Method of products reprocessing, containing chalcogenides of base metals, lead, platinum metals, gold and silver
SUBSTANCE: invention relates to noble metals metallurgy and can be used for reprocessing of different wastes of refining, such as dust-fumes or water-insoluble residues of dust-fumes. Method of products reprocessing, containing chalcogenides of base metals, lead, platinum metals, gold and argentum includes leaching of initial product in solution of caustic soda, separation of received alkaline solution from insoluble residue. Insoluble residue is subject to melting with addition of manufactured products of refining, sodium-bearing flux and carbonaceous reductant. After melting it is implemented grinding of separated bottom heavy phase into the powder and its treatment as a concentrate of refining. Into received during leaching initial products alkaline solution it is added sulfuric acid up to pH=4-6, it is separated laid-down from the solution deposit of hydroxides on the basis of tellurium dioxide. Solution after the sediment separation is again treated by sulfuric acid up to pH=1-2, it is added sodium sulfite and separated laid-down deposit of metal selenium, and mother solution is subject to finishing de-refining.
EFFECT: cost cutting while de-refining of received during the reprocessing solutions.
The invention relates to the metallurgy of noble metals (BM) and can be used in the technology of refining of platinum group metals (PGM).
At affinage inevitably formed of various non-target products and waste containing PGM, silver, gold, in particular, such as Paleochora or water-insoluble residues Perevozchikov (the concentration of Perevozchikov), the incoming dust and gas in the tunnel and into the gas purification system with different technological areas and areas.
A characteristic feature of Perevozchikov or the concentration of Perevozchikov is that their base is provided with a large number of different chemical elements and their compounds, mainly highly volatile chalcogenides base metals, ammonium chloride and silver, lead, soot carbon. This intermediate contains from 0.5 to 3% MPG (combined), from 0.05 to 0.2% gold, from 3 to 10% silver, 10 to 20% of lead, 4 to 8% of selenium, from 6 to 10% tellurium, from 2 to 4% of arsenic. Processing Perevozchikov or the concentration of Perevozchikov is very difficult and involves high material and labor costs.
From publicly available literature it is known that processing of Perevozchikov can be carried out by pyrometallurgical - melting blend containing as fluxes soda, borax, glass, and in some cases coal, and as to the of lectora noble metals used copper [fundamentals of metallurgy. V.5. - M.: metallurgy, 1968. S].
The disadvantages of this method is similar when it is used for processing Perevozchikov refining production, containing, along with BM significant amount of chalcogenides base metals, as follows:
- education in melting of large quantities of secondary Perevozchikov enriched with a highly volatile chalcogenides containing BM in need of recycling;
- transition chalcogenides smelting in the target alloys BM, which increases their mass consumption of reagents and work on refining.
There is a method of processing products containing chalcogenides base metals, lead, platinum group metals, gold and silver, according to which the original product is leached in a solution of caustic soda, separating the obtained alkaline solution from nerastvorimogo balance, melted the last with the addition of middlings refining, sodium fluxes and carbon reductant, defend and cooling the melt before solidification, share the cured product according to the phase boundaries, crushed and processed bottom heavy phase as the concentrate processing facilities [RF Patent №2291212, Efimov V.N., Temirov S.A., Moskalev A., Churkin, VA, Gubin MV - BI No. 1, 2007]. This method is the closest in technical essence to savla is the PTO method and adopted as a prototype.
Using the prototype method for processing Perevozchikov or the concentration of Perevozchikov refining production along with a number of positive features associated with the following negative consequences. In the leaching of the raw product in a solution of caustic soda in the alkaline solution is transferred not only a large part of the contained halogeno (selenium, tellurium and arsenic, - which is a useful enrichment directed to the melting of nerastvorimogo balance, but some, relatively small (20-30 mg/l) number of PGM.
In this regard, all the obtained alkaline solutions are inevitably subject to the finish obezobragivanii by the cementation process. However, the high saturation of the solutions with chalcogenide (tellurium and selenium) leads to increased consumption of cementing agent, the increase in the mass returned to the refining of the target product - cementite, undesirable contamination of the latest chalcogenide, arsenic and lead, and, as a consequence, great work on the finishing obezobragivanii solutions and processing the received cementation.
The proposed method aims to obtain a technical result, which consists in reducing the cost of finishing obezobragivanii solutions obtained by leaching products containing chalcogenides base metals, lead is C, the platinum group metals, gold and silver in a solution of caustic soda.
The achievement of the technical result is ensured by the fact that obtained by leaching of the raw product in caustic soda alkaline solution, after its separation from nerastvorimogo residue, add sulfuric acid until the solution pH environment of pH 4-6, separating precipitated from solution, the precipitate of hydroxides on the basis of tellurium dioxide, then the solution is again treated with sulfuric acid until the solution pH environment of pH 1-2, add salt sodium sulfite, separating the precipitation of metallic selenium, and the mother liquor is subjected to finishing obezobragivanii.
Thus, from the alkaline solution before operation obezbalivaniya gradually extract the first precipitate of hydroxides on the basis of tellurium dioxide, then metallic selenium, and finish obezobragivanii expose the remaining mother liquor. This reduces the flow of cementing agents, the output obtained cementation, the costs of recycling. From the cycle of refining can be derived two new products: a mixture of hydroxides on the basis of tellurium dioxide and metallic selenium.
Took 63 g wet (W=42,8%) of the original product (the concentration of Perevozchikov - the so-called "concentrate the dust electrify trow"), containing chalcogenides base metals, lead, platinum group metals, gold and silver. According to analysis of the original product (by dry weight) contained, wt.%: Pt - 0,53; Pd - 0,79; Rh - 0,03; Ir - 0,01; EN - 0,04; MPG (combined) - 1,40%; Au - 0,13; Ag - 5,8; Te - 7,2; Se - 6,5; Sn - 4,5; As-2, 6; Pb - 14, 5; Cu - 0,96; Sb - 2,9; Fe - 3,9%.
The original product was subjected to leaching in a solution of caustic soda, separated by filtering the alkaline solution from nerastvorimogo balance. It was obtained two products - alkaline solution in the amount of 300 ml, nerastvorim balance. The yield of the latter (by dry weight) was 20.0 g or 55.6% of running on the leaching of the original product. According to the analysis, the content of BM in the concentration amounted, %: Pt - 0,93; Pd - 1,40; Rh - 0,05; Ir - 0,017; EN - 0,067; Au - 0,23; Ag - 10,44. Thus, the content of PGMs, gold and silver (total) increased 13,13%, 1.79 times greater than it was in the source material prior to leaching.
In a solution of caustic soda from the original product moved base elements. Their concentration in the solution according to the results of the analysis was, g/l: Te - 7,11; Se - 6,23; Sn - 2,21; As - 2,55; Pb - 5,39; MPG (combined) - 17 mg/L. Thus, the solution of the original product has passed 82.2% of tellurium, 79.8 per cent of selenium, 40.9% of tin, 81,6% arsenic and 31.0% of lead. Copper, iron and antimony remained mainly in nerastvorim residue.
The alkaline solution was treated with concentri vannoy sulfuric acid to establish a pH of medium pH 5 and separated by filtration of precipitated from solution residue on the basis of tellurium dioxide. Thus obtained 300 ml and 5.38 g (dry weight) of sediment, which contained, per cent: The - 38,5; Se - 6,3; Sn - 11,7; As - 1,8; Pb - 27,8.
The concentration of base elements in the solution after separation of the hydroxide was, g/l: Te - 0,2; Se - 5,1; Sn - 0,1; As - 2,3; Pb - 0,4; PGM (total) - 14 mg/L.
To the resulting solution was added concentrated sulfuric acid to establish a pH of medium pH of 1.5, then added 6 g of sodium sulfite. The solution was passed with stirring for 2 h and separated by filtration of precipitated from solution precipitate metallic selenium. It was obtained 1.39 g (dry weight) of selenium containing 99.4% of the basic substance, and 300 ml of solution, which contained according to the analysis, g/l: Those To 0.19; Se - 0,44; Sn - 0,1; As - 1,9; Pb - 0,4; PGM (total) - 11 mg/L. This solution is aimed at finishing obezobragivanii.
Thus, the original alkali solution and, therefore, from the cycle of refining in the besieged two products, in aggregate, receive 97,2% tellurium, 93,0% selenium, or 95.5% tin, 25.8% of the arsenic and 92.6% of lead.
Proposed in the present method pre-treatment to be obezobragivanii solution from most of the impurities base elements greatly simplifies finishing the deposition of PGM cementation. It reduces the consumption of cementing agent, as the latter is not consumed in the deposition of halogeno, swint and tin, increases the PGM content in the received samantatah that the costs for subsequent refining.
The precipitate selenium can be used in the production of additional marketable products - metal selenium.
Nerastvorim in caustic soda the remainder of the original product (the concentration of Perevozchikov) was further processed according to the technology provided by the method of the prototype (without any differences).
For this nerastvorim in caustic soda residue was mixed with addition of concentrate refiner produced by the cementation processing solutions refining production (so-called cemented containing copper and iron, along with PGM).
This cemented contained, wt.%: Pt - 1,11; Pd - 1,59; Rh - 0,18; Ir - 0,08; EN - 0,24; MPG (combined) - 3,20%; Au - no; Ag - no; Se - 6,5; Those to 2.5; Cu - 18,2; Fe - 10,1%.
Additive cementate took in the amount of 20 g, i.e. to 100% by weight of nerastvorimogo in caustic soda source product (the so-called "concentrate electrostatic dust). It is taken two products added sodium fluxes (8 g of crushed silikatnogo glass, 4 g of sodium carbonate and 2 g of carbon reductant - Corsica. All components of the mixture were mixed and loaded into a melting alongby the crucible. The crucible was placed in the mine laboratory electric furnace and subjected to isothermal aging (heat) for 5 minutes at a temperature of 1300°C. At the end of the melting crucible was unloaded from the furnace.
After cooling, extracted from the crucible of the hardened product, which is divided by the formed interfaces. When this was received:
- 2.64 g of bottom heavy phase is the target of an alloy of platinum metals and gold at the following content of the analyzed elements (ICP data), %: Pt - 15,28; Pd - 21,55; Rh - 1,70; Ir - 0,70; EN - 2,08; MPG (combined) - 41,31%; Au - 1,14; Ag - 3,45; Se - 0,76; Te - 1,6; Sn - 6,29; As - 2,12; Pb - 7,95; Cu - 5,42; Sb - 22, 0mm Fe - 0,20%;
- was 12.75 g stenopogoninae light alloy, containing (according to the ICP), %: Pt - Being 0.036; Pd - 0,225; Rh - 0,007; Ir - 0,007; EN - 0,047; MPG (combined) - 0,322%; Au - 0,12; Ag - 15,65; Se - 10,82; Te - 5,17; Sn - 4,35; As - 0,63; Pb - 18,95; Cu - 29,17; Sb - 1,31; Fe - 8,21%;
- of 21.7 g of silicate-sodium slag, containing (according to the spectral analysis of platinum group metals and gold.
In a target rich alloy extracted, %: Pt - 98,85; Pd - 95,20; Rh - 97,94; Ir - 95,11; EN - 89,52; the amount of PGM - 96,36%. This target alloy is pulverized into a powder and processed as concentrate refining production.
Stenopogoninae light alloy, in which the extracted about 78% of selenium, 69% of tellurium, 94% copper, 81% of lead and 31% iron (from running in the heat quantities), processed using known methods.
Thus, using the proposed method of processing products containing chalcogenides base metals, lead, platinum group metals, gold and Orebro, including leaching of the raw product in a solution of caustic soda and providing pre-phased cleanup to be obezobragivanii alkaline solution from most of the impurities base elements (mainly from selenium and tellurium), - greatly simplifies finishing the deposition of PGM cementation, reduces the cost of cementing agent, to increase the PGM content in the received samantatah, to reduce the cost of their subsequent refining and to obtain a sediment selenium, which can be used in the production of additional commercial products.
A method of processing products containing chalcogenides base metals, lead, platinum group metals, gold and silver, including the leaching of the raw product in a solution of caustic soda, the Department received the alkaline solution from nerastvorimogo residue, melting of nerastvorimogo balance with the addition of middlings refining, sodium fluxes and carbon reductant, settling and cooling of the melt before solidification, separation of the hardened product on the phase boundaries, grinding dedicated bottom heavy phase in the powder and its processing as concentrate refining production, characterized in that obtained by leaching of the raw product in the couse is practical soda alkaline solution after its separation from nerastvorimogo balance add sulfuric acid until the solution pH environment of pH 4-6, separating precipitated from solution, the precipitate of hydroxides on the basis of tellurium dioxide, the solution after the precipitate was again treated with sulfuric acid until the solution pH environment of pH 1-2, add sodium sulfite, separating the precipitation of metallic selenium, and the mother liquor is subjected to finishing obezobragivanii.
SUBSTANCE: invention concerns metallurgy field. Particularly it concerns receiving technique of nickel and can be used at treatment of efficient solutions of sulfuric acid leaching of nickel. Treatment technique of sulfuric acid nickel-bearing solutions includes its rectification from ferric iron by solution neutralisation till pH=5 and extraction from it nickel. At that neutralisation till achieving pH=4 is implemented by alkali metal hydrate, and further neutralization from pH=4 till pH= 5 - by aqua ammonia.
EFFECT: increasing of nickel extraction from efficient solution of sulfuric acid leaching at its purification from ferric iron.
2 tbl, 2 ex
SUBSTANCE: method of neutralisation against residual cyanide of liquid phase of tail pulps after sorption of nonferrous metals includes cyanide deposition by reactant in the form of insoluble complex compound. At that in the capacity of reactant it is used pulp filtrate from the process of biooxidation of sulphide gold-bearing concentrate, containing sulfuric acid and ferric iron sulfate. At deposition reactant is used in ratio not less than 10 l of pulp filtrate per 1 m3 of each liquid phase of tail pulps, at finite pH of deposition 6.5-7.5 and time not less than 1 hour.
EFFECT: effective usage at enterprises of non-ferrous metallurgy for treatment of tail pulp of gold-extracting mill from residual cyanide.
2 tbl, 1 ex
SUBSTANCE: invention refers to method of extraction of at least one metal compound and/or its element out of liquid mixture or out of mixture containing catalyst and/or residuals of catalyst after homogeneous catalysed reaction. The method includes contacting of the said mixture with heteropolyacid or with anion of heteropolyacid, at that volume of heteropolyacid or anions of heteropolyacid consists at least 0.1 of equivalent with obtaining a sediment, at that, this sediment is practically non-soluble in the said reaction mixture and containing heteropolyacid or anion of heteropoliacid and compound of metal and/or its element; the method also includes reduction of the reaction mixture.
EFFECT: upgraded efficiency of process.
41 cl, 3 ex
SUBSTANCE: method involves co-sedimentation of admixture-containing solution of americium oxalate on a carrier represented by calcium oxalate, followed by obtaining nitrate americium-containing solution and americium oxalate, with its further calcination to dioxideo. Americium-containing carrier sediment is also calcinated to oxides. Nitrate solution is obtained by dissolving oxides formed during calcination in nitric acid. Americium is extracted from nitrate solution with the help of solid extragent based on diisooctylmethylphosphonate, with further re-extraction. Americium oxalate is obtained by sedimentation from condensed re-extract.
EFFECT: extended range of methods of obtaining dioxide.
3 cl, 3 ex
SUBSTANCE: invention refers to metallurgy, particularly to hydrometallurgical methods of processing and deactivation of radioactive waste at rare metal production. The method includes hydro washing away of spent melt of saline spraying filter (SSF), the chlorination process of loparit concentrates, treatment of produced suspension with alkaline reagent, mixing with iron containing shop flush waters, separation of radioactive sediment from the mother solution and transporting of radioactive sediment into a special waste storage (SWS). Prior to treatment with the alkaline reagent the suspension, produced after hydro washing away of spent melt SSF, is mixed at a ratio 1:(0.8-1.2) with the solution, containing 250-300 g/dm3 chlorides of alkali metals, and is heated to 85±5°C. With the use of solution of sodium hydroxide as the alkaline reagent treatment of the suspension is performed to pH 2.0+0.5, then this solution is held for 0.5+0.1 hr, then solution of high molecular flocculant- hydrolysed oilacrilamid - is introduced and is held without mixing for 2.0±0.5 hrs. After that the thickened part of the suspension is fed to a nutsch-filter, the produced sediment - rare metal concentrate - is dried, tempered and transfered to chlorination of source loparit concentrates. Filtrate is combined with clarified portion of the suspension, heated to 80±10°C and treated with solution of sodium hydroxide to pH 12.0±0.5. Produced oxihydrate pulp is held at 80±10°C for 1.0±0.5 hrs and is fed to a filter-press-I; the extracted radioactive sediment is washed out at the filter-press-I 3-4 volumes of water, and process water is merged with shop flush water. The washed out sediment is blown out with a compressed air at the filter-press-I, then unloaded and transported to SWS, while mother solution is mixed at a ratio of 1:(10-20) with iron containing shop flush water. Produced radioactive chloride solution is heated to 80±10°C and treated with solution of sodium hydroxide to pH 12.0±0.5, the resulted pulp is held at 80±10°C and pumped to a filter-press-II with production of deactivating solution, which is discharged to a shop drainage, and with production of sediment; the latter is merged with the sediment - rare metal concentrate, extracted out of suspension after dissolving of the spent melt SSF; the said sediment is heat treated and partially neutralized, then dried, tempered and transferred to chlorinating in saline chlorinators together with the source loparit concentrate.
EFFECT: upgraded degree of deactivation of solutions and discharge waters and additional extraction of valuable elements.
2 dwg, 1 ex
SUBSTANCE: invention relates to method of regenerative purification of copper-ammonia etching solutions. Method includes neutralisation of solutions with acidic agent, sedimentation of copper in the form of hard-soluble compound and separation of sediment from solution. Neutralisation involves using as acidic agent of hydrochloric acid solution or acidic solutions of copper plating to minimal values of content of residual copper in solution. Separated hard-soluble copper compound is regenerated by dissolving, obtaining copper chloride concentrate. After sediment separation, water is removed from solution and, in presence of organic solvent, ammonia chloride is isolated for preparation of galvanic solutions of copper plating. Organic solvent is regenerated by distillation, and residual copper is removed from solution during acidification by iron cementation.
EFFECT: regeneration of ammonia chloride and copper cations from solutions, their use in processes of galvanic solution preparation and purification of sewage water with content of copper cations lower than MPC values.
SUBSTANCE: invention refers to hydrometallurgy of noble metals and can be used at processing of gold-silver alloys. The method includes dissolving of granulated gold-silver alloy with chloronitric acid and separation of silver chloride. Before sediment of gold out of the produced solution it is treated with carbamide powder, then settled during 12-24 hours and the sediment of silver chloride is repeatedly separated. The settled gold is washed with concentrated hydrochloric acid during 4-5 hours at the temperature of 50-60°, and after cooling of the washing solution, washed with water.
EFFECT: reduction of "back remaining" of gold in the process, increased output of available product, including reduction of material and labour consumption required for obtaining of final product.
1 tbl, 2 ex
SUBSTANCE: invention relates to hydrometallurgy field. Particularly, it concerns cleaning of iron solutions, notably it is cleaning of nickel electrolyte from iron. And also it can be used in other areas of industry if there are implemented processes related to treatment of liquids by gases. Method of solution cleaning from iron includes iron oxidation by means of air supply into iron-containing solution with pH=3.4-3.8 and temperature 65-80°C while constant mixing, receiving of iron-containing pulp and sedimentation of iron-containing sludge. Air before supplying into iron-containing solution is heated beforehand up to temperature 65-80°C.
EFFECT: speed step-up of iron-containing sludge sedimentation and with this the increasing in productivity of hydrometallurgy equipment.
SUBSTANCE: for immersion of As from diluted solution it is used the sediment of nanocrystals of akaganeite β-Fe3+O(OH) in nanostructured range in the limits from 2.12 to 2.34 nm, under ionic strength of solution 0.1 М KNO3 and рН 4.5. The immersion of arsenates is done under the ratio of akaganeite of iron (Fe/As) to anion of arsenic equal to 10/1. The sediment of akaganeite with surface area 299-300 m/g and maximum of sorbite capacity 100-120 мг As(V) to gram of akaganeite is generated by immersion of iron chlorides (III) ammonium carbonate, with osmose on diaphragm М 45 and sublimation drying under the room temperature.
EFFECT: diminution of costs and exceeding the efficiency of water solution of sewage from cation of heavy metals and anions.
3 cl, 3 tbl
FIELD: processes and equipment for extracting metals out of solutions, mainly separation of metals such as lithium, aluminum, chrome, manganese, iron, cobalt, nickel, molybdenum, cadmium, vanadium and others from raw material with low content of useful components, particularly from sea water and passing waters of gas and oil fields.
SUBSTANCE: method comprises steps of dissolving polymer whose macromolecules are uniformly distributed in volume of solution; providing interaction of metal and polymer in solution for forming complex; extracting polymer complex out of solution by sorption or by electro-osmosis in order to produce metal in the form of metal-polymer complex; decomposing complex due to action of complexion agent, acid, salt or alkali for extracting metal in the form of salt solution; regenerating polymer remained after metal extraction by means of other solution having affinity to said polymer; again using polymer.
EFFECT: usage of raw materials with low concentration of metal, possibility for using wide assortment of sorbents, extracting metal out of media contaminated with suspended matters, complete extraction of metal without contamination of environment, prevention of soil contamination caused by linking of heavy metal with polymer.
3 cl, 9 ex
SUBSTANCE: metallic iron concentrate, containing nonferrous and precious metals is melted at the temperature 1400-1600°C with feeding of oxygen-containing wind and not containing flux silicon with forming of metal melt and wustite dross. 70-95% of iron is transferred into the wustite dross, containing less then 5-10% SiO2, and nonferrous and precious metals - into metallic melt with following divided discharge of melt products.
EFFECT: invention provides transferring of major mass of iron into the wustite dross, and nonferrous and precious metals to concentrate in metal alloy, available for further inclusion into the technology of copper-nickel manufacturing.
4 cl, 2 tbl, 1 ex
SUBSTANCE: invention relates to hydrometallurgy, particularly it relates to method of joint separation of platinum metal (PM). Method includes several stages: first stage is implemented for leaching of initial material, containing PM and impurity element. The second stage is implemented for removing of impurity elements from alkaline solution from leaching by solvent extraction, the third stage - for removing of palladium from raffinate. The fourth stage is implemented for removing from raffinate of impurity element cations by extraction by dissolvent. The fifth stage is implemented for extraction from the raffinate of platinum by hydrolysis, the sixth stage - for extraction from ruthenium settling by leaching and the seventh stage - for extraction of iridium by solvent extraction with receiving of desorbed alkaline solution, containing iridium, and raffinate containing rhodium.
EFFECT: effective removing of impurity elements, with each of separated PM allows grade enough for that it could serve in the capacity of commercial product.
18 cl, 14 tbl, 1 ex, 3 dwg
SUBSTANCE: invention relates to hydrometallurgy. Particularly it relates to method of extraction of nonferrous (Cu, Zn, Co, Ni and others), rare (U, rare earths, Y, Re, Ti, In and others) and precious (Au, Ag, Pt, Pd and others) metals from ores and materials. Method includes leaching of ores in two stages. At the first stage ore and materials treatment is implemented by the first spillage leaching solution with introduction of sulfuric acid and salts of ferric iron in amount, providing in the end of leaching in productive solution molar ratio ion concentration of ferric and ferrous iron no lower than 1:1. At the second stage ore and materials treatment is implemented by the second spillage leaching solution with introduction of sulfuric acid, thiocyanate salts and ferric iron in amount, providing in productive solution molar ratio of ion concentration of thiocyanate and ferric iron no higher than 2:1 and no lower 0.5:1, and ratio of concentration ferric and ferrous iron ions are also no lower than 1:1. Then it is implemented separate processing productive solutions of each stage by means of chemical deposition, sorption and/or electrolysis and spillage solutions return for corresponding stage.
EFFECT: increasing of extraction ratio of nonferrous, rare and precious metals.
5 cl, 5 tbl, 11 ex
SUBSTANCE: invention is related to noble metals metallurgy and can be used for technology of desilverisation and gold extraction from zinc-bearing golden-silver cyanic sediments with increased content of silver. Initial zinc-bearing golden-silver cyanic sediment is leached, at first, in nitric acid solution and then into received pulp excluding filtration it is added caustic soda solution till achieving the concentration NaOH, equal to 100-140 g/l. After it alkaline solution is separated from non-solved sediment. The latter is washed by alkaline solution, dried, molten with fluxes on golden-silver alloy. Received alloy is settled, slag is separated from silver gold-bearing alloy, which is directed to silver refining by means of electrolysis in nitro-acid electrolyte. Electrolysis products are refined cathodic silver and golden sludge, which is refined by well-known methods.
EFFECT: removing of detrimental impurities, essentially, zinc, selenium and tellurium made of initial cyanic sediment.
SUBSTANCE: invention refers to methods of gold and silver recovery from sulphide concentrates and industrial deposited concentrates. Method involves leaching gold-bearing and argentiferous concentrates with acid thiocarbamide liquors with the oxidiser added and extraction recovering noble metals from leaches. Extraction is preceded with adding thiocyanate ions to leaches in amount to ensure complete transferring thiocyanate gold and silver complexes into the organic phase. Extractant is mixed tributyl phosphate (TBP) and diphenylthiocarbamide (DPTC) in kerosene, containing TBP 1.5-2.0 mole/l and DPTC 0.015-0.022 mole/l. Gold and silver are re-extracted from the organic phase with the reducing agents precipitating noble metals within reduction process.
EFFECT: lower thiocarbamide loss at the stage of noble metal extraction from the leach.
9 cl, 1 tbl, 25 ex
SUBSTANCE: invention relates to method of metals heap leaching, notably, gold from ore. Method includes ore reduction, ore division into fractions, ore dump by uniform in fractions inclined layers with reduction of ore fineness from the low layer to top with separation of layers by perforated polymer film. Then it is implemented stack irrigation by leaching cyanide solution with concentration 0.2-0.8 g/l. Additionally after dump of each ore leaching it is implemented treatment of layer by cyanide solution with strengthen concentration and its standing. Concentration of cyanide solution and standing duration are reduced from low later to top from 2.0-4.0 g/l till 1.0-1.5 g/t and from 5-6 days till 2-3 days correspondingly.
EFFECT: leaching effectiveness increase.
FIELD: technological processes; metallurgy.
SUBSTANCE: method for cuvette-heap leaching of metals is related to hydraulic metallurgy and may be used in leaching of non-ferrous, rare and precious metals ores. Method includes treatment of mineral mass with solution of leaching agent and metal extraction. Treatment of mineral mass with solution of leaching agent and metal extraction is carried out in two stages. Previously mineral mass is placed in cuvettes with hydraulically insulated walls and bottom. Then solution of initial reagent is introduced, and local portion activation of produced pulp is carried out with provision of secondary reagents. After activation pulp is exposed to fractioning with extraction of sludge-clay and sand fractions. Sand fraction is dehydrated. Productive solution and sludge-clay fraction produced as a result are exposed to sorption or electric sorption leaching. Stacks are formed from sand fraction, and material is exposed to heap leaching. Liquid phase that remained after leaching of sand and sludge-clay fraction is additionally strengthened and sent for heap leaching.
EFFECT: higher efficiency of process.
2 cl, 1 ex
SUBSTANCE: it is implemented treatment of copper-nickel sulfide concentrate by fluoride and/or ammonium bifluoride at the temperature 165-210°C during 2-3 hours with forming of hard fluorination products and emission of ammonia gas and water vapor. Fluoride and/or ammonium bifluoride are used in amount 1.0-1.2 from stoichiometric with respect to overall content in copper-nickel concentrate of silicates and pyrrhotine. Hard fluorination products exposed to water leaching at the temperature 40-60°C and S:L=1:5-6 during 1-2 hours with transformation to residue nickel sulfide, copper, cobalt, platinum metal and magnetite, and into solution - fluorine-ammonium silicon saline, magnesium, iron, aluminium and calcium. Residue is separated from solution and exposed to magnetic separation with magnetite extraction. Received solution is neutralised by ammonia water till providing of pH 8-10 with regeneration of fluoride and/or ammonium bifluoride and receiving of residue of magnesium, iron, aluminium, calcium and silica hydroxides. In the capacity of ammonia water for solution neutralisation can be used ammonia gas and water vapors from the stage of raw materials fluorination. Formed ammonium fluoride and/or bifluoride are returned to raw materials treatment stage.
EFFECT: energy content reduction and providing of selectivity sulfide crude ore treatment at less number of operations.
5 cl, 1 dwg, 4 ex
SUBSTANCE: invention concerns treatment of hard gold-arsenic ores. Particularly it concerns antimonous sulphide ores and concentrates. Method includes without oxidising melting in smelting chamber with receiving of matte and slag melts and treatment of melting products by metallic phase. At that without oxidising melting is implemented continuously in circulating melted slag with out of melting products into settling chamber to interphase boundary slag - matte. Before melting circulating melted slag is separated from operating gases. For circulating it is used maximum separated from matte slag. Treatment of matte by metallic phase is implemented in continuous operation. Furnace for processing of hard gold -arsenic ores and concentrates includes smelting chamber. Furthermore, it is outfitted by recycling contour, containing of gas-lift unit with tuyeres and descending and ascending channels of melted slag, gas separating and settling chambers. Gas separating chamber is communicated with smelting chamber through bleed blowhole by means of channel for separation of working gas of gas-lift unit and gas separating chamber from circulating melted slag. Smelting chamber immersed into settling chamber to interphase boundary slag - matte. Settling chamber contains gas flue for withdrawal of sublimates and low blowing melting products.
EFFECT: increasing of noble metals extraction into matte.
8 cl, 3 dwg
FIELD: noble metal hydrometallurgy.
SUBSTANCE: invention relates to method for acid leaching of platinum method from secondary raw materials, in particular from ceramic support coated with platinum metal film. Target metals are leached with mixture of hydrochloric acid and alkali hypochlorite at mass ratio of OCl-/HCL = 0.22-0.25 and redox potential of 1350-1420 mV.
EFFECT: decreased leaching temperature, reduced cost, improved platinum metal yield.