A method for removing bismuth from copper electrolyte

Abstract

The invention discloses a method for removing bismuth from a copper electrolyte. The method comprises the specific steps that active bismuth remover is obtained by stirring and mixing antimony-containing compounds or antimony residues with a hydrogen peroxide solution for activating treatment operation, then the active bismuth remover is stirred and mixed with a bismuth-containing copper electrolyte for purification and bismuth removal operations, bismuth is selectively removed from the copper electrolyte, and purified liquid and antimony bismuth residues are obtained; the antimony bismuth residues and an acid chloride solution are stirred and mixed to be subjected to chloride bismuth removal operation, the bismuth in the antimony bismuth residue is selectively leached, and a bismuth-containing acid chloride solution and antimony residues are obtained after solid-liquid separation; and the bismuth-containing acid chloride solution is subjected to neutralization and bismuth sinking to return to the chloride bismuth removal process. The method for removing the bismuth from the copper electrolyte can enable the removal rate of bismuth in the copper electrolyte to reach up to more than95%, copper and nickel of the copper electrolyte after bismuth removal have almost no loss, and the residue of antimony has not increased significantly. Bismuth is enriched in the form of bismuth oxychloride and discharged from an electrolysis system, and the antimony residues still have a better bismuth removal effect after being subjected to hydrogen oxide activation treatment in the process ofrecycling.

Description

technical field [0001] The invention relates to a method for purifying and removing impurities from a solution, in particular to a method for removing bismuth from a copper electrolyte. Background technique [0002] Bismuth is a common associated element of copper minerals. Because the potential of bismuth is similar to that of copper, it is easy to discharge and precipitate simultaneously with copper at the cathode, and it is also easy to form floating anode slime with arsenic and antimony to adhere to the cathode, making it the most harmful impurity element to the quality of copper. At present, although there are researches on bismuth removal technologies such as solvent extraction, ion exchange, and self-purification, copper smelting companies still widely use electrowinning to co-precipitate arsenic, antimony, bismuth and copper in the form of black copper. Although the electrowinning method can open arsenic, antimony, and bismuth out of the electrolytic system, black c...

AI Technical Summary

Problems solved by technology

When the bismuth content in the electrolyte reaches 0.6 g / L, and the copper concentration in the electrowinning process is lower than 9 g / L, the bismuth discharge is obviously precipitated, so that the quality of the electrolytic copper obtained in the later stage is not up to standard.

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