Method of extraction of gold, silver and copper from waste electrolytes
SUBSTANCE: invention relates to extraction method and utilisation of gold, silver and copper from waste electrolytes, containing thiourea, sulfuric acid, water and sludge. Method includes addition to waste electrolyte 33.0-67.5% hydrogen peroxide and blending with transferring of gold and silver into sediment. After appearance of green colouring in solution it is cooled and filtered. Sediment is annealed and it is received an ally of gold and silver.
EFFECT: receiving of the ability of quantitative isolation from waste electrolyte of gold and silver in the form of metals, which in what follows can be used industrial.
The technical field
The invention relates to the chemical industry, and in particular to technology for the utilization of gold, silver and copper from waste electrolytes.
The level of technology
From the patent literature known method for the recovery of silver and possibly gold from solid materials containing these elements in low concentrations, for example 1-1,5%, partly in the form of sulfides of metals, and possibly containing free sulfur. The material is treated with timesaving followed by cementation of the obtained solution of complex compounds for extraction to precipitate more than 90% of silver (U.S. Pat. UK No. 1534485, IPC SW 11/04, published. 06.12.1978 year). The disadvantage of analog is not enough efficient extraction of gold.
In order to improve the quality of products made of precious metals containing gold, silver and copper, electropolishing is used in the electrolyte composition: thiourea, sulfuric acid, water (1 l of electrolyte contains 90 g of thiourea, 20 g
H2SO4concentrated, water). The spent electrolyte consists of a solution and the precipitate (sludge) and contains up to 10% of gold, silver and copper. For the disposal of this electrolyte in practice, the use method of cementation, which consists in adding to the electrolyte of the zinc powder, which restores the noble metal ions from their complexo is with thiourea to metals in a free state. The latter are allocated zinc based (Handbook of probiere / comp.: Kida. technology. Sciences Eaaea. Ed. ing. Dggreenberg. - M.: Gosfinizdat, 1953. - 230 S.).
where T - thiourea (NF2)2CS.
This method is used for the prototype.
The disadvantage of the prototype is not effective utilization of gold and silver from the electrolyte.
Disclosure of inventions
The objective of the invention is to develop a method of extracting gold, silver and copper from spent electrolyte for electropolishing products, which would provide the technical result - the possibility of quantitative allocation of the electrolyte (liquid and sludge) gold and silver in the form of free metals, which can be further used for industrial purposes.
This technical result is achieved by the present invention offers a method of extracting gold, silver and copper from spent electrolyte containing thiourea, sulfuric acid, water and sludge, including the destruction of the complex of gold, silver and copper. For the destruction of the complexes of gold, silver and copper in the spent electrolyte add 33,0-67,5%hydrogen peroxide with stirring with the transfer of gold and silver in the residue, and copper in the solution after the appearance of the green on the or ink into the solution is cooled, filtered, the precipitate is heated to obtain an alloy of gold and silver.
In the proposed method, instead of the zinc powder is injected 33,0-67,5%hydrogen peroxide, which destroys the complexes of gold, silver and copper with thiourea. In this case there are in the free state gold and silver, copper goes into solution, and thiourea decomposes with evolution of sulfur dioxide and ammonium sulfate. The end of the reaction is fixed by the appearance of green color of the solution.
The implementation of the invention
The following example confirms the feasibility of the invention.
The alloy containing gold is 58.5%, silver 8,0%, copper of 33.5% is electro-polished in an electrolyte composition 1 l: 90 g of thiourea, 20 g of H2SO496-98% and 890-900 ml of water. To exhaust electrolyte (liquid and sludge) under stirring gradually poured in small portions 300 ml of 67.5%or 600 ml of 33%hydrogen peroxide. In reaction to the destruction of complexes of gold, silver and copper with thiourea there is a strong warming by emitting carbon dioxide.
The appearance of green color of the solution indicates the end of the reaction. After cooling, the precipitate of gold, silver and sulfur is filtered through a filter with a blue ribbon. The precipitate is placed in a retort and heated to a temperature of 800°C, sulfur is burned, and gold and silver form an alloy (2.66 g), which is used for industrial purposes.
The proposed method can be widely used for recycling of precious metals in the manufacture of articles of jewelry containing gold.
Although the present invention is described by means of embodiments thereof, the scope of the present invention is not limited to these examples, but is defined only by the claims with regard to the possible equivalents.
The method of extracting gold, silver and copper from spent electrolyte containing thiourea, sulfuric acid, water and sludge, including the destruction of the complexes of gold, silver and copper, characterized in that for the destruction of the complexes of gold, silver and copper in the spent electrolyte add 33,0-67,5%hydrogen peroxide with stirring with the transfer of gold and silver in the residue, and copper into the solution, after the appearance of the green solution is cooled, filtered, the precipitate is heated to obtain an alloy of gold and silver.
SUBSTANCE: invention relates to nonferrous and ferrous metallurgy, particularly to manufacturing of cast iron manufacturing and alumina of low-grade high-sulphur and sideritised raw materials, and also for complex treatment of red sludges of aluminium industry. Alumina-bearing raw materials are molten with reductant and following metal is extracted. After melting outside the furnace into discharged high-aluminous melt it is introduced limestone from the rate of formation in the received sludge twelve-calcium semi-aluminate 12CaO·7Al2O3 and calcium orthosilicate 2CaO·SiO2.
EFFECT: receiving of two complete products - conversion pig iron and alumocalcite sludge, to use low-grade alumina-bearing raw material, to fully treat the letter with simultaneous improvement of engineering-and-economical performance of manufacturing, and essentially decrease energy- and warm consumption.
1 dwg, 1 tbl
SUBSTANCE: briquette includes iron-containing and zinc-containing materials, and also coupling agent. In the capacity of iron-containing and zinc-containing material it is used dust of electric furnace steelmaking, and in the capacity of coupling agent it is glass. Components ratio in briquette is following, wt %: dust of gas cleaning of electric furnace steelmaking 75-97, water glass 3-25.
EFFECT: receiving of ability to utilise waste products .
SUBSTANCE: briquette includes carbon-bearing, iron-containing and zinc-containing materials and coupling agent. In the capacity of carbon-bearing material it is used domain gas cleaning sludge, iron-containing and zinc-containing materials it is used gas cleaning dust of electric furnace steelmaking, and in the capacity of coupling agent it is used water glass. Correlation of components in briquette is following, wt %: sludge of domain gas cleaning 5-30, gas cleaning dust of electric furnace steelmaking 45-92, water glass 3-25.
EFFECT: receiving of ability to utilise waste products.
SUBSTANCE: invention relates to metallurgy of nickel and cobalt, particularly to depletion method of converter slag of nickel-cobalt manufacturing with extraction of nickel and cobalt. Method includes pouring of molten slag into heated aggregate, introduction into melt of pyrite, heating; melt settling with forming of sulfide mass, containing nickel and cobalt. Then it is implemented discharge, beading and utilisation of depleted slag. Additionally pyrite into melt is introduced in mixture with quartz. Quartz weight in mixture is from 3 up to 10% to weight of depleted slag, and weight of pyrite - 5 up to 10 times exceeding weight sum of nickel and cobalt, attended in depleted slag in oxidised form. Heating is implemented at the temperature from 1200 up to 1350°C. Melt settling before discharge of depleted slag is implemented from 20 - 30 minutes.
EFFECT: portion reduction of nickel and cobalt in dump converter slag .
2 cl, 1 ex
SUBSTANCE: metallic iron concentrate, containing nonferrous and precious metals is melted at the temperature 1400-1600°C with feeding of oxygen-containing wind and not containing flux silicon with forming of metal melt and wustite dross. 70-95% of iron is transferred into the wustite dross, containing less then 5-10% SiO2, and nonferrous and precious metals - into metallic melt with following divided discharge of melt products.
EFFECT: invention provides transferring of major mass of iron into the wustite dross, and nonferrous and precious metals to concentrate in metal alloy, available for further inclusion into the technology of copper-nickel manufacturing.
4 cl, 2 tbl, 1 ex
SUBSTANCE: furnace contains cylindrical body with constant inner diametre, burner for furnace heating and shutter for compact closing of open side. Furnace body is installed on the frame, merely supported on foundation elements, at that furnace body is implemented with ability of deviation or inclination for different angles. As internal walls of furnace body allows constant diametre, it is not obligatory more to incline furnace per too big angle for teeming of molten metal, as narrow spot absence, which before operating as threshold. Air for burning is directed to burner through supply ducts into burner of fuel and air for burning, formed by damper loops or installed in those loops. Supplying system of air/fuel contains gastight revolving and knee joints, fixed to furnace and inclines and moved with furnace. Intelligence system processing parameters and regulates furnace operating.
EFFECT: invention removes problems, related to existing furnaces, increasing of metal extraction degree from wastes.
34 cl, 7 dwg, 1 tbl
SUBSTANCE: invention relates to the method of lead utilisation. Method of lead utilisation from waste accumulators includes location of undisturved lead plates with active mass of waste accumulator in electrolyte. Then it is implemented simultaneous dissolving of undisturved lead plates with active mass in electrolyte and lead electrochemical isolation. Additionally lead isolation is implemented at current density 5-15 mA/cm2. In the capacity of electrolyte it is used maleic acid.
EFFECT: providing of almost total lead utilisation from waste lead accumulators.
1 dwg, 1 tbl, 3 ex
SUBSTANCE: invention relates to ferrous metallurgy field, particularly, it relates to processing of disintegrating slag. Processing of disintegrating slag includes preliminary and final cooling, screening, dedusting and magnetic separation of decay daughter. Preliminary cooling and screening of disintegrating slag is implemented on screening grating with cells sizes from 80×80 mm till 300×300 mm with vibration action of frequency 3000-6000 vibration per minute with driving force from 2.5 till 9.0 kN. Final cooling and dedusting are implemented simultaneously in revolve drum with linear velocity of the internal surface of shell ring 0.2-0.5 m/s and rate of airflow in cavity of drum 0.6-4.0 m/s. Additionally powdered and dust-free decay products of slug is subject to magnetic separation separately.
EFFECT: reduction of cooling duration and slag disintegration, reduction of metal loss with lump and powdered slag, increasing of amount of metal production and products from slag mineral constituents.
2 cl, 1 dwg, 3 tbl
SUBSTANCE: invention relates to installation for melting of the primary and secondary aluminium with screening and collecting of slag. Facility contains rotary kiln for aluminium melting excluding usage of salt bath, inside of which there are helical element, bleed channel implemented with required inclination located in isolated chamber, allowing window between hole of rotary kiln and spherical accumulator tank located lower in blind area and outfitted by rotary joint for providing of the constant inclination of bleed channel and ability of direct and continuous pouring with metal melt into reservoir, device for automatically continuous screening and collection of melting slag, built into the facility and double system of channels for withdrawing of effluent gases.
EFFECT: provision of qualitative removing of pollutants, essential saving of energy in melting furnace, cost saving for waste treatment and maintenance and replacement of worn spots.
23 cl, 6 dwg
SUBSTANCE: invention relates to non-ferrous metallurgy field, particularly it relates to manufacturing of briquettes from secondary raw materials, particularly from secondary aluminium. Briquettes from secondary aluminium is received by pressing of mixture from grinned aluminium with admixture. In the capacity of aluminium it contains aluminium scrap with fraction size from more than 3 till 10 mm. In the capacity of addition it is included slag-forming component quicklime CaO in amount from more than 10 till 30% from the common mass of mixture, at that mass of received briquette is 15-2000 g. For receiving of AB-91 in the capacity of aluminium scrap briquette contains alimentary aluminium tin as the basis and no more than 10% of foil, for receiving of AB-87 in the capacity of aluminium scrap it contains alimentary aluminium tin as the basis no more than 10% of foil and no more than 10% of aluminium alloys chips, with briquette is implemented in the form of cylinder of diametre 10-15 mm and height from 15 till 200 mm.
EFFECT: increasing of cost-effectiveness of briquettes from the secondary raw materials.
SUBSTANCE: method includes two-phase solution neutralisation by calcium-bearing material. Before two-phase neutralisation by calcium-bearing material nickel-bearing solution is neutralised by nickel-bearing sludge of galvanic industry till achieving of solution pH 1.0-2.5. Received solution is subject to neutralisation by calcium-bearing material: at the first stage till pH=5.0-6.0, at the second stage - with usage in the capacity of calcium-bearing material of lime milk till pH=8.5-9.5 with receiving of rich nickel concentrate.
EFFECT: quantity increasing of nickel in resulting product.
1 tbl, 2 ex
SUBSTANCE: invention refers to hydro metallurgy of non ferrous metals and can be used at development of practices for hydro metallurgical processing of solutions containing zinc together with nickel and/or copper and/or cobalt. The method includes introducing a sulphur containing reagent into the solution and heating it at a temperature of 130-170°C. At that thiosulfate as a sulphur containing reagent is used at a consumption rate of 110-130% from stoicometric required for sedimentation of nickel, cobalt and copper; this reagent is introduced into initial solution containing nickel and zinc and at least one of metals like cobalt, copper and iron. The suggested method allows extraction out of solution of nickel, copper and cobalt in form a heading with low degree of a zinc codeposition.
EFFECT: processing without seeding agent and reduction of process time.
4 cl, 6 tbl, 6 ex
FIELD: petrochemical industry; methods of the selective extraction of molybdenum from the solutions containing molybdenum and vanadium.
SUBSTANCE: the invention is pertaining to the method of the selective extraction of molybdenum from the liquid mixtures, in which molybdenum is present with vanadium at the amount of molybdenum exceeding (200) mg/l. The method includes the following stages: bringing the liquid mixture Ph value to the value less than 3, adding to this solution of the solution of alkaline xanthate at maintaining the molar ratio of molybdenum /alkaline xanthate within the interval from 1/4 up to 1/8 at the constant value of pH by means of addition of the inorganic acid, stirring the mixture and settling the molybdenum present in the mixture. The technical result of the invention is the high product yield at separation of molybdenum and vanadium and simplification of the production process.
EFFECT: the invention ensures the high product yield at separation of molybdenum and vanadium and simplification of the production process.
5 cl, 1 tbl, 3 ex
FIELD: powder metallurgy, namely processes for producing silver powder used in electrical engineering industry branches, possibly for making electrodes of chemical electric current sources, electric contacts and so on.
SUBSTANCE: method comprises steps of depositing silver chloride from solution of silver nitrate with use of water soluble chloride at temperature 20 - 50°C and pH 1 - 5; decanting mother liquor; treating suspension with solution of alkali metal hydroxide at concentration in reaction medium 12 - 200 g/l; reducing silver from suspension by means of Formalin or formate at temperature 40 - 90 c for 10 -60 min; washing out successively in hot deionized water, in ammonium solution and in cold deionized water; filtering and drying deposit of silver powder at 70 - 120°C.; sifting dried powder through sieve with mesh 250 micrometers.
EFFECT: improved electrochemical, chemical and physical properties of silver powders.
2 cl, 1 tbl, 1 ex
SUBSTANCE: invention relates to noble metals metallurgy and can be used for reprocessing of different wastes of refining, such as dust-fumes or water-insoluble residues of dust-fumes. Method of products reprocessing, containing chalcogenides of base metals, lead, platinum metals, gold and argentum includes leaching of initial product in solution of caustic soda, separation of received alkaline solution from insoluble residue. Insoluble residue is subject to melting with addition of manufactured products of refining, sodium-bearing flux and carbonaceous reductant. After melting it is implemented grinding of separated bottom heavy phase into the powder and its treatment as a concentrate of refining. Into received during leaching initial products alkaline solution it is added sulfuric acid up to pH=4-6, it is separated laid-down from the solution deposit of hydroxides on the basis of tellurium dioxide. Solution after the sediment separation is again treated by sulfuric acid up to pH=1-2, it is added sodium sulfite and separated laid-down deposit of metal selenium, and mother solution is subject to finishing de-refining.
EFFECT: cost cutting while de-refining of received during the reprocessing solutions.