Neutralisation technique of metallic mercury by immobilisation
SUBSTANCE: invention concerns industrial sanitation and environmental protection field, at usage in manufacturing and in domestic conditions of metallic mercury, its containing devices and facilities, and also of amalgams, and is intended for neutralisation of mercury at its ingress both on surfaces of different materials and into volumes (material, brick, concrete and so forth). Neutralisation technique of metallic mercury by immobilisation includes its oxidation by means of treatment by water solution of hydrogen peroxide. At that additionally to oxidation it is implemented mercury deposition by means of simultaneous or successive treatment by water solution of reagent, transferring metallic mercury into insoluble or sparingly soluble in water compound of natural or anthropogenic composition. In the capacity of reagent there are used water-soluble compounds of alkaline or alkaline-earth metals for instance, sulphates, phosphates or carbonates.
EFFECT: effectiveness increase of process at excluding of mercury - organic compounds formation.
5 cl, 5 ex
The invention relates to the field of industrial hygiene and environmental protection when used in the production and living conditions of metallic mercury containing devices, as well as amalgam, and is intended for disposal of mercury when released it as open surfaces of various materials and volumes (soil, brick, concrete etc).
It is known that metallic mercury is a substance of the first class of danger. Particularly dangerous mercury vapors and assimilated by living organisms through the respiratory organs in the process of aspiration.
It is also known that due to the high vapor pressure of mercury over its surface (even under water) concentration in the air at ordinary temperature may exceed the permissible in the residential area the size of the MPC (maximum permissible concentration) most nearly 45 thousand times. Due to this the number one priority when conducting demercurization of mercury contaminated surfaces and/or volumes is full mechanical or thermal destruction of metallic mercury or its translation in a fixed form stable chemical compounds (immobilization) with subsequent disposal of the latter.
For the disposal of metallic mercury by chemical immobilization suggested and use the camping in practice a considerable number of chemicals and their compounds, able to oxidize mercury and its transfer from the metal state in a sparingly soluble (preferably insoluble) in water Sol.
The most widely represented in the literature is often used to practice the compositions and methods that transform mercury into water-insoluble sulphide form HgS similar to natural cinnabar and metacinnabar (see, for example, domestic certificates of authorship for inventions No. 1051103; No. 2175664 - composition "e-2000+"; No. 2185413 - composition "103"; patent applications No. 95105191; No. 2003105728 - composition "102A" and others).
Common drawbacks of these solutions is, on the one hand, is not high enough, the kinetics of the processes that lead either to the necessity of repeated recurrence of operations immobilization of mercury, or to the necessity of prolonged exposure to a chemical reagent to metallic mercury that ethnologica, on the other hand, the application in most cases are quite rare and not readily available reagents. In addition, when the excess sulfur-containing reagent immobilization process in certain conditions can form water-soluble polysulfides mercury HgSx.
The number of known compounds (see, for example, certificates of authorship for inventions No. 2081198; No. 2148662; No. 2240337 and others), in particular, is sometimes used in the manufacturing method of immobilization of mercury using spirtitual races the thief, aimed at the transfer of mercury in a very poorly soluble in water (˜60 mg/l) form of iodides.
The main disadvantage of these solutions is the relatively high cost of both the iodine and its compounds. In addition, iodine is a highly corrosive and toxic element.
Known also numerous compositions (see, in particular, certificates of authorship for inventions No. 1151103; No. 1678878; application for invention No. 2003106197/04 and others), including the ones described in the literature and even featured in some of the standard materials intended for oxidation of mercury by chlorine, chlorcyclizine compounds, and some chloride (ferric chloride FeCl3etc) to make it insoluble in water (˜2.0 mg/l) calomel Hg2Cl2.
The main drawback of these methods is the possibility of transformation, with significant excess oxidant monovalent mercury chloride - calomel into ferrous chloride mercury - HgCl2- mercuric chloride, which is a highly toxic substance. In addition, most oxidizing agents containing active chlorine (bleach, sodium hypochlorite, ferric chloride, dichloramine and others), often discolor, and sometimes destroy the materials machined surfaces, which in some cases is unacceptable.
In a separate group can is to be collected by known methods of immobilization of mercury compounds, produce in the course of their use of active oxygen and transferring the metallic mercury in a sparingly soluble in water (˜50 mg/l), oxide - HgO, similar to the natural montroydite (see, for example, certificates of authorship for inventions No. 266727; No. 380729; and others, as well as recommended and widely used in practice oxidants - pyrolusite MnO2, manganese-acidic potassium - KMnO4and others).
Thus, in the method of immobilization of metallic mercury copyright certificate №380729, which is an analog of the claimed invention, the oxidation of mercury is the strongest oxidizing agent is hydrogen peroxide (H2O2in the form of a molecular complex with urea, CO(NH2)2which is essentially obvious similarity to known antiseptic drug - hydropenia. The use of urea in the composition should lead to the formation of insoluble mercury-organic complex R·(HgO), where R is an organic radical formed by the molecule of urea.
The main disadvantages of this analog is inefficient, not allowing to make full immobilization of metallic mercury, as well as the probability of formation in the process are highly toxic mercury-organic compounds.
The closest to the technical nature of the claimed invention is adopted is output as a prototype method of immobilization of metallic mercury copyright certificate №266727, in which the treatment of mercury contaminated surfaces and places the accumulation of implementing a 5%aqueous solution of hydrogen peroxide H2About2.
The main disadvantage of the prototype as well as analogue, is its lack of efficiency, which does not allow the reduction of the concentration of mercury vapor over the surface to the desired limit values. In addition, created on the surface of the mercury film its oxide is unstable, as the hydrogen peroxide.
An object of the invention is to increase the efficiency of the immobilization process of metallic mercury by depositing it in the form of insoluble or sparingly soluble in water compounds with simultaneous exclusion of the probability of formation of mercury-organic compounds.
The problem is solved in that in the method of disposal of metallic mercury immobilization, including oxidation by treatment with an aqueous solution of hydrogen peroxide, according to the invention in addition to oxidation carry out the process of deposition of mercury by simultaneous or sequential treatment with an aqueous solution of reagent translating metallic mercury in an insoluble or sparingly soluble in water connection natural or man-made structure, and as a reagent used motorstore what's the connection alkaline or alkaline-earth metals, for example sulfates, phosphates or carbonates. This combination of features allows you to perform a complete immobilization of metallic mercury as a result of formation of insoluble - basic sulphate of mercury HgSO4·2HgO, similar to the natural mineral shuettite, phosphate mercury Hg3(PO4)2or very poorly soluble in water is a basic carbonate of mercury HgCO3·2HgO and, consequently, non-toxic and non-biodegradable under normal conditions of mercury compounds.
Examples of the complete method.
Example 1. The interaction of metallic mercury with hydrogen peroxide H2About2similar to the prototype.
The hanging mercury mass 4,3799 g at a temperature of 25°treated With 5 ml of 20%hydrogen peroxide H2O2. After 1-2 min of beginning the process of outgassing. After 24 hours the surface of metallic mercury was covered with a solid gray color, easily separating from mercury and passing into solution with the formation of unstable suspensions. The precipitate dark gray color is dissolved in dilute nitric acid, HNO3. Radiograph of the sediment shows that the oxidation of metallic mercury hydrogen peroxide, a precipitate of oxide of mercury (II) (HgO), the solubility of which is 49-51 mg/l H2O at 25°C.
The decline in the mass of mercury 0,01895 g with a surface area of a sample S=2,27 cm2that is Corot response of metallic mercury in a solution of hydrogen peroxide is of 20.9 mg/cm 2·h.
Example 2. The interaction of metallic mercury with hydrogen peroxide H2O2with the addition of sulfate lithium Li2SO4.
The hanging mercury mass 2,45985 g at a temperature of 25°treated With a solution containing 5 ml of 20%hydrogen peroxide and 0.5 ml of 20%aqueous solution of sulfate of lithium (Li2SO4). After 3-5 min observed intensive gassing and heating the solution to a temperature of 50-60°C. the Process of reacting flows 25 minutes, resulting in a precipitate of lemon-yellow color.
Radiograph of the sediment showed that the oxidation of metallic mercury hydrogen peroxide with the addition of lithium sulfate consists of a basic sulfate mercury (II) (HgSO4·2HgO), similar to the natural mineral shuettite, with a solubility of 30 mg/l N2At 16°C.
The decline in the mass of mercury is 0,50225 g with a surface area of a sample S=1,09 cm2the speed of response of metallic mercury in the hydrogen peroxide solution is 3300,0 mg/cm2·h.
The increase in the rate of dissolution of mercury due to the additive of lithium sulfate in comparison with example 1 (prototype) is ≈4000 times.
Example 3. The interaction of metallic mercury with hydrogen peroxide H2About2with the addition of magnesium sulfate MgSO4.
The experiment on the oxidation of metal mouth is and weight 2,45958 g 5 ml of 5%hydrogen peroxide with the addition of 0.5 ml of 20%aqueous solution of magnesium sulfate (MgSO 4) produces excessive gassing and heating the solution to a temperature of 50-60°C. the Process of reacting flows 25-30 minutes
Radiograph obtained precipitate lemon-yellow color showed the presence of oxide (HgO) and primary sulfate mercury (II) HgSO4·2HgO having a solubility ˜30 mg/l N2At 16°C.
Example 4. The interaction of metallic mercury with hydrogen peroxide (H2O2with the addition of sodium phosphate Na3(PO4).
The experiment on the oxidation of metallic mercury by weight 2,45985 g 5 ml of 5% hydrogen peroxide with the addition of 0.5 ml of 20%aqueous solution of sodium phosphate Na3(PO4). The process of reacting flows 45-60 minutes.
Radiograph obtained precipitate yellowish-white colour showed the presence of a water-insoluble phosphate of mercury Hg3(PO4)2.
Example 5. The interaction of metallic mercury with hydrogen peroxide H2About2with the addition of sodium carbonate Na2CO3and nitric acid HNO3.
After processing the sample of metallic mercury by weight 2,45985 g 5 ml of 5%hydrogen peroxide was added 0.5 ml of a 20%aqueous solution of sodium carbonate Na2CO3and 0.5 ml of 1%aqueous solution of nitric acid, HNO3.
The result was obtained red-brown precipitate of a basic carbonate of mercury (II) (HgCO3·2HgO).
In affect, the, the use of this method increases the efficiency of immobilization of metallic mercury.
1. The method of disposal of metallic mercury immobilization, including oxidation by treatment with an aqueous solution of hydrogen peroxide, characterized in that it further with oxidation simultaneously or sequentially carry out the deposition of mercury by treatment with an aqueous solution of reagent translating metallic mercury in an insoluble or sparingly soluble in water connection natural or man-made structure.
2. The method according to claim 1, characterized in that the reagent is used as a water-soluble sulfates of alkali metals.
3. The method according to claim 1, characterized in that the reagent is used as a water-soluble magnesium sulfate.
4. The method according to claim 1, characterized in that the reagent is used as a water-soluble phosphates of alkali metals.
5. The method according to claim 1, characterized in that the reagent is used as a water-soluble carbonates of alkali metals with the addition of nitric acid.
FIELD: processes and equipment for removing mercury out of liquids.
SUBSTANCE: method for removing mercury from solutions contaminated at least partially with metallic mercury comprises steps of filtering through filter of electrographite with mean size of particles in range 20 - 1000 micrometers; using electrographite with surface according to BET in range 0.5 - 10 m2/g.
EFFECT: improved effectiveness of process due to increased useful life period of filter.
5 cl, 3 tbl, 3 ex
FIELD: chemical environmental technologies.
SUBSTANCE: method comprises supplied air-assisted combustion of catalyst followed by cooling of products to condense metallic mercury. Air supplied for combustion is supplemented with water steam in amounts 3-8%.
EFFECT: increased recovery of mercury and destroyed solid toxic production waste.
1 dwg, 3 tbl, 6 ex
FIELD: heavy metal pollution elimination.
SUBSTANCE: invention is intended for use in technologies of purifying various media from mercury pollution. Demercurizer of invention contains elementary sulfur and sulfide ion source, the latter being a by-product in sodium hydroxide-mediated absorption of hydrogen sulfide and homologues thereof produced in synthesis of dialkyldithiophosphoric acid.
EFFECT: enhanced process efficiency and reduced expenses.
1 tbl, 8 ex
FIELD: environment control.
SUBSTANCE: mercury-containing luminescent lamps are broken, separated into broken glass and mercury-containing luminophor in flow of air at rarefaction of 10-100000 Pa at application of vibrations within range of 1-10000 Hz. Mercury-containing luminophor ground to sizes not exceeding 1 mm is heated in hermetic reservoir at temperature of 600-900°C at 30-min holding. Mercury vapor is condensed in cooled trap. Provision is made for dual hermetization in conducting all processes. Proposed method ensures complete utilization of luminescent lamps into metallic mercury, non-ferrous metal, glass raw material and building material which are returned into production process. Content of mercury in wastes is less than 3 ppm which is below sensitivity of modern analytical facilities.
EFFECT: facilitated procedure; increased productivity.
FIELD: ecology, in particular composition for demercurization.
SUBSTANCE: claimed composition contains sodium thiosulfate and water. Additionally it contains potassium permanganate and nitric acid in the next ratio (wt.%): potassium permanganate 0.52-0.12; sodium thiosulfate 4-6; nitric acid 0.5-1.5; and balance: water. Method for demercurization of objects infested with mercury includes treatment with abovementioned composition for 2 h followed by washing with water. Composition of present invention makes it possible to reduce mercury and mercury vapor concentration to maximum allowable concentration or lower without corrosive and toxic effects.
EFFECT: stable demercurization effect after single treatment of objects infested with mercury.
2 cl, 1 ex
FIELD: utilization of mercury-containing devices; processing rejected luminescent lamps and mercury-containing devices and devices whose service life has expired.
SUBSTANCE: plant for utilization of mercury-containing devices includes working bath, unit for breaking and treating the mercury-containing devices with liquid medium which is made in form of container with breaking devices and devices for supply of liquid medium, vibrator, working solution reservoir connected with breaking device by means of drainage pipe line laid in lowest point of working bath; plant is also provided with pipe lines equipped with fittings and pump for transfer of liquids; it is also provided with water reservoir which is connected with breaking device by means of drainage pipe line laid at definite height above bottom of working bath; working bath, water reservoir and working solution reservoir are combined in system which makes it possible to fill working bath in turn with water or with working solution by means of one pump; breaking device is made in form of cross-piece with knives secured on it. Proposed method of utilization of mercury-containing devices includes grinding of such devices under layer of water at continuous washing of luminescent substance, forming the suspension and settling mercury in form of finely-dispersed particles on bath bottom, after which mercury is subjected to neutralization with the aid of said plant. Breaking the mercury-containing devices and washing-off the luminescent substance will be performed by vibration; neutralization is accompanied by forming of insoluble calomel.
EFFECT: possibility of performing chemical demercuration at temperature close to surrounding temperature.
3 cl, 5 dwg
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
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: metal recovery, in particular noble metals from technologically proof raw materials.
SUBSTANCE: method includes raw grinding to 0.2 mm; blending with batch containing halogen salts and/or oxygen-containing salts, and mixture opening: cake cooling, leaching with simultaneous reaction pulp agitation with hot water, and metal recovery from solution and insoluble residue. Opening is carried out in electrical furnace at 100-120oC preferably at redox potential of 1.8-2.6 V, by elevating of temperature up to 450-560oC at rate of 8-10oC/min and holding for 1-7 h at highest mixture redox potential. Opened and cooled cake is grinded and leached in opened agitator.
EFFECT: environmentally friendly method with increased yield; utilization of unconventional noble and non-iron metal sources.
1 cl, 2 tbl