Method of processing zinc and germanium containing solid phase polymetallic mineral material
SUBSTANCE: method includes leaching of material with water solution of chemical reagent and successive treatment of produced pulp for extraction of germanium and zinc. At that leaching is carried out with mechanical, grinding and disintegrating effect, using as solution chemical reagent of solution, containing oxidant at amount from 1.8 to 2.5 kg per 1 kg of germanium contained in source material and hydroxide of alkali metal at amount maintaining medium pH from 12 to 14 at ratio of solid and liquid phases 1:(3-8). Germanium is sorption settled out of produced pulp by means of transmission of pulp through ion exchanging resin; alkali at amount facilitating 13.5-14 pH of medium and water at amount facilitating ratio of solid and liquid phases 1:(5-8) are added to pulp. Product received after sorption sedimentation of germanium is treated in autoclave at temperature of 120-250°C and pressure of 6-40 atm. Then liquid phase is separated out of which zinc is extracted while germanium is eluated out of ion exchanging resin. Germanium is extracted out of produced eluate.
EFFECT: increased degree of germanium and zinc extraction.
4 cl, 2 ex
The invention relates to the field of metallurgy of non-ferrous metals, and in particular to methods of hydrometallurgical processing of zinc - and germanium-containing solid phase polymetallic mineral materials with the purpose of allocation of them germanium and zinc.
At present, the urgent task is the development of technological processes for extraction of valuable man-made elements, such as germanium and zinc from low-grade ores, as well as from secondary products pyrometallurgical production of non-ferrous metals (toxins, dust, and other wastes pyrometallurgical production).
As mentioned above, the initial products are difficultly soluble solid materials containing germanium and zinc in the form of a range of chemical compounds, as well as many other related chemical elements and compounds, it is necessary to develop a special multi-stage methods of selective extraction of zinc and Germany, the main purpose of which is to increase the degree of extraction.
A method of refining slag copper production with the aim of obtaining them from Germany and zinc [Angelican, Bggarden. Metallurgy of rare metals. M., 1991, 258], which includes blowing through rasplavlennyi slag coal dust from the air (the capacity of fuming process), in which Germanii zinc are extracted in the form of oxides and concentrated in action.
This method is characterised by a high degree of extraction of target components, however, it requires high energy costs.
More economical from the point of view of energy costs are hydrometallurgical processing methods above source materials in order to obtain the desired products, in particular Germany and zinc, including the dissolution of the extracted component in the leachate selectively applicable reagent, if possible without affecting the other components of the feedstock.
Thus, in particular, a method of refining copper dust production with the purpose of allocation of the specified material is germanium and zinc [Izv. Non-ferrous metallurgy, No. 3, 2006, s.43], selected by the authors as the nearest equivalent.
According to this method is carried out leaching of the source material with a solution of sulfuric acid of a concentration of 0.2 mol/DM3when the ratio of the solid and liquid phases of 1:3, and then the resulting slurry is used for the selective extraction of germanium and zinc.
This method extracts the 65-85% Germany and 75-85% of zinc, which is not high enough, high indicator.
The task of the invention is to provide a method of processing solid-phase polymetallic mineral material on specialsee the extraction of germanium and zinc to enhance retrieval.
The invention consists in that in the method of processing zinc and germanium-containing solid phase polymetallic mineral material comprising leaching the material with an aqueous solution of a chemical reagent at a certain ratio of solid and liquid phases and the subsequent processing of the pulp with the aim of obtaining products used to allocate Germany and zinc, according to the invention in the process of leaching the material to have a mechanical attrition and dezintegriruetsja effects as a chemical reagent use a solution comprising an oxidizing agent in an amount of from 1.8 to 2.5 kg per 1 kg of Germany contained in the composition of the material, and the alkali metal hydroxide in an amount to provide a pH environment from 12 to 14, the process of leaching is carried out at a ratio of solid and liquid phases 1:(3-8), then perform the sorption precipitation of Germany from the obtained slurry by passing through the ion exchange resin when added to a slurry of alkali in an amount to provide a pH environment of 13.5-14, and water in an amount to provide a ratio of the solid and liquid phases 1:(5-8), obtained after sorption deposition Germany product is treated in an autoclave at a temperature of 120-250°and the pressure 6-40 ATM, followed by the separation of the liquid phase, which is used for the ejecta is it zinc and germanium elute from the ion exchange resin and use the resulting eluate to highlight Germany from it.
In the particular case of carrying out the invention germanium elute 1,1-5,0 N. hydrochloric acid and the resulting eluate produce germanium as germanium dioxide by heating the eluate to a temperature of not more than 90°, separation of the gas phase, washing it in the column for carrying out hydrolysis and drying of the precipitated sludge.
As a result of experimental studies by the authors of the claimed invention was developed multistage process of processing various types of polymetallic mineral materials, providing a selection of them germanium and zinc to enhance retrieval.
According to the proposed method the leaching process of starting material chemical reagent is carried out in conditions providing dezintegriruetsja and abrasive effect on the material being processed, resulting in the development and activation of the surface of its particles, and a quick update of the contact surface of the liquid and solid phases, which contributes to the intensification occurring during leaching of chemical reactions.
Selected by the authors for leaching as a chemical reagent solution comprising an oxidizing agent in an amount of from 1.8 to 2.5 kg per 1 kg of Germany, containing the gosia in the composition of the material, and the alkali metal hydroxide in an amount to provide a pH environment from 12 to 14, and the ratio of solid and liquid phases, is equal to 1:(3-8), which is in the process of leaching, determine the course of chemical processes, providing at this stage is extremely high degree of extraction of germanium in the form of water-soluble compounds of Germany, formed in the leaching process and output at this stage in the liquid phase.
Selected conditions the leaching also provide extraction from the source material, a significant part of the zinc in the form of its water-soluble compounds.
As shown by the results of the tests, the leaching of the source material in compliance with the totality of the above conditions provides already at this stage of the process of selective extraction into the liquid phase before (97-99)% in Germany and 60% zinc.
Dezintegriruetsja and abrasive effect on the treated material during leaching can be achieved, in particular, by conducting the process in a planetary mill.
As part of the chemical oxidant may be used, in particular, sodium hypochlorite, hydrogen peroxide.
Welcome sorption deposition Germany resulting from the leaching process of the pulp by her about what Askania through ion-exchange resin allows you to selectively separate the compounds of germanium from other components of the pulp. This process conditions the sorption deposition Germany, namely the value of pH of 13.5-14 and the ratio of solid and liquid phases 1:(5-8), selected by the authors experimentally and are optimal from the point of view of completeness sorption Germany on the surface of the ion-exchange resin. These values of pH and the ratio of solid and liquid phases is provided by adding to the pulp of the necessary amounts, respectively, of alkali metal hydroxide and water.
For sorption deposition Germany can be used in a variety of ion-exchange resin capable of selectively adsorb germanium, in particular ion exchange resin is a weakly basic type with a secondary or tertiary amine active functional groups, macroporous polystyrene chelate weakly basic anion exchange resin, and others.
When the autoclave is received after sorption deposition Germany product, which is passed through an ion-exchange resin mixture is dissolved in the leaching of solid particles and the liquid phase, the process of hydrothermal allocation remaining in the solid phase composition of zinc in a liquid phase. Modes of autoclave processing of the specified product, namely the temperature of 120-250°and pressure 6-40 ATM chosen by the authors experimentally and are protected areas the normal from the point of view of completeness and selectivity excretion of zinc in a liquid phase.
The Department specified the liquid phase from the solid phase products, for example, by filtering allows to obtain a liquid product containing the extracted at the previous stages of the process the zinc and continue to use this product for separation of zinc in various known ways.
The extraction of the ion-exchange resin Germany carried by leaching from the surface of the ion-exchange resin with a solution of chemicals, providing desorption Germany, and further isolated germanium obtained from the eluate of various known methods.
The target product in the process of separating zinc according to the claimed method may be zinc oxide, which is obtained by carbonization separated after autoclave treatment product liquid phase, separating precipitated sludge, the process of decarbonization precipitated product and drying.
The target product in the process of allocation of Germany according to the claimed method may be Germany dioxide, which is obtained by desorption Germany from the surface of the ion-exchange resin with alkali solution with a concentration of from 5 to 30 wt.%, acidification of the resulting eluate to a pH of 6.5-7.5, the Department dropped the precipitate and drying.
Dioxide Germany as the target product can be obtained by desorption Germany from the surface of incommen the second resin 1,1-5,0 N. solution of hydrochloric acid, heating the resulting eluate to a temperature of not more than 90°, separation of the gas phase, washing the obtained gas-phase product in the column and drying of the precipitated sludge.
The method is as follows.
The original zinc - and germanium-containing solid phase polymetallic mineral material subjected to leaching under conditions providing mechanical attrition and dezintegriruetsja effect on the material. The process, in particular, is carried out in a planetary mill, which serves lump or powdered source material, and an aqueous solution including the oxidant in an amount of from 1.8 to 2.5 kg per 1 kg of Germany contained in the composition of the material, and the alkali metal hydroxide in an amount to provide a pH environment from 12 to 14. In the mill on the material affected by high dynamic loads (>20 G)with heating of the reaction mass up to 70-95°and crushing, grinding and abrasion of the processed material, as a result he goes in fine condition (degree of dispersion of the order of 10-40 μm). The leaching process is carried out at a ratio of solid and liquid phases 1:(3-8), that is, the estimated amount of water in solution. During the leaching process is from 5 minutes to 4 hours.
The pulp obtained n the stage of leaching, passed through ion-exchange resin in order sorption deposition Germany, for example through the cassette with ion exchange resin, is installed in the reactor. The process is carried out by adding to the pulp alkali in an amount to provide a pH environment of 13.5-14, and water in an amount to provide a ratio of the solid and liquid phases 1:(5-8). When this slurry is passed through a cartridge in the mode of counter-current relative to the flow of an aqueous solution of alkali.
Received after sorption deposition Germany product is fed into the autoclave, where it is held hydrothermal treatment at a temperature of 120-250°and the pressure 6-40 psi for 40 min - 4 h received after autoclave treatment product is separated liquid phase, for example, by vacuum filtration. The liquid phase used for separation of zinc from it.
Germanium elute from the ion exchange resin and use the resulting eluate to highlight Germany from it.
The possibility of the method shown in the examples of specific performance.
As source material used conveyor polymetallic lead slag production, containing according to mass spectral analysis 5 wt.% zinc and 0.04 wt.% Germany.
In the planetary mill downloaded the original slag in the amount of 100 kg was applied an aqueous solution containing 10 g/l of hypochlorite is the atrium, in the amount determined at the rate of 2 kg of sodium hypochlorite for 1 kg of Germany contained in the composition of the slag. In the planetary mill was also downloaded sodium hydroxide in an amount to provide a pH environment of 13.5. The ratio of solid and liquid phases in the reaction medium was 1:4. During the leaching process was about 50 minutes
The pulp obtained in the leaching step, was sent into the reactor by passing it through a set in the reactor cassette with macroporous weakly basic polystyrene anion exchange resin brand D403, when it comes to the slurry was added sodium hydroxide in an amount to provide a pH environment is equal to 14, and water in an amount to provide a ratio of the solid and liquid phases of 1:6. The slurry was passed through a cartridge in the countercurrent mode with respect to aqueous alkali solution.
Received after sorption deposition Germany product was applied to the autoclave, where it was held by hydrothermal treatment at a temperature of 220°and a pressure of 30 psi for 2 hours. Received after autoclave treatment product was separated liquid phase by vacuum filtration.
The filtered liquid phase is sent to a two-column carbonization working in the froth regime. As carbonizing agent used carbon dioxide. As a result of carbonization received Zn(OH)sub> 2CO3, which was subjected to decarbonization by heating up to 300°and obtained as the final product is zinc oxide. The output of zinc in relation to its content in the original slag was of 99.97%.
To extract the precipitated resin Germany cassette with anion exchange resin was soaked in a 20% sodium hydroxide solution, and then washed the cartridge with water. The obtained eluate was acidified to pH=7, while in the sediment fell dowolny dioxide, Germany. The precipitate was filtered, was carried out by drying and calcination at t=300°C.
The quality of the final product was obtained dioxide, Germany. The output of Germany in relation to its content in the original slag was 99.95%.
Used the same raw material as in example 1.
In the planetary mill downloaded the original slag and filed an aqueous solution containing 30% hydrogen peroxide solution in an amount determined based 2.4 kg of hydrogen peroxide per 1 kg of Germany, in the composition of the slag. In the planetary mill was also downloaded sodium hydroxide in an amount to provide a pH environment of 13.8. The ratio of solid and liquid phases in the reaction medium was 1:5. During the leaching process was 30 minutes
The pulp obtained in the leaching step, was sent into the reactor by passing it through a set is left in the reactor cassette with macroporous weakly basic polystyrene anion exchange resin brand D403, to the slurry was added sodium hydroxide in an amount to provide a pH environment is equal to 14, and water in an amount to provide a ratio of the solid and liquid phases of 1:6. The slurry was passed through a cartridge in the countercurrent mode with respect to aqueous alkali solution.
Received after sorption deposition Germany product was applied to the autoclave, where it was held by hydrothermal treatment at a temperature of 220°and a pressure of 30 psi for 2 hours. Received after autoclave treatment product was separated liquid phase by vacuum filtration.
The filtered liquid phase is sent to a two-column carbonization working in the froth regime. As carbonizing agent used carbon dioxide. As a result of carbonization received Zn(OH)2CO3, which was subjected to decarbonization by heating up to 300°and obtained as the final product is zinc oxide. The output of zinc in relation to its content in the original slag was 99,90%.
To extract the precipitated resin Germany cassette with anion exchange resin was soaked in 1.5 N. hydrochloric acid, and then washed the cartridge with water. The obtained eluate was heated to a temperature of 85-90°C, resulting in the tetrachloride Germany was allocated in the form of gas, which is sent to a column for carrying out the process of the Hydra is Lisa with subsequent separation of the precipitated precipitate and drying.
As of the end product received dioxide, Germany. The output of Germany in relation to its content in the original slag was of 99.97%.
1. A method of processing zinc and germanium-containing solid phase polymetallic mineral material comprising leaching the material with an aqueous solution of the chemical reagent and the subsequent processing of the obtained slurry for separation of germanium and zinc, wherein the leaching is carried out with mechanical, abrasive and dezintegriraat the impact of using the solution of the chemical reagent solution containing an oxidizing agent in an amount of from 1.8 to 2.5 kg per 1 kg of Germany contained in the original material, and the alkali metal hydroxide in an amount to provide a pH environment from 12 to 14, when the ratio of the solid and liquid phases 1:(3-8), from the obtained pulp perform sorption deposition Germany by passing it through an ion-exchange resin when added to a slurry of alkali in an amount to provide a pH environment of 13.5-14, and water in an amount to provide a ratio of the solid and liquid phases 1:(5-8), obtained after sorption deposition Germany product is treated in an autoclave at a temperature of 120-250°and the pressure 6-40 ATM and separate the liquid phase from which secrete zinc, and ion-exchange resin elute germanium and from the obtained eluate in the really germanium.
2. The method according to claim 1, characterized in that the zinc is isolated in the form of zinc oxide by carbonization of the liquid phase and separating precipitated sludge, its decarbonisation and drying.
3. The method according to claim 1, characterized in that the germanium elute with alkali solution with a concentration of from 5 to 30 wt.% and separated from the eluate germanium as germanium dioxide by acidification of the eluate to a pH of 6.5-7.5, the Department dropped the precipitate and drying.
4. The method according to claim 1, characterized in that the germanium elute 1,1-5,0 N. hydrochloric acid and the resulting eluate produce germanium as germanium dioxide by heating the eluate to a temperature of not more than 90°, separation of the gas phase, washing it in the column for carrying out hydrolysis and drying of the precipitated sludge.
FIELD: mining engineering.
SUBSTANCE: invention can be used in recovery technology of sparse metals from slags of copper-lead-zinc sulphide ores. Germanium recovery method from solutions of complex ore processed slag opening includes autoclave opening with alkali liquor with concentration of 20 mass. % at temperature 200÷220°C, filtration with germanium and zinc solution separation from cake. One makes selective sorption of germanium with alkali concentration in solution 2-8 mass. % on weakly basic anion exchanger resin.
EFFECT: germanium selective sorption on weakly basic anion exchanger resin from high alkaline solutions and possibility of zinc oxide receiving with the help of carbonisation of zinc solution tempering its main salt.
2 dwg, 2 tbl
SUBSTANCE: coal hydrogenization takes place in the presence of a catalyst comprising a molybdenum compound as a transition metal. Products of the coal hydrogenization are separated into liquid fractions and a solid residue that contains said transition metal. Sludge from the coal hydrogenization is mixed up with limestone and low-grade coal, and then incinerated. The liquid fractions are distilled and disposed of. Fly ash formed from burning the solid residue is collected and treated with a mixture of ammonia and ammonium carbonate. An obtained suspension is filtered and molybdenum compounds are extracted thereof in the form of an aqueous solution that is reused as a component of the catalyst for the coal hydrogenization. A solid residue from the suspension filtration comprising trace rare elements is treated with hydrochloric acid while being heated and then said trace rare elements are extracted thereof by a solution of three-n-butyl phosphate in kerosene oil.
EFFECT: invention allows combining the process of catalyst reactivation with the extraction of trace rare elements.
FIELD: rare metal technology.
SUBSTANCE: method comprises precipitation of germanium in the form of scarcely dissoluble organic derivatives with mixture of hydroxycarboxylic acid and long-chain amine, the former, in particular, being tartaric, citric, or oxalic acid and the latter N-cetylpyridinium chloride or alkyldimethylbenzylammonium chloride at molar proportion of 2 to 6 per mole germanium. Method can be applied in processing of germanium-containing solutions and ammonia-tar liquors in by-product-coking industry.
EFFECT: increased degree of recovery and concentration of germanium, reduced consumption of reagents.
3 cl, 6 tbl, 5 ex
FIELD: chemical and metallurgical industry branches, possibly producing germanium concentrate from coals.
SUBSTANCE: method comprises steps of subjecting coal in the form of coal layers to heat treatment in shaft type apparatus by supplying air to lower part of said apparatus and heating upper layer of coal till its burning temperature. After creating stable burning zone heating of upper zone is interrupted and temperature in burning layer is kept no less than 1000°C and temperature in calcined layer is kept no less than 700°C. Motion rate of burning zone is sustained due to controlling air flow rate at specific feed of air 250 -300 nm3/m2 h. When burning zone achieves lower part of apparatus air feed is interrupted.
EFFECT: increased degree of germanium extraction from coals without pyro-metallurgical concentration of germanium concentrate.
FIELD: isotopic enrichment technologies.
SUBSTANCE: method, which can be applied in nuclear physics and biomedical research, resides in that isotope-enriched germanium tetrafluoride fraction is dissolved in ethanol/carbon tetrachloride mixture in presence of completing agent, e.g. citric acid. To resulting solution, hydrogen peroxide solution and nitric acid are added, after which mixture obtained is evaporated until dry. Dry residue is calcined and reduced into germanium with hydrogen. Yield of germanium is 97% and chemical purity 99,9%.
EFFECT: increased productivity of process.
5 cl, 4 ex
SUBSTANCE: invention refers to extraction and concentration of thorium out of process waste of loparit concentrates treatment - spent melt of saline sprinkler filter (SSF) of loparit concentrate chlorination process. The method includes preparation of suspension by means of discharge of spent melt of saline sprinkler filter (SSF) into water, incorporation of high molecular flocculant, of holding, filtering, separation of sediment, obtaining of chloride solution, and of treatment with steel scrap and metal magnesium. Prior to obtaining chloride solution the source suspension is heated to 60-90°C and treated with solution of sodium hydroxide to pH 1.5-2.0 and to 0.1-0.3% solution of high molecular flocculant at amount of 3-5% from the source volume of suspension; then suspension is held for 2-4 hrs. Chloride solution is received by means of filtration of spent suspension obtaining sediment of rare metals; chloride solution is then treated with steel scrap and metal magnesium; at that the solution is successively treated first with the steel scrap at amount of 3-5 mass fractions of iron per 1 fraction of iron ions (III) in chloride solution at 80-100°C for 1-3 hrs till achieving the value of pH in a pulp equal to 3.0-3.5. Then the pulp is separated from the non-reacted portion of the steel scrap and is treated with metal magnesium to pH 3.5-4.5, and further with 0.1-0.3% solution of high molecular flocculant taken at amount of 5-20% from the volume of chloride solution. Thus produced pulp is held without mixing for 1-4 hrs and filtered producing thorium containing sediment; the said sediment is washed at filter first with solution containing 1-5 g/dcm3 of sodium sulphite, then with water. Washed out sediment is repulped in solution of sodium hydroxide with concentration of 50-150g/dcm3 at a ratio of "Ж:Т"=3-5 at 60-90°C for 2-3 hrs, after what the pulp is filtered with separation of alkaline filtrate. Thorium containing sediment at the filter is washed with water, pressed at the filter and dried; the alkaline filtrate and process water are merged and mixed, then heated to 80-90°C, and treated with solution of sodium hydroxide to pH 11-13 with production of hydroxide pulp. Hydroxide pulp is filtered and then radioactive sediment is produced at the filter; it is washed out with water and transferred to a special wastes depositary, while filtrate is mixed with 10-20 volumes of shop flush water, heated to 80-90°C and again treated with solution of sodium hydroxide to pH 11-13. Obtained pulp is held and filtered thus producing sediment of rare metals and deactivated chloride solution which is discharged to drainage. Sediment of rare metals is unloaded from the filter, merged with sediment of rare metals extracted from the source suspension, dried, washed out and then transferred for preparation of charge for its further chlorination together with the loparit concentrate.
EFFECT: upgraded efficiency of thorium extraction and simultaneously solving problem of neutralisation and utilisation of process waste.
1 dwg, 1 ex
SUBSTANCE: invention refers to non-ferrous metallurgy and can be used for extraction of vanadium out of ashes which is waste produced by burning of sulphuric vanadium containing black oil in heat engines of heat and hydropower stations. The method consists in the following: source ashes are mixed with sodium carbonate and water at a weight ratio of 100:(10-60):(30-50), then produced mixture is held at temperature of 100-150°C, preferably 115-120°C, during 2 hours. Vanadium is leached out of produced self-diffusing cake with water at temperature of 95-100° and a ratio of liquid: solid = (1.5-3):1.
EFFECT: avoiding of generating harmful gas exhausts at extraction of vanadium and implementation of available equipment.
1 tbl, 2 ex
SUBSTANCE: method for pile loosening by blasting in heap leaching (HP) of ores is used to intensify the HP process due to performing drilling-and-blasting works. The method for pile loosening by blasting in heap leaching of ores, whereby a pad is formed by protective drainage 14 and damp-proof layers 15 made of polymeric film, consists in drilling boreholes 2, placing low-density explosive charges into the boreholes 2 and blasting of said charges. The boreholes 2 are drilled to the depth of the protective and drainage layer 14, charges 9 and 12 are distributedly disposed in the boreholes 2. Pieces 13 and 11 of an expanded material, e.g., foamed polystyrene, are placed respectively in the lower part of the borehole and between the charges. The charges are blasted with time delaying beginning from the top charge 9 to the bottom one 12.
EFFECT: increase in the efficiency of ore loosening; prevention of damage of the anti-seepage polymeric film membrane and of penetration of the toxic solution into ground waters.
SUBSTANCE: said utility invention relates to the field of noble metal metallurgy, in particular, to methods of recovery of osmium from non-ferrous metallurgy platinum-containing electrolytic slime processing products, namely, cakes containing selenium and non-ferrous metals. The cake is subjected to preliminary caustic treatment with caustic soda solution with a concentration of 180-220 g/dm3, and the residual matter resulting from the separation is heated at a temperature of 100 to 130°C. The heated residual matter is subjected to treatment with sulphuric acid and secondary caustic treatment. The osmium concentrate resulting from the caustic treatment is sent for the distillation of the osmium tetraoxide, with its recovery using ammonia solution and subsequent preparation of osmium salt.
EFFECT: increase in efficiency and maximum simplification of osmium recovery process.
4 cl, 3 dwg, 1 tbl, 11 ex
FIELD: hydrometallurgy and mining industry; ecological methods of extraction of metals.
SUBSTANCE: proposed method of extraction of metals from solid metal-containing materials or ores includes treatment or underground leaching-out with solution of reagent obtained by electrolysis treatment of solution containing halogenide-anion and separation of metal from this solution. Electrolysis treatment is carried out under condition of positive mass transfer on revolving electrode or on electrode moving at acceleration of no less than 0.1 m/s. After electrolysis treatment, water-soluble polymer used as surfactant is introduced into reagent solution in the amount of no less than 0.01%.
EFFECT: enhanced efficiency and ecological safety due to reduced power requirements, intensification of process, avoidance of toxic emissions and use of safe chemicals.
7 cl, 2 dwg, 6 ex
FIELD: hydrometallurgy of extraction of non-ferrous, rare-earth and noble metals from rebellious raw materials containing natural carbon or other rebellious compounds.
SUBSTANCE: proposed method includes treatment of rebellious carbon-containing mineral raw material by oxygen-containing oxidant followed by extraction of noble metal compounds from liquid phase. Treatment of carbon-containing mineral raw material by oxygen-containing oxidant is carried out in presence of reductants possessing donor-acceptor properties which are expressed in the fact that at first stage of chemical reactions, reductants give off their electrons to oxygen-containing oxidant, forming stronger oxidant as compared with first one in form of short-lived radicals and intermediate products of oxidation of donor-acceptor reductants which are also used as oxidants.
EFFECT: increased extraction of non-ferrous, rare-earth and noble metals; low cost of process.
FIELD: non-ferrous metallurgy; pressure hydrometallurgy and processing of oxidized silicate nickel ores enriched with magnesium.
SUBSTANCE: proposed method includes sulfidizing stage and oxidizing stage with the use of elemental sulfur at the sulfidizing stage in form of aqueous suspension and oxygen at the oxidizing stage. At the sulfidizing stage, use is made of solution of sulfates with bivalent cation and surfactant which facilitates hydrophilization of elemental sulfur; surfactant is fed to suspension at grinding the sulfur which makes it possible to perform both stages of pressure leaching at temperature below 200°C and total pressure in autoclave below 2.0 Mpa, thus ensuring high extraction of nickel into solution up to 93-97%.
EFFECT: considerable reduction of pressure leaching temperature and total pressure in autoclave at high extraction of nickel into solution.
2 cl, 4 ex
FIELD: leaching extraction of non-ferrous and precious metals from refractory ores by cyaniding process.
SUBSTANCE: method involves cyclical or continuous leaching of metal from ore-containing pulp; supersonic processing; collecting and processing pregnant solution; providing supersonic processing at cyclical leaching after first leaching process and at continuous leaching - before first leaching process by exposing to supersonic field having intensity of 1-70x104 W/m2 in hydrodynamic generator and simultaneously feeding air. Method allows efficiency of metal extraction process to be increased due to fundamental changing of supersonic process parameters, in particular, supersonic field intensity, increased concentration of solved and dispersed gaseous oxygen and products of acoustic-chemical reactions in pulp, and additional grinding of ore grain.
EFFECT: increased efficiency of process and reduced labor intensity due to the fact that generator functions in self-oscillating operational mode and does not need additional works, and simplified process.
FIELD: technology of processing uranium-and fluorine-containing wastes.
SUBSTANCE: proposed method includes preparation of solutions from wastes, concentration of solutions by sedimentation of uranium followed by dissolving of sediments in nitric acid, extraction conversion of concentrated solutions with the use of tributyl phosphate in hydrocarbon thinner and sedimentation of ammonium polyuranates from re-extracts thus obtained. Sedimentation of uranium at stage of concentration is performed with the use of sodium hydroxide at pH= 9-10 and temperature of 60-90C. Proposed method enhances purification of uranium from fluorine due to enhanced sedimentation and filtration properties of sediments at concentration stage. Content of admixtures in triuranium octa-oxide powders obtained from re-extracts by sedimentation of ammonium polyuranates and subsequent calcination does not exceed specified norms.
EFFECT: enhanced efficiency.
1 dwg, 2 tbl, 1 ex
FIELD: ferrous and precious metallurgy, in particular, processes for extraction of precious metals from affinage production wastes.
SUBSTANCE: method involves leaching out material containing precious metals and lead with the use of sulfuric acid solution having concentration of 150-300 g/l; subjecting sulfuric acid leaching cake to leaching out in sodium chloride solution without addition of sulfuric acid. Method allows lead to be more completely extracted from processing circuit.
EFFECT: provision for producing of stable lead-containing solutions, and improved quality of platinum metal concentrates.
1 tbl, 7 ex
SUBSTANCE: method includes mixing of source concentrate with calcium oxide CaO and calcium peroxide CaO2 and burning in two stages. At the first stage burning is carried out at temperature of 350-500°C within 30-40 minutes, at the second stage - at temperature of 500-800°C during 30-60 minutes. After burning there is performed leaching of non-ferrous metals out of cinder. Consumption of calcium oxide CaO is 50-100% from stoichometric required for binding sulphur into gypsum while consumption of calcium peroxide CaO2 is 1-10% from concentrate weight.
EFFECT: increased extraction of non-ferrous metals and reduced duration of cinder leaching.
2 cl, 2 tbl, 2 ex