Processing method of zinc sulfide concentrate

Abstract

The invention provides a method used for processing a zinc sulfide concentrate through a first stage pressure acid leaching process and a second stage pressure neutralizing step. The method comprises steps that: (1) oxygen and an acid with a concentration of 110-190g / L are delivered into a zinc sulfide concentrate with a preset particle size; the first stage pressure acid leaching process is carried out, wherein the leaching rate of zinc is no less than 98% and the leaching rate of iron is no more than 10%; (2) an obtained first-stage leaching solution is delivered into a second-stage pressure reactor; oxygen is delivered into the reactor; the zinc sulfide concentrate with a preset particle size is subject to a neutralization reaction, such that free acid in the solution is consumed; with the reduced acidity, iron is oxidized and removed, such that a leaching solution with an acid concentration no more than 5g / L and an iron content no more than 1g / L is obtained. The method provided by the invention is advantaged in simple technology, short technological process, high raw material adaptability, good production capacity, high metal recovery rate, low neutralizer consumption, low production cost, and long machine time. The leaching rate of zinc is no less than 98% and the leaching rate of iron is no more than 10%. 90% of iron is removed with a first-stage leaching slag. A final acid concentration of the leaching solution is no more than 5g / L, and a final iron content is no more than 1g / L.

Description

technical field [0001] The invention belongs to the field of nonferrous metallurgy, and in particular relates to an improved method for one-stage pressure acid leaching and two-stage pressure neutralization for treating zinc sulfide concentrate. Background technique [0002] In the existing process of producing zinc from zinc sulfide concentrate, the traditional two-stage oxygen pressure leaching process of one-stage low-acid leaching and second-stage high-acid leaching is usually adopted. That is, low-acid leaching is used in the first stage, the initial acid concentration is 70-80g / L, the zinc leaching rate is 50-70%, the leaching solution is sent to pre-neutralization, iron removal, purification, electrowinning, and the leaching residue enters the second stage High acid leaching. In the second stage, high-acid leaching is adopted, the initial acid concentration is about 150g / L, the leaching residue is sent to sulfur selection, and the leaching solution is returned to the...

AI Technical Summary

Problems solved by technology

[0007] Finally, the amount of slag is large, the loss of zinc is large, and the metal recovery rate is low