Extraction method of palladium, silver and copper of waste electrolytes

FIELD: metallurgy.

SUBSTANCE: invention relates to extraction method and utilisation of palladium, silver and copper of waste electrolytes, containing thiourea, sulfuric acid, water and sludge. Method includes addition to waste electrolyte 33.0-67.5% hydrogen peroxide and blending with transfer of palladium and silver into sediment. After appearance of green colouring in its solution is cooled and filtered. Sediment is anneal and received alloy from palladium and silver.

EFFECT: receiving of ability of quantitative isolation from electrolyte of palladium and silver in the form of metals, which are in the sequel can be used in industrial aims.

1 ex

 

The technical field

The invention relates to the chemical industry, and in particular to technology for the utilization of palladium, silver and copper from waste electrolytes.

The level of technology

In order to improve the quality of products made of precious metals containing palladium, 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 palladium, 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 complexes 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.):

2T2MeHSO4+Zn=me+Zn(HSO4)2+4T,

where T - thiourea (NH2)2CS.

This method is used for the prototype.

The disadvantages of the method of the prototype is not effective utilization of palladium and silver from the electrolyte.

Disclosure of inventions

Object of the invention is the development of the processing of the method of extraction of palladium, 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) palladium 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 extraction of palladium, silver and copper from spent electrolyte containing thiourea, sulfuric acid, water and sludge, including the destruction of a complex of palladium, silver and copper, characterized in that for the destruction of the complexes of palladium, silver and copper in the spent electrolyte add 33,0-67,5%hydrogen peroxide when mixed with translation of palladium and silver in the residue, and copper in the solution after the appearance of the green color of the solution, it is cooled, filtered, the precipitate is heated to obtain an alloy of palladium and silver.

In the proposed method, instead of the zinc powder is injected 33,0-67,5%hydrogen peroxide, which destroys complexes of palladium, silver and copper with thiourea. In this case there are in the free state palladium and silver, copper goes into solution, and thiourea decomposes with evolution of sulfur dioxide and ammonium sulfate.

The end of the reaction is recorded on the emergence of green is the first color of the solution.

The implementation of the invention

The following example confirms the feasibility of the invention.

Example.

The alloy with the palladium content of 47.5%, silver 22,0%, copper of 30.5% 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 palladium, silver and copper with thiourea there is a strong warming by emitting carbon dioxide.

T2PdHSO4+H2O2=Pd+2T+H2SO4+H2O

T2AgHSO4+H2O2=Ag+2T+H2SO4+H2O

2T+2H2O2+2H2SO4=2S+2CO2+2(NH4)2SO4

2T2CuHSO4+H2O2=2CuSO4+4T+2H2O

The appearance of green color of the solution indicates the end of the reaction. After cooling, palladium, 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 palladium and silver to form an alloy (2.85 g), which is used for industrial purposes.

The proposed method can be widely used for recycling precious metal is low in the manufacture of products, jewelry containing palladium and silver.

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 extraction of palladium, silver and copper from spent electrolyte containing thiourea, sulfuric acid, water and sludge, including the destruction of complexes of palladium, silver and copper, characterized in that for the destruction of the complexes of palladium, silver and copper in the spent electrolyte add 33,0-67,5%hydrogen peroxide when mixed with translation of palladium 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 palladium and silver.



 

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