Synergistic leaching-copper arsenate removing method for leaching residues in high-iron zinc calcine and high-iron zinc sulfide concentrate

Abstract

The invention belongs to the field of wet metallurgy of zinc, and particularly relates to a synergistic leaching-copper arsenate removing method for leaching residues in high-iron zinc calcine and high-iron zinc sulfide concentrate. The method comprises the following steps: mixing the leaching residues in the high-iron zinc calcine with the high-iron zinc sulfide concentrate; mixing zinc electrowinning waste liquor and a part of sulfuric acid-containing solution prepared from concentrated sulfuric acid and synergistically leaching; adding a reaction dosage of industrial iron powder into a synergistically-leached copper arsenate-removing primary solution; replenishing a proper amount of copper sulfate as required; reacting; performing liquid-solid separation on reaction ore pulp to obtain cuprous arsenide precipitate serving as a copper-leaching raw material and a copper arsenate-removing secondary solution; returning the copper arsenate-removing secondary solution to a zinc hydrometallurgy process to further recover valuable metals therein. The method is clean and efficient, efficient leaching of copper and efficient reduction of Fe<3+> can be realized, the solution treatment amount is small, the comprehensive recovery rate of valuable metals in a zinc hydrometallurgy process is increased comprehensively, and the smelting flow is simplified.

Description

technical field

[0001] The invention belongs to the field of zinc hydrometallurgy, in particular to a method for synergistic leaching-copper and arsenic removal of leaching slag in high-iron zinc calcine and high-iron zinc sulfide concentrate. Background technique

[0002] In the existing hydrometallurgical technology, the enrichment methods of copper in copper-containing acidic solution are mainly solvent extraction method and metal replacement method. Solvent extraction is mainly used in the enrichment process of copper in the solution with high copper ion concentration produced in the wet copper smelting process. In the zinc hydrometallurgy process, due to the low copper content of the zinc concentrate, the copper concentration in the leaching solution is also low. At this time, when the solvent extraction method is used in the production process, the solution processing volume is large, and the process is difficult to control, while zinc powder, iron powder or Metal pow...