A method for separating zinc and iron in a zinc hydrometallurgy process

Abstract

The invention relates to a zinc and iron separation method in the zinc hydrometallurgy process and belongs to the technical field of hydrometallurgy. Firstly, zinc concentrate is subjected to low-temperature roasting to obtain zinc calcine; then the zinc calcine, zinc hydrometallurgy electrolysis post-liquid and produced weak acid fluid are subjected to neutral leaching, and neutral leachate containing 20 mg / L or less of iron and neutral leached residues are produced; the obtained neutral leached residues and indium and copper extraction post-liquid are mixed to be subjected to weak-acid leaching, and weak acid fluid containing 1 g / L or less of iron and weak acid residues are produced; the obtained weak acid residues are subjected to the silver flotation process, and silver concentrate and zinc and iron slag are produced; the obtained zinc and iron slag and zinc hydrometallurgy electrolysis post-liquid are subjected to high-temperature high-pressure leaching, and high-iron slag and high-pressure leachate containing 10 g / L or less of iron are produced; and the obtained high-pressure leachate is subjected to separation for recovery of copper and indium, and indium and copper extraction post-liquid is obtained in the process. According to the zinc and iron separation method, the leaching technology combining traditional hydrometallurgy leaching with pressure leaching is adopted, the leaching process is enhanced, and the slag treatment and deironing process is simplified, so that the zinc leaching rate is high, and the deironing efficiency is high.

Description

technical field [0001] The invention relates to a method for separating zinc and iron in a zinc hydrometallurgy process, belonging to the technical field of hydrometallurgy. Background technique [0002] During the ore-forming process of sphalerite, iron and indium replace zinc atoms in sphalerite with isomorphism, and it is difficult to separate zinc, iron, and indium by mechanical grinding and beneficiation methods, resulting in the zinc produced by beneficiation Concentrates contain high iron, and are associated with relatively high content of indium, copper and other metals. This high-iron zinc concentrate usually has a lower zinc grade, high indium and copper content, and low associated lead content. [0003] During the smelting process, due to the mosaic coexistence of iron and zinc in the zinc concentrate, a large amount of zinc ferrite is inevitably produced under roasting conditions. In the conventional leaching process, zinc ferrite is not destroyed in the neutra...

AI Technical Summary

Problems solved by technology

This method adopts the combined leaching process of traditional wet leaching and pressure leaching, strengthens the leaching process, simplifies the slag treatment and iron removal process, has high zinc leaching rate and high iron removal efficiency, and solves the iron removal problem that has existed for a long time in the wet zinc smelting process. In the process, the recovery rate of valuable metals is low, the environmental pollution of slag piles and other problems are solved by the present invention through the following technical solutions