• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
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  • 优先权
    • 专利摘要:
    The invention relates to a method for treating an aqueous suspension of solid particles by means of a water soluble polymer added to the suspension, said polymer being obtained by polymerization of at least one nonionic monomer, at least one anionic monomer and an amount of at least one cationic monomer of 0.2 to 6 mol%. This process is particularly useful for the treatment of mineral residues and in particular residues resulting from the extraction of bituminous sand.
    公开号:FR3032700A1
    申请号:FR1551153
    申请日:2015-02-12
    公开日:2016-08-19
    发明作者:Morgan Tizzotti
    申请人:SNF SA；
    IPC主号:
    专利说明:

    [0001] METHOD FOR TREATING SOLID PARTICLE SUSPENSIONS IN WATER USING AMPHOTERIC POLYMERS FIELD OF THE INVENTION
    [0002] The invention relates to a method for treating a suspension of solid particles in water, such as mineral residues. This method comprises the step of contacting the suspension of solid particles in water with a particular amphoteric, water-soluble polymer. More specifically, the process consists in adding said amphoteric polymer in a thickener containing this suspension to be treated and / or during the transport of said suspension to a deposition zone for dehydration and solidification or adding said amphoteric polymer to said suspension and then to perform mechanical treatment, such as centrifugation, pressing or filtration.
    [0003] BACKGROUND OF THE INVENTION Suspensions of solid particles in water include all types of sludges, residues or waste materials. Suspensions can result from the transformation of ores. Examples include sludge or industrial residues and all mine washing and scrapping products resulting from mining, such as coal mining, diamond mining, phosphate mining, mining and quarrying. metal mines (aluminum, platinum, iron, gold, copper, silver, etc.). Suspensions may also result from sludge or tailings derived from bituminous sand treatment. These suspensions of solid particles generally comprise organic and / or mineral particles, such as, for example, clays, sediments, sand, metal oxides, petroleum, etc., mixed with water.
    [0004] The term "suspension" is used hereinafter and refers to the suspensions of solid particles as described above.
    [0005] 3032700 2 The treatment of these residues and other waste materials has become a technical, environmental and public order problem. The use of synthetic or natural polymers, such as coagulants and flocculants, to separate solids from the liquid is a common practice. For a long time, and even today, mineral sludge produced by physical or chemical processes of ores was stored in open ponds, ponds, dams or embankments in semi-liquid form. These large volumes of stored mud therefore create a real danger, especially if the dikes drop. Since traditional storage solutions are clearly dangerous, more and more national regulations have been issued, banning the abandonment of these areas. The regulations also call for an obligation to rehabilitate these sites, that is, the treatment and consolidation of soils. Improving the chemical and mechanical treatment of residues or sludge is therefore a major challenge.
    [0006] Various attempts have been made in recent decades to increase the sedimentation rate of residues in order to effectively recycle water and reduce the volume of residues. The main physical treatments include centrifugation, filtration, electrophoresis and electrocoagulation.
    [0007] On the other hand, chemical processes emerge. They include a process involving the addition of chemicals, such as sodium silicate, organic flocculants, inorganic coagulants, oxidizing and reducing agents and, more recently, carbon dioxide.
    [0008] In 1979-1980, Alsthom Atlantique and SNF (US Pat. No. 4,347,140) developed a multi-step flocculation system (superflocculation) specifically designed to treat clay tailings ponds from phosphate production. in Florida.
    [0009] The suspension treatment has been studied continuously: in 1986 according to the process described in document CA 1 273 888, then in 1994 in document WO 96/05146, in 2000 in document CA 2 407 869 and in 2004 in CA 1515581.
    [0010] In CA 2,682,542, the process involves the addition of modified polymers by copolymerization and / or branching. Polymers with hydrophobic groups, which have also been studied, have shown an improvement in the treatment of suspensions. Despite great advances over the past decade, there is still a need for polymer development that increases the speed and amount of water released from suspensions. The improvement of the physical characteristics of the dewatered sludge produced is also sought. SUMMARY OF THE INVENTION The present invention meets the above needs by a method of treating suspensions of solid particles in water using particular water-soluble amphoteric polymers. An amphoteric polymer is a polymer which comprises in its polymeric structure anionic functions providing negative charges and cationic functions providing positive charges.
    [0011] The invention relates to a method for treating a suspension of solid particles in water, comprising contacting said suspension with a water-soluble polymer, said polymer being amphoteric and containing a proportion of low and well-defined cationic monomer.
    [0012] According to the invention, it has surprisingly been found that the use of these polymers improves the performance of suspension treatments such as: - increasing the concentration of sludge at the outlet of a thickener or - the step dehydration and the steps of drying and solidifying the suspensions when they are discharged on the ground or - the mechanical treatment of the treated suspensions. The use of these polymers increases the drainage, the release of water and the general dehydration of the suspensions. It also improves the mechanical properties of the materials obtained after separation of the water and the clarity of the released aqueous fluid (also called liquor), which allows the reuse of the clarified water and its immediate provision for recirculation in the water. industrial installation. The treated slurry solidifies much faster, resulting in improved dry sludge properties.
    [0013] DETAILED DESCRIPTION OF THE INVENTION The invention relates to a process for treating an aqueous suspension of solid particles, wherein at least one water-soluble polymer is added to said suspension. The method is characterized in that said polymer comprises: - at least one nonionic monomer; at least one anionic monomer; at least one cationic monomer representing between 0.2 and 6 mol%.
    [0014] More particularly, the invention relates to a method of treating an aqueous suspension of solid particles, comprising the steps of: - preparing a water-soluble polymer comprising: at least one nonionic monomer; At least one anionic monomer; at least one cationic monomer representing between 0.2 and 6 mol% of the polymer; said water-soluble polymer is added to the aqueous suspension of solid particles.
    [0015] Surprisingly, the use of an amphoteric polymer containing a small and well-defined amount of at least one cationic monomer combined with at least one nonionic monomer and at least one anionic monomer allows the effective treatment of suspensions. solid. It is in this particular range of cationic monomer concentration and only in this range, and for this type of water-soluble polymer also comprising at least one nonionic monomer and at least one anionic monomer that the improvement of the Suspensions treatment is significant.
    [0016] The cationic monomer (s) may be selected from the group consisting of diallyldialkyl ammonium salts such as diallyl dimethyl ammonium chloride (DADMAC); acidified or quaternized salts of dialkylaminoalkyl acrylates and methacrylates, in particular dialkylaminoethyl acrylate (ADAME) and dialkylaminoethyl methacrylate (MADAME); acidified or quaternized salts of dialkyl-aminoalkylacrylamides, such as, for example, acrylamido-propyltrimethylammonium chloride (APTAC); and acidified or quaternized salts of dialkylaminoalkylmethacrylamides, such as, for example, methacrylamido-propyltrimethylammonium chloride (MAPTAC).
    [0017] The acidified salts are obtained by the means known to those skilled in the art, and in particular by protonation. The quaternized salts are also obtained by means known to those skilled in the art, in particular by reaction with benzyl chloride, methyl chloride (MeC1), aryl chlorides, alkyl, or dialkyl sulphates such as dimethyl sulfate. According to a preferred embodiment, the cationic monomer is chosen from diallyldialkyl ammonium salts such as diallyl dimethyl ammonium chloride (DADMAC); acidified or quaternized salts of dialkylaminoalkylacrylamides or methacrylamides, such as, for example, methacrylamido-propyltrimethylammonium chloride (MAPTAC), acrylamido-propyltrimethylammonium chloride (APTAC). Particularly preferred are diallyl dimethyl ammonium chloride (DADMAC), methacrylamido propyl trimethyl ammonium chloride (MAPTAC) and acrylamido propyl trimethyl ammonium chloride (APTAC). DADMAC is even more particularly preferred. One or more cationic monomers can be used for the manufacture of the amphoteric polymer according to the invention. The total amount of cationic monomer is between 0.2 and 6 mol%. When this unit is used, it corresponds to the molar percentage of cationic monomer relative to the total number of moles of monomers used to make the polymer. According to a preferred embodiment, the total amount of cationic monomer is greater than or equal to 0.5 mol%. It is also preferably less than or equal to 5 mol%.
    [0018] When the single cationic monomer is DADMAC, its amount is preferably between 1 and 5 mol%, preferably between 3 and 5 mol%.
    [0019] When the single cationic monomer is either APTAC or MAPTAC, its amount is preferably between 0.5 and 3 mol%, preferably between 0.5 and 2 mol%.
    [0020] The nonionic monomer (s) are preferably selected from the group consisting of acrylamide; methacrylamide; N-mono-derivatives of acrylamide, for example N-isopropylacrylamide; N-mono-derivatives of methacrylamide; N, N derivatives of acrylamide, for example N, N-dimethylacrylamide; N, N derivatives of methacrylamide; acrylic esters; methacrylic esters; N-vinylformamide; and N-vinylpyrrolidone. The particularly preferred nonionic monomer is acrylamide. The polymer according to the invention preferably comprises a quantity of nonionic monomers of at least 30% by mole, preferably at least 45% by mole. The anionic monomer or monomers are preferably selected from the group consisting of monomers having a carboxylic function; and their salts; monomers having a sulfonic acid function and their salts; monomers having a phosphonic acid function and their salts. They are, for example, acrylic acid; methacrylic acid; itaconic acid; crotonic acid; maleic acid; fumaric acid; 2-acrylamido-2-methylpropanesulfonic acid, vinylsulfonic acid, vinylphosphonic acid, allylsulfonic acid, allylphosphonic acid or styrenesulfonic acid; and their corresponding water-soluble salts. The water-soluble salts of the above anionic monomers are typically salts of an alkali metal, an alkaline earth metal and ammonium. Particularly preferred anionic monomers are acrylic acid, 2-acrylamido-2-methylpropanesulfonic acid and their corresponding salts.
    [0021] The polymer according to the invention preferably comprises an amount of anionic monomers of between 10 and 70 mol%, more preferably between 25 and 55 mol%.
    [0022] The hydrophobic monomers can also be used in the preparation of the water-soluble polymer used in the process of the invention. They are preferably selected from the group consisting of esters of (meth) acrylic acid having an alkyl, arylalkyl or ethoxylated chain; (meth) acrylamide derivatives having an alkyl, arylalkyl or dialkyl chain. When a monomer having a hydrophobic character is used for the preparation of the water-soluble polymer, its amount is in the range of 0.001 to 3 mol% relative to the total amount of monomers.
    [0023] The molecular weight of the polymer according to the invention is preferably between 3 and 40 million g / mol and more preferably between 5 and 30 million g / mol. The water soluble polymer may also be branched. The branching may preferably be carried out during the polymerization of the monomers in the presence of a branching / crosslinking agent or optionally a polyfunctional transfer agent. A non-exhaustive list of branching / crosslinking agents includes: methylene-bis-acrylamide (MBA); ethylene glycol diacrylate; polyethylene glycol dimethacrylate; vinyloxyethyl acrylate; vinyloxyethyl methacrylate; triallylamine, glyoxal; glycidyl ether type compounds such as ethylene glycol diglycidyl ether; compounds having at least one epoxy function; trimercaptotriazine, polyvinyl alcohols, polyvinylamines. The amount of branching agent / crosslinking in the monomer mixture is less than 4% by weight based on the monomer content. The polymerization process can be carried out according to any of the polymerization techniques well known to those skilled in the art: solution polymerization, suspension polymerization, gel polymerization, precipitation polymerization, emulsion polymerization. (Aqueous or inverted) followed or not by a spray drying step, suspension polymerization, micellar polymerization followed or not by a precipitation step. Post-hydrolysis or co-hydrolysis of the polymer of the invention is possible as is known to those skilled in the art. The polymerization is generally free radical polymerization, preferably by reverse emulsion polymerization or gel polymerization. By free radical polymerization, we include free radical polymerization by means of UV, azo, redox or thermal initiators as well as controlled radical polymerization (CRP) techniques or matrix polymerization techniques.
    [0024] As already mentioned, the invention relates to a method of treating suspensions of solid particles in water. It involves mixing the suspension with the water-soluble polymer of the invention.
    [0025] Such treatment can be carried out in a thickener, which is a holding zone, generally in the form of a section of a tube of a diameter of several meters with a conical bottom in which the particles can sediment. According to a specific embodiment, the aqueous suspension is transported by means of a pipe to a thickener, the polymer is added to said pipe.
    [0026] According to another specific embodiment, the polymer is added in a thickener which already contains the suspension to be treated. In a typical mineral processing operation, the suspensions are often concentrated in a thickener. This results in a higher density slurry exiting the bottom of the thickener, and an aqueous fluid released from the treated slurry (referred to as liquor) that exits overflow from the top of the thickener. The addition of the polymer increases the concentration of the sludge and increases the clarity of the liquor. According to another specific embodiment, the polymer is added to the particle suspension during transport of said suspension to a deposition zone. Preferably, the polymer is added to the pipe which transports said suspension to a deposition zone. It is on this deposition zone that the treated slurry is spread 3032700 for dehydration and solidification. The deposition zones may be unclosed, such as an undefined soil area, or closed such as a pond, a cell.
    [0027] An example of these treatments during the transport of the suspension is the spreading of the slurry treated with the polymer according to the invention on the soil with a view to its dehydration and its solidification then the spreading of a second layer of suspension treated. on the first solidified layer. Another example is the continuous spreading of the suspension treated with the polymer according to the invention so that the treated suspension falls continuously on the suspension previously discharged into the deposition zone, thus forming a mass of treated materials whose water is extracted. In another specific embodiment, the water-soluble polymer is added to the suspension, and then mechanical treatment is performed, such as centrifugation, pressing, or filtration. The water-soluble polymer can be added simultaneously in different stages of the suspension treatment, ie for example in the pipe carrying the suspension to a thickener and in the mud coming out of the thickener which will be driven either to a deposition zone or to a mechanical treatment device.
    [0028] The polymer may be added in liquid form or in solid form. The polymer may be added as an emulsion, (water in oil), a suspension, a powder or a dispersion of the polymer in oil. The polymer is preferably added in the form of an aqueous solution.
    [0029] When the polymer is in solid form, it may be partially or completely dissolved in water using a polymer preparation unit such as the Polymer Slicing Unit disclosed in the document. EP 2 203 245.
    [0030] According to another specific embodiment, the water-soluble polymer is added to the suspension in combination with another synthetic or natural polymer. These polymers can be added simultaneously or separately. The other polymer may be water soluble or swellable in water. It can be a dispersant, a coagulant or a flocculant. According to another specific embodiment, the polymer according to the invention is added to the suspension in combination with a salt such as calcium and / or magnesium salts. The polymer and the salt can be added simultaneously or separately.
    [0031] The salts may be inorganic or organic. Suitable salts include calcium chloride, calcium acetate, calcium sulfate, calcium nitrate, calcium hydroxide, calcium carbonate, magnesium chloride, magnesium acetate, sodium sulfate, and the like. magnesium, magnesium nitrate, magnesium hydroxide, magnesium carbonate, calcium formate, calcium gluconate, calcium propionate, tricalcium phosphate and calcium succinate. According to the invention, the amount (dosage) of polymer added is between 50 and 5000 g per ton of dry solids of the suspension, preferably between 250 and 2000 g / t and more preferably between 500 and 1500 g / t, in depending on the nature and the composition of the suspensions to be treated. According to the invention, the process using the polymer described in the invention makes it possible to effectively treat a suspension of solid particles and more particularly of mineral particles.
    [0032] Suspensions of solid particles in water include all types of sludge, residues or waste materials. The suspensions come more particularly from the extraction of ores and are in the form of suspensions of mineral particles. They may, for example, be sludges or industrial residues and all mine washing and scrapping products from mining, such as coal mines, diamond mines, phosphate metal mines (aluminum, platinum, iron, gold, 3032700 12 copper, silver, etc ....). The suspensions may also come from the extraction of bituminous sand, for example sludge or extraction residues derived from the bituminous sand treatment. These suspensions generally comprise organic and / or mineral particles, such as, for example, clays, sediments, sand, metal oxides, petroleum, etc., mixed with water. Generally, the suspensions of solid particles are concentrated and contain between 5% and 60% by weight solids, preferably between 20 and 50% by weight solids, relative to the total weight of said suspensions. The process according to the invention is particularly useful for the treatment of residues resulting from the extraction of bituminous sand: residues known as "fine" or "fine tailings", that is to say containing a large amount of clays, and for the treatment of so-called "mature" fine residues, Mature Fine Tailings (MFT), that is to say, these fine residues after a few years of sedimentation, and containing an even larger amount of clays. The method according to the invention can also be used to treat so-called "fresh" residues, that is to say leaving directly the separation operation of the bitumen and the soil from which it is extracted.
    [0033] According to one particular embodiment of the invention, the aqueous suspension of solid particles is a so-called "mature" fine residue, that is to say a Mature Fine Tailing (MIT), derived from the extraction of bituminous sand. . The treatment of oil sands has recently become a growing problem in Canada. Residue scrap is sent to tailings ponds or thickeners for subsequent water management. Oil sands residues are alkaline aqueous suspensions that contain unrecovered residual bitumen, salts, soluble organic compounds, sands and clays. The residues are discharged to tailings ponds for storage.
    [0034] 30 3032700 13 Tailings ponds are tightly regulated by the Canadian government. It takes two to four barrels of water per barrel of oil produced by the oil sands process. As the slurry of residues is discharged to the tailings ponds, coarse solid particles such as sand separate by gravity, while water and fine solid particles, such as clays, remain as slurries in the pond. residues. A mature fine tailings layer (MIT) develops after two to three years. ITMs are consolidating very slowly. It is estimated that the process of complete sedimentation without any treatment lasts almost a century.
    [0035] The use of the polymer described in the invention makes it possible to treat MFT in a few days only. They increase drainage, water release and general dehydration of MFTs. They also improve the mechanical properties of the materials obtained after separation of the water and the clarity of the released aqueous fluid (also called liquor), which allows the reuse of the clarified water and its immediate provision for recirculation in the water. industrial plant typically for the bitumen separation step of the soil from which it is extracted. The following examples are given by way of illustration of the object of the invention without limiting it in any way. EXAMPLE 1 Preparation of the Polymer A 1.5 liter reactor equipped with a mechanical stirrer, a thermometer and a nitrogen inlet is charged with distilled water, acrylamide (AM), acid acrylic (AA) and cationic monomer according to the following composition: Acrylamide: (70 - X) mol% Acrylic acid: 30 mol% Cationic monomer: X mol% Different cationic monomers were tested, and for each between them their X concentration was varied.
    [0036] The mixture obtained is homogenized and then cooled, neutralized with sodium hydroxide to pH = 7.6-7.7 and finally degassed under a stream of nitrogen. The polymerization is then initiated using a redox system (initiator). The resultant gel obtained after polymerization is then milled and dried in a drying oven so as to obtain a powder. The various polymers prepared are all water-soluble polymers of high molecular weight between 10 and 12 million g / mol. They are listed in Table 1 below: Polymer Cationic monomer Mol% X none 0 A APTAC 0.5 B APTAC 1 C APTAC 1.5 D APTAC 2 E APTAC 3 F APTAC 5 G APTAC 7.5 H MAPTAC 0.5 I MAPTAC 1 J MAPTAC 1.5 K MAPTAC 2 L MAPTAC 3 M MAPTAC 5 N MAPTAC 7.5 O DADMAC 0.5 P DADMAC 1 Q DADMAC 1.5 R DADMAC 2 S DADMAC 3 T DADMAC 5 U DADMAC 7.5 10 Table 1: Nature and concentration of cationic monomer per polymer APTAC: acrylamido-propyltrimethyl ammonium chloride MAPTAC: methacrylamido-propyl trimethyl ammonium chloride DADMAC: diallyl dimethyl ammonium chloride 3032700 EXAMPLE 2 - Flocculation of sludge 1 (MIT 1). Polymers X and A to U are dissolved in tap water to obtain aqueous solutions having a concentration of 0.4% by weight of polymer based on the total weight of the solution. All these solutions are stirred mechanically at 500 rpm until the complete solubilization of the polymers and obtaining clear and homogeneous solutions. The flocculation tests are carried out on a suspension of mature fine residues (MIT) derived from the extraction of oil sands with a solids content of 33.7% by weight. For each test, the appropriate volume of polymer solution is added to 200 g of MIT and then the whole mixture is mixed manually until optimum flocculation and water release is observed. The results are summarized in Table 2 below: Released water (m), Polymer dosage 30 min lh 24 h LNE 24h Polymer (kg / dry tonne) X 1.14 12.9 15.6 22 2 A 1.14 19 22.2 28.6 8.6 B 1.19 19.3 22.9 29.9 8.9 C 1.31 18.6 23.4 32.3 9.3 D 1.42 19.1 23.4 32.3 9.3 E 1.65 24.6 29.3 34.9 5.9 E 2.16 28.7 34.8 43 5 G No flocculation whatever the dosage H 1.14 17.8 22.9 27.2 7.2 I 1.14 18.8 23.1 28.2 8.2 J 1.19 15.4 21.2 27.6 6.6 K 1.31 19.2 24.0 29.4 6.4 L 1.42 20.6 25.5 31.4 6.4 M 1.76 22.5 28.3 36.3 5.3 N 3.70 56.3 61.2 66.5 1.5 0 1.14 13.2 17.3 25 5 P 1.14 17.1 20.9 28.7 8.7 Q 1.19 18.7 22.8 30.4 9.4 R 1.19 19.9 23.3 28.8 7.8 S 1.31 25.3 29 35.1 12.1 T 1.48 26.7 30.9 37.6 11.6 U 1.99 27.9 32.7 40.8 5.8 Table 2 - Polymer A to U performance in terms of the net release of water in the MFT 1.
    [0037] 3032700 16 LNE = Net Release of Water. It corresponds to the total amount of water recovered during the flocculation test minus the amount of water unduly added during the incorporation of the aqueous polymer solution in the suspension.
    [0038] The results of these experiments clearly show that the presence in the amphoteric polymer of 0.5 mol% of MAPTAC monomer, or APTAC or DADMAC makes it possible to improve the quantity of water released compared to the anionic polymer X. This performance is improved by increasing still the amount of cationic monomer, up to a certain concentration of between 6 and 7 mol%, above which the performances decrease significantly. An excessive dosage of polymer may be problematic for an industrial application for which the user will wish to optimize its polymer consumption. EXAMPLE 3 Flocculation of Sludge 2 (MFT 2)
    [0039] Polymers X and A to U are dissolved in tap water to obtain aqueous solutions having a concentration of 0.4% by weight of polymer based on the total weight of the solution. All these solutions are stirred mechanically at 500 rpm until the complete solubilization of the polymers and obtaining clear and homogeneous solutions. The flocculation tests are carried out on a second suspension of mature fine residues (MFT) derived from the extraction of oil sands with a solids content of 35.1% by weight.
    [0040] For each test, the appropriate volume of polymer solution is added to 200 g of MIT and then the whole mixture is mixed manually until flocculation and optimized water release are observed.
    [0041] The results are summarized in Table 3 below: Released water (ml), polymer dosage 30 min lh 24 h LNE 24h Polymer (kg / dry tonne) X 1.06 10.8 15 22.2 2.2 A 1.06 14.8 19.9 26.7 6.7 B 1.11 17.2 21.4 30.1 9.1 C 1.16 15.5 20.8 29.4 7.4 D 1.27 19.8 25.5 32.3 8.3 E 1.43 23.0 29.6 36.1 9.1 F 1.80 22.4 29.4 37.5 3.5 G No flocculation whatever the dosage H 1.11 16.1 20.4 26.9 5.9 I 1.11 16.4 19.9 26.8 5.8 J 1.16 14.8 22.0 28.2 6.2 K 1.22 15.3 21.3 30.4 7.4 L 1.37 19.7 25.1 33.5 7.5 M 1.80 22.9 35.2 37.8 3.8 N 3.81 54.6 63.8 73.1 1.1 0 1.00 13.0 17.8 26.6 7.6 P 1.06 13.5 19.2 28.0 8.0 Q 1.06 14.8 18.9 28.3 8.3 R 1.11 16.4 20.7 29.7 8.7 S 1.16 15.8 21.0 29.2 7.2 T 1.37 19.7 28.0 34.6 8.6 U 1.85 25.4 29.5 39.1 4.1 Table 3 - Performance of polymers A to U in terms of the net release of water in MIT 2.
    [0042] The results of these experiments show for a second suspension of the MFT type, the presence in the amphoteric polymer of 0.5 mol% of MAPTAC monomer, or APTAC or DADMAC makes it possible to improve the quantity of water released relative to the anionic polymer X. This performance is improved by further increasing the amount of cationic monomer up to a certain concentration of between 6 and 7 mol%, above which the performance decreases significantly.
    权利要求:
    Claims (5)
    [0001]
    CLAIMS1 / A method of treating an aqueous suspension of solid particles, comprising the following steps: - a water-soluble polymer is prepared comprising: o at least one nonionic monomer; at least one anionic monomer; at least one cationic monomer representing between 0.2 and 6 mol%; said water-soluble polymer is added to the aqueous suspension of solid particles.
    [0002]
    2 / A method according to claim 1, characterized in that the amount of cationic monomer is between 0.5 and 5 mol%.
    [0003]
    3 / A method according to claim 1 or 2, characterized in that the cationic monomer is selected from the group consisting of diallyldialkyl ammonium salts; acidified or quaternized salts of dialkylaminoalkyl acrylates; acidified or quaternized salts of dialkylaminoalkyl methacrylates; acidified or quaternized salts of dialkylaminoalkylacrylamides; and acidified or quaternized salts of dialkylaminoalkymethacrylamides.
    [0004]
    4 / A method according to one of claims 1 to 3, characterized in that the cationic monomer is selected from diallyl dimethyl ammonium chloride (DADMAC), methacrylamido-propyl trimethyl ammonium chloride (MAPTAC) and acrylamidopropyl trimethyl ammonium 25 chloride (APTAC).
    [0005]
    5 / A method according to one of claims 1 to 4, characterized in that the cationic monomer is diallyl dimethyl ammonium chloride (DADMAC). 6. The process according to one of claims 1 to 5, characterized in that the nonionic monomer is selected from the group consisting of acrylamide; methacrylamide; N-mono-derivatives of acrylamide; N-mono-derivatives of methacrylamide; N, N derivatives of acrylamide; N, N-derivatives of methacrylamide; acrylic esters; methacrylic esters; N-vinylformamide; and N-vinylpyrrolidone. 7. The process as claimed in one of claims 1 to 6, characterized in that the polymer comprises a quantity of nonionic monomers of at least 30 mol%. 8 / A method according to one of claims 1 to 7, characterized in that the anionic monomer is selected from the group consisting of the monomers having a carboxylic function and their salts; monomers having a sulfonic acid function and their salts; monomers having a phosphonic acid function and their salts. 9 / A method according to one of claims 1 to 8, characterized in that the polymer 10 comprises an amount of anionic monomers of between 10 and 70 mol%. 10 / A method according to one of claims 1 to 9, characterized in that the polymer has a molecular weight between 3 and 40 million g / mol. 11 / A method according to one of claims 1 to 10, characterized in that a quantity of polymer of between 50 and 5000 g per ton of dry solids of the suspension is added. 12 / A method according to one of claims 1 to 11, characterized in that transported by means of a pipe the aqueous suspension to a deposition zone and that the polymer is added in said pipe. 13 / A method according to one of claims 1 to 12, characterized in that the aqueous suspension of solid particles is from the extraction of ores and consists of a suspension of mineral particles. 14 / A method according to one of claims 1 to 13, characterized in that the aqueous suspension of solid particles comes from the extraction of bituminous sand. 15 / A method according to one of claims 1 to 14, characterized in that the suspension is a MIT from the extraction of oil sand.
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
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    优先权:
    申请号 | 申请日 | 专利标题
    FR1551153A|FR3032700B1|2015-02-12|2015-02-12|PROCESS FOR THE TREATMENT OF SUSPENSIONS OF SOLID PARTICLES IN WATER USING AMPHOTERIC POLYMERS|FR1551153A| FR3032700B1|2015-02-12|2015-02-12|PROCESS FOR THE TREATMENT OF SUSPENSIONS OF SOLID PARTICLES IN WATER USING AMPHOTERIC POLYMERS|
    US15/544,211| US10926200B2|2015-02-12|2016-01-28|Method for treating suspensions of solid particles in water using amphoteric polymers|
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    AU2016217729A| AU2016217729B2|2015-02-12|2016-01-28|Method for treating suspensions of solid particles in water using amphoteric polymers|
    PCT/FR2016/050174| WO2016128638A1|2015-02-12|2016-01-28|Method for treating suspensions of solid particles in water using amphoteric polymers|
    CN201680007344.2A| CN107531522B|2015-02-12|2016-01-28|Method for treating an aqueous suspension of solid mineral particles resulting from ore extraction|
    CA2973554A| CA2973554A1|2015-02-12|2016-01-28|Method for treating suspensions of solid particles in water using amphoteric polymers|
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