PROCESSING OF INDUSTRIAL PRODUCTS WHEN DISPOSING OF COPPER ELECTRO-REFINING SOLUTIONS

Abstract

at enterprises that process secondary copper raw materials, it is customary to extract copper from the spent electrolyte by electroextraction. After electroextraction, the solution is neutralized with lime milk to obtain a gypsum nickel-containing cake or evaporated with the release of a cake containing metal sulfates (Cu, Ni, Zn, Fe), which is sold as a commercial product. The search for effective technological solutions for the selective isolation of secondary non-ferrous metals during the regeneration and complete utilization of copper electro fining solutions is relevant. The paper presents studies of the processing of spent copper electrolyte from the processing of non-ferrous metal scrap at a copper smelter in Kazakhstan. For the processing of the spent electrolyte, a stage-by-stage neutralization was performed using zinc sublimates and potash. As a result of the first stage of neutralization with zinc sublimations to pH 4.7, a precipitate with a content of PbO 44.69 %; SnО2 16,36 %.was obtained. After processing the sediment with an alkaline solution, carbonization and melting at a temperature of 900oC, metallic lead and tin-containing slag with a content of SnО2 of 16.36 % were obtained. As a result of the second stage of neutralization with potash to pH 7.1, a precipitate was obtained-with a CuO content of 76.45 %.After the third stage of neutralization with potash to pH 9.5, a precipitate with a content of NiO 27.63 % and ZnO 55.75 % was obtained. After treatment of the precipitate with a solution containing 100 g / dm3 KOH, a zinc-containing solution with a ZnO content of 225.0 g/dm3 and a precipitate were obtained, after calcination of which nickel oxide with a NiO content of 89.14 % was obtained.