Copper electrolyte adsorption, impurity removal and purification method

Abstract

The invention discloses a copper electrolyte adsorption, impurity removal and purification method which is characterized by comprising the following steps: by taking oxides of antimony or / and bismuth and hydrates thereof as adsorbents, selectively adsorbing impurities As, Sb and Bi from copper electrolyte or from a solution in which cathode copper is produced through electrodeposition of the copper electrolyte or from a crystallizing mother solution obtained after copper sulfate is evaporated, concentrated and crystallized in the copper electrolyte. According to desorption of loaded adsorbents and regeneration of the analyzed solution, the adsorbents and analytical solution can be recycled, and the adsorbed impurities As, Sb and Bi can be recycled. The method has the advantages of simple process, simple and convenient operation, low production cost, good purification effect and the like, side effects on a main process are avoided, a traditional electrodeposition copper and impurity removal copper electrolyte purification process can be completely substituted, black copper sludge and black copper plate in the copper electrolyte purification process are completely eliminated, emission of harmful substances such as AsH3 is avoided, pollution is reduced, and the environment is protected.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy, and in particular relates to a copper electrolyte adsorption, impurity removal and purification method, which is suitable for the separation and recovery of impurities arsenic, antimony and bismuth in the copper electrolyte. Background technique [0002] During the refining process of copper electrolysis, the impurities arsenic, antimony and bismuth are electrochemically dissolved together with the anode copper into the copper electrolyte. After the impurities arsenic, antimony and bismuth enter the copper electrolyte, As(III) and Sb(III) can be gradually dissolved in the air in the electrolyte (O 2 ) is oxidized to As(V) and Sb(V), but the oxidation rate of As(III) is much faster than that of Sb(III), so under normal circumstances, 90-95% of arsenic in copper electrolyte is It exists in the form of As(V), while more than 90% of antimony exists in the form of Sb(III). The valence state of bismuth...

AI Technical Summary

Problems solved by technology

[0003] There are many defects in the traditional copper electrolyte purification process: high energy consumption, purification of 1m 3 The electrolyte consumes 100-120kwh of electricity and 0.8-1 ton of steam; the operating environment of the clean liquid is poor, producing a large amount of black copper sludge and black copper plates, and releasing harmful gas AsH 3 The direct recovery rate of copper electrolysis is low, and the black copper mud and black copper plate are returned to the fire method system to recover the copper, which causes the copper and impurities arsenic, antimony and bismuth to circulate in the smelting system.

However, these methods are only supplements to the traditional liquid purification process and cannot completely replace the traditional copper electrolyte purification process