than 100 ⁇ , the method comprising the following steps:
  • the initial mass of the cluster of aggregates after its formation being greater than 5 tons
  • the cluster of aggregates comprising, after its formation, initially less than 40%, preferably less than 30%, more preferably less than 20%, for example less than about 15%, by weight of water relative to the substantially dry mass of the aggregate cluster;
  • substantially dry refers to aggregates for which the water stored at the surface of the grains and between the grains of the aggregate cluster has been substantially removed.
  • the present invention also relates to a hydraulic or hydrocarbon composition comprising aggregates treated according to the method described above.
  • the quantity of water contained in the aggregates is reduced, thus reducing the cost of the drying operation in an oven or in an oven;
  • the process according to the present invention does not entail any modification of the methods of manufacture of the hydraulic or hydrocarbon compositions in which the aggregates are added.
  • the compound used according to the invention has no substantial foaming effect in the hydraulic or hydrocarbon composition;
  • the process according to the invention has no negative influence on the properties of use of the hydraulic and hydrocarbon compositions.
  • the compound used according to the invention does not significantly disturb the short-term or long-term mechanical strengths of the hydraulic composition and has no significant retarding effect; and at least for the cationic polymer in liquid form having a charge density greater than or equal to 0.5 meq / g and an intrinsic viscosity of 0.01 to 0.8 dl / g used according to the present invention, the adhesion between the treated granules and a hydrocarbon binder is improved; and
  • the drainage performance due to the compounds used according to the invention are at least partially independent of the mineralogical nature, for example limestone or siliceous, of the granulate.
  • the invention has the advantage of being used in several industries, including the building industry, the chemical industry (adjuvants) and all construction and waterproofing markets (building or civil engineering), from the road or roof shingles.
  • hydraulic binder preferably means a powdery material which, when mixed with water, forms a paste which sets and hardens as a result of reactions and hydration processes, and which after curing retains its strength. and its stability even under water.
  • An example of a hydraulic binder is cement, for example Portland cement.
  • hydraulic composition preferably means a mixture of a hydraulic binder, with water, optionally aggregates, optionally adjuvants according to EN 934-2, and optionally additions.
  • hydraulic composition preferably means a composition in the fresh or hardened state.
  • the hydraulic composition according to the invention preferably means a cement slurry, a mortar or a concrete.
  • hydrocarbon-based binder preferably means a substance comprising a hydrocarbon mixture, which is highly viscous or even solid at ambient temperature.
  • the hydrocarbon binder can for example be natural bitumen or crude bitumen derived from petroleum (pure bitumen NF EN 12591, special bitumen of "hard” grade NF EN 13924, etc.).
  • hydrocarbon composition preferably means a composition comprising a hydrocarbon binder and aggregates, for example bituminous concrete, gravel-asphalts, asphalt, or superficial coatings based on bitumen emulsion.
  • the hydrocarbon composition may further comprise additives, for example tackifiers or fibers (eg glass, cellulose or asbestos).
  • the hydrocarbon composition may further comprise recycled materials, such as roofing shingles, glass, concrete.
  • polymer preferably means a molecule formed by the covalent linking of a plurality of repeating units derived from one or more monomers (also referred to as units).
  • the surfactant is a cationic surfactant.
  • the compound comprises dispersants and hydrophobic agents.
  • the compound may be a steric or electrostatic dispersant.
  • the compound comprises polyacrylates, polymethacrylates, polymaleates and their copolymers, and lignosulfonates, polynaphthalene sulfonates and polymelamine sulfonates.
  • the polymers and copolymers can be modified to obtain hydrophobic side chains, for example lignosulfonates, polynaphthalene sulfonates and polymelamine sulfonates.
  • the compound comprises polydadmac (dadmac is a diallyl-dimethylammonium chloride), hydrophobic modified polydadmacs including a copolymer of dadmac with one or more hydrophobic chain monomers, acrylic polymers modified compounds comprising hydrophobic side chains, quaternized polyamines, linear or branched ethoxylated fatty alcohols, ammonium polyacrylates and a mixture thereof.
  • dadmac is a diallyl-dimethylammonium chloride
  • hydrophobic modified polydadmacs including a copolymer of dadmac with one or more hydrophobic chain monomers, acrylic polymers modified compounds comprising hydrophobic side chains, quaternized polyamines, linear or branched ethoxylated fatty alcohols, ammonium polyacrylates and a mixture thereof.
  • the compound comprises anionic, cationic or nonionic compounds.
  • the density of positive charges borne by the compound, or cationicity is preferably from 0.1 meq / g to 20 meq / g, more preferably greater than 0.5 meq / g, even more preferably greater than 1 meq / g, and in particular greater than 2 meq / g.
  • the charge density Negative values borne by the compound, or anionicity is preferably from 0.2 meq / g to 15 meq / g.
  • the compound also has a molecular weight expressed by an intrinsic viscosity of less than 1 dl / g, preferably less than 0.8 dl / g, and more preferably less than 0.6 dl / g. .
  • the intrinsic viscosity measurements can be carried out in a 3M NaCl solution, with a Ubbelhode capillary viscometer, at 25 ° C.
  • the flow time is measured in the capillary tube between two marks for the solvent and solutions of the compound at different concentrations.
  • the specific viscosity is obtained for each concentration, by dividing the difference between the flow times of the solution of the compound and the solvent, by the flow time of the solvent.
  • the reduced viscosity is calculated by dividing the specific viscosity by the concentration of the solution of the compound. By plotting the straight line of the reduced viscosity as a function of the concentration of the polymer solution, a straight line is obtained. The intersection with the ordinate of this line corresponds to the intrinsic viscosity for a concentration equal to zero.
  • the compound is a modified acrylic copolymer comprising hydrophobic side chains for example acrylic acid-butyl-styrene acrylate, acrylic acid-lauryl acrylate, acrylic acid-polyoxyethylenated alkyl acrylate.
  • the modified acrylic polymer has a molecular weight of 2000 to 100000 g / mol.
  • the polymer may be prepared by post-synthetic modification of an acrylic polymer, for example by grafting groups bearing one or more hydrophobic functions.
  • the compound is a quaternized polyamine, for example epichlorohydrin-dimethylamine polycondensate or polycondensate epichlorohydrin, dimethylamine, and an amine carrying an alkyl chain of 3 to 22 carbon atoms.
  • a quaternized polyamine for example epichlorohydrin-dimethylamine polycondensate or polycondensate epichlorohydrin, dimethylamine, and an amine carrying an alkyl chain of 3 to 22 carbon atoms.
  • This is, for example, a linear quaternized polyamine.
  • the compound is an ethoxylated branched long chain alcohol such as ethoxylated tridecyl alcohols.
  • the alcohol comprises a chain of more than 6 carbon atoms, preferably of more than 10 carbon atoms.
  • the compound is an ammonium polyacrylate.
  • the ammonium polyacrylate has a molecular weight of 1000 to 20000 g / mol.
  • the method comprises adding to the aggregates from 50 to 2000 ppm of the compound which is, preferably, a draining agent comprising an anionic polymer, a nonionic polymer, or a cationic polymer, with respect to the mass.
  • substantially dry granules preferably from 70 to 1500 ppm, more preferably from 100 to 1500 ppm, even more preferably from 150 ppm to 1000 ppm, in particular from 160 ppm to 1000 ppm.
  • the method comprises adding to the aggregates more than 100 ppm of the compound which is preferably a draining agent comprising an anionic polymer, a nonionic polymer or a cationic polymer with respect to the substantially dry mass of aggregates.
  • the process comprises adding to the aggregates from 200 to 2000 ppm of the compound which is preferably a surfactant (preferably an anionic or nonionic surfactant) relative to the substantially dry mass of aggregates, preferably from 220 to 1500 ppm, more preferably from 250 to 1500 ppm, still more preferably from 250 ppm to 1000 ppm, in particular from 250 ppm to 800 ppm.
  • the method comprises adding to the aggregates more than 250 ppm of the compound which is preferably a surfactant (preferably an anionic or nonionic surfactant), based on the substantially dry mass of aggregates.
  • the drainage method according to the invention is a drainage method by gravity, that is to say in which the water flows under its own weight.
  • the method does not include a step of draining the water from the aggregates by a mechanical action applied to the aggregates by a machine, for example by centrifuging the aggregates in a centrifuge.
  • the percentage of water drained from the aggregate cluster is greater than 20%, preferably greater than 25%, by weight relative to the mass of water initially contained in the cluster of aggregates 24 hours, preferably 12 hours, more preferably 6 hours, after the addition of the compound.
  • the cluster of aggregates comprises, after its formation, initially less than 40%, preferably less than 30%, more preferably less than 25% by weight of water relative to the substantially dry mass of the aggregate cluster.
  • the cluster of aggregates does not correspond to a suspension of particles, a paste of particles or a grout of particles.
  • the initial mass of the cluster of aggregates varies from 5 to 50,000 tons, preferably from 10 to 50,000 tons, more preferably from 20 to 50,000 tons, more preferably from 50 to 50,000 tons.
  • the compound used according to the invention may comprise a compound selected from polydadmac, modified polydadmac comprising hydrophobic chains, modified acrylic polymers comprising hydrophobic side chains, polyamines, branched ethoxylated fatty alcohols and polyacrylates.
  • the compound is a modified polydadmac with hydrophobic chains.
  • the compound is not a sulphosuccinate.
  • the compound is not sodium dioctyl sulfosuccinate
  • the compound is not an alkyl benzene sulphonate.
  • the compound is not sodium dodecylbenzene sulfonate.
  • the compound is not an alkyl phenol polyethylene glycol.
  • the compound is not a polyethylene glycol of nonylphenol, nor a mixture of polyethylene glycol of nonylphenol and polyethylene glycol of octylphenol.
  • the compound is not a block copolymer of ethylene oxide or propylene.
  • the compound is not a polyglycol diester.
  • the compound is not a polyoxyethylene glycol dioleate.
  • Aggregates comprise, relative to the substantially dry mass of aggregates, less than 20%, preferably less than 15%, more preferably less than 10%, for example less than 3%, by mass of particles having a mean size of less than 100 ⁇ .
  • the granulate is a sand, that is to say a granulate having an average size greater than 0 mm and less than or equal to 6 mm, preferably greater than 0 mm and less than 4 mm.
  • the sand may be of any mineral nature, for example limestone, siliceous, silico-limestone or other.
  • the aggregates comprise sand.
  • particle corresponds not only to compact particles having more or less a spherical shape but also to angular particles, flattened particles, flake-shaped particles, particles in the form of particles. fiber form, etc.
  • size of the particles in the context of the present invention means the smallest transverse dimension of the particles.
  • size of the particles corresponds to the diameter of the fibers.
  • particles of a material is meant particles taken individually (i.e. unitary elements of the material) knowing that the material may be in the form of agglomerates of particles.
  • average size is meant according to the present invention the particle size which is greater than the size of 50% by volume of the particles and smaller than the size of 50% by volume of the particles of a particle distribution. . This corresponds to the 50 th percentile (by volume).
  • the draining compound used according to the invention may be used according to the intended application, for example in the form of a draining composition in solid (for example granulated or bead), liquid or emulsion form comprising the compound. Preferably, it is in the form of an aqueous solution.
  • the dosage is particularly easy for liquid forms.
  • aqueous solutions at high concentrations, for example polymer without problems related to high viscosities. It is of particular interest to use concentrations, for example high polymer to reduce costs (eg transport and storage).
  • concentration of the compounds in the solution may vary, but is generally 20 to 80% by weight.
  • the draining composition comprises at least 50% by weight, preferably at least 70%, and more preferably from 70 to 80% by weight of the compound.
  • the composition may furthermore comprise other known additives, for example stabilizers.
  • the method may include a step of washing the aggregates.
  • the composition used according to the invention may be mixed with the washing water of the aggregates.
  • the composition used according to the invention can be sprayed on the aggregates, or the granules can be soaked in a solution comprising the compound.
  • the draining composition is sprayed on the aggregates.
  • the aggregates can be mixed during or after the treatment in order to ensure a good distribution of the composition and to obtain a homogeneously treated granulate.
  • the spraying can take place in a container, for example in a baffle box at the exit of a carpet. This embodiment further ensures a low loss of the product.
  • An alternative may be to spray a solution of the compound in a mixer placed at the outlet of a conveyor belt aggregates.
  • a premix can be prepared by mixing a small amount of aggregates with the composition. The premix can then be added to the rest of the aggregates.
  • the composition can be sprayed on the aggregates when passing or dropping a conveyor belt.
  • the method may comprise a fractionation step, particularly by screening or sieving, to separate at least a portion of the fine materials, for example clay, from at least a portion of the aggregates.
  • the present invention also relates to a method for manufacturing a hydraulic or hydrocarbon composition comprising the following steps:
  • the aggregates comprising, relative to the substantially dry mass of the aggregates, less than 20% by weight of particles having an average size less than 100 ⁇ ;
  • the initial mass of the cluster of aggregates after its formation being greater than 5 tons
  • the cluster of aggregates comprising, after its formation, initially less than 40% by weight of water relative to to the substantially dry mass of the aggregate cluster; -to allow water to flow from the pile;
  • the compound used as draining agent is not a foaming agent in water.
  • Aggregates treated according to the process of the invention may comprise the draining agent which can cause foaming or entrainment of air when the hydraulic compositions are mixed.
  • Particle size throughout the specification and claims are generally determined by screening or sieving.
  • the method uses a funnel plugged at the smallest end by a nylon screen.
  • the draining agent was mixed with water at a ratio of 1000 ppm based on the substantially dry mass of aggregates.
  • a quantity of 1 kilo of substantially dry granules was mixed with 20% by weight of the water comprising the draining agent relative to the mass of aggregates.
  • the mixture was made with a Perrier kneader at low speed for one minute.
  • the mixed granulates were placed in the funnel, the sieve being adapted to retain the sand and let the water flow.
  • the amount of water drained was measured as a function of time.
  • the percentage of water recovered was measured in relation to the mass of water (possibly including the treatment agent) initially added to the aggregates.
  • Treatment A The treatment of the aggregates was carried out with the product Alphenate TH 474 TM. It was a diisooctyl sodium sulphosuccinate (dry extract: 74%) marketed by Cognis.
  • Treatment B The treatment of aggregates was carried out with the product Lutensol AP 6 TM. It was an alkylphenol polyglycol ether (100%) marketed by BASF.
  • Treatment C the treatment of aggregates was carried out with the product DP / CR 2833 A TM. It was a hydrophobic modified polydadmac marketed by SNF.
  • Treatment D Aggregate treatment was carried out with the product
  • VB 5877 TM It was a hydrophobic chain modified acrylic polymer (dry extract: 30%) marketed by Coatex.
  • Treatment E the treatment of aggregates was carried out with the product DP FL2260 TM. It was a linear quarternized polyamine (dry extract: 60%) marketed by SNF.
  • Treatment F The treatment of aggregates was carried out with the product Lutensol T07 TM (100%). It was an ethoxylated branched C13 chain alcohol marketed by BASF.
  • Treatment G The treatment of aggregates was carried out with the product DP CR 2794 TM. It was a polycondensate of epichlorohydrin, dimethylamine, and an amine bearing a C3-C22 alkyl chain marketed by SNF.
  • Treatment I the treatment of aggregates was carried out with the product VB 5878-B TM. It was a modified acrylic polymer with ethoxylated alkyl chains (dry extract: 25.3%) marketed by Coatex.
  • Example 1 was made with 0/4 sand from the Moulin Neuf site in France. It was a siliceous sand. The method for measuring the percentage of salted water was used without treatment of aggregates and with the treatments of aggregates A to I described above.
  • FIG. 1 represented evolution curves of the percentage of water released for treatments A to I (curve S1 in the absence of sand treatment, curve A1 for treatment A, curve B1 for treatment B, curve C1 for treatment C, curve D1 for treatment D, curve E1 for treatment E, curve F1 for treatment F, curve G1 for treatment G, curve H 1 for treatment H and curve 11 for treatment I).
  • Example 2 was made with 0/4 sand from the La Calmette site in France. It was a limestone sand.
  • the method of measuring the percentage of salted water was used without treatment of the granulate and with the treatments of granulate A to H described above.
  • FIG. 2 represents evolution curves of the percentage of water released for treatments A to H (curve S2 in the absence of sand treatment, curve A2 for treatment A, curve B2 for treatment B, curve C2 for treatment C, curve D2 for treatment D, curve E2 for treatment E, curve F2 for treatment F, curve G2 for treatment G and curve H2 for treatment H).
  • Example 1 all drainage agents improved water removal from the aggregates.
  • Treatments C, D, F and H and others made it possible to obtain a removal of water of more than 20% compared to the mass of water added to the sand in less than 4 hours.
  • treatment C was particularly advantageous since its use resulted in the removal of more than 25% of the water mixed with the sands in less than four hours, regardless of the mineralogical nature, limestone or siliceous, sand.
  • the height and shape of the sand pile used in Examples 1 and 2 were substantially the same to allow comparison of results for both types of sand. It is understood that the rate of water released from a pile of sand will depend on a number of factors including the height and shape of the cluster.

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Abstract

The invention relates to a method for draining water from an aggregate cluster by means of gravity, the aggregate including, relative to the substantially dry weight of the aggregate, less than 20 wt % of particles having a size of less than 100 µm, the method including the following steps: placing the aggregate in contact with more than 50 ppm, relative to the substantially dry weight of aggregate, of a compound that is a draining agent and that includes an anionic polymer, a non-ionic polymer, a cationic polymer, a surface-active agent, or a mixture thereof, the compound(s) being water-soluble or dispersible in water at the concentration used; forming the aggregate cluster, the initial weight of the aggregate cluster after the formation thereof being greater than 5 tons, the aggregate cluster initially including, after the formation thereof, less than 40 wt % of water relative to the substantially dry weight of the aggregate cluster; and enabling the water to flow out of the cluster.

Description

PROCEDE DE DRAINAGE D'EAU D'UN AMAS DE GRANULATS  METHOD FOR DRAINING WATER FROM A PACKAGE OF GRANULATES

La présente invention se rapporte à un procédé pour accélérer et/ou augmenter le drainage d'un amas de granulats, notamment de sables. The present invention relates to a method for accelerating and / or increasing the drainage of a cluster of aggregates, especially sand.

Les granulats destinés à être utilisés dans des compositions hydrauliques ou hydrocarbonées sont généralement stockés avant utilisation sous la forme de tas ou d'amas de granulats. Ces amas peuvent comprendre une quantité importante d'eau, par exemple plus de 25 % en masse d'eau par rapport à la masse de l'amas de granulats, la quantité d'eau étant très variable et dépendant notamment de la durée de stockage de l'amas. Cette eau peut provenir du lieu d'extraction des granulats, du procédé d'extraction des granulats, d'une éventuelle opération de lavage des granulats ou des conditions atmosphériques. Dans la suite de la description, l'expression « eau stockée dans un amas de granulats » désigne seulement l'eau stockée en surface des grains et entre les grains de l'amas de granulats sans tenir compte de l'eau stockée dans les pores des granulats.  Aggregates for use in hydraulic or hydrocarbon compositions are generally stored prior to use in the form of heaps or aggregates. These clusters can comprise a large amount of water, for example more than 25% by weight of water relative to the mass of the cluster of aggregates, the amount of water being very variable and depending in particular on the storage duration of the cluster. This water may come from the aggregate extraction site, the aggregate extraction process, a possible aggregate washing operation or atmospheric conditions. In the remainder of the description, the term "water stored in a cluster of aggregates" refers only to the water stored on the surface of the grains and between the grains of the aggregate cluster without taking into account the water stored in the pores. aggregates.

Il est généralement souhaitable qu'au moins une partie de cette eau soit éliminée avant l'utilisation des granulats. En effet, les granulats sont généralement vendus au poids et les acquéreurs de granulats préfèrent que la quantité d'eau achetée soit la plus faible possible ou, au moins, soit sensiblement constante d'un lot de granulats à l'autre. Une quantité maximale d'eau présente dans les granulats est généralement prévue dans les conditions de vente de granulats. En outre, lorsque les granulats sont utilisés pour la réalisation d'une composition hydrocarbonée, les granulats doivent être séchés dans une étuve avant d'être mélangés aux autres constituants de la composition hydrocarbonée. Le coût de l'opération de séchage augmente lorsque la quantité d'eau contenue dans les granulats augmente.  It is generally desirable that at least a portion of this water be removed prior to the use of the aggregates. Indeed, aggregates are generally sold by weight and aggregates buyers prefer that the amount of water purchased is as low as possible or, at least, is substantially constant from one batch of aggregates to another. A maximum amount of water present in the aggregates is generally provided in the conditions of sale of aggregates. In addition, when the aggregates are used for the production of a hydrocarbon composition, the aggregates must be dried in an oven before being mixed with the other constituents of the hydrocarbon composition. The cost of the drying operation increases as the amount of water contained in the aggregates increases.

Un délai d'attente est donc prévu fréquemment entre la production et/ou le lavage des granulats et leur utilisation. Pendant ce délai, les granulats sont stockés afin qu'une partie de l'eau qu'ils contiennent soit évacuée par gravité ou évaporation. Toutefois, le stockage de grandes quantités de granulats représente un coût important. Les granulats peuvent être stockés sous un abri mais sont, pour réduire les frais de stockage, le plus souvent stockés en extérieur. Le séchage peut alors être au moins en partie inefficace si les conditions climatiques ne sont pas favorables. A waiting period is therefore frequently provided between the production and / or washing of the aggregates and their use. During this period, the aggregates are stored so that part of the water they contain is evacuated by gravity or evaporation. However, the storage of large quantities of aggregates represents a significant cost. Aggregates can be stored under a shelter but are, to reduce storage costs, most often stored outdoors. The drying can then at least partly ineffective if the weather conditions are not favorable.

L'eau contenue dans les granulats peut, au moins en partie, être récupérée par une action mécanique, par exemple par le passage des granulats dans une centrifugeuse. Toutefois, le coût de l'opération n'est généralement pas compatible avec le faible prix de vente des granulats.  The water contained in the aggregates can, at least in part, be recovered by a mechanical action, for example by the passage of aggregates in a centrifuge. However, the cost of the operation is generally not compatible with the low sales price of aggregates.

Le brevet US 6 797 180 décrit un procédé d'élimination d'au moins une partie de l'eau contenue dans un sable humide consistant à ajouter au sable un tensioactif anionique ou non ionique. Les produits testés dans le brevet US 6 797 180 sont énumérés ci-après : dioctyl sulfosuccinate de sodium, un polyéthylène nonylphénol, un mélange de polyéthylène nonylphénol et de polyéthylèneoxide ether d'octylphénol, le dodécylbenzène sulfonate de sodium, un polyoxyéthylène polyoxypropylène et un dioléate de polyoxyéthylène glycol. Les tests sont réalisés en plaçant le sable contenant l'eau et l'agent de traitement en centrifugeuse. Les seuls essais réalisés en l'absence de centrifugeuse utilisent le dioctyl sulfosuccinate de sodium et le mélange de polyéthylène nonylphénol et de polyéthylèneoxide ether d'octylphénol. Le processus d'élimination d'eau est suivi sur 15.4 jours pour un test et sur 10 jours pour un autre test.  US Patent 6,797,180 discloses a method of removing at least a portion of the water contained in a wet sand of adding to the sand an anionic or nonionic surfactant. The products tested in US Pat. No. 6,797,180 are listed below: sodium dioctyl sulphosuccinate, nonylphenol polyethylene, a mixture of nonylphenol polyethylene and octylphenol polyethyleneoxide ether, sodium dodecylbenzene sulphonate, polyoxyethylene polyoxypropylene and a dioleate of polyoxyethylene glycol. The tests are carried out by placing the sand containing the water and the treatment agent in a centrifuge. The only tests carried out in the absence of a centrifuge use sodium dioctyl sulfosuccinate and the mixture of polyethylene nonylphenol and polyethyleneoxide ether of octylphenol. The water removal process is followed for 15.4 days for one test and 10 days for another test.

La nature chimique du sable testé dans ce brevet US 6 797 180 n'est pas spécifié et, la présence et l'effet sur le drainage des petites particules dans le sable n'est pas décrite également : le sable a été obtenu d'une carrière de la Côte Est.  The chemical nature of the sand tested in this US Pat. No. 6,797,180 is not specified, and the presence and effect on the drainage of small particles in sand is not described as well: the sand was obtained from career of the East Coast.

Il serait souhaitable de réduire la quantité d'eau résiduelle dans un amas de granulats et la durée de stockage de granulats pour le séchage.  It would be desirable to reduce the amount of residual water in a cluster of aggregates and the storage time of aggregates for drying.

Aussi le problème que se propose de résoudre l'invention est de fournir un procédé de drainage d'eau de granulats humides en quelques heures.  Also the problem to be solved by the invention is to provide a wet aggregates water drainage process in a few hours.

Dans ce but, la présente invention se rapporte à un procédé de drainage d'eau par gravité d'un amas de granulats, les granulats comprenant, par rapport à la masse substantiellement sèche des granulats, moins de 20 % en masse de particules ayant une taille moyenne inférieure à 100 μηη, le procédé comprenant les étapes suivantes :  For this purpose, the present invention relates to a process for draining water by gravity from a cluster of aggregates, the aggregates comprising, with respect to the substantially dry mass of aggregates, less than 20% by weight of particles having a average size less than 100 μηη, the method comprising the following steps:

-mise en contact des granulats avec plus de 50 ppm par rapport à la masse substantiellement sèche de granulats d'un composé qui est un agent drainant comprenant un polymère anionique, un polymère non ionique, un polymère cationique, un tensioactif ou un mélange de ceux-ci, le ou les composés étant soluble dans l'eau ou dispersible dans l'eau à la concentration utilisée ; contacting the aggregates with more than 50 ppm relative to the substantially dry mass of aggregates of a compound which is a draining agent comprising an anionic polymer, a nonionic polymer, a cationic polymer, a surfactant or a mixture thereof, wherein the compound (s) is water soluble or dispersible in water at the concentration used;

-formation de l'amas de granulats, la masse initiale de l'amas de granulats après sa formation étant supérieure à 5 tonnes, l'amas de granulats comprenant, après sa formation, initialement moins de 40 %, préférentiellement moins de 30 %, plus préférentiellement moins de 20 %, par exemple moins de environ 15%, en masse d'eau par rapport à la masse substantiellement sèche de l'amas de granulats ; et  -formation of the cluster of aggregates, the initial mass of the cluster of aggregates after its formation being greater than 5 tons, the cluster of aggregates comprising, after its formation, initially less than 40%, preferably less than 30%, more preferably less than 20%, for example less than about 15%, by weight of water relative to the substantially dry mass of the aggregate cluster; and

-permettre à l'eau de s'écouler de l'amas.  -to allow the water to flow from the pile.

Le traitement d'un sable ayant une teneur réduite de particules avec une taille moyenne inférieure à 100 μηη permet d'obtenir un taux de drainage amélioré pour une concentration donnée de composé drainant comparativement à un sable pour lequel ces particules sont présentes.  The treatment of a sand having a reduced content of particles with an average size of less than 100 μηη makes it possible to obtain an improved drainage rate for a given concentration of draining compound compared to a sand for which these particles are present.

L'expression « substantiellement sèche» se réfère à des granulats pour lesquels l'eau stockée en surface des grains et entre les grains de l'amas de granulats a été substantiellement retirée.  The term "substantially dry" refers to aggregates for which the water stored at the surface of the grains and between the grains of the aggregate cluster has been substantially removed.

La présente invention se rapporte également à une composition hydraulique ou hydrocarbonée comprenant des granulats traités selon le procédé décrit précédemment.  The present invention also relates to a hydraulic or hydrocarbon composition comprising aggregates treated according to the method described above.

L'invention offre l'un ou plusieurs des avantages suivants :  The invention offers one or more of the following advantages:

-la durée de stockage des granulats pour les sécher est réduite ;  the storage duration of the aggregates for drying is reduced;

-pour la fabrication d'une composition hydrocarbonée, la quantité d'eau contenue dans les granulats est réduite, diminuant ainsi le coût de l'opération de séchage en étuve ou en four ;  for the manufacture of a hydrocarbon composition, the quantity of water contained in the aggregates is reduced, thus reducing the cost of the drying operation in an oven or in an oven;

-le procédé selon la présente invention n'entraîne pas de modification des méthodes de fabrication des compositions hydrauliques ou hydrocarbonées dans lesquelles les granulats sont ajoutés. En particulier, le composé utilisé selon l'invention n'a pas d'effet moussant substantielle dans la composition hydraulique ou hydrocarbonée ;  the process according to the present invention does not entail any modification of the methods of manufacture of the hydraulic or hydrocarbon compositions in which the aggregates are added. In particular, the compound used according to the invention has no substantial foaming effect in the hydraulic or hydrocarbon composition;

-le procédé selon l'invention n'a pas d'influence négative sur les propriétés d'usage des compositions hydrauliques et hydrocarbonées. En particulier, pour les compositions hydrauliques, la le composé utilisé selon l'invention ne perturbe pas significativement les résistances mécaniques à court terme ou à long terme de la composition hydraulique et ne présente pas d'effet retardateur significatif de prise ; et -au moins pour le polymère cationique sous forme liquide ayant une densité de charge supérieure ou égale à 0,5 meq/g et une viscosité intrinsèque de 0,01 à 0,8 dl/g utilisés selon la présente invention, l'adhérence entre les granulats traités et un liant hydrocarboné est améliorée ; et the process according to the invention has no negative influence on the properties of use of the hydraulic and hydrocarbon compositions. In particular, for In the case of hydraulic compositions, the compound used according to the invention does not significantly disturb the short-term or long-term mechanical strengths of the hydraulic composition and has no significant retarding effect; and at least for the cationic polymer in liquid form having a charge density greater than or equal to 0.5 meq / g and an intrinsic viscosity of 0.01 to 0.8 dl / g used according to the present invention, the adhesion between the treated granules and a hydrocarbon binder is improved; and

-les performances de drainage dues aux composés utilisés selon l'invention sont au moins partiellement indépendantes de la nature minéralogique, par exemple calcaire ou siliceuse, du granulat.  the drainage performance due to the compounds used according to the invention are at least partially independent of the mineralogical nature, for example limestone or siliceous, of the granulate.

Enfin l'invention a pour avantage de pouvoir être utilisée dans plusieurs industries, notamment l'industrie du bâtiment, l'industrie chimique (adjuvantiers) et l'ensemble des marchés de la construction et de l'étanchéité (bâtiment ou génie civil), de la route ou des bardeaux de toiture.  Finally, the invention has the advantage of being used in several industries, including the building industry, the chemical industry (adjuvants) and all construction and waterproofing markets (building or civil engineering), from the road or roof shingles.

L'expression « liant hydraulique », signifie de préférence un matériau pulvérulent qui, gâché avec de l'eau, forme une pâte qui fait prise et durcit par suite de réactions et de processus d'hydratation, et qui après durcissement, conserve sa résistance et sa stabilité même sous l'eau. Un exemple de liant hydraulique est le ciment, par exemple le ciment Portland.  The term "hydraulic binder" preferably means a powdery material which, when mixed with water, forms a paste which sets and hardens as a result of reactions and hydration processes, and which after curing retains its strength. and its stability even under water. An example of a hydraulic binder is cement, for example Portland cement.

L'expression « composition hydraulique » signifie de préférence un mélange d'un liant hydraulique, avec de l'eau, éventuellement des granulats, éventuellement des adjuvants conformément à la norme EN 934-2, et éventuellement des additions. L'expression « composition hydraulique », selon l'invention signifie de préférence une composition à l'état frais ou durci. La composition hydraulique selon l'invention signifie de préférence un coulis de ciment, un mortier ou un béton.  The expression "hydraulic composition" preferably means a mixture of a hydraulic binder, with water, optionally aggregates, optionally adjuvants according to EN 934-2, and optionally additions. The term "hydraulic composition" according to the invention preferably means a composition in the fresh or hardened state. The hydraulic composition according to the invention preferably means a cement slurry, a mortar or a concrete.

L'expression « liant hydrocarboné », signifie de préférence une substance comprenant un mélange d'hydrocarbures, très visqueuse voire solide à la température ambiante. Le liant hydrocarboné peut par exemple être du bitume naturel ou du bitume brut dérivé du pétrole (bitumes purs NF EN 12591 , bitumes spéciaux de grade « dur » NF EN 13924, etc.).  The term "hydrocarbon-based binder" preferably means a substance comprising a hydrocarbon mixture, which is highly viscous or even solid at ambient temperature. The hydrocarbon binder can for example be natural bitumen or crude bitumen derived from petroleum (pure bitumen NF EN 12591, special bitumen of "hard" grade NF EN 13924, etc.).

L'expression « composition hydrocarbonée », signifie de préférence une composition comprenant un liant hydrocarboné et des granulats, par exemple du béton bitumineux, des graves-bitumes, de l'asphalte, ou des enduits superficiels à base d'émulsion de bitume. La composition hydrocarbonée peut en outre comprendre des additifs, par exemple des dopes d'adhésivité ou des fibres (en verre, en cellulose ou en amiante, par exemple). La composition hydrocarbonée peut en outre comprendre des matériaux recyclés, comme par exemple des bardeaux de toiture, du verre, du béton. The expression "hydrocarbon composition" preferably means a composition comprising a hydrocarbon binder and aggregates, for example bituminous concrete, gravel-asphalts, asphalt, or superficial coatings based on bitumen emulsion. The hydrocarbon composition may further comprise additives, for example tackifiers or fibers (eg glass, cellulose or asbestos). The hydrocarbon composition may further comprise recycled materials, such as roofing shingles, glass, concrete.

L'expression « polymère », signifie de préférence une molécule formée de l'enchaînement covalent de plusieurs unités de répétition qui dérivent d'un ou de plusieurs monomères (également appelés motifs).  The term "polymer" preferably means a molecule formed by the covalent linking of a plurality of repeating units derived from one or more monomers (also referred to as units).

Selon un exemple de réalisation de l'invention, le tensioactif est un tensioactif cationique.  According to an exemplary embodiment of the invention, the surfactant is a cationic surfactant.

Selon un exemple de réalisation de l'invention, le composé comprend les dispersants et les agents hydrophobants. Le composé peut être un dispersant stérique ou électrostatique. A titre d'exemple, le composé comprend les polyacrylates, les polyméthacrylates, les polymaléates et leurs copolymères, et les lignosulfonates, les polynaphtalène sulfonates et les polymélamine sulfonates. Les polymères et les copolymères peuvent être modifiés pour obtenir des chaînes latérales hydrophobes, par exemple les lignosulfonates, les polynaphtalène sulfonates et les polymélamine sulfonates.  According to an exemplary embodiment of the invention, the compound comprises dispersants and hydrophobic agents. The compound may be a steric or electrostatic dispersant. By way of example, the compound comprises polyacrylates, polymethacrylates, polymaleates and their copolymers, and lignosulfonates, polynaphthalene sulfonates and polymelamine sulfonates. The polymers and copolymers can be modified to obtain hydrophobic side chains, for example lignosulfonates, polynaphthalene sulfonates and polymelamine sulfonates.

Selon un exemple de réalisation de l'invention, le composé comprend les polydadmac (le dadmac est un chlorure de diallyl-diméthyl-ammonium), les polydadmac modifiés hydrophobes notamment un copolymère du dadmac avec un ou plusieurs monomères à chaînes hydrophobes, les polymères acryliques modifiés comprenant des chaînes latérales hydrophobes, les polyamines quaternisées, les alcools gras linéaires ou ramifiés éthoxylés, les polyacrylates d'ammonium et un mélange de ceux-ci.  According to an exemplary embodiment of the invention, the compound comprises polydadmac (dadmac is a diallyl-dimethylammonium chloride), hydrophobic modified polydadmacs including a copolymer of dadmac with one or more hydrophobic chain monomers, acrylic polymers modified compounds comprising hydrophobic side chains, quaternized polyamines, linear or branched ethoxylated fatty alcohols, ammonium polyacrylates and a mixture thereof.

Le composé comprend les composés anionique, cationique ou non ionique. Lorsque l'agent drainant comprend un composé cationique, la densité de charges positives portées par le composé, ou cationicité, est de préférence de 0,1 meq/g à 20 meq/g, plus préférentiellement supérieure à 0,5 meq/g, encore plus préférentiellement supérieure à 1 meq/g, et en particulier supérieure à 2 meq/g. Lorsque l'agent drainant comprend un composé anionique, la densité de charges négatives portées par le composé, ou anionicité, est de préférence de 0,2 meq/g à 15 meq/g. The compound comprises anionic, cationic or nonionic compounds. When the draining agent comprises a cationic compound, the density of positive charges borne by the compound, or cationicity, is preferably from 0.1 meq / g to 20 meq / g, more preferably greater than 0.5 meq / g, even more preferably greater than 1 meq / g, and in particular greater than 2 meq / g. When the draining agent comprises an anionic compound, the charge density Negative values borne by the compound, or anionicity, is preferably from 0.2 meq / g to 15 meq / g.

Selon la présente invention, de préférence, le composé présente en outre un poids moléculaire exprimé par une viscosité intrinsèque inférieure à 1 dl/g, de préférence inférieure à 0,8 dl/g, et plus préférentiellement inférieure à 0,6 dl/g. Les mesures de viscosité intrinsèque peuvent être réalisées dans une solution NaCI 3 M, avec un viscosimètre capillaire de type Ubbelhode, à 25°C. Le temps d'écoulement est mesuré dans le tube capillaire entre deux repères pour le solvant et des solutions du composé à différentes concentrations. La viscosité spécifique est obtenue pour chaque concentration, en divisant la différence entre les temps d'écoulement de la solution du composé et du solvant, par le temps d'écoulement du solvant. La viscosité réduite est calculée en divisant la viscosité spécifique par la concentration de la solution du composé. En traçant la droite de la viscosité réduite en fonction de la concentration de la solution de polymère, une droite est obtenue. L'intersection avec l'ordonnée de cette droite correspond à la viscosité intrinsèque pour une concentration égale à zéro.  According to the present invention, preferably, the compound also has a molecular weight expressed by an intrinsic viscosity of less than 1 dl / g, preferably less than 0.8 dl / g, and more preferably less than 0.6 dl / g. . The intrinsic viscosity measurements can be carried out in a 3M NaCl solution, with a Ubbelhode capillary viscometer, at 25 ° C. The flow time is measured in the capillary tube between two marks for the solvent and solutions of the compound at different concentrations. The specific viscosity is obtained for each concentration, by dividing the difference between the flow times of the solution of the compound and the solvent, by the flow time of the solvent. The reduced viscosity is calculated by dividing the specific viscosity by the concentration of the solution of the compound. By plotting the straight line of the reduced viscosity as a function of the concentration of the polymer solution, a straight line is obtained. The intersection with the ordinate of this line corresponds to the intrinsic viscosity for a concentration equal to zero.

Selon un exemple de réalisation, le composé est un copolymère acrylique modifié comprenant des chaînes latérales hydrophobes par exemple acide acrylique- acrylate de butyl-styrène, acide acrylique-acrylate de lauryl, acide acrylique-acrylate d'alkyl polyoxyethyléné. A titre d'exemple, le polymère acrylique modifié présente un poids moléculaire de 2000 à 100000 g/mol. Le polymère peut être préparé par modification post-synthétique d'un polymère acrylique, par exemple par greffage de groupements portant une ou plusieurs fonctions hydrophobes.  According to an exemplary embodiment, the compound is a modified acrylic copolymer comprising hydrophobic side chains for example acrylic acid-butyl-styrene acrylate, acrylic acid-lauryl acrylate, acrylic acid-polyoxyethylenated alkyl acrylate. By way of example, the modified acrylic polymer has a molecular weight of 2000 to 100000 g / mol. The polymer may be prepared by post-synthetic modification of an acrylic polymer, for example by grafting groups bearing one or more hydrophobic functions.

Selon un exemple de réalisation, le composé est une polyamine quaternisée par exemple le polycondensat d'épichlorhydrine-diméthylamine ou le polycondensat d'épichlorhydrine, de diméthylamine, et d'une aminé portant une chaîne alkyle de 3 à 22 atomes de carbone. Il s'agit, par exemple, d'une polyamine quaternisée linéaire.  According to an exemplary embodiment, the compound is a quaternized polyamine, for example epichlorohydrin-dimethylamine polycondensate or polycondensate epichlorohydrin, dimethylamine, and an amine carrying an alkyl chain of 3 to 22 carbon atoms. This is, for example, a linear quaternized polyamine.

Selon un exemple de réalisation, le composé est un alcool à chaîne longue ramifié ethoxylé comme les alcools tridécyliques éthoxylés. A titre d'exemple, l'alcool comprend une chaîne de plus de 6 atomes de carbone, de préférence de plus de 10 atomes de carbone. Selon un exemple de réalisation, le composé est un polyacrylate d'ammonium. A titre d'exemple, le polyacrylate d'ammonium présente un poids moléculaire de 1000 à 20000 g/mol. According to an exemplary embodiment, the compound is an ethoxylated branched long chain alcohol such as ethoxylated tridecyl alcohols. By way of example, the alcohol comprises a chain of more than 6 carbon atoms, preferably of more than 10 carbon atoms. According to an exemplary embodiment, the compound is an ammonium polyacrylate. By way of example, the ammonium polyacrylate has a molecular weight of 1000 to 20000 g / mol.

Selon un exemple de réalisation, le procédé comprend l'ajout aux granulats de 50 à 2000 ppm du composé qui est, de préférence, un agent drainant comprenant un polymère anionique, un polymère non ionique, ou un polymère cationique, par rapport à la masse substantiellement sèche de granulats, de préférence de 70 à 1500 ppm, plus préférentiellement de 100 à 1500 ppm, encore plus préférentiellement de 150 ppm à 1000 ppm, en particulier de 160 ppm à 1000 ppm. De préférence, le procédé comprend l'ajout aux granulats de plus de 100 ppm du composé qui est, de préférence, un agent drainant comprenant un polymère anionique, un polymère non ionique ou un polymère cationique par rapport à la masse substantiellement sèche de granulats.  According to an exemplary embodiment, the method comprises adding to the aggregates from 50 to 2000 ppm of the compound which is, preferably, a draining agent comprising an anionic polymer, a nonionic polymer, or a cationic polymer, with respect to the mass. substantially dry granules, preferably from 70 to 1500 ppm, more preferably from 100 to 1500 ppm, even more preferably from 150 ppm to 1000 ppm, in particular from 160 ppm to 1000 ppm. Preferably, the method comprises adding to the aggregates more than 100 ppm of the compound which is preferably a draining agent comprising an anionic polymer, a nonionic polymer or a cationic polymer with respect to the substantially dry mass of aggregates.

Selon un exemple de réalisation, le procédé comprend l'ajout aux granulats de 200 à 2000 ppm du composé qui est, de préférence, un tensioactif (de préférence, un tensioactif anionique ou non ionique) par rapport à la masse substantiellement sèche de granulats, de préférence de 220 à 1500 ppm, plus préférentiellement de 250 à 1500 ppm, encore plus préférentiellement de 250 ppm à 1000 ppm, en particulier de 250 ppm à 800 ppm. De préférence, le procédé comprend l'ajout aux granulats de plus de 250 ppm du composé qui est, de préférence, un tensioactif (de préférence, un tensioactif anionique ou non ionique), par rapport à la masse substantiellement sèche de granulats. Le procédé de drainage selon l'invention est un procédé de drainage par gravité, c'est-à-dire dans lequel l'eau s'écoule sous son propre poids. De préférence, le procédé ne comprend pas d'étape de drainage de l'eau des granulats par une action mécanique appliquée aux granulats par une machine, par exemple par centrifugation des granulats dans une centrifugeuse.  According to an exemplary embodiment, the process comprises adding to the aggregates from 200 to 2000 ppm of the compound which is preferably a surfactant (preferably an anionic or nonionic surfactant) relative to the substantially dry mass of aggregates, preferably from 220 to 1500 ppm, more preferably from 250 to 1500 ppm, still more preferably from 250 ppm to 1000 ppm, in particular from 250 ppm to 800 ppm. Preferably, the method comprises adding to the aggregates more than 250 ppm of the compound which is preferably a surfactant (preferably an anionic or nonionic surfactant), based on the substantially dry mass of aggregates. The drainage method according to the invention is a drainage method by gravity, that is to say in which the water flows under its own weight. Preferably, the method does not include a step of draining the water from the aggregates by a mechanical action applied to the aggregates by a machine, for example by centrifuging the aggregates in a centrifuge.

De préférence, le pourcentage d'eau drainée de l'amas de granulats est supérieur à 20 %, de préférence supérieur à 25 %, en masse par rapport à la masse d'eau contenue initialement dans l'amas de granulats 24 heures, de préférence 12 heures, plus préférentiellement 6 heures, après l'ajout du composé. L'amas de granulats comprend, après sa formation, initialement moins de 40 %, de préférence moins de 30 %, plus préférentiellement moins de 25 %, en masse d'eau par rapport à la masse substantiellement sèche de l'amas de granulats. L'amas de granulats ne correspond donc pas à une suspension de particules, une pâte de particules ou un coulis de particules. Preferably, the percentage of water drained from the aggregate cluster is greater than 20%, preferably greater than 25%, by weight relative to the mass of water initially contained in the cluster of aggregates 24 hours, preferably 12 hours, more preferably 6 hours, after the addition of the compound. The cluster of aggregates comprises, after its formation, initially less than 40%, preferably less than 30%, more preferably less than 25% by weight of water relative to the substantially dry mass of the aggregate cluster. The cluster of aggregates does not correspond to a suspension of particles, a paste of particles or a grout of particles.

La masse initiale de l'amas de granulats varie de 5 à 50 000 tonnes, de préférence de 10 à 50 000 tonnes, plus préférentiellement de 20 à 50 000 tonnes, encore plus préférentiellement de 50 à 50 000 tonnes.  The initial mass of the cluster of aggregates varies from 5 to 50,000 tons, preferably from 10 to 50,000 tons, more preferably from 20 to 50,000 tons, more preferably from 50 to 50,000 tons.

Le composé utilisé selon l'invention peut comprendre un composé choisi parmi des polydadmac, des polydadmac modifiés comprenant des chaînes hydrophobes, des polymères acryliques modifiés comprenant des chaînes latérales hydrophobes, des polyamines, des alcools gras ramifiés éthoxylés et des polyacrylates. De préférence le composé est un polydadmac modifié avec des chaînes hydrophobes.  The compound used according to the invention may comprise a compound selected from polydadmac, modified polydadmac comprising hydrophobic chains, modified acrylic polymers comprising hydrophobic side chains, polyamines, branched ethoxylated fatty alcohols and polyacrylates. Preferably the compound is a modified polydadmac with hydrophobic chains.

Selon un exemple de réalisation, le composé n'est pas un sulfosuccinate. En particulier, le composé n'est pas le dioctyl sulfosuccinate de sodium  According to an exemplary embodiment, the compound is not a sulphosuccinate. In particular, the compound is not sodium dioctyl sulfosuccinate

Selon un exemple de réalisation, le composé n'est pas un alkyl benzène sulfonate. En particulier, le composé n'est pas le dodécylbenzène sulfonate de sodium.  According to an exemplary embodiment, the compound is not an alkyl benzene sulphonate. In particular, the compound is not sodium dodecylbenzene sulfonate.

Selon un exemple de réalisation, le composé n'est pas un polyéthylèneglycol d'alkyl phénol. En particulier, le composé n'est pas un polyéthylèneglycol de nonylphénol, ni un mélange de polyéthylèneglycol de nonyl phénol et de polyéthylèneglycol d'octylphénol.  According to an exemplary embodiment, the compound is not an alkyl phenol polyethylene glycol. In particular, the compound is not a polyethylene glycol of nonylphenol, nor a mixture of polyethylene glycol of nonylphenol and polyethylene glycol of octylphenol.

Selon un exemple de réalisation, le composé n'est pas un copolymère bloc d'oxyde d'éthylène ou de propylène.  According to an exemplary embodiment, the compound is not a block copolymer of ethylene oxide or propylene.

Selon un exemple de réalisation, le composé n'est pas un diester de polyglycol. En particulier, le composé n'est pas un dioléate de polyoxyéthylèneglycol.  According to an exemplary embodiment, the compound is not a polyglycol diester. In particular, the compound is not a polyoxyethylene glycol dioleate.

Les granulats comprennent, par rapport à la masse substantiellement sèche des granulats, moins de 20 %, de préférence moins de 15 %, plus préférentiellement moins de 10 %, par exemple moins de 3 %, en masse de particules ayant une taille moyenne inférieure à 100 μηη.  Aggregates comprise, relative to the substantially dry mass of aggregates, less than 20%, preferably less than 15%, more preferably less than 10%, for example less than 3%, by mass of particles having a mean size of less than 100 μηη.

De préférence, le granulat est un sable, c'est-à-dire un granulat ayant une taille moyenne supérieure à 0 mm et inférieure ou égale à 6 mm, de préférence supérieure à 0 mm et inférieure à 4 mm. Le sable peut être de toute nature minérale, par exemple calcaire, siliceuse, silico-calcaire ou autre. Preferably, the granulate is a sand, that is to say a granulate having an average size greater than 0 mm and less than or equal to 6 mm, preferably greater than 0 mm and less than 4 mm. The sand may be of any mineral nature, for example limestone, siliceous, silico-limestone or other.

Selon une variante de l'invention, les granulats comprennent du sable.  According to a variant of the invention, the aggregates comprise sand.

Le terme « particule » tel qu'utilisé dans le cadre de la présente invention correspond non seulement des particules compactes ayant plus ou moins une forme sphérique mais aussi à des particules anguleuses, des particules aplaties, des particules en forme de flocon, des particules en forme de fibres, etc. On comprendra que la « taille » des particules dans le cadre de la présente invention signifie la plus petite dimension transversale des particules. A titre d'exemple, dans le cas de particules en forme de fibres, la taille des particules correspond au diamètre des fibres. On entend par particules d'un matériau les particules prises individuellement (c'est-à-dire les éléments unitaires du matériau) sachant que le matériau peut se présenter sous la forme d'agglomérats de particules. Par le terme « taille moyenne », on entend selon la présente invention la taille de la particule qui est supérieure à la taille de 50 % en volume des particules et inférieure à la taille de 50 % en volume des particules d'une distribution de particules. Ceci correspond au 50eme centile (en volume). The term "particle" as used in the context of the present invention corresponds not only to compact particles having more or less a spherical shape but also to angular particles, flattened particles, flake-shaped particles, particles in the form of particles. fiber form, etc. It will be understood that the "size" of the particles in the context of the present invention means the smallest transverse dimension of the particles. For example, in the case of fiber-shaped particles, the size of the particles corresponds to the diameter of the fibers. By particles of a material is meant particles taken individually (i.e. unitary elements of the material) knowing that the material may be in the form of agglomerates of particles. By the term "average size" is meant according to the present invention the particle size which is greater than the size of 50% by volume of the particles and smaller than the size of 50% by volume of the particles of a particle distribution. . This corresponds to the 50 th percentile (by volume).

Le composé drainant utilisé selon l'invention peut être utilisée selon l'application envisagée, par exemple sous forme d'une composition drainante sous forme solide (par exemple granulé ou bille), liquide ou d'émulsion comprenant le composé. De préférence, elle se présente sous forme de solution aqueuse.  The draining compound used according to the invention may be used according to the intended application, for example in the form of a draining composition in solid (for example granulated or bead), liquid or emulsion form comprising the compound. Preferably, it is in the form of an aqueous solution.

Le dosage est particulièrement aisé pour des formes liquides. D'autre part, compte tenu du poids moléculaire, de préférence relativement faible des macromolécules sélectionnées, il est possible d'utiliser des solutions aqueuses à concentrations élevées, par exemple en polymère sans problème lié à de fortes viscosités. Il est particulièrement intéressant d'utiliser des concentrations, par exemple en polymère élevées pour réduire les coûts (par exemple de transport et stockage). La concentration des composés dans la solution peut varier, mais est généralement de 20 à 80 % en masse. Avantageusement, la composition drainante comprend au moins 50 % en masse, de préférence au moins 70 %, et plus préférentiellement de 70 à 80 % en masse du composé. La composition peut par ailleurs comprendre d'autres additifs connus, par exemple des stabilisants. Le procédé peut comprendre une étape de lavage des granulats. La composition utilisée selon l'invention peut être mélangée à l'eau de lavage des granulats. The dosage is particularly easy for liquid forms. On the other hand, given the molecular weight, preferably relatively small selected macromolecules, it is possible to use aqueous solutions at high concentrations, for example polymer without problems related to high viscosities. It is of particular interest to use concentrations, for example high polymer to reduce costs (eg transport and storage). The concentration of the compounds in the solution may vary, but is generally 20 to 80% by weight. Advantageously, the draining composition comprises at least 50% by weight, preferably at least 70%, and more preferably from 70 to 80% by weight of the compound. The composition may furthermore comprise other known additives, for example stabilizers. The method may include a step of washing the aggregates. The composition used according to the invention may be mixed with the washing water of the aggregates.

La composition utilisée selon l'invention peut être pulvérisée sur les granulats, ou les granulats peuvent être trempés dans une solution comprenant le composé. De préférence, la composition drainante est pulvérisée sur les granulats. Les granulats peuvent être mélangés pendant ou après le traitement afin d'assurer une bonne répartition de la composition et obtenir un granulat traité de manière homogène. La pulvérisation peut avoir lieu dans un récipient, par exemple dans une caisse à chicanes à la sortie d'un tapis. Ce mode de réalisation assure en outre une faible perte du produit. Une variante peut être de pulvériser une solution du composé dans un mélangeur placé en sortie d'une bande de transport des granulats. Un prémélange peut être préparé en mélangeant une petite quantité de granulats avec la composition. Le prémélange peut alors être ajouté au reste des granulats. La composition peut être pulvérisée sur les granulats au passage ou à la chute d'une bande transporteuse.  The composition used according to the invention can be sprayed on the aggregates, or the granules can be soaked in a solution comprising the compound. Preferably, the draining composition is sprayed on the aggregates. The aggregates can be mixed during or after the treatment in order to ensure a good distribution of the composition and to obtain a homogeneously treated granulate. The spraying can take place in a container, for example in a baffle box at the exit of a carpet. This embodiment further ensures a low loss of the product. An alternative may be to spray a solution of the compound in a mixer placed at the outlet of a conveyor belt aggregates. A premix can be prepared by mixing a small amount of aggregates with the composition. The premix can then be added to the rest of the aggregates. The composition can be sprayed on the aggregates when passing or dropping a conveyor belt.

Le procédé peut comprendre une étape de fractionnement, particulièrement par criblage ou tamisage, pour séparer au moins une partie des matières fines, par exemple argileuses, d'au moins une partie des granulats.  The method may comprise a fractionation step, particularly by screening or sieving, to separate at least a portion of the fine materials, for example clay, from at least a portion of the aggregates.

La présente invention se rapporte également à un procédé de fabrication d'une composition hydraulique ou hydrocarbonée comprenant les étapes suivantes: The present invention also relates to a method for manufacturing a hydraulic or hydrocarbon composition comprising the following steps:

-mise en contact des granulats avec plus de 50 ppm par rapport à la masse substantiellement sèche de granulats d'un composé qui est un agent drainant comprenant un polymère anionique, un polymère non ionique, un polymère cationique, un tensioactif ou un mélange de ceux-ci, le ou les composés étant soluble dans l'eau ou dispersible dans l'eau à la concentration utilisée, les granulats comprenant, par rapport à la masse substantiellement sèche des granulats, moins de 20 % en masse de particules ayant une taille moyenne inférieure à 100 μηη ; contacting the aggregates with more than 50 ppm with respect to the substantially dry mass of aggregates of a compound which is a draining agent comprising an anionic polymer, a nonionic polymer, a cationic polymer, a surfactant or a mixture of those the compound or compounds being soluble in water or dispersible in water at the concentration used, the aggregates comprising, relative to the substantially dry mass of the aggregates, less than 20% by weight of particles having an average size less than 100 μηη;

-formation de l'amas de granulats, la masse initiale de l'amas de granulats après sa formation étant supérieure à 5 tonnes, l'amas de granulats comprenant, après sa formation, initialement moins de 40 % en masse d'eau par rapport à la masse substantiellement sèche de l'amas de granulats ; -permettre à l'eau de s'écouler de l'amas ; et -formation of the cluster of aggregates, the initial mass of the cluster of aggregates after its formation being greater than 5 tons, the cluster of aggregates comprising, after its formation, initially less than 40% by weight of water relative to to the substantially dry mass of the aggregate cluster; -to allow water to flow from the pile; and

-mélange des granulats de l'amas de granulats avec un liant hydraulique ou hydrocarboné.  -mixing the aggregates of the aggregates cluster with a hydraulic or hydrocarbon binder.

Selon une variante préférée de l'invention, le composé utilisé comme agent drainant n'est pas un agent moussant dans l'eau. Les granulats traités selon le procédé de l'invention peuvent comprendre l'agent drainant qui peut provoquer un moussage ou un entraînement d'air lorsque les compositions hydrauliques sont mélangées.  According to a preferred variant of the invention, the compound used as draining agent is not a foaming agent in water. Aggregates treated according to the process of the invention may comprise the draining agent which can cause foaming or entrainment of air when the hydraulic compositions are mixed.

La taille des particules dans toute la description et les revendications sont généralement déterminées par criblage ou tamisage.  Particle size throughout the specification and claims are generally determined by screening or sieving.

Des exemples, illustrant l'invention sans en limiter la portée, vont être décrits en relation avec les figures suivantes parmi lesquelles les figures 1 et 2 représentent l'évolution en fonction du temps du pourcentage d'eau évacuée par des granulats pour différents traitements des granulats.  Examples, illustrating the invention without limiting its scope, will be described in relation to the following figures, among which Figures 1 and 2 show the evolution as a function of time of the percentage of water discharged by aggregates for different treatments of aggregates.

EXEMPLES EXAMPLES

Méthode de mesure du pourcentage d'eau relarguée par un granulat Method for measuring the percentage of water released by a granulate

La méthode utilise un entonnoir bouché à la plus petite extrémité par un tamis en nylon. L'agent drainant a été mélangée avec de l'eau avec une proportion de 1000 ppm par rapport à la masse substantiellement sèche de granulats.  The method uses a funnel plugged at the smallest end by a nylon screen. The draining agent was mixed with water at a ratio of 1000 ppm based on the substantially dry mass of aggregates.

Une quantité de 1 kilo de granulats substantiellement secs a été mélangée à 20 % en masse de l'eau comprenant l'agent drainant par rapport à la masse de granulats. Le mélange a été réalisé avec un malaxeur Perrier à petite vitesse pendant une minute. Les granulats mélangés ont été disposés dans l'entonnoir, le tamis étant adapté à retenir le sable et à laisser s'écouler l'eau. La quantité d'eau écoulée a été mesurée en fonction du temps. Le pourcentage d'eau récupérée a été mesuré par rapport à la masse d'eau (comprenant éventuellement l'agent de traitement) ajoutée initialement aux granulats.  A quantity of 1 kilo of substantially dry granules was mixed with 20% by weight of the water comprising the draining agent relative to the mass of aggregates. The mixture was made with a Perrier kneader at low speed for one minute. The mixed granulates were placed in the funnel, the sieve being adapted to retain the sand and let the water flow. The amount of water drained was measured as a function of time. The percentage of water recovered was measured in relation to the mass of water (possibly including the treatment agent) initially added to the aggregates.

Traitement des granulats Aggregates treatment

Les traitements A à I suivants ont été utilisés : Traitement A : le traitement des granulats a été réalisé avec le produit Alphenate TH 474™. Il s'agissait d'un diisooctyl sulfosuccinate de sodium (extrait sec : 74 %) commercialisé par la société Cognis. The following treatments A to I were used: Treatment A: The treatment of the aggregates was carried out with the product Alphenate TH 474 ™. It was a diisooctyl sodium sulphosuccinate (dry extract: 74%) marketed by Cognis.

Traitement B : le traitement des granulats a été réalisé avec le produit Lutensol AP 6™. Il s'agissait d'un polyglycoléther d'alkylphénol (100 %) commercialisé par la société BASF.  Treatment B: The treatment of aggregates was carried out with the product Lutensol AP 6 ™. It was an alkylphenol polyglycol ether (100%) marketed by BASF.

Traitement C : le traitement des granulats a été réalisé avec le produit DP/CR 2833 A™. Il s'agissait d'un polydadmac modifié hydrophobe commercialisé par la société SNF.  Treatment C: the treatment of aggregates was carried out with the product DP / CR 2833 A ™. It was a hydrophobic modified polydadmac marketed by SNF.

Traitement D : le traitement des granulats a été réalisé avec le produit Treatment D: Aggregate treatment was carried out with the product

VB 5877™. Il s'agissait d'un polymère acrylique modifié à chaînes hydrophobes (extrait sec : 30 %) commercialisé par la société Coatex. VB 5877 ™. It was a hydrophobic chain modified acrylic polymer (dry extract: 30%) marketed by Coatex.

Traitement E : le traitement des granulats a été réalisé avec le produit DP FL2260™. Il s'agissait d'une polyamine quarternisée linéaire (extrait sec : 60 %) commercialisée par la société SNF.  Treatment E: the treatment of aggregates was carried out with the product DP FL2260 ™. It was a linear quarternized polyamine (dry extract: 60%) marketed by SNF.

Traitement F : le traitement des granulats a été réalisé avec le produit Lutensol T07™ (100 %). Il s'agissait d'un alcool à chaîne en C13 ramifié éthoxylé commercialisé par la société BASF.  Treatment F: The treatment of aggregates was carried out with the product Lutensol T07 ™ (100%). It was an ethoxylated branched C13 chain alcohol marketed by BASF.

Traitement G : le traitement des granulats a été réalisé avec le produit DP CR 2794™. Il s'agissait d'un polycondensat d'épichlorhydrine, de diméthylamine, et d'une amine portant une chaîne alkyle de C3 à C22 commercialisé par la société SNF.  Treatment G: The treatment of aggregates was carried out with the product DP CR 2794 ™. It was a polycondensate of epichlorohydrin, dimethylamine, and an amine bearing a C3-C22 alkyl chain marketed by SNF.

Traitement H : le traitement des granulats a été réalisé avec le produit Ecodis P90™. Il s'agissait d'un sel de polyacrylate d'ammonium (extrait sec : 40 %) commercialisé par la société Coatex.  H treatment: Aggregates treatment was performed with Ecodis P90 ™. It was an ammonium polyacrylate salt (dry extract: 40%) marketed by Coatex.

Traitement I : le traitement des granulats a été réalisé avec le produit VB 5878-B™. Il s'agissait d'un polymère acrylique modifié à chaînes alkyl éthoxylées (extrait sec : 25,3 %) commercialisé par la société Coatex. EXEMPLE 1  Treatment I: the treatment of aggregates was carried out with the product VB 5878-B ™. It was a modified acrylic polymer with ethoxylated alkyl chains (dry extract: 25.3%) marketed by Coatex. EXAMPLE 1

L'exemple 1 a été réalisé avec du sable 0/4 provenant du site de Moulin Neuf en France. Il s'agissait d'un sable siliceux. La méthode de mesure du pourcentage d'eau relarguée a été utilisée sans traitement des granulats et avec les traitements des granulats A à I décrits précédemment. Example 1 was made with 0/4 sand from the Moulin Neuf site in France. It was a siliceous sand. The method for measuring the percentage of salted water was used without treatment of aggregates and with the treatments of aggregates A to I described above.

La figure 1 représentait des courbes d'évolution du pourcentage d'eau relarguée pour les traitements A à I (courbe S1 en l'absence de traitement du sable, courbe A1 pour le traitement A, courbe B1 pour le traitement B, courbe C1 pour le traitement C, courbe D1 pour le traitement D, courbe E1 pour le traitement E, courbe F1 pour le traitement F, courbe G1 pour le traitement G, courbe H 1 pour le traitement H et courbe 11 pour le traitement I).  FIG. 1 represented evolution curves of the percentage of water released for treatments A to I (curve S1 in the absence of sand treatment, curve A1 for treatment A, curve B1 for treatment B, curve C1 for treatment C, curve D1 for treatment D, curve E1 for treatment E, curve F1 for treatment F, curve G1 for treatment G, curve H 1 for treatment H and curve 11 for treatment I).

EXEMPLE 2 EXAMPLE 2

L'exemple 2 a été réalisé avec du sable 0/4 provenant du site de La Calmette en France. Il s'agissait d'un sable calcaire.  Example 2 was made with 0/4 sand from the La Calmette site in France. It was a limestone sand.

La méthode de mesure du pourcentage d'eau relarguée a été utilisée sans traitement du granulat et avec les traitements du granulat A à H décrits précédemment.  The method of measuring the percentage of salted water was used without treatment of the granulate and with the treatments of granulate A to H described above.

La figure 2 représentait des courbes d'évolution du pourcentage d'eau relarguée pour les traitements A à H (courbe S2 en l'absence de traitement du sable, courbe A2 pour le traitement A, courbe B2 pour le traitement B, courbe C2 pour le traitement C, courbe D2 pour le traitement D, courbe E2 pour le traitement E, courbe F2 pour le traitement F, courbe G2 pour le traitement G et courbe H2 pour le traitement H).  FIG. 2 represents evolution curves of the percentage of water released for treatments A to H (curve S2 in the absence of sand treatment, curve A2 for treatment A, curve B2 for treatment B, curve C2 for treatment C, curve D2 for treatment D, curve E2 for treatment E, curve F2 for treatment F, curve G2 for treatment G and curve H2 for treatment H).

Pour les exemples 1 et 2, en l'absence de traitement, seulement environ 10 % de l'eau contenue dans les sables siliceux ou calcaire a été évacuée.  For examples 1 and 2, in the absence of treatment, only about 10% of the water contained in the siliceous or limestone sands was removed.

Pour l'exemple 1 , l'ensemble des agents de drainage ont amélioré l'élimination d'eau des granulats. Les traitements C, D, F et H et autres (composé) ont permis d'obtenir une élimination de l'eau de plus de 20 % par rapport à la masse d'eau ajoutée au sable en moins de 4 heures.  For Example 1, all drainage agents improved water removal from the aggregates. Treatments C, D, F and H and others (compound) made it possible to obtain a removal of water of more than 20% compared to the mass of water added to the sand in less than 4 hours.

En comparant les exemples 1 et 2, le traitement C était particulièrement avantageux, puisque son utilisation a entraîné l'élimination de plus de 25 % de l'eau mélangée aux sables en moins de quatre heures, quelle qu'était la nature minéralogique, calcaire ou siliceuse, du sable. La hauteur et la forme de l'amas de sable utilisé dans les exemples 1 et 2 étaient substantiellement les mêmes pour permettre la comparaison des résultats pour les deux types de sable. Il est entendu que le taux d'eau relarguée à partir d'un amas de sable dépendra d'un certain nombre de facteurs comprenant la hauteur et la forme de l'amas. Comparing Examples 1 and 2, treatment C was particularly advantageous since its use resulted in the removal of more than 25% of the water mixed with the sands in less than four hours, regardless of the mineralogical nature, limestone or siliceous, sand. The height and shape of the sand pile used in Examples 1 and 2 were substantially the same to allow comparison of results for both types of sand. It is understood that the rate of water released from a pile of sand will depend on a number of factors including the height and shape of the cluster.

Claims

REVENDICATIONS Procédé de drainage d'eau par gravité d'un amas de granulats, les granulats comprenant, par rapport à la masse substantiellement sèche des granulats, moins de 20 % en masse de particules ayant une taille moyenne inférieure à 100 μηι, le procédé comprenant les étapes suivantes : A method of gravity-fed water drainage of a cluster of aggregates, the aggregates comprising, with respect to the substantially dry mass of the aggregates, less than 20% by weight of particles having an average size of less than 100 μm, the process comprising following steps : -mise en contact des granulats avec plus de 50 ppm par rapport à la masse substantiellement sèche de granulats d'un composé qui est un agent drainant comprenant un polymère anionique, un polymère non ionique, un polymère cationique, un tensioactif, ou un mélange de ceux-ci, le ou les composés étant soluble dans l'eau ou dispersible dans l'eau à la concentration utilisée ; contacting the aggregates with more than 50 ppm relative to the substantially dry mass of aggregates of a compound which is a draining agent comprising an anionic polymer, a nonionic polymer, a cationic polymer, a surfactant, or a mixture of these, the one or more compounds being soluble in water or dispersible in water at the concentration used; -formation de l'amas de granulats, la masse initiale de l'amas de granulats après sa formation étant supérieure à 5 tonnes, l'amas de granulats comprenant, après sa formation, initialement moins de 40 % en masse d'eau par rapport à la masse substantiellement sèche de l'amas de granulats ; et -permettre à l'eau de s'écouler de l'amas.  -formation of the cluster of aggregates, the initial mass of the cluster of aggregates after its formation being greater than 5 tons, the cluster of aggregates comprising, after its formation, initially less than 40% by weight of water relative to to the substantially dry mass of the aggregate cluster; and allow the water to flow from the pile. Procédé selon la revendication 1 , dans lequel le composé comprend les polydadmac, les polydadmac modifiés hydrophobes, les polymères acryliques modifiés comprenant des chaînes latérales hydrophobes, les polyamines quaternisées, les alcools gras linéraires ou ramifiés éthoxylés, les polyacrylates d'ammonium ou un mélange de ceux-ci. A process according to claim 1, wherein the compound comprises polydadmac, hydrophobic modified polydadmac, modified acrylic polymers comprising hydrophobic side chains, quaternized polyamines, linear or branched ethoxylated fatty alcohols, ammonium polyacrylates or a mixture of them. Procédé selon la revendication 1 ou 2, dans lequel le pourcentage d'eau drainée de l'amas de granulats 24 heures après l'ajout du composé est supérieur à au moins 20 % en masse par rapport à la masse d'eau initialement contenue dans l'amas de granulats. A process according to claim 1 or 2, wherein the percentage of water drained from the aggregates cluster 24 hours after the addition of the compound is greater than at least 20% by weight relative to the mass of water initially contained in the cluster of aggregates. Procédé selon l'une quelconque des revendications 1 à 3, dans lequel le composé drainant est utilisé sous forme d'une composition drainante pulvérisée sur les granulats. Procédé selon l'une quelconque des revendications 1 à 4, dans lequel le composé est un polydadmac modifié avec des chaînes hydrophobes. A method as claimed in any one of claims 1 to 3, wherein the draining compound is used in the form of a draining composition sprayed onto the aggregates. A process according to any one of claims 1 to 4 wherein the compound is a modified polydadmac with hydrophobic chains. Procédé selon l'une quelconque des revendications 1 à 5, comprenant l'ajout aux granulats de plus de 100 ppm de la composition par rapport à la masse de granulats. A method as claimed in any one of claims 1 to 5, comprising adding to the aggregates more than 100 ppm of the composition based on the mass of aggregates. Procédé selon l'une quelconque des revendications 1 à 6, dans lequel les granulats comprennent du sable. A method as claimed in any one of claims 1 to 6 wherein the aggregates comprise sand. Composition hydraulique ou hydrocarbonée, comprenant des granulats traités par le procédé selon l'une quelconque des revendications 1 à 7. A hydraulic or hydrocarbon composition comprising granulates treated by the process of any one of claims 1 to 7.
PCT/FR2011/052138 2010-09-16 2011-09-16 Method for draining water from an aggregate cluster Ceased WO2012035278A1 (en)

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FR1057397A FR2964883B1 (en) 2010-09-16 2010-09-16 METHOD FOR ACCELERATING AND / OR INCREASING WATER DRAINAGE FROM A PELLETS AMMUNATE

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993024798A1 (en) * 1992-06-01 1993-12-09 Henkel Kommanditgesellschaft Auf Aktien Process for dehydrating finely divided solid suspensions
EP0672620A1 (en) * 1994-03-10 1995-09-20 Cytec Technology Corp. Process for reducing the moisture content of alumina trihydrate
US5603841A (en) * 1995-10-31 1997-02-18 Nalco Chemical Company Hydrophobically-modified polymers for dewatering in mining processes
US6797180B2 (en) 2002-05-01 2004-09-28 Ge Betz, Inc. Dewatering sand with surfactants
US6855260B1 (en) * 1999-06-07 2005-02-15 Roe-Hoan Yoon Methods of enhancing fine particle dewatering

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993024798A1 (en) * 1992-06-01 1993-12-09 Henkel Kommanditgesellschaft Auf Aktien Process for dehydrating finely divided solid suspensions
EP0672620A1 (en) * 1994-03-10 1995-09-20 Cytec Technology Corp. Process for reducing the moisture content of alumina trihydrate
US5603841A (en) * 1995-10-31 1997-02-18 Nalco Chemical Company Hydrophobically-modified polymers for dewatering in mining processes
US6855260B1 (en) * 1999-06-07 2005-02-15 Roe-Hoan Yoon Methods of enhancing fine particle dewatering
US6797180B2 (en) 2002-05-01 2004-09-28 Ge Betz, Inc. Dewatering sand with surfactants

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