Treatment method of zinc-bearing golden-silver cyanic sediments
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.
The invention relates to the metallurgy of noble metals (BM) and can be used in the technology of extracting gold and silver from zinc-containing gold-silver cyanide sediments with high content of silver.
One of the most widely used methods of extracting silver and gold from raw ore is cyanidation.
The essence of this process is the leaching of precious metals with cyanide salts of alkaline or alkaline earth metals in the presence of oxygen. Passed into a solution of silver and gold is then precipitated by cementation with metallic zinc. Resulting zinc-containing gold-silver cyanide precipitation after separation from cyanide solutions are processed to extract silver and gold.
In the deposition of noble metals zinc dust get cyanide precipitation of very complex material composition. Along with silver and gold they contain an excess of metallic zinc, metallic lead, hydroxide and carbonate of zinc, simple cyanide zinc, carbonate and sulphate of calcium, copper, iron, arsenic, selenium, tellurium. In addition, the sediments are the oxides of silicon, calcium, aluminum and other [Intellence, Lview, Vfront and other metals precious metals. - 2nd ed., - M.: Metallurgist who I am, 1987, s].
Compounds cyanide precipitation received at various gold extraction plants, very significantly different, due to different types of source of mineral raw materials and the characteristics of the technologies used to cyanide leaching and cementation.
So, cyanide zinc precipitation received at the processing enterprises of the Magadan region, are characterized by an extremely high content of silver (30-80%), relatively low gold content (0.2 to 4%) and zinc (5-15%), the presence of selenium and tellurium (up to 2%), lead (up to 30%), copper (0.1 to 5.0%), oxides of silicon, calcium, aluminum.
The choice of processing methods cyanide precipitation is determined by the composition of the sediments, their quantity and the requirements for the degree of extraction of precious metals.
A method of refining gold-silver cyanide precipitation, consisting in the direct smelting of precipitation in the crucible with flux without any pre-processing. As fluxes are used soda, borax, silica sand and fluorspar. With the direct smelting of zinc cyanide precipitation of the formed slag contains oxides, highly corrosive crucible. At fusion releases a significant amount of oxides of zinc, cyanide and other substances. The fusion often turns out badly polluted base zolotas repany alloy. The slag produced during this operation, contain significant amounts of precious metals and must be subjected to special treatment. [Innplace. Metallurgy of noble metals. A textbook for colleges. - M, Metallurgizdat, 1943, SS-304].
This method is used rarely and only for processing very clean sediments that do not contain harmful impurities. In particular, this method cannot be used for processing cyanide sediments with high content of silver contaminated with selenium and tellurium produced at the enterprises of the Magadan region, since the presence of these impurities in the gold-silver alloy complicates subsequent refining and makes it difficult to use for this electrolysis in nitric acid environments (contained in the anode alloy chalcogen contaminate the cathode silver).
The most widespread method for processing of zinc-containing gold-silver cyanide precipitation, consisting of acid treatment sludge, separating the solution from nerastvorimogo precipitate, washing the precipitate with water, drying and subsequent heat with flux with the purpose of obtaining a gold-silver alloy, suitable for further refining [Intellence, Lview, Vfront and other metals precious metals. - 2nd ed., - M.: metallurgy, 1987, s-188 and s-327].
This method is n is the most closest to the technical nature of the claimed method and adopted as a prototype.
In the method prototype source leached residue (10-15)%sulfuric acid solution to remove in the solution of the main mass of the zinc and other soluble compounds. After leaching is separated by filtering the solution from nerastvorimogo precipitate, washed with water, dried and smelted with fluxes on the gold-silver alloy. As fluxes using soda, borax, silica sand, fluorspar.
The purpose of melting an additional office in slag base impurities and obtaining the gold-silver alloy, which is suitable for further refining. For melting can be used in furnaces of various designs. Melting lead to full recordigns slag. After melting, the melt defend and separate the produced slag from gold-silver alloy. Upon receipt of a rich gold-silver alloy (950-980 samples) it is sent for recycling (including electrolysis). If smelted metal is not clean, then it is subjected to repeated melting with the aim of refining.
The main disadvantage of the prototype method, when it is used for processing of zinc-containing gold-silver cyanide sediments with high content of silver (including precipitation received at the enterprises of the Magadan region), as follows:
- allocation of explosive hydrogen is ri interaction of zinc with sulfuric acid;
low extraction of selenium and tellurium in sulfuric acid solution from sediments enriched with silver, which during subsequent melting leads to obtaining contaminated chalcogenide silver gold alloy and does not allow its refining for one stage of electrolysis in nitric acid electrolyte without the use of additional cleanup operations;
- education is difficult filtered slurries that require the use of sophisticated filtration equipment.
The technical result, which sent the proposed method for processing zinc-containing gold-silver cyanide sediments with high content of silver, is to use the set of hydrometallurgical processing techniques, which allow to cleanse your source sediment from harmful impurities (mainly zinc and halogeno) and, however, do not have the above drawbacks inherent in the method prototype.
The task, which directed the alleged invention is the obtaining of the original cyanide precipitation of such a product, which, after washing, drying, melting with flux and separation from the slag would be a silver-gold alloy, suitable for refining (including for the electrolytic production of refined silver in nitric acid is electrolyte).
The achievement of the technical result is ensured by the fact that the original zinc-containing gold-silver cyanide leached residue first in a solution of nitric acid, then the resulting slurry (without filter) add a solution of caustic soda and then separate the alkaline solution from nerastvorimogo sediment. The latter is washed with an alkaline solution, dried, melted with flux on the gold-silver alloy. Melting lead to full recordigns slag. The resulting melt defend, separate the dross from the silver gold alloy, which is sent for refining silver by electrolysis in nitric acid electrolyte.
The essence of the method consists in the following. In the leaching of the raw product in nitric acid in the solution is transferred zinc, a large part of the acid-soluble impurities, and silver (the formation of explosive air-hydrogen mixture in this process excluded). In the insoluble residue concentrate gold, oxides of silicon and aluminum. The resulting slurry then, without filtering, is treated with a solution of caustic soda. In alkaline silver nitrate turns into practically insoluble oxides and precipitates. Admixture of copper and lead are also deposited in the form of hydroxides. Selenium and tellurium in an alkaline medium to form a soluble acid (H2SeO
As a result of this combination of chemical transformations form a slurry, solid base which are well filtered, silver oxide, gold, silica. Subsequent filtering and washing the precipitate allow to achieve the desired degree of separation passed into a solution of zinc, selenium and tellurium from nerastvorimogo sediment. The residual content of zinc and halogeno in nerastvorim sediment is small and does not affect performance, followed by melting.
Received nerastvorim precipitate is dried to remove free moisture and then smelted with fluxes in an electric or fuel furnace. In the process of melting fluxes interact with silica and other components of the mixture, forming a fluid is lacquer. The silver oxide is recovered due to thermal dissociation and together with the gold forms a silver-gold alloy, which is due to insolubility in the slag and higher density settles to the bottom of the melting furnace. After settling melt and separate the slag from the silver gold alloy latter is subjected to refining.
Due to the high content of silver and minor amounts of impurities (selenium and tellurium) refining of the alloy is carried out by electrolysis of silver nitrate solutions. The products of electrolysis are refined cathode silver and gold sludge that officeroute known methods.
A glass was placed 400 g of the raw product - zinc-containing gold-silver cyanide precipitate one of the gold extraction plants of the Magadan region. The original product (humidity - 5%) had the following contents of the analyzed elements, %: gold - 0,25; silver - 78,1; zinc - 6,0; selenium - 0,74; tellurium - 0,2.
The original product was added to 400 ml of water, the resulting slurry was added nitric acid to pH=0.5 to 1.0. Spent leaching of the raw product in a solution of nitric acid, which stirred the resulting slurry at a temperature of 70°C for 30 minutes.
Then added to the slurry a solution of caustic soda in amount of 500 ml (density, R is the target - of 1.46 g/cm3) and kept under stirring for 60 minutes titration Method was determined that the concentration of free NaOH solution and 120 g/L. Then separated by filtration of the alkaline solution from nerastvorimogo sediment. The volume of the alkaline solution was 1000 ml with the following concentrations of the analyzed elements, g/l: Zn - 16,1; Se - 2,14; Te - 0, 6; Ag - 0,003; Au is less than 0.002 g/L.
Nerastvorim precipitate was washed on the filter with a solution of NaOH, resulting in a received 600 ml of wash water, which contained, in g/l: Zn - 7,9; Se - 1,03; Those -0,2; Ag - no; Au - no, and 593 g of wet nerastvorimogo sediment. The latter was placed in a drying oven and dried for 4 hours at 110°C. the result was 374,9 g dry nerastvorimogo sediment, which by results of the analysis contained in%: Ag - 79,16; Au - 0,25; Zn - 0,51; Se - 0,013; no.
Obtained after drying nerastvorim residue was subjected to melting with flux with the aim of obtaining silver gold alloy. For this 360,0 g dry nerastvorimogo sediment (the rest of the sediment was used for analyses) was mixed with 30.0 g of quicklime (Cao) and 60.0 g of crushed silicate glass. All components of the mixture are thoroughly mixed and placed in a melting fireclay crucible, which was loaded in the shaft of the electric resistance. After isothermal aging in an oven at same time is the temperature value of 1250°C for 60 minutes, the crucible with the melt was unloaded from the furnace and allowed to settle and cool to room temperature. Then the products of melting were extracted from the crucible, the slag was separated from the silver gold alloy on a natural phase boundary. Received 90,5 g of slag and 287,04 g silver gold alloy. According to the results of the analysis of the alloy contained in %: Ag - 98,80; Au - 0,31; Zn - 0,0020; Se - 0,0032; no.
From the obtained alloy was manufactured anodes and conducted successfully refining silver by electrolysis in nitric acid electrolyte. The resulting cathode refined silver, corresponding in chemical composition to the requirements of GOST 28595-90, and gold sludge that can affinitatis known methods.
Method for processing of zinc-containing gold-silver cyanide precipitation, including leaching of the raw product in the acid solution, separating the solution from nerastvorimogo sediment, leaching of nerastvorimogo precipitate, drying and melting with fluxes, sedimentation melt, the Department received dross from the silver gold alloy and refining the latest electrolysis in nitric acid electrolyte, characterized in that the acid leaching of the original product, nitric acid, resulting slurry is added a solution of caustic soda to achieve the concentration of NaOH equal to 100-140 g/l, and then spend the separation of the alkaline solution from nerastvorim is gosia sediment, which is subjected to washing, drying and melting with flux.
SUBSTANCE: invention refers to brazilite concentrate technology from zirconium waste with simultaneous liberation of rare-metal concentrate. Invention refers to method of brazilite concentrate extraction. Herewith raw materials are magnetic finish fraction of brazilite concentrate. Magnetic fraction is processed with 7-10% hydrochloric acid or 10-30% sulphuric acid at 60-90°C. Brazilite deposition is separated, washed, dried and followed with two-phase magnetic separation. The first stage includes magnetic separation in magnetic field of average intensity equal to 10000-14000 E and liberation of crude brazilite concentrate and average-magnetic delivered to spoil bank. The second stage includes separation of crude brazilite concentrate in high-intensity magnetic field 20000-24000 E and liberation of base of brazilite concentrate and low-magnetic fraction processed in high-temperature sulphuric acid medium. Low-magnetic fraction is processed with 85-93% sulphuric acid at 200-250°C in mass relation S:L=1:0.4-0.6. Produced sulphatisation product is pulped in water with derived pulp from which residue of brazilite concentrate is separated and sulphate suspension containing rare elements is produced.
EFFECT: higher efficiency of brazilite concentrate extraction and for extended zirconium raw-material base.
3 cl, 4 ex
SUBSTANCE: invention can be used for production of high-purity silicon dioxide within integrated processing of magnesium-chrome crude ore that is mixed serpentinite, chromite, pyroxene and other minerals. Method of integrated processing of magnesium-chrome crude ore includes as follows. Crude ore is decomposed by solution of mineral acids. Produced suspension is filtered, and insoluble residue is processed. Filtrate neutralisation is accompanied with sedimentation of contained metal hydroxides with washing and drying of produced end-products. Processing of insoluble residue includes annealing at temperature 350-600°C, following dissolution in caustic soda to residual alkalinity 40-60 g/l NaOH, filtering of prepared suspension, washing of residue that is chrome ore concentrate and sedimentation of silicon dioxide from produced filtrate with solution of hydrochloric acid to residual acidity 2-15 g/l HCl.
EFFECT: higher separation integrity of silica component with simultaneous integrated extraction of other components of crude ore that provides extended application of base mixtures.
6 tbl, 2 ex
SUBSTANCE: invention concerns hydrometallurgy and ore benefication, extraction of nonferrous, less-common and noble metals from sulfide minerals, reprocessing of ore, concentrates and withdrawals of ore-dressing and metallurgical manufacturing, including concentrates, middlings, tails, slags, sludges and others. Technical effect of current invention is increasing of metals extraction from concentrates, decreasing of leaching time, decreasing of energy consumption used for leaching. Method of hydrometallurgical reprocessing of sulfide concentrates includes initial regrinding of concentrate in ball mill till size 60÷100% minus 0.044 mm at ratio of solid and liquid phases equal to 1:1÷2. Regrinding is being implemented during 4÷15 minutes. Then it is implemented leaching at solid phase content 9÷30 wt % in water solution of inorganic acid by concentration from 2.0÷150.0 g/dm3 at presence of ferric iron ions by concentration 3÷20 g/dm3 with usage of harmless compounds, containing active oxygen. Extraction of metals is implemented from leaching products.
EFFECT: increasing of metals extraction from concentrates, reduction of leaching time, decreasing of power consumption for leaching.
10 cl, 3 ex
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 refers to hydro metallurgical process and can be used for extraction of non-ferrous, rare and noble metals out of sulphide minerals and concentrates. The method includes oxidation of the primary raw material in the form of pulp with use of oxidising agents, containing nitrogen oxides; it also includes regeneration of lower nitrogen oxides to higher ones by oxidation. Pulp is subject to oxidation under the condition of controlled acidity with constant neutralisation of created as the result of sulphides oxidation sulphur acid to such level of acidity when formation of elemental sulphur is eliminated; as neutralisers, natural or artificial substances are used chosen from CaCO3, MgCO3, Ca(OH)2, CaO, NaOH, CaHPO4 depending on the necessity of producing products with specified physic and chemical properties such as: filterability, condensability, insolubility of arsenic, and nontoxicity. Oxidation is carried out at mixing which facilitates an adequate mass transfer and effective behavior of chemical reactions within a temperature range of 20-90°C, predominantly in the interval of 65-85°.
EFFECT: creating conditions for most complete extraction of metals excluding formation of elemental sulphur.
9 cl, 3 dwg
FIELD: nonferrous metallurgy.
SUBSTANCE: invention relates to processing nickel-containing intermediate products, namely ferriferous cakes obtained in hydrometallurgical nickel production process. Method comprises repulping of cakes with acid solution containing alkaline metal salts at elevated temperature and maintaining pH of pulp between 1.2 and 1.6. Repulping is effected in reactor provided with mechanical stirring means at specific stirring power in first stage 500-1000 W/m3 and in second stage 5-100 W/m3.
EFFECT: enhanced removal of nickel and improved filterability of products.
8 cl, 5 tbl
FIELD: nonferrous hydrometallurgy; other industries; methods of reprocessing of materials containing nickel in its protoxide form.
SUBSTANCE: invention is pertaining to the hydrometallurgy of non-ferrous metals and may be used at development of the production processes of refining of the converter mattes and reprocessing of other material containing nickel in its protoxide form. The method includes dissolution of these products in solutions of inorganic acids at potential of no less than 1.2 V of the hydrogen electrode, for what they introduce into the initial mash the oxidant, which if necessary is used in the course of production process for maintaining of the necessary value of the redox potential. The method allows to leach the persistent mineral forms containing nickel protoxide in the atmospheric conditions with production of solutions, containing less than 10 g/dm3 of the free acid at the variable concentration of nickel. The technical result of the invention is the increased extraction of the nickel into the solution at simplification of the production method.
EFFECT: invention ensures the increased extraction of the nickel into the solution at simplification of the production method.
2 cl, 3 tbl, 4 ex
FIELD: precious metal technologies.
SUBSTANCE: invention relates to recovery of precious metals from of sulfuric acid production ash waste obtained from sulfuric pyrite firing stage. Method contemplates mixing ashes with a reagent, irradiating resulting mixture by microwave field, and separating it into non-magnetic residue and magnetic fraction. The latter is treated with acid and/or oxidant solution. Precious metals are sorbed from solution and suspension obtained by a sorbent, which is further burned off to give concentrate of precious metals containing notably Pt, Pd, Rh, Au, and Ag. Above-mentioned reagent is selected from potassium hydroxide and mixtures thereof with sodium formate or sodium carbonate, or potassium nitrate, or with oxalic acid, mixtures of oxalic acid with sodium formate, zinc powder with tin dichloride, and sodium peroxide with sodium carbonate. Sorbent is selected from 1,1-bis(perhydro-1,3,5-dithiazinin-5-yl)ethane, 1-hydroxy-2-(perhydro-1,3,5-dithiazinin-5-yl)ethane, 2-(perhydro-1,3,5-dithiazinin-5-yl)acetic acid, and polydithiopropane.
EFFECT: increased degree of Pt, Pd, and Rh recovery from ash pyrites.
6 cl, 1 tbl
FIELD: extraction of valuable metals from super-alloys by electrochemical decomposition.
SUBSTANCE: super-alloy is used as both electrodes, anode and cathode. Electrochemical decomposition is realized at changing polarity of electric current with frequency 0.005 - 5 Hz while using non-organic acid as electrolyte.
EFFECT: possibility for extracting valuable metals in industrial scale, lowered cost of simplified extraction process, effective solution of part of metals, separation of metal groups.
6 cl, 2 dwg, 1 ex
FIELD: hydrometallurgical processing of sludges, for example electrolysis sludges of copper-nickel process.
SUBSTANCE: proposed method includes treatment of sludges by oxidant in acid medium for converting silver into solution. Prior to treatment of sludges, they are reduced for converting silver and platinoids into metal powders; treatment is carried out in sulfamic acid medium. Used as oxidant is hydrogen peroxide of potassium or ammonium persulfate; treatment is accompanied by heating. Proposed method makes it possible to separate and clean silver from non-noble metals and accompanying metal of platinum group and gold due to obtaining selective solutions concentrated in silver.
EFFECT: chemically and ecologically safe technology; low cost of reagents.
2 cl, 2 tbl, 2 ex
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
SUBSTANCE: invention refers to hydrometallurgy, particularly to facility for extraction of precious metals, notably, gold and silver out of tails and other materials with high contents of fine fractions. The facility consists of a solution proof base and a border and also of a drainage system. The drainage system is made in form of a perforated tube with a gate at a discharge end. On the solution proof base there are successively laid: a layer of crushed stone of 2-5 mm size and of 150-200 mm thickness, then a layer of crushed stone of 5-40 mm size and 300-600 mm thickness, in the central part of which the perforated tube is located, then there is a layer of fabric out of geotextiles and a layer of crushed stone of 2-5 mm size and of 200-300 mm thickness; also the solution proof base is made with counter incline of 3-5° from each side from two counter borders into the direction of the perforated tube and also with the incline to horizon of 2-4° into the direction of the discharge end of the perforated tube in a vertical plane passing through the central longitudinal axis of the perforated tube.
EFFECT: facilitating extraction of precious metals out of materials with high contents of fine fractions and also simplification and reduction in cost of facility and its operation.
SUBSTANCE: invention concerns method of golden-antimonial-arsenical sulphide concentrates processing. Method includes melting of concentrates into slag and matte with gold concentration in matte and with condensation of formed arsenious sublimate and gold extraction from melted matte by antimony melt. At that before gold extraction into matte after separation of slag it is introduced soda at stoichiometric ratio to sulphide of antimony 3:1. Gold extraction is implemented by means of feeding matte melt in disperse state under antimony melt.
EFFECT: increasing of complex extraction level of valuable components from concentrate, in increasing of gold extraction speed, in reduction of materials consumption and equipment level of sophistication.
4 cl, 1 ex
SUBSTANCE: invention concerns method of gold-bearing sulfide concentrates bacterial oxidation by hydrometallurgy method at gold receiving with usage of microorganisms. Method includes three-stage oxidation of concentrate by means of microorganisms' aggregation at speed of pulp passage, not exceeding reproduction rate of microorganisms' aggregation. Into concentrate it is added sulfuric acid in amount not more than 1:100 at chemical ratio of iron and arsenic (Fe/As) less than 2.9, from 1:100 till 2:100 at ratio Fe/As from 3.4 till 3.5, from 2:100 till 3:100 at ratio Fe/As from 3.6 till 3.9. At that not less than 70% of sulfuric acid of its total amount is added to sulfide concentrate at stage of preliminary preparation and not more than 30% of sulfuric acid - at the first stage of oxidation.
EFFECT: increasing of sulfides oxidation rate and expansion of manufacturing capabilities of the method.
SUBSTANCE: invention concerns hydrometallurgy of nonferrous and noble metals, mainly extraction of copper and gold from sulfur wastes which are wastes from sulfuric acid manufacturing, and can be used at dense, cuvet and percolation leaching. Method includes piling of sulfur wastes to antifilter basis, influence upon it of precipitations during its storage, collection of underspoil acid water, its additional if necessary acidation by sulfuric acid and copper leaching at values of pH and Eh of productional solutions 2.0-2.5 and 500-540 mV respectively. After reduction of copper concentration less than 100 mg/l there are reduced content of oxidant and acid in leaching solution, thiocarbamide is introduced in it, noble metals are leached, and mainly it is gold. Extracted in solution copper and gold are isolated by cementation.
EFFECT: reduction of reagent unit discharge, expenditures of energy and increasing of copper and gold extraction ratio.
4 cl, 6 tbl, 6 ex
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.