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Method of extracting gold from alkaline cyanide solutions Invention relates to a method of extracting gold, particularly sorption of gold from aqueous cyanide solutions. A method of extracting gold from alkaline cyanide solutions includes contacting aqueous gold cyanide solution with an anionite containing amino groups. To provide sorption at high pH values, water-soluble salts of unsubstituted guanidine are added to the gold solution. Sorption is carried out at molar ratio of gold to guanidine of 1:2÷10. |
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Method of extracting platinum and/or palladium from spent catalysts on aluminium oxide supports Method includes leaching the obtained cinder with a chloride solution, which contains an oxidant or a mixture of oxidants, to extract platinum and/or palladium from the leaching solution. Oxidising roasting of the catalyst is carried out at 500-800°C. Leaching is carried out with saturated aluminium chloride solution in an apparatus with a fixed bed of the product being leached, followed by extraction of platinum and/or palladium from the leaching solution by sorption on an anion-exchange resin. |
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Processing of gold-bearing concentrates of two-fold hardness Prior to feeding into autoclave the concentrate acid pulp produced by the concentrate pre-treatment with acid is mixed with addition of mercury salts. Autoclave leaching is conducted at 225-235°C and terminated upon reaching the pulp redox potential in the range of +700÷730 mV relative to standard hydrogen electrode. As addition mercuric sulphate (II) or mercuric nitrate (I) is used in amount of 5-50 g as recalculated to mercury per 1 t of concentrate. Acid concentrate pulp with mercury salt addition is mixed at room temperature for 0.5-1 h. |
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Complex processing method of residues of domanic formations Invention relates to a processing method of Domanic formations. The method involves agitation neutralisation - decarbonation by treatment with pulp of crushed ore or by a neutraliser of a hardened solution cleaned from aluminium so that a productive solution and decarbonated cake is obtained. Then, a clay product is leached from decarbonated cake in the form of nepheline with the hardened solution so that pulp sulphate is obtained. After that, autoclave oxidation leaching of uranium, vanadium, molybdenum and rare-earth metals is performed from a solid phase of pulp sulphate in presence of substances that oxidise vanadium selectively so that a hardened solution, which contains aluminium, vanadium, uranium, molybdenum and rare-earth metals, and insoluble residue is obtained. Gold and platinum is extracted from the insoluble residue. Potassium aluminium sulphate alum is extracted from the hardened solution. Uranium and molybdenum and vanadium and rare-earth metals are extracted from the productive solution. |
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Improved method for stage eluation of loaded resin Group of inventions relates to isolation of metal ions from liquids, suspensions or pulps. Contact of liquids, suspensions or pulps with resin, removing several metals is carried out in several successive tanks with mixer with obtaining loaded resin. Loaded resin is transferred into eluation column, eluent is added into eluation column from the top and passed through loaded resin with removal of several metals from loaded resin. Eluate from eluation column, which contains several metals, is passed though enrichment column, located successively relative to eluation column; eluate is separated in form of separate fractions with separation of several metals from each other. Device for realisation of said method is also claimed. |
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Method of extracting rare earth elements from extraction phosphoric acid Invention relates to a method of extracting rare earth elements (REE) from extraction phosphoric acid (EFA). The method includes the application of an anionite of a phosphate-mixed form in a cyclic process of sorption-desorption. Desorption at all, except the last, stages-cycles is carried out until a ratio of initial (C0) and final (C) concentrations of the acid corresponds to the condition 0.25≤C/C0≤0.75, and at the last one until the concentration of desorbed phosphoric acid is not more than 0.15 mol/l. Passing of EFA through a column with an anionite is carried out at each stage of the cycle from bottom to top to a breakthrough, corresponding to a relative concentration, corresponding to the condition 0.25≤C/C0≤0.75. An obtained enriched in REE solution is directed to the extraction of a solid REE concentrate. Desorption at each stage of the cycle is carried out with diluted phosphoric acid with obtaining at all, except the last one, stages-cycles of a purified phosphoric acid desorbate and a last stage-cycle desorbate - with a relative concentration of phosphoric acid, corresponding to the condition 0.25≤C/C0≤0.75, and with the concentration lower than 0.25 mol/l. The latter is returned to the desorption stage. |
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Method of producing scandium-bearing concentrate from red mud Invention relates to extraction of scandium oxide from red mud wastes of alumina production. This process comprises leaching said red mud by carbonate solutions at gassing of slime pump by gas-air mix containing CO2. Pulp is filtered out to produce scandium-bearing solution to separate scandium, from impurities. Scandium compounds are deposited from purified solution. Scandium concentrate is filtered out, flushed dried. Red mud leaching is performed, first, by initial vibration cavitation of pulp. Scandium is separated from impurities by sorption with phosphate ionites. Scandium is desorbed from ionite organic phase by mixed carbonate-chloride solutions in pulse mode to get scandium-bearing eluate. The latter is subjected to stepwise deposition of scandium marginally soluble compounds. Note here that, first, impurities, are deposited to separate the precipitate that represents a titanium-zirconium concentrate. Now, scandium concentrate is deposited. |
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Method of separating platinum (ii, iv), rhodium (iii) and nickel (ii) in chloride solutions Method of separating platinum (II, IV) and rhodium (III) from nickel (II) in chloride solutions includes sorption of platinum (II, IV) and rhodium (III) and further desorption of the said metals. Sorption is carried out from freshly prepared and mature solutions in dynamic conditions by passing the solution through a layer of strongly basic anionite Purolite A 500 or weakly basic complex-forming anionite Purolite S 985, containing polyamine functional groups. Complete transfer of platinum (II, IV) and rhodium (III) into anionite takes place, with nickel (II) remaining in a discharged solution. |
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Method of extracting rare earth elements from extraction phosphoric acid Invention relates to a method of extracting a concentrate of rare earth elements (REE) from extraction phosphoric acid. Extraction phosphoric acid with the concentration of 27-45 wt %, which contains REE and thorium, is passed through sulphoxy cationite with formation of a REE-depleted thorium-containing phosphate solution and cationite, saturated with REE. In the process of passing phosphoric acid through sulphixy cationite thorium concentration in the REE-depleted phosphate solution, which twice becomes equal to its concentration in initial phosphoric acid, is fixed. When the concentration of thorium in the REE-depleted solution for the second time becomes equal to its concentration in initial phosphoric acid, cationite is considered to be REE-saturated and passing of phosphoric acid through it is stopped. Saturated cationite is washed with water. Then desorption of REE by a solution of ammonium sulphate or nitrate with the concentration of 275-300 g/l is carried out and from the obtained desorbate a non-radioactive REE concentrate is performed. |
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Extraction of fine gold from argillaceous sediments Invention relates to concentration of minerals and can be used for extraction of fine gold from argillaceous sediments. This method comprises preparation of suspension of argillaceous sediments, trapping of fine gold from said suspension by introduction of vegetable material-based sorbent premixed to 0.3 mm grain size in suspension and mixing. Then, sorbent is flushed through 0.3 mm mesh screen, dried and subjected to assay fusion. Note here that suspension is prepared at S:L ratio of 1:25. Sorbent is added to suspension activated in mixer to homogeneous state for 3-5 minutes and, then, mixed for 30-40 seconds. After sorption, loose flakes bearing gold are flushed. |
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Method of extracting silver ions from low-concentration silver nitrate solutions Method includes passing the solution through polymer fibre for sorption of silver ions. After passing the solution, silver ions contained in the fibre are reduced to a metal state with 0.02 M aqueous solution of a mixture of ascorbic acid with glucose in ratio of 1:9. Silver metal is then extracted by burning the silver-containing fibre in an air atmosphere at temperature of 450-500°C, followed by washing the formed silver reguli. |
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Method of extracting rhenium from uranium-containing solutions Invention relates to sorption hydrometallurgy of uranium and rhenium and can be used to extract rhenium from solutions and pulp. The method of extracting rhenium from uranium-containing solutions includes sorption of rhenium on anions. Before sorption, fulvic acids are added to the solution until concentration thereof in the solution reaches 25-300 mg/l. Rhenium sorption is carried out at solution pH 2.8-3.5. Sorption is carried out on weakly basic and strongly basic anionites. |
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Method of processing phosphogypsum for production of concentrate of rare earth metals and gypsum Method includes preparation of phosphogypsum pulp, leaching rare earth metals (REM) and phosphorus with sulphuric acid. After that, pulp is separated into REM and a phosphorus-containing solution and gypsum in the form of insoluble sediment, its neutralisation and REM sorption with cationite from the solution with obtaining mother liquor. After that, REM desorption is performed with obtaining a strippant and separation of REM concentrate from the strippant. Stage leaching is performed in the method, with supply of phosphogypsum to each stage and sulphuric acid to the first stage. Before neutralisation gypsum is subjected to water washing with obtaining a washing solution, supplied to REM sorption with cationite. Sorption mother liquor is divided into two parts, one of which is used to prepare phosphogypsum pulp, with precipitation of phosphorus and fluorine with basic calcium compound from the second one. The obtained sediment is separated from water phase and supplied to utilisation, and water phase is used in circulation. |
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Method of extracting uranium from mother liquors Invention relates to method of uranium extraction from mother liquors. Method includes obtaining resin, modified by aminophosphonic groups, and obtaining mother liquor, which contains from 25 to 278 g/l of sulphate and uranium. After that, mother liquor is passed through resin, modified by aminophosphonic groups, in acid form to separate uranium from mother liquor. Then, elution of uranium from resin is realised. |
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Method of producing vanadium pentoxide from vanadium-containing slag Invention relates to extraction of pure vanadium pentoxide from slag obtained during production thereof. The method involves taking ground vanadium-containing slag, fusion thereof with sodium hydroxide to obtain sodium metavanadate. The sodium metavanadate is then leached with water and the solution is separated from the solid phase. The obtained solution is then mixed with an inorganic acid to achieve pH≤4 and a sorbent is added, the sorbent used being powdered coal which is modified with cation-active nitrogen-containing surfactants. After the sorption process, the spent sorbet is separated from the liquid phase, dried and calcined at temperature of 600-640°C to obtain pure vanadium pentoxide. The cation-active nitrogen-containing surfactants used are, for example, lauryl dimethylbenzyl ammonium chloride, cetylpyridinium chloride and polyhexamethylene guanidine hydrochloride. |
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Sorption extraction of iron ions from acidic chloride solutions Sorption extraction of iron ions from acidic chloride solutions relates to extraction of substances using sorbents and can be used in non-ferrous and ferrous metallurgy and for treating industrial and household wastes. Iron ions are extracted by sorption on anionites of chloride solutions, saturated with chlorides of alkali and alkali-earth metals at temperature of 70-80°C. Sorption is carried out on anionites selected from: AMP, containing exchange groups , and AM-2b, containing exchange groups − C H 2 − N ( C H 3 ) 2 , − C H 2 − N + ( C H 3 ) 3 . |
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Sorption extraction of cobalt ions from acidic chloride solutions Invention relates to sorption extraction of cobalt ions Co2+ from acidic chloride solutions and can be used in non-ferrous and ferrous metallurgy, as well as in treatment of industrial and household wastes. Co2+ ions are sorbed from chloride solutions containing ammonium chloride or alkali or alkali-earth metal chlorides on anionites selected from: AMP, containing exchange groups or AM-2b, containing exchange groups wherein the technical result is finding optimum conditions for sorption of cobalt ions on anionites. |
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Method for extraction of gallium from fly ash Method involves fly ash crushing, removal of Fe by magnetic separation; then, its dilution in a hydrochloric acid so that a hydrochloric leaching product is obtained. Then, adsorption of gallium contained in the hydrochloric leaching product is performed by means of macroporous cationic resin with further production of eluent containing gallium; addition of sodium hydroxide solution to the eluent for carrying out the reaction and obtaining a sodium metaaluminate solution containing gallium. Then, CO2 is added to the sodium metaaluminate solution containing gallium for carbonisation with further separation of gallium from aluminium and production of double aluminium-gallium salt at the gallium to alumina weight ratio comprising more than 1:340. Then, double aluminium-gallium salt is added to sodium hydroxide so that an alkali solution containing gallium and aluminium is obtained, and an electrolysis of the alkali solution containing gallium and aluminium is performed so that metallic gallium is obtained. |
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Method for extraction of gallium from fly ash Invention refers to a method for extraction of gallium from fly ash. The method involves crushing of fly ash and extraction of Fe by magnetic separation. Then, it is diluted with hydrochloric acid so that hydrochloric-acid leaching product is obtained, gallium is adsorbed by means of macroporous cationic resin, and further elution is performed so that a gallium-containing eluent is obtained. Then, a masking agent is added for masking of a trivalent iron ion so that a gallium-containing eluent is obtained. After masking is completed, gallium is adsorbed in the eluent by means of macroporous cationic resin with further elution and production of the secondary eluent, solution of sodium hydroxide is added to the secondary eluent for carrying out the reaction, and a deposit is filtered and removed after the reaction is completed. Then, the filtrate is concentrated and an electrolysis is performed so that metallic gallium is obtained. |
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Method for obtaining ammonium tungstate Invention refers to processing of tungsten-containing raw material. Tungsten-containing carbonate solution is subject to thickening by means of flocculant VPK 402 for removal from the solution of such impurities as BO3 3-, PO4 3-, AsO4 3- and SiO3 2. Then, the solution is subject to the first stage of ionic exchange on anionite AB-17-8 in a sulphate shape for removal of a carbonate-ion. At the second stage a tungstate-ion is sorbed. For tungstate desorption a solution containing 50 g/l of (NH4)2SO4 and 200 g/l of NH4OH is used, and for sorption of the carbonate-ion a solution of Na2SO4 with concentration of 190 g/l is used. |
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Extraction method of precious metals from solutions Extraction method of precious metals from solutions involves contact of a solution with a sorbent applied onto a carrier with developed surface. Xanthogenate of non-precious metals, which is applied onto the carrier, is used as a sorbent. A filtering flexible plate material is used as a carrier. Filtering flexible plate material with the applied sorbent is rolled into a coil that is placed into a sorption column and contact is performed by passing initial solution through the coil. |
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Method of recovering molybdate or tungstate from aqueous solutions by adsorption Method of recovering molybdate or tungstate from an aqueous solution, in which molybdate or tungstate is bound from the aqueous solution at pH in the range from 2 to 6 with a water-soluble, cationised inorganic carrier. The saturated carrier is separated and the bound molybdate or tungstate is released once again into aqueous solution at a pH in the range from 6 to 14. The cationised inorganic carrier is bentonite, hectorite or attapulgite which is subjected to ion exchange with tetraalkylammonium ions or quaternised esters of fatty acids and alkanolamines. |
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Method of extraction of rich components from production solutions for processing of black-shale ores Method includes sorption of rich components from production solutions by ion-exchange material counterflow under controlled pH of environment and oxidation-reduction potential Eh. Sorption is performed by ion-exchange materials in stages from production solutions containing uranium, molybdenum, vanadium and rare earth elements. At the first stage uranium and molybdenum are extracted by anion-exchange material sorption. At the second stage vanadium is extracted by anion-exchange material sorption with hydrogen dioxide available at Eh of 750-800 mV, pH of 1.8-2.0 and temperature of 60°C, at that vanadium sorption is performed till complete destruction of hydrogen dioxide and till Eh is below 400 mV. Then barren solutions are transferred to cationite at pH of 2.0-2.5 and Eh of 300-350 mV for extraction of rare earth elements. |
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Gold-bearing pulp from alluvial and ores is prepared, absorbent based on liquid hydrocarbons is used. Density of this absorbent is lower than density of the pulp. Then pulp contacts absorbent, during this process free gold transfers from pulp to absorbent. Free gold is extracted from absorbent by absorbent filtration in filter press. Volumetric contact of pulp with absorbent is performed due to pulp filtration in downward direction through at least one layer of absorbent, at that used absorbent has oxidation-reduction potential (Eh) not less than +1400 mV and is characterised by adhesion value to free gold not less than 40 Pa. Process efficiency of production plant for filtration-absorption extraction of gold from gold-bearing pulp is 800-1000 m3/day. |
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Method of extracting rare-earth metals from phosphogypsum Method includes leaching of rare-earth metals (REM) from phosphogypsum with 1-5% solution of sulphuric acid, REM sorption from leaching solution with cationite, REM desorption, precipitation of REM concentrate from desorbate, obtaining REM concentrate and mother liquor, which is used for REM desorption. Cationite after desorption is returned at sorption stage. Phosphor and fluorine are precipitated from mother liquor, phosphor -and fluorine-containing sediment are filtered and filtrate is used as return water in leaching. REM leaching and sorption are carried out simultaneously. Obtained pulp is filtered through mesh filter with separation of saturated REM cationite. After that, pulp is filtered with obtaining non-dissoluble residue and mother liquor of sorption. Before desorption cationite is treated with part of desorbate. |
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Extraction method of gold from ores and products of their processing Extraction method of gold from ores and products of their processing involves preparation of pulp of crushed initial raw material, alkalisation of prepared pulp till pH value is 9.5-10.0, sorption leaching of gold with weak-basic anion-exchange resin from alkalised pulp containing sodium cyanide. Then, by means of separation of saturated anion-exchange resin there performed is gold resaturation of saturated anion-exchange resin with separation of resaturated anion-exchange resin and mother solution. After resaturation is completed, gold desorption is performed by means of a solution containing 25-30 g/l of sodium cyanide and 3-4 g/l of sodium hydroxide so that demetallised anion-exchange resin and marketable strippant is obtained. Some part of marketable strippant is supplied for gold resaturation stage of saturated anion-exchange resin, demetallised anion-exchange resin and some part of mother solution is supplied for stage of sorption leaching of gold, and the other part of mother solution is supplied for preparation of desorbing solution. |
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Method for obtaining gold from fine rock Method involves treatment of rock with a sodium cyanide solution with formation of dispersion of rock particles with gold compound in the form of Na[Au(CN)2], which is dissolved in it. Then, particles are removed from the dispersion so that clarified solution of gold compound is obtained. Clarified solution contacts a solid zinc source so that their products are obtained as a result of reactions of ionic exchange and replacement in the form of water solution of zinc compound Na2[Zn(CN)4] and solid phase of gold. Solid phase of gold is separated and processed so that metal gold is obtained. As zinc source there used are particles of zinc hydroxide consisting of a composite sorbent dispersed in water, consisting of cellulose fibres with particles of zinc hydroxide, which are immobilised with them at their chemical deposition. Solid phase of gold is extracted in the form of its hydroxide. |
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Method involves use of an unbalanced solution consisting of a solution from the washing process of anionite from the acid and filtrate from the filter press, and their removal from the process together with a mother solution from deposition of natural uranium concentrate through an additional saturation operation together with a marketable reclaimed product. For that purpose, the plant includes a local solution recirculation circuit in the form of a collector for solutions of unbalanced and mother concentrate from deposition, which is connected to pipelines of the above solutions and equipped with solution supply pipelines attaching the collector through a gravity tank to an additional saturation column from the marketable reclaimed product and to a solution return pipeline attaching the gravity tank to the solution collector of the local solution recirculation circuit. |
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Extraction line of precious metals from cyanide solutions and/or pulps as per a coal-absorption technology includes a plant for metal sorption from solutions and/or pulps, a plant of secondary metal concentration, a plant for metal desorption and a plant of electrolytic metal extraction, which are installed in the technological process flow and connected to each other via transport pipelines. In addition, the line includes the plant for secondary metal concentration, which is arranged before the metal desorption plant. Besides, the secondary metal concentration plant with a pipeline of rich eluate is connected to the outlet as to eluate of the metal desorption plant, and with the coal feeding system it is connected to the input as to coal of the metal desorption plant. The metal desorption plant is connected through the plant for electrolytic metal extraction to the plant for secondary metal concentration with a transportation pipeline of poor eluates, and with a waste coal transportation pipeline it is connected to the plant for metal sorption from solutions and/or pulps. |
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Composition contains a compound of formula (I) |
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Method of producing scandium-bearing concentrate from red mud Proposed method comprises sulfuric acid leaching of scandium from red mud, pulp filtration, scandium sorption from sulfuric acid solutions, desorption from organic phase by carbonate solution to obtain column effluent. Then, scandium poorly soluble compounds are precipitated from column effluent, precipitate is filtered out, flushed, dried and annealed to get scandium-bearing concentrate. Note here that said leaching is performed by 10.0-13.5%-sulfuric acid at pulp initial vibration cavitation at rotary velocity of 35-60 m/s for 15-35 min. Scandium is precipitated from column effluent by potassium caprinate in amount of 75-100 g/t of scandium at pH 3.5-4.5 and exposure for 15-25 min. |
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Method of extracting rare-earth metals from technological and productive solutions and pulps Method of extracting rare-earth metals from solutions containing iron (III) and aluminium comprises sorption of rare-earth metals on sorbent. Ampholyte with iminodiacetic functional groups is used as said sorbent. Sorption is carried out after preliminary neutralisation or acidification of solution to pH 4-5 by whatever alkaline or acid agent to add ampholyte in obtained pulp with separation of solid fraction. Sorption is conducted at ampholyte:pulp ratio of 1:50-1:150, phase contact time of 3-6 h and in the presence of reducing agent. |
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Method for extraction and separation of platinum and rhodium in sulphate solutions Proposed method involves conversion of platinum metals to actively sorbed sulphate-chloride form and sorption on strong-basic anion-exchange resin. At that, sulphate solutions of platinum and rhodium, which were prepared in advance and exposed during three months, are subject to conversion of platinum metals to active sorbed form by adding to them of a hydrogen chloride acid. Sorption is performed under dynamic conditions from obtained solutions on anion-exchange resin Purolite A-500, which contains tetradic ammonium base as a functional group with further desorption in two stages. At the first stage, solution 2M NaNO3 is passed through anion-exchange resin to extract platinum, and at the second stage, solution 2 M HCl is passed through the above anion-exchange resin to extract rhodium. The method does not require any additional regeneration of a sorbent and is environmentally safe. |
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Method of extracting rare-earth elements from phosphogypsum Invention relates to the technology of producing compounds of rare-earth elements during complex processing of apatites, particularly extraction of rare-earth elements from phosphogypsum. The method involves preparation of pulp from phosphogypsum and sorption of rare-earth elements on a sorbent. The pulp is prepared from ground phosphogypsum and sulphuric acid solution with pH=0.5-2.5 until achieving liquid:solid ratio of 4-7. Sorption is carried out directly from the phosphogypsum pulp on a sorbent with sulphuric acid functional groups for 5-7 hours with solid:sorbent ratio of 4-7. |
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Extraction method of rare-earth metals from phosphogypsum Invention can be used in the technology of obtaining the compounds of rare-earth metals at complex processing of apatites, and namely for obtaining of concentrate of rare-earth metals (REM) from phosphogypsum. Method involves sorption of rare-earth metals. At that, prior to sorption, phosphogypsum is crushed in water so that pulp is obtained in the ratio Solid : Liquid=1:(5-10). Sorption is performed by introducing to the obtained pulp of sorbent containing sulphate and phosphate functional groups, at the ratio of Solid : Sorbent=1:(5-10) and mixing during 3-6 h. |
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Method for extraction of copper and/or nickel from cobalt-bearing solutions Method involves supply of solution with high content of cobalt, which contains cobalt, nickel and copper; sorption by means of contact of the above solution with N-(2-hydroxypropyl)picoline amino resin. Selective elution of cobalt, nickel and copper is performed after sorption by means of continuous gradient acidic elution. At that, pH of the above solution is less than or equal to 2. |
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Method of producing high strength and capacity carbon sorbent Invention relates to a method of producing a carbon sorbent used for extracting rare metals, particularly gold cyanide from aqueous alkaline solutions. The method involves treatment of activated carbon with a polymer with amino groups. Activated charcoal is treated using polyhexamethylene guanidine hydrochloride in form of an aqueous solution. After treatment, alkali is added while stirring and the solution is separated from the carbon. The carbon is saturated with ammonia solution, phenol and formalin. The mixture is held while boiling for 1-5 hours and the carbon separated from the solution is dried at 150-160°C. |
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Method of extraction of rare-earth elements from technological and productive solutions Method for extracting rare-earth elements from the technological and productive solutions containing iron (III) and aluminium, with a pH-0.5÷2.5, includes the sorption of rare-earth elements with strong-acid cation resin. As the strong-acid cation resin the microporous strong-acid cation resin is used based on hypercrosslinked polystyrene having a size of micropores 1-2 nm. |
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Method for gold extraction from cyanide solutions with dissolved mercury contained in them Method for gold extraction from cyanide solutions with dissolved mercury contained in them, gold-bearing ores formed during leaching, involves sorption of gold and mercury on activated carbon with enrichment of activated carbon with gold and mercury. Then, gold desorption is performed with alkali-cyanide solution under autoclave conditions, gold electrolysis from strippants so that cathode deposit is obtained and its remelting is performed so that finished products are obtained in the form of raw base gold alloy. Prior to gold desorption the selective desorption of mercury is performed by treatment of saturated carbon with alkali-cyanide solution containing 15-20 g/l of sodium cyanide and 3-5 g/l of sodium hydroxide, at temperature of 18-20°C and atmospheric pressure during 10 hours. |
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Method of extracting gold using macroporous resins Proposed method comprises preparing leaching solution bearing gold, and gold sorption by macroporous resin containing alkyl amine functional groups in amount of 0.01-1.0 mmol/g and 3-12% of cross-links with water retaining capacity making, at least, 30%, and specific surface area varying from 400 to 1200 m2/g. After sorption, gold is eluted. |
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Method of phosphogypsum processing for manufacture of concentrate of rare-earth elements and gypsum Method of phosphogypsum processing involves leaching of phosphogypsum with sulphuric acid solution with change-over of phosphorus and rare-earth elements to the solution, and gypsum residues is obtained, rare-earth elements are extracted from the solution and the gypsum residue is neutralised with the main calcium compound. In addition, leaching is performed with sulphuric acid solution with concentration of 1-5 wt %. After that, rare-earth elements are extracted from the solution by sorption using sulfocationite in hydrogen or ammonia form with further desorption of rare-earth elements with ammonia sulphate solution. After desorption to the obtained strippant there added is ammonia or ammonium carbonate with deposition and separation of hydroxide or carbon-bearing concentrate of rare-earth elements. Extraction of rare-earth elements of medium and yttrium groups to concentrates is 41-67% and 28-51.4% respectively. Specific consumption of neutralising calcium compound per 1 kg of phosphogypsum has been reduced at least by 1.6 times. |
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Multicolumn sequential extraction of ionic metal derivative Invention may be used in hydrometallurgy. Proposed invention allows separating such metals as uranium, nickel, copper and cobalt present in liquid wastes of ore leaching. Solution containing metal ions is forced through stationary layer of resin, Particularly, through, at least, three zones. Note here that solution drive appliances are arranged between adjacent zones and between last and first zones. Proposed method comprises several sequences, each comprising, at least, one step selected from steps of adsorption, washing and desorption. Every next sequence is performed by shifting fronts into zones downstream of circuit with identical increment unless cyclic shift of inlet and discharge points. |
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Method of ion-exchange uranium extraction from sulfuric solutions and pulps Method includes uranium sorption by anion exchange resin, uranium de-sorption from saturated anion exchange resin by sulphuric acid and obtaining finished product from strippant. Note that uranium de-sorption from saturated anion exchange resin is done by sulphuric acid solution with concentration 70-100 g/l with the presence of 1-2 mole/l of ammonia sulphate. |
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Method of gold extraction from mercury-containing cyanic solutions Method of gold extraction from mercury-containing cyanic solutions consists in sorption by ion-exchange resin of AM-2B mark. Then mercury de-sorption is carried out from saturated ion-exchange resin at a temperature 40-50°C and for 6 hours and aurum de-sorption. Note that mercury de-sorption is done by solution containing sulfuric acid 30-50 g/l with the presence of hydrogen peroxide 5-10 g/l. |
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Extraction method of amount of rare-earth elements from solutions Extraction method of rare-earth elements from solutions containing multiple excess iron (III) and aluminium, with pH=0.5÷2.5 involves sorption using macroporous sulfocationite as sorbent. At that, as sorbent there used is macroporous sulfocationite containing more than 12 to 20% of divinyl benzene. |
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Method for extracting metals from depulped ores Method for extracting metals from depulped ores involves crushing, ore depulping in leached solution and sorption of metal. Leaching is performed in ultrasound pulp cavitation mode. Metal sorption on ion-exchange resin is performed from pulp filtration solution in intensity field of alternating current in sorption activation mode of extracted metal and suppression of sorption of impurities. At that, polarity of electrodes is constantly changed to avoid deposition of metal on cathode. Leaching and sorption of metal is performed in a unit providing solution circulation till the specified completeness of leaching from ore and its complete sorption on ion-exchange resin is achieved. |
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Method for sorption extraction of iron from nitrate salt solutions Invention relates to ion exchange and can be used for sorption extraction of iron from salt solutions formed when processing aluminium-containing material using acid techniques. Extraction of iron to residual content of Fe2O3 in the purified solution of not more than 0.001% is carried out through sorption of iron with a cationite in H-form, containing aminodiacetic functional groups. The iron sorption and desorption steps are alternated without intermediate washing of the cationite. Iron is desorbed in counterflow conditions with nitric acid solution. |
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Method for extraction of palladium (ii) from wasted catalysts The invention relates to hydrometallurgy of precious metals and can be used to extract palladium from wasted catalysts, including catalysts of low-temperature oxidation of carbon oxide (II) based on γ-Al2O3, containing palladium chloride (II) and cupric bromide (II). The method includes acid leaching of palladium from wasted catalysts from the chloride solution. Furthermore, the acid leaching is carried out by 1 M solution of hydrochloric acid. The resulting solution is diluted with water to pH 1. The sorption of palladium is carried out from the diluted solution using chemically modified silica containing grafted groups of γ-aminopropyltriethoxysilane. |
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Extraction of gold, palladium and platinum from chloride solution Invention refers to the area of the extraction of gold, palladium and platinum from hydrochloric solutions. The method comprises their anionite sorption and desorption. The sorption shall be performed with low-basic anionites. After sorption, desorption with a mixture of sodium sulfite salts mixture Na2SO3 and sodium nitrite NaNo2. |
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Method of separating platinum (ii, iv) and rhodium (iii) in aqueous chloride solutions Method involves sorption of platinum (II, IV) and rhodium (III) through contact of the solution with a strongly basic anionite and then desorption from the anionite. Sorption is carried out from freshly prepared and held solutions on a Purolite A-500 anionite, containing a quaternary ammonium base as a functional group. Desorption from the anionite is carried out in two steps: at the first step - 24 hours after contact with 2M NH4SCN solution or 2M KNO3 solution to extract platinum. At the second step - after a further 24 hours with 2M HCl solution or 1M thiourea solution in 2M H2SO4 solution to extract rhodium. |
Another patent 2551239.