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WO2013084173A1 - Procédé intégré de recyclage de déchets de pierre et système associé - Google Patents

Procédé intégré de recyclage de déchets de pierre et système associé Download PDF

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Publication number
WO2013084173A1
WO2013084173A1 PCT/IB2012/057004 IB2012057004W WO2013084173A1 WO 2013084173 A1 WO2013084173 A1 WO 2013084173A1 IB 2012057004 W IB2012057004 W IB 2012057004W WO 2013084173 A1 WO2013084173 A1 WO 2013084173A1
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Prior art keywords
stone
wastes
treatment
recovery
content
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Inventor
Adriano SERENA
Andrea CANAL
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C1/00—Ingredients generally applicable to manufacture of glasses, glazes, or vitreous enamels
    • C03C1/02—Pretreated ingredients
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C1/00—Ingredients generally applicable to manufacture of glasses, glazes, or vitreous enamels
    • C03C1/002—Use of waste materials, e.g. slags
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C1/00—Ingredients generally applicable to manufacture of glasses, glazes, or vitreous enamels
    • C03C1/004—Refining agents
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
    • C03C3/083—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound
    • C03C3/085—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal
    • C03C3/087—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal containing calcium oxide, e.g. common sheet or container glass

Definitions

  • the present invention relates to the field of waste management and particularly to the methods and systems for recycling stone wastes, preferably those derived from aluminosilicate-type rocks.
  • the present invention relates to the field of waste management and particularly to the methods and systems for recycling stone wastes, preferably those derived from aluminosilicate-type rocks.
  • Stone wastes are produced during machining of natural stone (e.g. cutting, polishing) in the manufacturing of finished or semi-finished products in order to cover the market needs as described in the relative paragraph. Stone wastes represents a considerable environmental issue. According to the size, wastes from stone processing activities fall in three category. The first type, can have a size of several centimeters and comes from broken or defective slabs whose surface might be polished. Then, medium to small size waste consisting of splints, flakes, chips which are created during trimming of blocks or slabs falls in the second type. Finally, the third type consists of fine particles and has the form of dust or slurry. Since the third type of stone wastes is the most relevant for the present patent, more detail are provided in order to assess the background art.
  • Slurry is created from all stone cutting operations when the cooling water mixes with the fine stone particles. All processing operation like sawing and polishing are carried in wet conditions due to the equipment cooling and surface cleaning needs thus, large amounts of slurry are produced which is recycled in order to recover the water. Using press filters in appropriate installments, the water recovery can reach up to 90% still leaving a material called sludge with a high humidity content (22-28%).
  • the composition of slurry from stone processing activities depends on the raw material, on the type of machine tool used during processing, and on the abrading agents that are used which are required to process harder stones like granite or marble. For instance, the waste is constituted by calcium carbonate or silica aluminates if the original material is marble or granite, respectively.
  • calcareous sludge which contains a high percentage of calcium carbonate (over 90 % of dry contents), small amounts of silica and magnesium and other components (like iron, especially in colored marble).
  • the granite sludge contains high amounts of silica and insoluble residues (approximately 80 % of dry contents) and low amounts of calcium and magnesium.
  • a method for making basalt glass ceramic fibers is, for instance, disclosed in DE2938421.
  • the fibers can be used as reinforcing fibers for cement or concrete especially in the form of plates, tubes, crucibles etc. in place of toxic asbestos.
  • the fibers are less expensive than glass fibers and are resistant to alkalis and acids in glass compositions.
  • the disclosed method of production comprises treating a vitreous fiber in the temperature range of 900° to 1250 °C. Another method for manufacturing mineral fibers, was invented by Burger Gerhard et al. (WO1997013729).
  • the method permits production of fibers (especially endless fibers) of improved quality and textile processability from a stable melt produced from starting materials such as basalt rock, picture tube glass, fluorescent lamp glass, metallurgical slags, ashes and dusts.
  • a method for manufacturing endless fibers of igneous rock namely of the basalts was proposed also by Sisr Oldrich, et al. in the document CS19856161.
  • Sisr Oldrich, et al. finding a solution to the problem of recycling stone wastes.
  • fibers produced according to these patents are derived from natural rock specifically mined in quarry for this purpose, with a significant environmental impact and natural resource consumption.
  • the raw material is not a stonework nor stone wastes produced during machining of stonework as lining for kitchens or furniture.
  • these patents do not cover the production of glassware other than fibers, such as glassware or artistic glass.
  • stone slurry is a semi-liquid substance consisting of particles originated from the sawing and polishing processes and water used to cool and lubricate the sawing and polishing machines.
  • natural and artificial stone industry generates large volume of stone waste, this generates wastes cause environmental, health and economical drawbacks.
  • wastes from the processing of calcareous stone or granite stones were disposed in standard landfills without any treatment as they were considered an inert waste.
  • wastes produced by machining of stone materials are classified under the following codes: 01 04 07 (' waste containing dangerous substances from physical and chemical processing of nonmetalliferous minerals ') or 01 04 13 (' waste from stone cutting and sawing other than those mentioned in 01 04 07 ').
  • the stone sludge is collected and left to settle in tanks (thus obtaining a product with a high humidity content: approximately 80 %), then it is partly dehydrated and thickened by a filter press, thus producing the typical rectangular cake panels that still contain a high amount of humidity (approximately 20 % to 28 %), while the water, suitably purified and treated, flows back into the process.
  • Cakes are generally collected in specially designed polypropylene bags (named 'big bags') studied for the filling of special wastes in the form such as powders. The waste producer, under his own responsibility, decide the appropriate six-digit code of the waste. Wastes falling in the 01 04 07 category are considered 'hazardous waste' pursuant to Directive 91/689/EEC on hazardous waste, and subject to the provisions of that Directive which prescribes stringent requirements for transport and disposal which determine an increase of costs.
  • a first object of the present invention is to find a method which allows the maximum recovery of the wastes produced during machining of stone materials (hereinafter named Stone Wastes or SW) with a minimal environmental impact;
  • a further object of the present invention is to provide a process for the extraction of useful chemical compounds from Stone Wastes ( hereinafter named Wasted Recovered Compounds or WRC) , particularly from granite sludge;
  • a further object of the present invention is to provide a process for preparing a low-melting glass batch composition from granite sludge characterized in that it:
  • a further object of the present invention is to provide a suitable system for the achievement of a cost-effective and energy-effective recycling process of the SW which can be implemented with known technologies.
  • Wasted Recovered Compounds preferably a low-melting glass batch composition.
  • the method and system can provide ancillary and auxiliary Wasted Recovered Compounds which, depending on the composition of stone materials, preferably silicate or calcareous stone, include, but are not limited to, calcium nitrate, calcium chloride, calcium hydroxide, aluminium sulphate, metal particles and carbon dioxide.
  • the method and system allows for recycling Stone Wastes with a minimal environmental impact which limit landfill disposal.
  • the total recovery procedure of the WRC is obtained using a method according to claim 1 and a system according to claim 14.
  • a 'product by process' claim is provided (claim 11).
  • a use claim is also provided (claim 13). Further advantages are disclosed in the dependent claims.
  • the method provided by the present invention is characterized by the following steps:
  • SW Stone Wastes
  • SW are separated according to their origin (i.e. alumina-silicate or calcareous) and the kind of machining operation performed on the stone materials: 'primary machining' such as cutting of a stone block in a quarry, or 'secondary machining' such as polishing, chamfering during manufacturing of an end-item in a work-shop.
  • the sorting of the SW waste is performed by means of specially designed disposable polypropylene bags or by means of reusable containers, preferably partitioned containers, or collecting devices fixed to the machine tools.
  • said SW is in the form of mud with fine particle size and significant water content.
  • analytical tests performed on a WSS sample produced during the processing of a typical granite stone showed the following composition (% w/w dried basis): SiO2 (64.60%), Al2O3 (13.51 %), Fe2O3 (6.79%), CaO (5.37%), Na2O (4.08%), K2O (3.94%) and other constituents minority.
  • a second WSS sample produced during the processing of a typical calcareous stone showed the following composition (% w/w dried basis).
  • the place of disposal and treatment of the SW are located in the neighbouring of a quarry, stone workshops or a consortium of stonework manufacturer.
  • said treatment of the SW can be performed on site by means of a Mobile Recovery System, preferably a specially equipped vehicle or a transportable plant.
  • the Recovery Mobile System perform one or more of the following operations:
  • the Recovery Mobile System comprises at least two tanks: a process water tank and a tank for storing SW. When the process water tank is empty or cannot be used the Recovery Mobile System takes advantage of the process water instalment available by the stone workshop.
  • a process water tank When the process water tank is empty or cannot be used the Recovery Mobile System takes advantage of the process water instalment available by the stone workshop.
  • Each of the above-mentioned modes for invention can be implemented in separates module of the Mobile Recovery System. All the process steps of the method according to the present invention is advantageously managed by a unit processing controller installed in the Mobile Recovery System.
  • said Mobile Recovery System may be rendered substantially energy-autonomous, providing the system with suitable energy generators, preferably groups of co-generation energy capable of capturing the thermal energy produced in the treatment of these residues from exothermic chemical reactions and convert into electrical energy, for example by means of Stirling engines or Rankine cycle based on low-boiling fluids.
  • suitable energy generators preferably groups of co-generation energy capable of capturing the thermal energy produced in the treatment of these residues from exothermic chemical reactions and convert into electrical energy, for example by means of Stirling engines or Rankine cycle based on low-boiling fluids.
  • a plurality of sorted Stone Wastes (hereinafter also named as sorted-SW) is obtained and the subsequent step of the method, according to the present invention, is not required.
  • Each homogeneous fraction of said sorted-SW is therefore ready for the pre-treatment step. Otherwise, if at the end of this step an heterogeneous mixture of unsorted Stone Wastes (hereinafter also named as unsorted-SW) is collected, the following step of the method, according to the present invention, is required.
  • said unsorted SW (11) may be a mixture of alumina-silicate or calcareous materials. Typically, said mixture is in the form of mud with fine particle size and significant water content.
  • a separation process is required because many end-use applications (e.g. zootechny or paint industry) of the useful WRC chemical compounds extracted from the SW by the method according to the present invention, are sensitive to the presence of hydrocarbon contaminants and of metals.
  • the sorting of the SW waste can be achieved by means of
  • the distribution of the mean dimension of the particles in the SW depends on the chemical composition, hardness and abrasion resistance to machine tools.
  • a mixture comprising alumina-silicate and/or calcareous materials can be separated in two or more fractions each with selected concentrations (e.g. a feldspar-rich fraction).
  • concentrations e.g. a feldspar-rich fraction.
  • this can be achieved by means of a centrifugal separator, magnetic/gravimetric processing or flotation.
  • the Sorting of SW is performed by means of a module controlled by the unit processing controller of the Mobile Recovery System. At the end of the sorting step, a plurality of sorted SW ready for the subsequent pre-treatment stage is collected.
  • Stone Wastes contain a variable amount of metal particles which mainly are generated by the abrasion of the tools used during stone machining. Depending on the geologic origin of the stone metal particles or compounds may be also an intrinsically present in the stone composition. It is a primary object of the present invention to recovery such metal particles as they represent one specific Wasted Recovered Compound. With reference to the Figure 1 this purpose can be achieved by means of a wet drum magnetic separator, or using a roller system or permanent magnetic plates, or other technologies known in the art. In order to optimize the recovery of metal particles (32), w ater content (12) of the plurality of sorted SW is reduced or increased.
  • said sorted SW (11) is transferred into a tank in which magnetic plates, having a magnetic induction preferably of about 1200 Gauss, are immersed. Ferromagnetic materials, present in the fluid mass, are attracted by the magnetic plates and remained attached accordingly. Subsequently the magnetic plates are raised from the tanks by means of an automatic system and the ferromagnetic materials are them removed mechanically.
  • deferrized-SW By the process of deferrization (21) sorted SW (11) is thus divided into a metal-rich fraction (111) and a plurality of deferrized fluid SW (112) (hereinafter also named deferrized-SW.
  • deferrized-SW By selective screening (26) performed on the metal-rich fraction (111), the separation of the different granulometric metal particle fractions can be achieved.
  • the excess process water (12) used in this step is recovered, preferably by means of filter pressing, and pumped in the water recovery plant of the workshop or pumped in the tank of the Mobile Recovery for further treatments.
  • the deferrization step (21) is preferably performed where the SW are produced sand the SW (11) are still wet and the density can be easily corrected.
  • each homogeneous fraction of said plurality of deferrized SW (112) is in the form of a mud with fine particle size and significant water content.
  • a ccording to the present invention ( Figure 2) each homogeneous fraction of said deferrized SW is subjected to a pre-treatment comprises one or more of the following sub-steps depending on the specific composition and density of said fraction:
  • the excess process water (12) used in this step is recovered, preferably by means of filter pressing, and pumped in the water recovery plant of the workshop or pumped in the tank of the Mobile Recovery for further treatments.
  • a plurality of pretreated SW is produced. Each homogeneous fraction of said plurality of pretreated SW is ready for the extraction of useful Wasted Recovered Compounds (WRC) according to the following step .
  • the fluid containing a fraction of pretreated SW is transferred to a reactor vessel in such a way to extract one or more Wasted Recovered Compounds (WRC), and a non-recyclable bottom residue.
  • the reaction vessel is designed for acid mineralization (25) reactions between a strong acid and the pre-treated SW.
  • the heat released is collected by means of energy collecting systems known in the art and can be advantageously exploited in the steps of the method according to the present invention, for instance to drying the WRC extracted.
  • the remaining part of energy needed to feed the can be supplied both from traditional sources, preferably methane, or alternative sources, preferably solar thermal, geothermal sources or biomass.
  • traditional sources preferably methane, or alternative sources, preferably solar thermal, geothermal sources or biomass.
  • the optimal process condition are monitored by the unit processing controller of the Mobile Recovery System.
  • a non-recyclable residual body remain.
  • Such residual body is constituted mainly by minerals in the stone materials that are not soluble in an acid environment (e.g. chalk, quartz, silicates) and by the excess of the compounds needed to ensure complete neutralization of the free acid in the solution.
  • Floating compounds mainly constituted by polymeric materials used during stone machining (especially polishing), are also present in the mineralization solution. These material constituting said residual body can be separated from the mineralization solution after filtration and press-filtering by means of standard techniques.
  • the preferred method of disposal of said non-recyclable residual body is incineration, given the presence of a significant concentration of polymeric materials.
  • the absence of polymers or organic materials containing chlorine allow to treat these residues in any type of incinerator plant.
  • said bottom body can be disposed by landfilling (type 2A according to the abovementioned 'Landfilling Directive'), due to the presence of polymeric materials that classify said bottom body as a non-hazardous special waste. If the SW are produced only by cutting operations, and as such without residues of polymers, said residual body can be classified as inert material and disposed of as such by landfilling.
  • the mineralization solution separated from the non-recyclable residual body in the preceding step is preferably a solution of calcium nitrate or calcium chloride or aluminum sulfate.
  • the mineralization solution can be stored and/or be transferred to the vessel where the pre-treatment step occurs.
  • 1000 kg of SW derived from a typical marble produces a non-recyclable residual body having a dry mass of 6.2 kg,( 6.8 kg with 90% humidity, 8.1 kg with 70% humidity).
  • a dry mass of 6.2 kg,( 6.8 kg with 90% humidity, 8.1 kg with 70% humidity is achieved.
  • the method according to the best mode of the present invention can be advantageously employed to extract a low-melting glass batch composition from SW containing silica-alumina minerals.
  • composition melts in a standard furnace at a temperature (about 1100 °C) lower than the typical melting temperature (about 1350 °C) of standard silicate glassy materials. This effect allows for a significant energy-saving during melting and processing to a product of the glass batch composition.
  • said low-melting glass batch composition presents the following advantages with respect to the solutions know to the art:
  • the recovery also promotes reuse of the waste, in the form of by-products and reduce the exploitation of raw materials in accordance with the principle of prevention of waste production and the recovery of residues.
  • the method according to the present invention allows for recovery and reuse of Stone Wastes classified by the Environmental Protection Agency under 01 04 07 (' waste containing dangerous substances from physical and chemical processing of nonmetalliferous minerals ').
  • the method for the recycling of Stone Wastes (11), according to best mode of the present invention is advantageously employed for extracting a Wasted Recovered Compound (WRC) in the form of a low-melting glass batch composition (31) from Stone Wastes predominantly of a silica/alumina-type material (hereinafter also named 'silica-SW').
  • WRC Wasted Recovered Compound
  • a sample of silica-SW was processed according to the steps described before:
  • the pre-treatment step further comprises the following sub-steps:
  • chromophore compounds such as metal oxides
  • an homogeneous mixture i.e. pre-treated-SW
  • the WRC extraction from the pretreated-SW proceeds as follows.
  • the sample was derived from machining operations made on a typical granite stone. Elemental analysis by means of X-ray fluorescence spectrometry (according to the analytical method EPA 6200/98) revealed the composition shown in Example A of Table 1 (values in % w/w oxide equivalents.
  • Example A (%p/p)
  • ExampleB (%p/p) SiO 2 67.39 60.90 60.89 Al 2 O 3 14.07 10.68 11.31 CaO 5.62 9.81 9.38 K 2 O 4.11 4.37 4.43 Fe 2 O 3 2.91 1.97 1.11 Na 2 O 4.26 9.58 9.24 MgO 0.56 0.62 1.13 P 2 O 5 0.19 0.14 TiO 2 0.28 0.23 0.25 Sb 2 O 3 0.96 SO 3 0.14 - 0.77 As 2 O 3 - 0.86 MnO 0.06 0.28 Altri 0.36 0.46 0.63
  • the marked coloring presented by glassware manufactured with the low-melting glass batch composition (31), according to the best mode of the present invention, can be reduced by washing said composition with hydrochloric acid before the processes of filter-pressing and drying (282).
  • X-ray fluorescence spectrometry according to the analytical method EPA 6200/98 of the composition 'Example A', treated with hydrochloric acid, produced the rsults listed in the column 'Example B' (values expressed in % w/w, dry content oxides equivalents).
  • the method for the recycling of Stonework Wastes foresee several modes for invention which depends on the kind of Wasted Recovered Compound (WRC) that can extracted from said SW.
  • WRC Wasted Recovered Compound
  • Such WRC are determined by the mineral composition of the stone under machine processing, and the collecting and/or disposal stage in the SW management cycle. Consequently, by varying the above-described process step 'Treatment of the deferrized-SW', several modes for invention are disclosed as non-limiting examples, all falling wholly within the primary object of the present invention.
  • a first embodiment of the present invention is based on exothermic reactions as the followings:
  • the pre-treated SW reacts with an acid, preferably nitric acid or hydrochloric acid, in a suitable quantity that a person skilled in the art is able to evaluate.
  • an acid preferably nitric acid or hydrochloric acid
  • To the reaction mixture is also added a quantity of water sufficient to bring the concentration of the solution to a value immediately above the saturation threshold.
  • the solution of calcium nitrate (or calcium chloride) produced during the step of acid mineralization is transferred, after filtration, in a tank and then normalized by the addition of appropriate quantities of water. Through the process herein described it is possible to obtain any concentration ranging between 0 and 52%.
  • the solution of calcium nitrate (or calcium chloride) can then be filter-pressed and dried to obtain the corresponding salt.
  • the heat generated by the exothermic reactions can be collected by suitable known collection devices, and recovered to lower the energy impact of the method and system according to the present invention.
  • a second embodiment of the present invention is based on thermal decomposition of calcium carbonate contained in the deferrized SW to produce calcium oxide (causticlime), according to the following reaction:
  • the reduced grain size of the deferrized SW derived from calcareous stone wastes allows for a complete calcination in standard furnaces (at a temperature of about 800 °C) in a shorter time with respect to standard processes (i.e. calcination of calcareous not derived from SW) and consequently a considerable energy-saving can be achieved.
  • the gases and vapors produced during the calcination step, after separation by cyclone of any calcium oxide dragged from the vapors and gases have developed, are separated through a system of compressing and condensing, according to techniques well known to those skilled in the art.
  • the options for reuse of the WRC include industrial applications like cement production, paper production, glass production, the productive cycle of water paints, chemical industry, production of fertilizers and amendments for the agriculture, etc.
  • the pre-treated SW containing alumina- silica compounds, undertakes a treatment comprising filter-pressing, drying and grinding, according to usual techniques known to those skilled in the art.
  • the result of treatment is a mixture of silica-alumina that may find use in several applications.
  • a fourth embodiment of the present invention depicted in Fig. 4 and therein indicated by number (2), the extraction of aluminum sulfate from pre-treated SW, containing alumina- silica compounds, is achieved.
  • the reaction chamber (25) the alumina Al 2 O 3 present in the pre-treated SW reacts, at a suitable temperature, with a concentrated solution of sulfuric acid (22), according to the reaction:
  • demineralizing water sufficient to bring the concentration of the solution to a value immediately above the saturation threshold, is added to the reaction mixture.
  • the solution of aluminum sulfate produced during the step of acid mineralization is transferred, after filtration, in a tank and then normalized by the addition of appropriate quantities of water. Alternatively, the solution of aluminum sulfate can then be filter-pressed, dried and grinded to obtain the corresponding salt.
  • the method and system herein disclosed is able to implement an integrated management for the recycling of the Stone Wastes produced during machining of stone materials (Stone Wastes or SW), with minimal environmental impact, and the extraction of Wasted Recovered Compounds (WRC).
  • the low-melting glass batch composition according to the present invention is characterized by an high content of silica (provided that the proper Stone Waste is chosen) and it is suitable in the processing of glass fibers, concrete-glass bricks, cellular glass, art glass, specialty glasses for ash vitrification or for storing aggressive chemicals.
  • the glass batch composition presents chemical and physical features (high chemical resistance; decrease in the coefficient of thermal expansion and the tendency to devitrification; increase in the viscosity) which allows for the use for artistic glass manufacturing.

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Processing Of Solid Wastes (AREA)
  • Silicates, Zeolites, And Molecular Sieves (AREA)

Abstract

La présente invention concerne le domaine de la gestion des déchets et en particulier divulgue un procédé intégré et un système intégré pour le recyclage de déchets de pierre, préférentiellement du type aluminosilicate. Les déchets de pierre sont produits durant l'usinage de pierre naturelle (par exemple taille, polissage) dans la fabrication de produits finis ou semi-finis et représentent un problème environnemental considérable. En conséquence, l'invention concerne un procédé intégré d'extraction de composés chimiques utiles à partir de déchets de pierre de type aluminosilicate (par exemple un granit) ou de type calcaire (tel qu'un marbre). En particulier, la présente invention concerne une nouvelle composition de mélange de verre à bas point de fusion, issue de roches aluminosilicatées telles que le granit, le gneiss, la diorite et autres. La composition de mélange de verre à bas point de fusion est caractérisée par une utilisation réduite d'additifs fondants et stabilisants et pour ses propriétés physiques et chimiques et est particulièrement appropriée dans le traitement de verre artistique. Selon le procédé selon l'invention, le dépôt en décharges de déchets de pierre est évité ou du moins rendu minimal.
PCT/IB2012/057004 2011-12-06 2012-12-05 Procédé intégré de recyclage de déchets de pierre et système associé Ceased WO2013084173A1 (fr)

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IT000079A ITVE20110079A1 (it) 2011-12-06 2011-12-06 Composizione vetrificabile da residui di lavorazione dei materiali lapidei alluminosilicati e metodo per il riutilizzo di detti scarti

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104941774A (zh) * 2015-07-13 2015-09-30 黄顺昌 一种将废弃的花岗石料回收加工成瓷砖原料的方法
US9359244B2 (en) 2013-05-21 2016-06-07 Colorado School Of Mines Alumina-rich glasses and methods for making the same
CN109336379A (zh) * 2018-11-30 2019-02-15 湖北新华光信息材料有限公司 一种硫系玻璃废渣再利用方法及所得玻璃
US10507546B2 (en) 2017-03-16 2019-12-17 Xerox Corporation Laser cutting debris collection system

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DE2938421A1 (de) 1978-09-25 1980-04-03 Corning Glass Works Basaltkeramikfasern und verfahren zu ihrer herstellung
CS248881B1 (cs) * 1985-08-28 1987-02-12 Oldrich Sisr Nekonečná vlákna z vyvřelých hornin, zejména čedičů
WO1997013729A1 (fr) 1995-10-09 1997-04-17 Bürger, Gerhard Procede et dispositif de fabrication de fibres minerales
WO2006074946A2 (fr) * 2005-01-14 2006-07-20 Alkemy, Ltd. Agregats de synthese comprenant des boues d'epuration et d'autres dechets et procedes pour produire des agregats de ce type

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