Method of separation of metallic palladium from waste mangani-palladium catalyst
FIELD: separation of palladium from waste mangani-palladium catalyst and cleaning of palladium.
SUBSTANCE: palladium-containing concentrate is treated with aqua regia solution and palladium is deposited in form of chloropalladate by means of treatment with aqua regia solution with solid ammonium chloride, pulp thus obtained is settled, cooled and filtered; sediment is treated with saturated hydrochloric acid solution of ammonium chloride. Then sediment thus treated is dissolved in water and solution is filtered and neutralized; pallarium is restored to metal by means of hydrochloric acid hydrazine at pH≥2 or formic acid solution at pH≥6; solution is filtered and metallic palladium is washed and dried at 90-100°C. Prior to treatment, mangani-palladium catalyst with aqua regia, it is dissolved in concentrated hydrochloric acid; solution is neutralized by asmmonia to pH=6-7 and treated with formic acid at flow rate no less than 1 l of HCOOH per kg of mangani-palladium catalyst; then mangani-palladium concentrate is filtered, washed and dried at 90-100ºC.
EFFECT: enhanced purity of metallic palladium at minimum losses of catalyst at all stages of chemical treatment.
The invention relates to the field of isolation and purification of palladium, in particular, from spent margantsevokislogo catalyst.
A method of obtaining dichlorodiammineplatinum from spent aluminum-palladium catalyst (patent RF №2100277 IPC6C 01 11/00, 55/00), including the firing of a catalyst at 500-700°, raspulpovka in water, processing water slurry with sulfuric acid, followed by heating and diluting the resulting mixture with water, separating palladium residue, dissolving it in hydrochloric acid, the processing of hydrochloric acid solution with ammonia, and the Department of ammonia solution of palladium, the processing of hydrochloric acid and separating the resulting precipitate dichlorodiammineplatinum. The disadvantage of this method when it is used for selection of palladium in the form of a metal from spent margantsevokislogo catalyst is too long and multistage processing of the source material, which is associated with the loss of palladium. Moreover, the firing of the catalyst in a stream of air at 500-700°With palladium partially oxidized, which will require additional surgeries to repair it.
Also known hydrometallurgical method of selection of palladium containing material (RF patent No. 2096505 IPC622 In 11/00), including melting and g is the cancellation of the original material, dissolve pellet in nitric, acid, separation of impurities in the form of hydroxide, dissolving the calcined palladium residue in a solution of Aqua Regia and the deposition of palladium from a filtered solution of sodium thiosulfate. The disadvantage of this method is the duration of the processing of the source material. In addition, when using palladium isolated in the form of a practically insoluble palladium sulfide, which complicates further processing to obtain the palladium in the form of metal.
Closest to the claimed technical solution is the method of obtaining metallic palladium (RF patent No. 2210609 IPC722 In 11/01, 3/05, 3/44), including the processing of palladium material with a solution of Aqua Regia, the deposition of palladium in the form of a salt of globaldata processing tsarskovodochnom solution of ammonium chloride, defending the obtained slurry, cooling, filtering and processing the precipitate on the filter with a solution of ammonium chloride. Salt globaldata precipitated solid ammonium chloride, the precipitate on the filter is treated with saturated hydrochloric acid solution of ammonium chloride, treated residue is dissolved in water, the resulting solution is filtered, neutralized and carry out the restoration of palladium to the metal, and the metal palladium is filtered off, washed and su is at 90-100° C. the recovery of palladium metal to conduct hydrochloric acid with hydrazine at pH≥2 or formic acid at pH≥6.
The disadvantage of this method when used for production of the metallic palladium from spent margantsevokislogo catalyst is that, as determined experimentally, during the precipitation of salts of chloropalladite of tsarskovodochnom solution containing large amounts of impurities, the precipitate formed is very small, which greatly complicates its filtering off and washing and significantly reduces the efficiency of the process for producing metallic palladium.
An object of the invention is to obtain pure metallic palladium with minimum losses at all stages of chemical processing margantsevokislogo catalyst.
This object is achieved in that the palladium concentrate is treated with a solution of Aqua Regia, precipitated palladium in the form of a salt of globaldata processing tsarskovodochnom solution of solid ammonium chloride, defend and cool the resulting slurry is filtered and treated sludge on the filter nasadenim hydrochloric acid solution of ammonium chloride, dissolved processed sediment in water, filtered off and neutralize the resulting solution, restore palladium to meta the La hydrochloric acid with hydrazine at pH≥ 2 or formic acid at pH≥6, is filtered off, washed and dried metallic palladium in the 90-100°C. When the metallic palladium is obtained from spent margantsevokislogo catalyst. Before treatment with a solution of Aqua Regia exhaust margantsevorudny the catalyst is dissolved in concentrated hydrochloric acid, the solution is neutralized with ammonia to a pH of 6-7, treated with formic acid at a flow rate not less than 1 l HCOOH 1 kg margantsevokislogo catalyst, followed by filtering, washing and drying to obtain palladium concentrate at 90-100°C, which is treated with a solution of Aqua Regia.
In the claimed technical solution is proposed a method of obtaining a palladium concentrate allows you to separate the main impurities and to allocate palladium in the form of pure metal with minimal losses at all stages of chemical processing of spent margantsevokislogo catalyst.
The analysis of publicly available sources about the level of technology did not allow to identify a technical solution, identical claimed, on the basis of which a conclusion is made about the uncertainty of the latter, i.e. under provided in this application of the invention, the criterion of "novelty".
Comparative analysis of the claimed solution is Zvezdnyi technical solutions revealed that presents a set of distinctive features is not known to the person skilled in the art and not obvious from the prior art, on the basis of which a conclusion of compliance presented in this application of the invention, the criterion of "inventive step".
The proposed method of producing metallic palladium from spent margantsevokislogo catalyst implemented as follows.
500 g of spent margantsevokislogo catalyst containing 13 g of palladium, a large amount of manganese, as well as impurities of copper, lead, Nickel, zinc and aluminum dissolved in concentrated hydrochloric acid, the resulting solution was neutralized with ammonia to a pH of 6-7 and added 0.5 l of formic acid. Adjusted the pH of the solution by adding ammonia. The solution with the precipitate is boiled until complete discoloration of the solution. The precipitate was washed by decantation with hot water and filtered.
The palladium content in the filtrate was <0.8 mg/L. the resulting concentrate was dried at 90-100°With and dissolved in Aqua Regia. The cooled solution was added ammonium chloride ammonium in the form of a solid salt at the rate of 1 g NH4Cl 1 g of palladium and an excess of NH4CL - 10 g/L. the resulting slurry was stood for 5 hours and filtered through a filter of chlorin cloth is. The palladium content in the filtrate was 1.1 mg/l Residue on the filter was treated with hydrochloric acid (2:1) saturated ammonium chloride. The palladium content in the wash water was <0.4 mg/l Residue was dissolved in water when heated, filtered, the resulting solution was neutralized to pH 6 and added formic acid at the rate of 1.5 ml of HCOOH on 1 g of palladium. Adjusted the pH of the solution by adding ammonia. The solution is then treated with palladium was boiled before complete clarification of the solution. The precipitate was filtered, washed with hot water and dried at 90-100°C. the palladium Content in the filtrate and the wash water was 0.1 mg/L. palladium Metal was analyzed for impurities by the method of mass-spectral analysis. It was 0,0719%.
Metal palladium was obtained as in example 1, but in hydrochloric acid solution was added 0.6 l of formic acid. The obtained concentrate was washed, filtered, dried, dissolved in Aqua Regia, besieged salt chloropalladite, washed and dissolved it as in example 1, but the filtered solution globaldata was neutralized with ammonia to pH 2 and spent recovering palladium hydrazine hydrochloric acid, added at the rate of 1 g of N2H4·2hcl 1 g of palladium and an excess of N2H4·2hcl - 2 g/l Separation, washing and drying the obtained metallicheskogo palladium conducted as in example 1. The palladium content in arabinoxylan the filtrate was <0.8 mg/l, the content of palladium in the filtrate and the wash water after deposition and processing of salt localedata - 1.4 and 0.5 mg/l, respectively, the palladium content in the filtrate after restoring it to metal - <0.2 mg/l Total content of impurities in the resulting metal was 0,0809%.
Metal palladium was obtained as in example 1, but in hydrochloric acid solution was added 0.4 l of formic acid. The palladium content in the filtrate after filtration of the obtained concentrate was 103 mg/l, Filtration, washing, drying, dissolving the concentrate in Aqua Regia, the precipitation of the salt of chloropalladite, washing, dissolution, filtration, recovery of metallic palladium, washing and drying were carried out as in example 1. The palladium content in the filtrate and the wash water after deposition and processing of salt globaldata was 1.8 and 0.3 mg/l, respectively, the palladium content in the filtrate after restoring it to metal - <0.1 mg/l, the total content of impurities in the obtained metal - 0,0756%.
Obtaining metallic palladium held by the RF patent №2210609 IPC722 In 11/00, 3/06, 3/44 selected as the closest technical solution.
500 g of spent melaniemelanie catalyst R who has storyli in Aqua Regia when heated. In the resulting solution was added ammonium chloride in the form of a solid salt at the rate of 1 g NH4CL 1 g of palladium and an excess of NH4Cl - 10 g/L. When this NH4CL formed a tight wad and dissolve very slowly, so the resulting slurry to stand for 20 hours. Sludge globaldata formed very small and did not hoteltravel through the filter of chlorin tissue, so the precipitate was filtered by gravity through a porous glass filter (pore 41). The duration of filtration increased ˜ 100 times. The palladium content in the filtrate was < 1 mg/l Residue on the filter was treated with hydrochloric acid (2:1), saturated ammonium chloride. Leaching duration also increased ˜ 100 times. The palladium content in the wash water was <0.8 mg/l Residue was dissolved in water when heated, filtered, the resulting solution was neutralized it with ammonia to a pH of 6 and spent recovering palladium formic acid, added at the rate of 1.5 ml of HCOOH on 1 g of palladium. The solution is then treated with palladium was boiled before complete clarification of the solution. The precipitate was filtered, washed with hot water and dried at 90-100°C. the palladium Content in the filtrate and the wash water was <0.2 mg/l, the total Content of impurities in the metallic palladium was 0,0913%.
The results obtained indicated at log on is shown using the known technical solutions are compared with the proposed significantly increased the duration of the process of obtaining metallic palladium and significantly decreased its performance. In addition, for filtering off the precipitate of globaldata had to use glass, porous filters, that is to complicate the hardware design process, the proposed method of producing metallic palladium allows you to select from spent margantsevokislogo catalyst more than 99% of palladium with purification 0.07197%.
The developed method allows the use of standard equipment, cheap and available reagents, does not require large power consumption. The method is suitable from an environmental point of view, as the resulting acidic filtrates are neutralized with caustic soda solution.
Method for producing metallic palladium palladium from spent catalyst includes treatment with a solution of Aqua Regia, the deposition of palladium in the form of a salt of globaldata processing tsarskovodochnom solution of solid ammonium chloride, defending the obtained slurry, cooling, filtering and processing the precipitate on the filter is saturated hydrochloric acid solution of ammonium chloride, dissolving the treated sludge in water, filtering the resulting solution, neutralization, recovery of palladium to the metal hydrazine hydrochloric acid at pH≥2 or formic acid at pH≥6, the filter palladium metal, washing and drying at 90-100 , Characterized in that palladium metal produced from waste margantsevokislogo catalyst before the treatment with a solution of Aqua Regia exhaust margantsevorudny the catalyst is dissolved in concentrated hydrochloric acid, the solution is neutralized with ammonia to a pH of 6-7, treated with formic acid at a flow rate not less than 1 l HCOOH 1 kg margantsevokislogo catalyst, followed by filtering, washing and drying to obtain palladium concentrate at 90-100°S, which is treated with a solution of Aqua Regia.
FIELD: chemical industry; production of strontium carbonate.
SUBSTANCE: the invention is pertaining to the field of chemical industry, in particular, to production of strontium carbonate. The method provides for extraction and purification of strontium carbonate including isotope-enriched strontium carbonate produced by the electromagnetic separation method. The strontium concentrate is treated with an acid producing strontium-carrying sediment, transfer strontium into a solution with a separation and washing-down of the insoluble residue, produce crystals of strontium nitrate, purify the crystals from impurities by their washing-down with nitric acid. Then the crystals are dehydrated, dissolved and separated form impurities with the subsequent production of strontium carbonate. At that a solution produced after treatment of the strontium carbonate should be previously purified by settling and separation of the iron group impurities present in the form of hydroxides, and barium and lead - in the form of sulfates. The strontium-carrying sediment is settled in the form of the strontium carbonate due to addition in the solution of ammonium carbonate and ammonia with subsequent calcinations of the sediment at the temperature of 600-700°C. Strontium transfer in the solution by treatment of the calcined sediment of strontium carbonate with nitric acid at the ratio of (1:2) - (1:3). The dehydrated crystals of strontium nitrate are dissolved in water at the mass ratio of water to strontium nitrate equal to (1-2) :1 and the strontium carbonate is subjected to settling with the help of ammonium carbonate at pH equal to 9-10. The procedure of the preliminary separation of impurities in the form of hydroxides, sulfates and ammoniac complexes, calcinations of strontium-carrying with its subsequent dissolution and separation of impurities and a sedimentation of strontium with the help of ammonium carbonate at рН equal to 9-10 allows to extract 99.2 % of strontium-88 carbonate with a purification efficiency of 99.999 %. The technical result is production of pure strontium carbonate at minimum losses at phases of processing.
EFFECT: the invention ensures production of pure strontium carbonate at minimum losses at phases of processing.
3 cl, 5 ex
FIELD: hydro metallurgy.
SUBSTANCE: method comprises mixing vanadium-containing soda or other alkali solution with monoatomic alcohol, e.g. ethyl alcohol, to achieve alcohol concentration ≥ 25 vol % and settling the mixture for 2.5-3 min to separate it into two phases: bottom (heavy) and upper (light-weight) phases. The former contains 99% of the total amount of vanadium and the latter concentrated soda. Bottom phase is washed and dried to give sodium vanadate, which may be used either as reagent in melting operation to produce ferrovanadium or processed according to known technologies to produce any other vanadium compound. Alcohol is regenerated by heating mother liquor (upper phase). Mother liquor, after adjusting alkali concentration, is used for leaching next fresh portion of vanadium-containing material, for example metallurgical slag.
EFFECT: simplified process due to reduced number of process operations, increased (by 5%) degree of vanadium recovery, enabled regeneration of single reagent, and improved environmental condition.
2 cl, 2 tbl
FIELD: non-iron metallurgy, in particular scandium oxide recovery from industrial waste.
SUBSTANCE: method for preparation of scandium oxide from red mud being waste of alumina production includes: multiple subsequent leaching of red mud with mixture of sodium carbonate and hydrocarbonate solutions; washing and precipitate separation; addition into obtained solution zinc oxide, dissolved in sodium hydroxide; solution holding at elevated temperature under agitation; precipitate separation and treatment with sodium hydroxide solution at boiling temperature; separation, washing, and drying of obtained product followed by scandium oxide recovery using known methods. Leaching is carried out by passing through mixture of sodium carbonate and hydrocarbonate solutions gas-air mixture containing 10-17 vol.% of carbon dioxide, and repeated up to scandium oxide concentration not less than 50 g/m3; solid sodium hydroxide is introduced into solution to adjust concentration up to 2-3.5 g/m3 as calculated to Na2O (caustic); and mixture is hold at >=800C followed by flocculating agent addition, holding, and separation of precipitate being a titanium concentrate. Obtained mixture is electrolyzed with solid electrode, cathode current density of 2-4 A/dm3, at 50-750C for 1-2 h to purify from impurities. Zinc oxide solution in sodium hydroxide is added into purified after electrolysis solution up to ratio ZnO/Sc2O3 = (10-25):1, and flocculating agent is introduced. Solution is hold at 100-1020C for 4-8 h. Separated precipitate is treated with 5-12 % sodium hydroxide solution, flocculating agent is introduced again in amount of 2-3 g/m3, mixture is hold, and precipitate is separated. Method of present invention is useful in bauxite reprocessing to obtain alumina.
EFFECT: improved recovery ratio of finished product into concentrate; decreased impurity concentration in concentrate, reduced sodium hydrocarbonate consumption, as well as reduced process time due to decreased time of fine-dispersed precipitate.
2 cl, 2 ex
FIELD: chemical technology; deactivation and decontamination of radioactive industrial products and/or wastes.
SUBSTANCE: proposed method designed for deactivation and decontamination of radioactive industrial products and/or production wastes incorporating Th-232 and its daughter decay products (Ra-228, Ra-224), as well as rare-earth elements, Fe, Cr, Mn, Al, Ti, Zr, Nb, Ta, Ca, Mg, Na, K, and the like and that ensures high degree of coprecipitation of natural radionuclides of filtrates, confining of radioactive metals, and their conversion to environmentally safe form (non-dusting water-insoluble solid state) includes dissolution of wastes, their treatment with barium chloride, sulfuric acid, and lime milk, and separation of sediment from solution. Lime milk treatment is conducted to pH = 9-10 in the amount of 120-150% of that stoichiometrically required for precipitation of total content of metal oxyhydrate; then pulp is filtered and barium chloride is injected in filtrate in the amount of 0.4 - 1.8 kg of BaCl2 per 1 kg of CaCl2 contained in source solution or in pulp and pre-dissolved in sulfuric acid of chlorine compressors spent 5-20 times in the amount of 0.5 - 2.5 kg of H2SO4 per 1 kg of BaCl2. Then lime milk is added up to pH = 11 - 12 and acid chloride wash effluents of equipment and production floors are alternately introduced in sulfate pulp formed in the process at pulp-to-effluents ratio of 1 : (2-3) to pH = 6.5 - 8.5. Filtrate pulp produced in this way is filtered, decontaminated solution is discharged to sewerage system, sediment of barium and calcium sulfates and iron oxysulfate are mixed up with oxyhydrate sediment formed in source pulp neutralization, inert filler and 0.5 - 2 parts by weight of calcium sulfate are introduced in pasty mixture while continuously stirring them. Compound obtained in the process is placed in molds, held therein at temperature of 20 - 50 oC for 12 - 36 h, and compacted in blocks whose surfaces are treated with water-repelling material.
EFFECT: reduced radioactivity of filtrates upon separation of radioactive cakes.
8 cl, 1 dwg, 1 ex
FIELD: chemical technology; recovery of deactivated and decontaminated radioactive industrial wastes.
SUBSTANCE: proposed method that can be used for deactivating and decontaminating industrial radioactive wastes incorporating Tb-232 and their daughter decay products (Ra-228, Ra-224), as well as rare-earth elements, Fe, Cr, Mn, Sl, Ti, Zr, Nb, Ta, Ca, Mg, Na, K, and the like includes dissolution of wastes, treatment of solutions or pulps with barium chloride, sulfuric acid, and lime milk, and separation of sediment from solution. Lime milk treatment is conducted to pH = 9 - 10 in the amount of 120-150% of total content of metal oxyhydrates stoichiometrically required for precipitation, pulp is filtered, and barium chloride in the amount of 0.4 - 1.8 kg of BaCl2 per 1 kg of CaCl2 contained in source solution or in pulp, as well as pre-diluted sulfuric acid spent 5 - 20 times in chlorine compressors in the amount of 0.5 - 2.5 kg of H2SO4 per 1 kg of BaCl2 are introduced in filtrate. Alternately introduced in sulfate pulp formed in the process are lime milk to pH = 11 - 12, then acid chloride wash effluents from equipment and industrial flats at pulp-to-effluents ratio of 1 : (2 - 3) to pH = 6.5 - 8.5, and pulp obtained is filtered. Decontaminated solution is discharged to sewerage system and sediment of barium and calcium sulfates and iron oxysulfate are mixed up with oxyhydrate sediment formed in source pulp neutralization process; then 35 - 45 mass percent of inert filler, 10 - 20 mass percent of magnesium oxide, and 15 -m 25 mass percent of magnesium chloride are introduced in pasty mixture formed in the process while continuously stirring ingredients. Compound obtained is subjected to heat treatment at temperature of 80 - 120 oC and compressed by applying pressure of 60 to 80 at.
EFFECT: reduced radioactivity of filtrates upon separation of radioactive cakes due to enhanced coprecipitation of natural radionuclides.
7 c, 1 ex
FIELD: rare, dispersed and radioactive metal metallurgy, in particular hydrometallurgy.
SUBSTANCE: invention relates to method for reprocessing of polymetal, multicomponent, thorium-containing radwastes, formed when reprocessing of various mineral, containing rare-earth elements, Nb, Ta, To, V, Zr, Hf, W, U, etc. Method includes treatment of solution and/or slurry with alkaline agent; introducing of sulfate-containing inorganic compound solution and barium chloride; treatment of obtained hydrate-sulfate slurry with iron chloride-containing solution, and separation of radioactive precipitate from solution by filtration. As alkali agent magnesia milk containing 50-200 g/dm2 of MgO is used; treatment is carried out up to pH 8-10; sodium sulfate in amount of 6-9 g Na2SO4/dm2 is introduced as solution of sulfate-containing inorganic compound; barium chloride solution is introduced in slurry in amount of 1.5-3 g BaCl2/dm2. Hydrate-sulfate slurry is treated with solution and/or slurry containing 0.8-16 Fe3+/dm2 (as referred to startingsolution) of iron chloride, followed by treatment with high molecular flocculating agent and holding without agitation for 0.5-2 h. Radioactive precipitate is separated from mother liquor, washed with water in volume ratio of 0.5-2:1; then washed with sodium chloride-containing solution and/or slurry in volume ratio of 0.5-2:1; radioactive precipitate is removed from filter and mixed with mineral oxides in amount of 0.5-0.8 kg MgO to 1 kg of precipitate. Formed pasty composition is fed in forms and/or lingots and presses with simultaneous heating up to 80-1200C.
EFFECT: filtrate with reduced radioactivity due to increased codeposition coefficient of natural Th-232-group radioactive nuclide, in particular Ra-224 and Ra-228, with radioactive precipitates.
10 cl, 1 ex
FIELD: metallurgy; production of platinum and palladium concentrates and silver from platinum-containing raw materials.
SUBSTANCE: proposed method includes sulphatizing roasting and/or sulphatizing of platinum-containing raw material at temperature of 200-600 C for 1-17 hours. Cinder is molten with sodium chloride at mass ratio of 1:(1-10) at temperature of 600-900 C; fusion cake is leached-out with water at mass ratio of fusion cake to water equal to 1: (1-10) at temperature of 80-90 C. After filtration of this pulp filtrate and residue are obtained; filtrate settles separating the silver concentrate in form of sediment of insoluble salt of silver chloride from liquid phase. Silver concentrate is washed with solution of concentrated hydrochloric acid and water at mass ratio of 1:10; leaching residue is washed with solution of concentrated hydrochloric acid and water at ratio 1:1, after which it is washed with water. Washing water is mixed with liquid phase obtained after separation of silver chloride from filtrate and sediment in form of platinum-palladium concentrate is let to settle; this sediment is separated by filtration and is washed with water.
EFFECT: complete primary extraction of platinum metals from platinum-containing raw material; reduced toxicity; reduced duration of process; reduced power requirements.
1 tbl, 1 ex
FIELD: non-ferrous metallurgy; leaching-out polymetallic hard-to-open materials.
SUBSTANCE: proposed method includes treatment of material with chlorine in aqueous solution containing chlorine ions which is stirred in anode space of electrolyzer with separated anode and cathode spaces; as a result pulp is obtained; leaching-out operation is performed in anode space of electrolyzer separated from cathode space by cation-exchange membranes; operation is performed in aqueous solution containing hydrochloric acid in presence of nitrogen oxides at additional delivery of chlorine-containing gas by suction of this gas into rarefaction zone formed by impeller stirring the pulp. Gas formed during leaching-out process is combined with chlorine-containing gas; layer of finely-dispersed particles formed on surface of pulp is removed and is fed to stirring zone in lower part of anode space; productive leaching-out solution obtained after separation of it from insoluble residue is delivered to cathode space of electrolyzer; leaching-out process is performed at anode potential ensuring discharge of chlorine ions and cathode potential not exceeding the potential of discharge of hydrogen ions. Device proposed for realization of this method has housing with cover; interior of housing is divided into anode and cathode spaces with anodes and cathodes located inside them, units for loading the initial materials and discharging pulp formed during leaching-out process and units for mixing and feeding the chlorine-containing gas; anode space is made in form of chamber and cathode chambers are located on its opposite sides; anode chamber walls contain cation-exchange membranes; stirring unit is provided with impeller located below lower edge of anodes; vertical fins are provided on inner surface of anode chamber at level of impeller.
EFFECT: increased rate of extraction of beneficial components from initial material into solution for further extraction of them from solution.
17 cl, 3 dwg, 1 tbl, 8 ex
FIELD: metallurgy of non-ferrous and precious metals; production of antimony trioxide at accompanying separation of precious metals into self-contained commercial product.
SUBSTANCE: antimony sulfides from concentrate are dissolved by acid leaching-out with antimony pentachloride solution; one part of antimony trichloride solution is directed for extraction of antimony and other part is directed for making the leaching-out solution. Sulfur is removed from insoluble residue and gold head and gold-containing concentrate are separated by gravitation concentration method.
EFFECT: increased extraction of antimony and precious metals.
15 cl, 3 tbl, 1 ex