WO2024172639A1 - Procédé de traitement de minerais de phosphates contenant des métaux lourds par flottation inverse - Google Patents
Procédé de traitement de minerais de phosphates contenant des métaux lourds par flottation inverse Download PDFInfo
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- WO2024172639A1 WO2024172639A1 PCT/MA2024/050004 MA2024050004W WO2024172639A1 WO 2024172639 A1 WO2024172639 A1 WO 2024172639A1 MA 2024050004 W MA2024050004 W MA 2024050004W WO 2024172639 A1 WO2024172639 A1 WO 2024172639A1
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- phosphate
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/001—Flotation agents
- B03D1/004—Organic compounds
- B03D1/008—Organic compounds containing oxygen
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/001—Flotation agents
- B03D1/004—Organic compounds
- B03D1/014—Organic compounds containing phosphorus
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/02—Froth-flotation processes
- B03D1/021—Froth-flotation processes for treatment of phosphate ores
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/001—Flotation agents
- B03D1/004—Organic compounds
- B03D1/0043—Organic compounds modified so as to contain a polyether group
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/001—Flotation agents
- B03D1/004—Organic compounds
- B03D1/012—Organic compounds containing sulfur
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D2201/00—Specified effects produced by the flotation agents
- B03D2201/02—Collectors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D2203/00—Specified materials treated by the flotation agents; Specified applications
- B03D2203/02—Ores
- B03D2203/04—Non-sulfide ores
- B03D2203/06—Phosphate ores
Definitions
- the present invention relates to a method for treating phosphate ores containing heavy metals by reverse flotation in which a monophosphoric ester is used as a collector for the flotation of carbonates.
- the method according to the invention makes it possible to reduce the heavy metal content of phosphate ores.
- phosphates Global consumption of phosphates, mainly for the production of phosphoric acid and fertilizers (95%), exceeded 47 million tonnes in 2019 and is expected to reach more than 50 million tonnes in 2023 (USGS).
- Phosphates are produced by mining phosphoric rocks collected from marine sediment deposits (75%), igneous and metamorphic deposits (15 to 20%) or biogenetic deposits (2 to 3%).
- the main source of phosphates comes from calcium phosphate from apatite ores (Ca 5 (PO 4 ) 3) (F, Cl, OH), whose global reserves are mainly present in North Africa (Morocco), the United States (Florida), Russia and China. These ores represent approximately 80% of the total global production of phosphate rocks and generally contain between 18% and 35% P 2 O 5 .
- apatites in these ores are Francolite or Collophane, which contain in addition to calcium phosphate variable amounts of carbonates (such as calcite, dolomite or magnesite), silicates, clays (illite, kaolinite, smectite, etc.) or even organic residues.
- carbonates such as calcite, dolomite or magnesite
- silicates such as silicates
- clays illite, kaolinite, smectite, etc.
- Phosphate ore processing techniques depend mainly on the type of associated gangue minerals present in the mined rock.
- the historical beneficiation method for half a century has been the froth flotation technique.
- Sedimentary phosphate ore may contain either carbonate gangue or siliceous and/or silico-carbonate gangue.
- Silica and phosphates have significantly different physicochemical properties and can be easily separated by flotation.
- carbonates and phosphates have similar physicochemical properties and behave in the same way during flotation operations; they are both found either as floated or as depressed products.
- the ore is first crushed and suspended in water. Then, the collector is added, often in combination with other additives, such as frothers, pH regulators, dispersants, depressants and/or stimulants (activators), to separate the valuable minerals from the gangue minerals of the ore. After a certain conditioning time, the flotation process then begins and consists of blowing air into the suspension to disintegrate the fine ore particles and produce froth on the surface.
- additives such as frothers, pH regulators, dispersants, depressants and/or stimulants (activators)
- the flotation process then begins and consists of blowing air into the suspension to disintegrate the fine ore particles and produce froth on the surface.
- Three types of phosphate flotation processes have been developed in the industry to valorize the ores: direct flotation, reverse flotation and the Crago process. In a direct flotation process, the collector makes the surface of the minerals more hydrophobic, while the hydrophilic gangue minerals do not adhere to the gas bubbles and remain
- the froth from the mineral collector is then removed and treated.
- a reverse flotation process the valuable minerals in the ore remain in solution and the gangues are carried away in the froth, which is then removed.
- the Crago process uses coarse flotation with fatty acids followed by flotation by deoiling and cleaning with amines.
- Fatty acid-based collector systems are generally used to increase the hydrophobicity differences between the material to be retained and the material to be removed.
- the main primary collectors are based on partially unsaturated fatty acids (C12-C18), which are used at pH 4-5, with phosphoric acid as a depressant. Since fatty acids are poorly soluble in water at this pH, secondary collectors, usually anionic or nonionic surfactants, are used to improve selectivity and recovery.
- Application WO2018197476 thus describes a mixture of unsaturated fatty acids, pegylated alcohol and a sulfide-based surfactant used at a dose of 500g/t and in a pH range of 4.9 to 5.2.
- a mixture of a fatty acid and an aromatic sulfonic acid used at a dose of 806g/t and in a pH range of 5.0 to 5.2 is described in application WO210162344.
- US 8,657,118B2 describes a reverse flotation process using mixtures of phosphoric monoester and phosphoric diester at contents of 340g/t and 500g/tonnes in order to enrich ores in P 2 O 5 .
- Prior art reverse flotation processes have many drawbacks. They may involve the use of foaming agents, pH regulating agents or activating agents. In particular, these processes require high quantities of collectors, and involve working in an acidic pH range.
- the ores to be processed may contain elements that can pollute the soil or water tables, such as cadmium (Cd), copper (Cu), arsenic (As), lead (Pb), nickel (Ni) or even chromium (Cr).
- elements that can pollute the soil or water tables such as cadmium (Cd), copper (Cu), arsenic (As), lead (Pb), nickel (Ni) or even chromium (Cr).
- Cadmium levels in fertilizers are closely monitored by the European Parliament and other institutions, which require limits on cadmium in phosphate fertilizers. Hence the interest in reducing the concentration of Cd but also of other heavy metals, such as arsenic.
- Calcite increases sulfuric acid consumption in the manufacture of phosphoric acid and fertilizers, and significant levels of toxic impurities have been identified in dolomite ores. Therefore, despite several advances in recent years to address these issues, improvements are still needed in the phosphoric rock flotation process.
- the present invention relates to a method for treating phosphate ores containing heavy metals by reverse flotation, the method comprising the following steps:
- R 1 is a hydrocarbon chain, linear or branched, saturated or not, comprising 6 to 10 carbon atoms, preferably an alkyl group,
- R 2 is a hydrocarbon chain, linear or branched, saturated or not, comprising 6 to 18 carbon atoms, preferably an alkyl group, different from the R 1 group of the monophosphoric ester A of formula (I),
- the present invention also relates to the use of such a monophosphoric ester A, alone or in combination with compound B as described herein, for the treatment of phosphate ores containing heavy metals.
- the inventors have developed a process that meets the expressed needs.
- the proposed process does not have the drawbacks of the prior art. It makes it possible to increase the P 2 O 5 content of the ore by using a smaller quantity of collector. It also makes it possible to reduce the heavy metal content of the ore, in particular cadmium and arsenic.
- the invention relates to a method for treating phosphate ores containing heavy metals by reverse flotation, the method comprising the following steps:
- R 1 is a hydrocarbon chain, linear or branched, saturated or not, comprising 6 to 10 carbon atoms, preferably an alkyl group,
- R 2 is a hydrocarbon chain, linear or branched, saturated or not, comprising 6 to 18 carbon atoms, preferably an alkyl group, different from the R 1 group of the monophosphoric ester A of formula (I),
- the treatment method according to the invention makes it possible to reduce the content of heavy metals present in phosphate ores such as Cadmium, Arsenic, Lead, Nickel, Chromium, Copper and Zinc, in particular Cadmium and Arsenic.
- heavy metals present in phosphate ores such as Cadmium, Arsenic, Lead, Nickel, Chromium, Copper and Zinc, in particular Cadmium and Arsenic.
- the method according to the invention can make it possible to eliminate at least 60% by weight of the heavy metals present in the phosphate ore.
- at least 70% by weight of the heavy metals are eliminated, particularly advantageously at least 80% of the heavy metals are eliminated.
- Step (i) comprises the addition to an aqueous suspension of phosphate ore of a monophosphoric ester A of formula (I):
- R 1 is a hydrocarbon chain, linear or branched, saturated or not, comprising 6 to 10 carbon atoms, preferably an alkyl group,
- R 2 is a hydrocarbon chain, linear or branched, saturated or not, comprising 6 to 18 carbon atoms, preferably 6 to 10 carbon atoms, preferentially an alkyl group, different from the R 1 group of the monophosphoric ester A of formula (I),
- Phosphate ore also called “phosphate rocks”, refers to an exogenous rock containing phosphate.
- the phosphate ore useful in the present invention can be taken from the Khouribga site (Bni-Amir), Morocco.
- phosphate ore has a P2O5 content ranging from 18 to 35%, by weight, relative to the total weight of the phosphate ore.
- the aqueous suspension is typically prepared by mixing phosphate ore with water.
- the phosphate ore is in the form of particles.
- the ore particles have a size ranging from 40 ⁇ m to 125 ⁇ m, or from 40 ⁇ m to 160 ⁇ m.
- the particle size is determined by sieving.
- the phosphate ore is typically previously crushed and sized.
- the mass percentage of phosphate ore in the aqueous suspension, also called pulp, typically varies from 10% to 30%, preferably from 10% to 20%, the percentage being expressed as % by weight relative to the total weight of the phosphate ore suspension.
- the “collector” has the ability to adsorb on the surface of the carbonate particles present in the phosphate ore, then allowing their separation and elimination during subsequent stages of the process.
- the "collector” will also form a complex with the heavy metals present in the ore, said complex then being at least partly eliminated during the subsequent stages of the process.
- hydrocarbon chain preferably of the alkyl group, in particular the length of the hydrocarbon chain, preferably of the alkyl chain and the presence of branches, can influence the ability of the monophosphoric ester to interact with the carbonates and heavy metals present in the phosphate ore.
- the R 1 group of the monophosphoric ester A of formula (I) is a linear or branched, saturated or unsaturated hydrocarbon chain comprising 6 to 10 carbon atoms, preferably an alkyl group.
- the R 1 group of the monophosphoric ester A of formula (I) is a linear alkyl group comprising 6 to 10 carbon atoms, preferably 7 to 10 carbon atoms, preferably 8 to 9 carbon atoms, particularly preferably comprising 8 carbon atoms.
- the R 1 group of the monophosphoric ester A of formula (I) is a branched alkyl group comprising 6 to 10 carbon atoms, preferably 8 to 9 carbon atoms.
- Preferred branched R 1 groups include 2-ethylhexyl, 2-4-4 trimethylpentyl and 3-5-5 trimethylhexyl.
- the R 1 group of the monophosphoric ester A of formula (I) is a linear alkyl group comprising 8 or 9 carbon atoms or a branched alkyl group comprising 8 or 9 carbon atoms.
- the collector is comprised of the monophosphoric ester A of formula (I) as described above.
- the presence of branches on the hydrocarbon chain, preferentially of the alkyl group, of the R 1 group of the monophosphoric ester A can then make it possible to minimize the quantity of foam (also called float) which is eliminated during step (iv) of the process while making it possible to enrich the ore in P 2 O 5 and to eliminate heavy metals.
- the combination of monophosphoric ester A and compound B can also have an influence on the amount of foam formed and the enrichment of the ore in P 2 O 5 .
- compound B When compound B is present, it is selected from the group consisting of:
- R 2 is a hydrocarbon chain, linear or branched, saturated or not, having from 6 to 18 carbon atoms, preferably from 6 to 10 carbon atoms, preferentially an alkyl group, different from the R 1 group of the monophosphoric ester A of formula (I) as described above,
- the combination of monophosphoric ester A and compound B can minimize the amount of froth (float) that is removed in step (iv) of the process while allowing the ore to be enriched in P 2 O 5 and heavy metals to be removed, compared to the use of monophosphoric ester A alone.
- the cost price of the composition comprising monophosphoric ester A and compound B can also be reduced.
- compound B is a monophosphoric ester of formula (II):
- the group R 2 is a hydrocarbon chain, linear or branched, saturated or not comprising 6 to 18 carbon atoms, preferably from 6 to 14 carbon atoms, particularly preferably from 6 to 10 carbon atoms, preferably an alkyl group.
- the R 1 group of the monophosphoric ester A of formula (I) is a linear alkyl group comprising 6 to 10 carbon atoms and the R 2 group of the monophosphoric ester B of formula (II), different from R 1 , is a linear or branched, saturated or unsaturated hydrocarbon chain comprising 6 to 10 carbon atoms, preferably a linear alkyl group comprising 6 to 10 carbon atoms.
- the R 1 group of the monophosphoric ester A of formula (I) is a linear alkyl group comprising 6 to 10 carbon atoms and the R 2 group of the monophosphoric ester B of formula (II), different from R 1 , is a branched alkyl group comprising 6 to 10 carbon atoms.
- the R 1 group of the monophosphoric ester A of formula (I) is a linear alkyl group comprising 7 to 10 carbon atoms, preferably 8 to 9 carbon atoms, particularly preferably comprising 8 carbon atoms and the R 2 group of the monophosphoric ester B of formula (II), different from R1, is a branched alkyl group comprising 8 or 9 carbon atoms.
- a synergistic effect linked to the combination of the two monophosphoric esters can be observed, in particular concerning the enrichment of the ore in P 2 O 5 .
- compound B is an alcohol of formula R 3 -OH (III), R 3 being a linear or branched, saturated or unsaturated hydrocarbon chain comprising 2 to 20 carbon atoms, preferably 6 to 10 carbon atoms, particularly preferably 8 to 10 carbon atoms, preferably an alkyl group.
- the R 1 group of the monophosphoric ester A of formula (I) is a linear alkyl group comprising 7 to 10 carbon atoms, preferably 8 to 9 carbon atoms, particularly preferably comprising 8 carbon atoms and the R 3 group of the alcohol of formula (III) is a linear alkyl group comprising 6 to 10 carbon atoms, preferably 8 to 10 carbon atoms.
- the mass percentage of alcohol is less than 70%, preferably less than 50%, preferably less than 40%, preferably less than 30% relative to the mass of the monophosphoric ester A and the alcohol.
- compound B is a salt of a sulfonic acid with a hydrocarbon chain, or a salt of an aromatic sulfonic acid substituted by a hydrocarbon chain, the hydrocarbon chain being linear or branched, saturated or not comprising 2 to 20 carbon atoms, preferably an alkyl group.
- compound B is a salt of an alkylated aromatic sulfonic acid, the alkyl group being linear and comprising 10 to 14 carbon atoms, the sodium salt of dodecyl benzene sulfonic acid being particularly preferred.
- Compound B may be a sulfate with a linear or branched, saturated or unsaturated hydrocarbon chain comprising 2 to 20 carbon atoms, preferably an alkyl sulfate.
- the alkyl group is linear and comprises 10 to 14 carbon atoms, sodium dodecyl sulfate being particularly preferred.
- the R 1 group of the monophosphoric ester A of formula (I) is a linear alkyl group comprising 7 to 10 carbon atoms, preferably 8 to 9 carbon atoms, particularly preferably comprising 8 carbon atoms and the compound B is a salt of an alkylated aromatic sulfonic acid, the alkyl group being linear and comprising 10 to 14 carbon atoms.
- the R 1 group of the monophosphoric ester A of formula (I) is a linear alkyl group comprising 7 to 10 carbon atoms, preferably 8 to 9 carbon atoms, particularly preferably comprising 8 carbon atoms and the compound B is an alkyl sulfate, the alkyl group being linear and comprising 10 to 14 carbon atoms.
- the mass percentage of the alkylated sulfonic acid salt or the alkylated aromatic sulfonic acid salt is less than or equal to 40% relative to the mass of the monophosphoric ester A and the alkylated sulfonic acid salt or the alkylated aromatic sulfonic acid salt.
- the mass percentage of the alkyl sulfate is less than 70%, preferably less than 50%, preferably 40%, preferably 30%, preferably 20% relative to the mass of the monophosphoric ester A and the alkyl sulfate.
- compound B is an ether, pegylated or not, of formula R 5 -(OC 2 H 4 ) n OR 6 (IV) with R 5 being an alkyl or aromatic or alkylated aromatic group and R 6 being an alkyl group or a hydrogen atom and n represents an integer ranging from 0 to 10.
- alkylated aromatic means an aromatic group substituted by a linear or branched alkyl group comprising from 2 to 20 carbon atoms.
- R 5 is an alkylated aromatic group
- R 6 is a hydrogen atom
- n is other than zero.
- R 5 is an aromatic group substituted by a branched alkyl group carrying 6 to 10 carbon atoms
- R 6 is a hydrogen atom and n is other than zero.
- compound B is an ether, pegylated or not, of formula R 5 -(OC 2 H 4 ) n OR 6 (IV) with R 5 being an unsaturated hydrocarbon chain or an aromatic group substituted by an unsaturated hydrocarbon chain and R 6 being an unsaturated hydrocarbon chain or a hydrogen atom and n represents an integer ranging from 0 to 10.
- the R 1 group of the monophosphoric ester A of formula (I) is a linear alkyl group comprising 7 to 10 carbon atoms, preferably 8 to 9 carbon atoms, particularly preferably comprising 8 carbon atoms and the compound B is a compound of formula (IV) with R 5 being an alkylated aromatic group, preferably carrying 6 to 10 carbon atoms, R6 being a hydrogen atom and n being different from zero.
- the mass percentage of the ether is less than 40% relative to the mass of the monophosphoric ester A and the ether.
- compound B is a fatty acid or a fixed oil.
- component B is a saturated or unsaturated fatty acid having at least 12 carbon atoms.
- the fatty acid comprises from 12 to 22 carbon atoms, more preferably from 14 to 20 carbon atoms and most preferably from 16 to 18 carbon atoms.
- the mass percentage of fatty acid is less than 60%, preferably less than 40%, preferably less than 20% relative to the mass of the monophosphoric ester A and the fatty acid.
- compound B When compound B is a fixed oil, it can be rapeseed oil or sunflower oil.
- the mass percentage of the fixed oil is less than 50%, preferably less than 30%, preferably less than 10% relative to the mass of the monophosphoric ester A and the fixed oil.
- the collector consists of the monophosphoric ester A of formula (I) and the compound B as described above.
- the collector according to the invention is more efficient than the collectors of the prior art and can be used in smaller quantities.
- the quantity of monophosphoric ester A and compound B added during step (i) varies from 100 g to 500 g per tonne of phosphate ores, preferably from 100 g to 300 g, particularly preferably from 120 g/tonne to 260 g/tonne of phosphate ores.
- the collectors according to the invention make it possible to develop their own foam without it being necessary to add an additional foaming agent, such as methyl isobutyl carbinol (MIBC) or pine oil.
- an additional foaming agent such as methyl isobutyl carbinol (MIBC) or pine oil.
- the process of the present invention does not require the use of an additional frothing agent, pH regulating agent or activating agent during the flotation process.
- the suspensions of ores and collectors according to the invention are pH neutral and do not require the addition of a pH regulator.
- a pH regulating agent is used when collectors based on fatty acids are used.
- flotation activators which can also act as pH regulators, such as sodium hydroxide or sulfuric acid, is not necessary.
- the treatment method according to the invention further comprises a step i') before step i) of adding a depressant such as phosphoric acid and/or a step i'') between step i) and step ii) of adding an amine compound for the flotation of silicates.
- a depressant such as phosphoric acid
- a step i'' between step i) and step ii) of adding an amine compound for the flotation of silicates.
- Depressant agents such as phosphoric acid and its derivatives, diphosphonic acid [DPA] and orthophosphoric acid [OPA] may be used.
- an amine collector such as the products from the FLOTINORTM and FLOTIGAMTM ranges can be added to the aqueous suspension from step i).
- Step (ii) of gas injection allows the foams comprising carbonates and heavy metals to float to the surface of the suspension.
- the gas is injected so as to form homogeneous gas bubbles which, after adsorption with the foams, will transport the foams by flotation to the surface of the suspension.
- the gas bubbles can be formed by any means known to those skilled in the art, for example by a porous bottom, sintered glass or by one or more injection nozzles.
- the gas injected in step (ii) may be air, nitrogen, or any other gas inert with respect to the species present.
- step (ii) can be carried out at a constant flow rate.
- a person skilled in the art will know how to adapt the flow rate of the gas injection.
- Step (ii) is carried out with stirring in order to have a homogeneous distribution of the gas bubbles in the aqueous suspension.
- Stirring can be ensured by any means known to those skilled in the art, such as for example mechanical stirring such as a rotor or magnetic stirring.
- step (ii) can be carried out for a time ranging from 5 seconds to 30 minutes, typically 5 seconds to 5 minutes.
- the treatment process comprises a step (iii) of separating the foams containing carbonates and heavy metals from the ore suspension.
- the recovered foams can possibly be reprocessed in order to separate and recover the extracted heavy metals.
- the treated ore suspension obtained at the end of step (iii) is recovered after removal of the foams.
- the foams are recovered in step (iii) from the upper part of the treated phosphoric acid solution by any means known to those skilled in the art.
- the flotation foams may be discharged into a recovery tank.
- the process according to the invention makes it possible to obtain a mass percentage of floated product (rejected) expressed in relation to the total mass of floated product and dried concentrate recovered of less than 25%.
- the percentage of tricalcium phosphate (BPL or bone phosphate of lime) or P2O5 expressed in relation to the total mass of dried concentrate, as well as the cadmium and arsenic content in the concentrate are respectively increased and decreased compared to the untreated ore.
- the percentage of tricalcium phosphate (BPL or bone phosphate of lime) is greater than or equal to 65% after implementing the method according to the invention.
- the percentage of P 2 O 5 is greater than or equal to 30% after implementing the method according to the invention.
- the percentage of tricalcium phosphate (BPL or bone phosphate of lime) is greater than or equal to 70% after implementing the method according to the invention.
- the percentage of P 2 O 5 is greater than or equal to 32% after implementing the method according to the invention.
- the method according to the invention is implemented in a flotation device, such as a flotation column combined with a froth recovery tank in the upper part of the column, as shown schematically in FIG. .
- Part I comprises the flotation column which consists of a glass column 1 filled with the phosphate ore pulp conditioned with the flotation collector according to the invention.
- the gas is introduced into the bottom of the column, the gas bubbles are formed by the passage of the gas through the sintered glass 2.
- the gas is generated by a gas generator 3 and its flow rate is controlled by a flow meter 4.
- the medium is stirred by a magnetic bar 5 with a magnetic stirrer 6 which makes it possible to obtain a good distribution of the gas bubbles 7.
- the foams 8 are formed on contact with the gas bubbles.
- the foams are then entrained at the top of the column in a foam evacuation zone 9 corresponding to part II, called the separation part.
- the foams 8 then flow into a foam recovery tank 10.
- the residence time in the flotation device is generally less than 30 minutes, preferably between 5 seconds and 5 minutes.
- the ion flotation treatment process can be carried out at a temperature ranging from 15 to 90°C or from 20 to 80°C.
- Another subject of the invention relates to the use of monophosphoric ester A, alone or in combination with compound B as described above for the treatment of phosphate ores containing heavy metals.
- monophosphoric ester A and compound B as described above as a collector according to the invention makes it possible to have new processes for treating phosphate ores, which are simpler and less expensive, making it possible to enrich their P 2 O 5 content but also to reduce their content of heavy metals, such as cadmium and arsenic.
- the collector according to the invention is more effective than the compositions of the prior art and can be used in smaller quantities.
- Table 1 Characterization of a sample of phosphate ore from Khouribga
- a Denver D-12 flotation cell is used.
- the Mono-Octylphosphoric ester collector at a concentration of 250 g/t allows to obtain a BPL content of 71.24 (32.59% of P 2 O 5 ) with a loss of 24.74% by weight.
- the Mono-Nonylphosphoric ester collector allows to obtain a BPL content of 69.56 (31.83% of P 2 O 5 ) with a loss of 17.27% by weight for a concentration of only 125g/t.
- the Cadmium content is reduced by 75% and the Arsenic content is reduced by 70%.
- Tables 3 to 6 illustrate the effect of combining the ester with a linear C8 chain and an ester with a branched chain.
- Table 7 illustrates the effect of combining a monophosphoric ester and an alcohol.
- Flotation process Collector Flotation Recovery (%) MgO (%) BPL (%) P 2 O 5 (%) CD (ppm) As (ppm) Reference Composition Floated (Rejected) Content (%) in concentrate 1 Octyl Phosphate (100%) --- 23.29 0.33 71.32 32.64 8 4 2 Octyl Phosphate (90%) 1-Octanol (10%) 19.56 0.34 70.61 32.31 8 4 3 Octyl Phosphate (80%) 1-Octanol (20%) 15.59 0.34 69.85 31.96 --- --- 4 Octyl Phosphate (70%) 1-Octanol (30%) 15.04 0.34 69.82 31.94 --- --- 5 Octyl Phosphate (60%) 1-Octanol (40%) 11.20 0.36 68.25 31.23 --- --- 6 Octyl Phosphate (
- compositions comprising less than 30% by mass of octanol, a P 2 O 5 content greater than or equal to 32% is obtained for the treated ore.
- Example 4 Evaluation of the combination of an ester monophosphoric and a sulfate
- Table 8 illustrates the effect of combining a monophosphoric ester and a sulfate.
- Flotation process Collector Flotation Recovery (%) MgO (%) BPL (%) P 2 O 5 (%) CD (ppm) As (ppm) Reference Composition Floated (Rejected) Content (%) in concentrate 1 Octyl Phosphate (100%) --- 23.29 0.33 71.32 32.64 8 4 2 Octyl Phosphate (90%) Sodium dodecyl sulfate (10%) 17.88 0.30 70.59 32.30 8 4 3 Octyl Phosphate (80%) Sodium dodecyl sulfate (20%) 16.63 0.31 70.39 32.21 9 4 4 Octyl Phosphate (70%) Sodium dodecyl sulfate (30%) 11.20 0.28 69.29 31.70 --- --- 5 Octyl Phosphate (60%) Sodium dodecyl sulfate (40%) 8.91
- compositions comprising less than 20% by mass of sulfate, a BPL content greater than or equal to 32% is obtained for the treated ore.
- Example 5 Evaluation of the combination of an ester monophosphoric and a fatty acid
- Table 9 illustrates the effect of combining a monophosphoric ester and a fatty acid.
- Flotation process Collector Flotation Recovery (%) MgO (%) BPL (%) P 2 O 5 (%) CD (ppm) As (ppm) Reference Composition Floated (Rejected) Content (%) in concentrate 1 Octyl Phosphate (100%) --- 23.29 0.33 71.32 32.64 8 4 2 Octyl Phosphate (80%) Linoleic Acid (20%) 12.13 0.29 66.55 30.45 --- --- 3 Octyl Phosphate (60%) Linoleic Acid (40%) 8.93 0.30 64.79 29.64 --- --- 4 Octyl Phosphate (50%) Linoleic Acid (50%) 5.97 0.30 64.77 29.63 --- --- 5 Octyl Phosphate (40%) Linoleic Acid (60%) 4.64 0.31 64.03 29.30 --- --- 6 Octyl Phosphate (20%) Lino
- Table 10 illustrates the effect of combining a monophosphoric ester and an oil.
- Flotation process Collector Flotation Recovery (%) MgO (%) BPL (%) P 2 O 5 (%) CD (ppm) As (ppm) Reference Composition Floated (Rejected) Content (%) in concentrate 1 Octyl Phosphate (100%) --- 23.29 0.33 71.32 32.64 8 4 2 Octyl Phosphate (90%) Sunflower Oil (10%) 13.30 0.3 68.98 31.56 3 Octyl Phosphate (80%) Sunflower Oil (20%) 11.34 0.29 69.30 31.71 --- --- 4 Octyl Phosphate (70%) Sunflower Oil (30%) 10.20 0.29 67.50 30.88 --- --- 5 Octyl Phosphate (60%) Sunflower Oil (40%) 6.59 0.29 65.12 29.79 --- --- 6 Octyl Phosphate (50%) Sunflower Oil (50%) 5.73 0.29 64.34 29.44
- Example 7 Evaluation of the combination of an ester monophosphoric and a sulfonate
- Table 11 illustrates the effect of combining a monophosphoric ester and a sulfonate.
- Flotation process Collector Flotation Recovery (%) MgO (%)
- BPL (%) P 2 O 5 (%)
- CD ppm
- As (ppm) Reference Composition Floated (Rejected) Content (%) in concentrate 1 Octyl Phosphate (100%) --- 23.29 0.33 71.32 32.64 8 4 3 Octyl Phosphate (80%) Dodecylbenzene sulfonic acid (20%) 16.01 0.30 71.07 32.52 8 4 5 Octyl Phosphate (60%) Dodecylbenzene sulfonic acid (40%) 12.56 0.30 70.03 32.04 8 4
- Example 8 Evaluation of the combination of an ester monophosphoric and a ether pe g yle
- Table 12 illustrates the effect of combining a monophosphoric ester and a pegylated ether.
- Flotation process Collector Flotation Recovery (%) MgO (%) BPL (%) P 2 O 5 (%) CD (ppm) As (ppm) Reference Composition Floated (Rejected) Content (%) in concentrate 1 Octyl Phosphate (100%) --- 23.29 0.33 71.32 32.64 8 4 2 Octyl Phosphate (90%) IGEPAL CA-630 (10%) 22.83 0.32 71.38 32.66 7 4 3 Octyl Phosphate (80%) IGEPAL CA-630 (20%) 20.69 0.32 70.72 32.36 8 4 4 Octyl Phosphate (70%) IGEPAL CA-630 (30%) 18.00 0.31 70.99 32.48 8 4 5 Octyl Phosphate (60%) IGEPAL CA-630 (40%) 18.16 0.32 68.98 31.56 --- ---
- Phosphate ore contains heavy metals, especially cadmium at 15 ppm.
- the monoester of phosphoric acid is octylphosphate (mono-octylphosphoric ester).
- the diester of phosphoric acid is dioctylphosphate (dio-octylphosphoric ester).
- the phosphate ore is processed as described in paragraph 3.1.
- Table 14 shows the effect of combining the monoester with linear C8 chain and a diester with linear C8 chains.
- Flotation process Collector Flotation Recovery (%) MgO (%)
- BPL (%) P 2 O 5 (%)
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Abstract
Description
Ils peuvent impliquer d’utiliser des agents moussants, des agents régulateurs de pH ou encore des agents activateurs. En particulier, ces procédés nécessitent des quantités élevées de collecteurs, et impliquent de travailler dans une gamme de pH acides.
ci-dessus,
6 à 10 atomes de carbone, préférentiellement de 8 à 10 atomes de carbone.
- de pourcentage massique de produit flotté (rejeté) exprimé par rapport à la masse totale de produit flotté et de concentré séchés récupérés
- de pourcentages massiques en oxyde magnésium (MgO), en phosphate tricalcique (BPL ou bone phosphate of lime) ou P2O5 exprimés par rapport à la masse totale de concentré séché, ainsi que la teneur en cadmium et arsenic dans le concentré. La teneur en BPL est obtenue en multipliant la teneur en P2O5 par un facteur correctif de 2,185.
Les mousses 8 se déversent alors dans un bac de récupération des mousses 10.
- Caractérisation minéralogique du minerai de phosphate
Tableau 1.
| P2O5 (%) | CO2 (%) | MgO (%) | SiO2 (%) | Cd (ppm) | As (ppm) |
| 28,57 | 8,66 | 0,3 | 6 ,42 | 27 | 13 |
- Synthèse des esters monophosphoriques
-
Procédé de traitement du minerai
- Mode opératoire
- Evaluation des différents collecteurs
- de pourcentage massique de produit flotté (rejeté) exprimé par rapport à la masse totale de produit flotté et de concentré séchés récupérés
- de pourcentages massiques en oxyde magnésium (MgO), en phosphate tricalcique (BPL ou bone phosphate of lime) ou P2O5 exprimés par rapport à la masse totale de concentré séché, ainsi que la teneur en cadmium et arsenic dans le concentré. La teneur en BPL est obtenue en multipliant la teneur en P2O5 par un facteur correctif de 2,185.
| Procédé de flottation | Collecteur | Flottation | ||||||
| Récupération (%) | MgO (%) | BPL (%) | P2O5
(%) | Cd (ppm) | As (ppm) | |||
| Référence | Alkyle Chaine | teneur (g/t) | Flotté (Rejeté) | Teneur (%) dans le concentré | ||||
| 1 | C6 | 250 | 7,43 | 0,29 | 64,92 | 29,70 | --- | --- |
| 3 | C8 | 250 | 24,74 | 0,30 | 71,24 | 32,59 | 8 | 4 |
| 4 | C9 | 125 | 17,27 | 0,28 | 69,56 | 31,83 | --- | --- |
| 5 | C10 | 250 | 6,68 | 0,29 | 66,59 | 30,47 | --- | --- |
| C-6 | C12 | 250 | 0,00 | 0,30 | 62,43 | 28,57 | 27 | 13 |
| C-7 | C14 | 250 | 0,00 | 0,30 | 62,43 | 28,57 | 27 | 13 |
| C-8 | C18 (Oleyl) | 250 | 0,00 | 0,30 | 62,43 | 28,57 | 27 | 13 |
| Procédé de flottation | Collecteur | Flottation | ||||||
| Récupération (%) | MgO (%) | BPL (%) | P2O5
(%) | Cd (ppm) | As (ppm) | |||
| Référence | Composition | Flotté (Rejeté) | Teneur (%) dans le concentré | |||||
| 1 | Octyl Phosphate (100%) | --- | 24,74 | 0,30 | 71,24 | 32,59 | 8 | 4 |
| 2 | Octyl Phosphate (80%) | 2-Ethylhexyl phosphate (20%) | 18,20 | 0,36 | 70,12 | 32,08 | 7 | 4 |
| 3 | Octyl Phosphate (60%) | 2-Ethylhexyl phosphate (40%) | 16,78 | 0,33 | 68,02 | 31,12 | --- | --- |
| 4 | Octyl Phosphate (50%) | 2-Ethylhexyl phosphate (50%) | 14,56 | 0,33 | 67,68 | 30,97 | --- | --- |
| 5 | Octyl Phosphate (40%) | 2-Ethylhexyl phosphate (60%) | 14,78 | 0,34 | 69,36 | 31,74 | --- | --- |
| 6 | Octyl Phosphate (20%) | 2-Ethylhexyl phosphate (80%) | 14,38 | 0,36 | 69,05 | 31,59 | --- | --- |
| 7 | --- | 2-Ethylhexyl phosphate (100%) | 11,93 | 0,34 | 68,97 | 31,56 | --- | --- |
| Procédé de flottation | Collecteur | Flottation | ||||||
| Récupération (%) | MgO (%) |
BPL (%) |
P2O5
(%) |
Cd (ppm) |
As (ppm) |
|||
| Référence | Composition | Flotté (Rejeté) | Teneur (%) dans le concentré | |||||
| 1 | Octyl Phosphate (100%) | --- | 24,74 | 0,30 | 71,24 | 32,59 | 8 | 4 |
| 2 | Octyl Phosphate (80%) | 2,4,4-trimethylpentyl phosphate (20%) | 16,30 | 0,34 | 70,22 | 32,13 | 7 | 4 |
| 3 | Octyl Phosphate (60%) | 2,4,4-trimethylpentyl phosphate (40%) | 14,66 | --- | 70,36 | 32,19 | 7 | 4 |
| 4 | Octyl Phosphate (50%) | 2,4,4-trimethylpentyl phosphate (50%) | 12,93 | 0,46 | 69,03 | 31,58 | --- | --- |
| 5 | Octyl Phosphate (40%) | 2,4,4-trimethylpentyl phosphate (60%) | 11,66 | 0,31 | 67,18 | 30,74 | --- | --- |
| 6 | Octyl Phosphate (20%) | 2,4,4-trimethylpentyl phosphate (80%) | 11,33 | 0,31 | 69,08 | 31,61 | --- | --- |
| 7 | --- | 2,4,4-trimethylpentyl phosphate (100%) | 9,67 | 0,31 | 66,55 | 30,45 | --- | --- |
| Procédé de flottation | Collecteur | Flottation | ||||||
| Récupération (%) | MgO (%) |
BPL (%) |
P2O5
(%) |
Cd (ppm) |
As (ppm) |
|||
| Référence | Composition | Flotté (Rejeté) | Teneur (%) dans le concentré | |||||
| 1 | Octyl Phosphate (100%) | --- | 24,74 | 0,30 | 71,24 | 32,59 | 8 | 4 |
| 2 | Octyl Phosphate (80%) | 3,5,5-trimethylhexyl phosphate (20%) | 21,32 | 0,32 | 70,35 | 32,19 | 7 | 4 |
| 3 | Octyl Phosphate (60%) | 3,5,5-trimethylhexyl phosphate (40%) | 19,99 | 0,32 | 69,07 | 31,60 | --- | --- |
| 4 | Octyl Phosphate (50%) | 3,5,5-trimethylhexyl phosphate (50%) | 20,81 | 0,32 | 70,02 | 32,04 | 8 | 4 |
| 5 | Octyl Phosphate (40%) | 3,5,5-trimethylhexyl phosphate (60%) | 23,89 | 0,31 | 70,29 | 32,16 | 8 | 4 |
| 6 | Octyl Phosphate (20%) | 3,5,5-trimethylhexyl phosphate (80%) | 23,48 | 0,41 | 70,05 | 32,05 | 8 | 4 |
| 7 | --- | 3,5,5-trimethylhexyl phosphate (100%) | 21,10 | 0,32 | 68,59 | 31,38 | --- | --- |
| Procédé de flottation | Collecteur | Flottation | ||||||
| Récupération (%) | MgO (%) |
BPL (%) |
P2O5
(%) |
Cd (ppm) |
As (ppm) |
|||
| Référence | Composition | Flotté (Rejeté) | Teneur (%) dans le concentré | |||||
| 1 | Decyl Phosphate (100%) | --- | 6,68 | 0,29 | 66,59 | 30,47 | --- | --- |
| 2 | Decyl Phosphate (90%) | Hexyl Phosphate (10%) | 8,88 | 0,32 | 66,86 | 30,59 | --- | --- |
| 3 | Decyl Phosphate (80%) | Hexyl Phosphate (20%) | 8,88 | 0,31 | 67,25 | 30,77 | --- | --- |
| 4 | Decyl Phosphate (70%) | Hexyl Phosphate (30%) | 8,39 | 0,30 | 67,60 | 30,93 | --- | --- |
| 5 | Decyl Phosphate (60%) | Hexyl Phosphate (40%) | 16,46 | 0,28 | 68,41 | 31,30 | --- | --- |
| 6 | Decyl Phosphate (50%) | Hexyl Phosphate (50%) | 12,50 | 0,29 | 67,88 | 31,06 | --- | --- |
| 7 | Decyl Phosphate (40%) | Hexyl Phosphate (60%) | 12,87 | 0,30 | 68,10 | 31,16 | --- | --- |
| 8 | Decyl Phosphate (30%) | Hexyl Phosphate (70%) | --- | --- | --- | --- | --- | --- |
| 9 | Decyl Phosphate (20%) | Hexyl Phosphate (80%) | 8,91 | 0,29 | 67,89 | 31,06 | --- | --- |
| 10 | Decyl Phosphate (10%) | Hexyl Phosphate (90%) | 7,12 | 0,28 | 65,43 | 29,94 | --- | --- |
| 11 | --- | Hexyl Phosphate (100%) | 7,43 | 0,29 | 64,92 | 29,70 | --- | --- |
| Procédé de flottation | Collecteur | Flottation | ||||||
| Récupération (%) | MgO (%) | BPL (%) | P2O5
(%) | Cd (ppm) | As (ppm) | |||
| Référence | Composition | Flotté (Rejeté) | Teneur (%) dans le concentré | |||||
| 1 | Octyl Phosphate (100%) | --- | 23,29 | 0,33 | 71,32 | 32,64 | 8 | 4 |
| 2 | Octyl Phosphate (90%) | 1-Octanol (10%) | 19,56 | 0,34 | 70,61 | 32,31 | 8 | 4 |
| 3 | Octyl Phosphate (80%) | 1-Octanol (20%) | 15,59 | 0,34 | 69,85 | 31,96 | --- | --- |
| 4 | Octyl Phosphate (70%) | 1-Octanol (30%) | 15,04 | 0,34 | 69,82 | 31,94 | --- | --- |
| 5 | Octyl Phosphate (60%) | 1-Octanol (40%) | 11,20 | 0,36 | 68,25 | 31,23 | --- | --- |
| 6 | Octyl Phosphate (50%) | 1-Octanol (50%) | 10,20 | 0,35 | 64,49 | 29,51 | --- | --- |
| 7 | Octyl Phosphate (40%) | 1-Octanol (60%) | 5,73 | 0,33 | 65,25 | 29,86 | --- | --- |
| 8 | Octyl Phosphate (30%) | 1-Octanol (70%) | 4,69 | 0,35 | 64,45 | 29,49 | --- | --- |
| 9 | Octyl Phosphate (20%) | 1-Octanol (80%) | 1,39 | 0,37 | 63,28 | 28,95 | --- | --- |
| 10 | Octyl Phosphate (10%) | 1-Octanol (90%) | 4,19 | 0,36 | 64,13 | 29,34 | --- | --- |
| 11 | --- | 1-Octanol (100%) | 0,84 | 0,36 | 62,95 | 28,80 | --- | --- |
| Procédé de flottation | Collecteur | Flottation | ||||||
| Récupération (%) | MgO (%) | BPL (%) | P2O5
(%) | Cd (ppm) | As (ppm) | |||
| Référence | Composition | Flotté (Rejeté) | Teneur (%) dans le concentré | |||||
| 1 | Octyl Phosphate (100%) | --- | 23,29 | 0,33 | 71,32 | 32,64 | 8 | 4 |
| 2 | Octyl Phosphate (90%) | Sodium dodecyl sulfate (10%) | 17,88 | 0,30 | 70,59 | 32,30 | 8 | 4 |
| 3 | Octyl Phosphate (80%) | Sodium dodecyl sulfate (20%) | 16,63 | 0,31 | 70,39 | 32,21 | 9 | 4 |
| 4 | Octyl Phosphate (70%) | Sodium dodecyl sulfate (30%) | 11,20 | 0,28 | 69,29 | 31,70 | --- | --- |
| 5 | Octyl Phosphate (60%) | Sodium dodecyl sulfate (40%) | 8,91 | 0,3 | 67,84 | 31,04 | --- | --- |
| 6 | Octyl Phosphate (50%) | Sodium dodecyl sulfate (50%) | 5,29 | 0,29 | 67,02 | 30,66 | --- | --- |
| 7 | Octyl Phosphate (40%) | Sodium dodecyl sulfate (60%) | 3,59 | 0,28 | 65,3 | 29,88 | --- | --- |
| C-8 | Octyl Phosphate (30%) | Sodium dodecyl sulfate (70%) | 0,00 | 0,30 | 62,43 | 28,57 | 27 | 13 |
| C-9 | Octyl Phosphate (20%) | Sodium dodecyl sulfate (80%) | 0,00 | 0,30 | 62,43 | 28,57 | 27 | 13 |
| C-10 | Octyl Phosphate (10%) | Sodium dodecyl sulfate (90%) | 0,00 | 0,30 | 62,43 | 28,57 | 27 | 13 |
| C-11 | --- | Sodium dodecyl sulfate (100%) | 0,00 | 0,30 | 62,43 | 28,57 | 27 | 13 |
| Procédé de flottation | Collecteur | Flottation | ||||||
| Récupération (%) | MgO (%) | BPL (%) | P2O5
(%) | Cd (ppm) | As (ppm) | |||
| Référence | Composition | Flotté (Rejeté) | Teneur (%) dans le concentré | |||||
| 1 | Octyl Phosphate (100%) | --- | 23,29 | 0,33 | 71,32 | 32,64 | 8 | 4 |
| 2 | Octyl Phosphate (80%) | Linoleic Acid (20%) | 12,13 | 0,29 | 66,55 | 30,45 | --- | --- |
| 3 | Octyl Phosphate (60%) | Linoleic Acid (40%) | 8,93 | 0,30 | 64,79 | 29,64 | --- | --- |
| 4 | Octyl Phosphate (50%) | Linoleic Acid (50%) | 5,97 | 0,30 | 64,77 | 29,63 | --- | --- |
| 5 | Octyl Phosphate (40%) | Linoleic Acid (60%) | 4,64 | 0,31 | 64,03 | 29,30 | --- | --- |
| 6 | Octyl Phosphate (20%) | Linoleic Acid (80%) | 3,10 | 0,32 | 62,67 | 28,67 | --- | --- |
| C-7 | --- | Linoleic Acid (100%) | 0,00 | 0,30 | 62,43 | 28,57 | 27 | 13 |
| Procédé de flottation | Collecteur | Flottation | ||||||
| Récupération (%) | MgO (%) | BPL (%) | P2O5
(%) | Cd (ppm) | As (ppm) | |||
| Référence | Composition | Flotté (Rejeté) | Teneur (%) dans le concentré | |||||
| 1 | Octyl Phosphate (100%) | --- | 23,29 | 0,33 | 71,32 | 32,64 | 8 | 4 |
| 2 | Octyl Phosphate (90%) | Huile de Tournesol (10%) | 13,30 | 0,3 | 68,98 | 31,56 | ||
| 3 | Octyl Phosphate (80%) | Huile de Tournesol (20%) | 11,34 | 0,29 | 69,30 | 31,71 | --- | --- |
| 4 | Octyl Phosphate (70%) | Huile de Tournesol (30%) | 10,20 | 0,29 | 67,50 | 30,88 | --- | --- |
| 5 | Octyl Phosphate (60%) | Huile de Tournesol (40%) | 6,59 | 0,29 | 65,12 | 29,79 | --- | --- |
| 6 | Octyl Phosphate (50%) | Huile de Tournesol (50%) | 5,73 | 0,29 | 64,34 | 29,44 | --- | --- |
| 7 | Octyl Phosphate (40%) | Huile de Tournesol (60%) | 4,58 | 0,30 | 63,05 | 28,85 | --- | --- |
| C-8 | Octyl Phosphate (30%) | Huile de Tournesol (70%) | 0,00 | 0,30 | 62,43 | 28,57 | 27 | 13 |
| C-9 | Octyl Phosphate (20%) | Huile de Tournesol (80%) | 0,00 | 0,30 | 62,43 | 28,57 | 27 | 13 |
| C-10 | Octyl Phosphate (10%) | Huile de Tournesol (90%) | 0,00 | 0,30 | 62,43 | 28,57 | 27 | 13 |
| C-11 | --- | Huile de Tournesol (100%) | 0,00 | 0,30 | 62,43 | 28,57 | 27 | 13 |
| Procédé de flottation | Collecteur | Flottation | ||||||
| Récupération (%) | MgO (%) | BPL (%) | P2O5
(%) | Cd (ppm) | As (ppm) | |||
| Référence | Composition | Flotté (Rejeté) | Teneur (%) dans le concentré | |||||
| 1 | Octyl Phosphate (100%) | --- | 23,29 | 0,33 | 71,32 | 32,64 | 8 | 4 |
| 3 | Octyl Phosphate (80%) | Dodecylbenzene sulfonic acid (20%) | 16,01 | 0,30 | 71,07 | 32,52 | 8 | 4 |
| 5 | Octyl Phosphate (60%) | Dodecylbenzene sulfonic acid (40%) | 12,56 | 0,30 | 70,03 | 32,04 | 8 | 4 |
| Procédé de flottation | Collecteur | Flottation | ||||||
| Récupération (%) | MgO (%) | BPL (%) | P2O5
(%) | Cd (ppm) | As (ppm) | |||
| Référence | Composition | Flotté (Rejeté) | Teneur (%) dans le concentré | |||||
| 1 | Octyl Phosphate (100%) | --- | 23,29 | 0,33 | 71,32 | 32,64 | 8 | 4 |
| 2 | Octyl Phosphate (90%) | IGEPAL CA-630 (10%) | 22,83 | 0,32 | 71,38 | 32,66 | 7 | 4 |
| 3 | Octyl Phosphate (80%) | IGEPAL CA-630 (20%) | 20,69 | 0,32 | 70,72 | 32,36 | 8 | 4 |
| 4 | Octyl Phosphate (70%) | IGEPAL CA-630 (30%) | 18,00 | 0,31 | 70,99 | 32,48 | 8 | 4 |
| 5 | Octyl Phosphate (60%) | IGEPAL CA-630 (40%) | 18,16 | 0,32 | 68,98 | 31,56 | --- | --- |
| P2O5 (%) | CO2 (%) | MgO (%) | SiO2 (%) | Cd (ppm) |
| 21,83 | 8,85 | 1,84 | 22,62 | 15 |
| Procédé de flottation | Collecteur | Flottation | |||||
| Récupération (%) | MgO (%) | BPL (%) | P2O5
(%) | Cd (ppm) | |||
| Référence | Composition | Flotté (Rejeté) | Teneur (%) dans le concentré | ||||
| 1 | Octyl Phosphate (100%) | --- | 24,70 | 0,33 | 71,32 | 32,64 | 8 |
| 2 | Octyl Phosphate (95%) | Dioctyl Phosphate (5%) | 25,81 | 1,00 | 61,37 | 28,09 | 15 |
| 3 | Octyl Phosphate (90%) | Dioctyl Phosphate (10%) | 26,23 | 1,00 | 62,09 | 28,42 | 16 |
| 3 | Octyl Phosphate (80%) | Dioctyl Phosphate (20%) | 27,76 | 0,90 | 62,40 | 28,56 | 17 |
| 4 | Octyl Phosphate (60%) | Dioctyl Phosphate (40%) | 28,04 | 0,93 | 64,24 | 29,40 | 15 |
| 5 | Octyl Phosphate (40%) | Dioctyl Phosphate (60%) | 24,53 | 1,21 | 61,38 | 28,09 | 15 |
| 6 | Octyl Phosphate (20%) | Dioctyl Phosphate (80%) | 21,69 | 1,60 | 59,44 | 27,20 | 15 |
| 7 | --- | Dioctyl Phosphate (100%) | 17,45 | 1,91 | 56,37 | 25,80 | 15 |
Claims (8)
- Procédé de traitement de minerais de phosphates contenant des métaux lourds par flottation inverse, le procédé comprenant les étapes suivantes :
- (i) addition à une suspension aqueuse de minerai de phosphate d’un ester monophosphorique A de formule (I) :
R1 – O – P(=O) – (OH)2 (I)
dans laquelle R1 est une chaîne hydrocarbonée, linéaire ou ramifiée, saturée ou non, comprenant 6 à 10 atomes de carbones, préférentiellement un groupement alkyle,
seul ou en mélange avec un composé B sélectionné dans le groupe constitué de :
un ester monophosphorique de formule (II)
R2 – O – P(=O) – (OH)2 (II)
dans laquelle R2 est une chaîne hydrocarbonée, linéaire ou ramifiée, saturée ou non , comprenant 6 à 18 atomes de carbones, préférentiellement un groupement alkyle, différente du groupement R1 de l’ester monophosphorique A de formule (I) ,
un alcool,
un acide gras,
une huile fixe,
un sulfate,
un sulfonate,
un éther, et
leurs mélanges ;
- (ii) injection de gaz dans la suspension aqueuse pour former des mousses ; et
- (iii) élimination des mousses et récupération de la suspension aqueuse de minerai traitée. - Procédé de traitement selon la revendication 1, caractérisé en ce que le groupement R1 de l’ester monophosphorique A de formule (I) est un groupement alkyle linéaire comprenant 8 ou 9 atomes de carbone ou un groupement alkyle ramifié comprenant 8 ou 9 atomes de carbone.
- Procédé de traitement selon la revendication 1 ou la revendication 2, caractérisé en ce que le composé B, lorsqu’il est présent, est un alcool de formule R3-OH (III), R3 étant une chaîne hydrocarbonée, linéaire ou ramifiée, saturée ou non comprenant 2 à 20 atomes de carbones, préférentiellement 6 à 10 atomes de carbone, de préférence un groupement alkyle.
- Procédé de traitement selon la revendication 1 ou la revendication 2, caractérisé en ce que le composé B, lorsqu’il est présent, est :
un sel d’un acide sulfonique à chaîne hydrocarbonée ou un sel d’un acide sulfonique aromatique substitué par une chaîne hydrocarbonée, la chaîne hydrocarbonée étant linéaire ou ramifiée, saturée ou non comprenant 2 à 20 atomes de carbone, de préférence un groupement alkyle, le composé B étant préférentiellement le sel de sodium de l’acide dodecyl benzène sulfonique ;
ou est un sulfate à chaîne hydrocarbonée, la chaîne hydrocarbonée étant linéaire ou ramifiée, saturée ou non comprenant 2 à 20 atomes de carbone, de préférence un sulfate d’alkyle, préférentiellement le dodecylsulfate de sodium. - Procédé de traitement selon la revendication 1 ou la revendication 2, caractérisé en ce que le composé B, lorsqu’il est présent, est un ether, pégylé ou non, de formule R5-(OC2H4)nO-R6 (IV) avec R5 étant un groupement alkyle ou aromatique ou aromatique alkylé et R6 étant un groupement alkyle ou un atome d’hydrogène et n représente un entier allant de 0 à 10.
- Procédé de traitement selon l’une quelconque des revendications précédentes, caractérisé en ce que la quantité de l’ester monophosphorique A et du composé B ajoutés lors de l’étape (i) va de 100 g à 500 g par tonne de minerais de phosphates, préférentiellement de 100g à 300g.
- Procédé de traitement selon l’une quelconque des revendications précédentes, caractérisé en ce qu’il comprend en outre une étape i’) avant l’étape i) d’ajout d’un déprimant tel que l’acide phosphorique et/ou une étape i’’) entre l’étape i) et l’étape ii) d’ajout d’un composé aminé pour la flottation des silicates.
- Utilisation de l’ester monophosphorique A seul ou en combinaison avec le composé B tels que décrits dans l’une quelconque des revendications 1 à 6 pour le traitement de minerais de phosphates contenant des métaux lourds.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP24710527.3A EP4665508A1 (fr) | 2023-02-15 | 2024-02-15 | Procédé de traitement de minerais de phosphates contenant des métaux lourds par flottation inverse |
| AU2024223160A AU2024223160A1 (en) | 2023-02-15 | 2024-02-15 | Method for treating phosphate ores containing heavy metals by reverse flotation |
| CN202480025286.0A CN121175122A (zh) | 2023-02-15 | 2024-02-15 | 反浮选处理含重金属磷矿石的方法 |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP23305204.2A EP4417314A1 (fr) | 2023-02-15 | 2023-02-15 | Procédé de traitement de minerais de phosphates contenant des métaux lourds par flottation inverse |
| EP23305204.2 | 2023-02-15 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO2024172639A1 true WO2024172639A1 (fr) | 2024-08-22 |
| WO2024172639A9 WO2024172639A9 (fr) | 2025-08-21 |
Family
ID=85328667
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/MA2024/050004 Ceased WO2024172639A1 (fr) | 2023-02-15 | 2024-02-15 | Procédé de traitement de minerais de phosphates contenant des métaux lourds par flottation inverse |
Country Status (4)
| Country | Link |
|---|---|
| EP (2) | EP4417314A1 (fr) |
| CN (1) | CN121175122A (fr) |
| AU (1) | AU2024223160A1 (fr) |
| WO (1) | WO2024172639A1 (fr) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2471217A1 (fr) * | 1979-12-17 | 1981-06-19 | Rech Geolog Miniere | Procede de traitement de minerais de phosphates a gangue silico-carbonatee |
| FR2489715A1 (fr) * | 1980-09-08 | 1982-03-12 | Rech Geolog Miniere | Procede de traitement de minerais de phosphates a gangue carbonatee ou silico-carbonatee |
| US4790931A (en) * | 1986-12-04 | 1988-12-13 | Henkel Kommanditgesellschaft Auf Aktien | Surfactant mixtures as collectors for the flotation of non-sulfidic ores |
| WO2001062344A1 (fr) | 2000-02-26 | 2001-08-30 | Tomorrows Design Company Limited | Procede et dispositif de suppression des incendies |
| US8657118B2 (en) | 2006-11-29 | 2014-02-25 | Kao Corporation, S.A. | Collector for the flotation of carbonates |
| WO2018197476A1 (fr) | 2017-04-25 | 2018-11-01 | Basf Se | Collecteurs pour l'enrichissement de phosphate provenant de minerais contenant du phosphate |
-
2023
- 2023-02-15 EP EP23305204.2A patent/EP4417314A1/fr not_active Withdrawn
-
2024
- 2024-02-15 CN CN202480025286.0A patent/CN121175122A/zh active Pending
- 2024-02-15 AU AU2024223160A patent/AU2024223160A1/en active Pending
- 2024-02-15 WO PCT/MA2024/050004 patent/WO2024172639A1/fr not_active Ceased
- 2024-02-15 EP EP24710527.3A patent/EP4665508A1/fr active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2471217A1 (fr) * | 1979-12-17 | 1981-06-19 | Rech Geolog Miniere | Procede de traitement de minerais de phosphates a gangue silico-carbonatee |
| FR2489715A1 (fr) * | 1980-09-08 | 1982-03-12 | Rech Geolog Miniere | Procede de traitement de minerais de phosphates a gangue carbonatee ou silico-carbonatee |
| US4790931A (en) * | 1986-12-04 | 1988-12-13 | Henkel Kommanditgesellschaft Auf Aktien | Surfactant mixtures as collectors for the flotation of non-sulfidic ores |
| WO2001062344A1 (fr) | 2000-02-26 | 2001-08-30 | Tomorrows Design Company Limited | Procede et dispositif de suppression des incendies |
| US8657118B2 (en) | 2006-11-29 | 2014-02-25 | Kao Corporation, S.A. | Collector for the flotation of carbonates |
| WO2018197476A1 (fr) | 2017-04-25 | 2018-11-01 | Basf Se | Collecteurs pour l'enrichissement de phosphate provenant de minerais contenant du phosphate |
Non-Patent Citations (1)
| Title |
|---|
| "Bailey's Industrial Oil and Fat Products", 15 July 2005, JOHN WILEY & SONS, INC., article GREGORIO C GERVAJIO: "Fatty Acids and Derivatives from Coconut", pages: 1 - 55, XP055035497, DOI: 10.1002/047167849X.bio039 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2024172639A9 (fr) | 2025-08-21 |
| CN121175122A (zh) | 2025-12-19 |
| EP4417314A1 (fr) | 2024-08-21 |
| AU2024223160A1 (en) | 2025-09-25 |
| EP4665508A1 (fr) | 2025-12-24 |
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