A combination process for recovering pyrite from lead-zinc tailings

Abstract

The invention relates to a mineral separation combination process for recycling pyrite from lead-zinc tailings. The mineral separation combination process comprises step 1, performing mud and sand separation on the lead-zinc tailings through a spiral chute; step 2, performing sulfur flotation on mud and sand which are separated out through the spiral chute; step 3, performing magnetic separation iron extraction on the sand which is separated out through the spiral chute through the tailings after the sulfur flotation, performing flotation desulfurization on rough concentrate obtained through magnetic separation and achieving the recycling of the pyrite in the lead-zinc tailings. The sulfur grade in obtained mixed sulfur concentrate is larger than 31%; the iron grade in iron concentrate is larger than 64% and the sulfur content is smaller than 0.5%; the sulfur recovery rate in the lead-zinc tailings is as high as 95% and the iron recovery rate in the lead-zinc tailings is as high as 88%. According to the mineral separation combination process for recycling the pyrite from the lead-zinc tailings, the operation is stable, the mineral separation index is high, the comprehensive utilization of resources can be achieved, the pollution to the environment can be reduced, and the good economic benefit can be brought to enterprises.

Description

technical field [0001] The invention relates to the technical field of non-ferrous metal mineral processing engineering, specifically for associated pyrrhotite, pyrite, and magnetite, which have a high pH of the pulp, uneven output particle size, large mud content, many clay minerals, and residual Lead-zinc tailings with high chemical characteristics, a combined gravity-magnetism-flotation process for recovering sulfur and iron from the tailings is proposed. Background technique [0002] Lead-zinc sulfide ores in my country are often associated with pyrite, pyrrhotite, magnetite, and hematite. Since the floatability of lead-zinc sulfide ore is similar to that of pyrite and pyrrhotite, and the value of lead-zinc is much higher than that of pyrite, mixed flotation or preferential flotation of lead-zinc is generally used to suppress pyrite Most of the pyrite minerals are suppressed from entering the tailings. In the process of flotation of lead and zinc, the pH of the pulp is...

AI Technical Summary

Problems solved by technology

If sulfur is stored in the tailings pond for a long time, it will oxidize to form acidic water, which will cause environmental pollution when it is discharged.

According to incomplete statistics, tens of millions of tons of lead-zinc tailings are discharged in my country every year. However, due to the failure of comprehensive recovery of pyrite minerals, it not only causes waste of resources, but also poses a great threat to the environment.

[0003] At present, for the recovery of sulfur and iron in lead-zinc tailings with this characteristic, the traditional methods use spiral chute-based gravity separation method or direct flotation method to recover sulfur, and magnetic separation to recover iron. However, in production practice, it is found that no matter Which single recovery method is used, the recovery rate of sulfur concentrate is low, and qualified iron concentrate cannot be obtained, and the production index of ore dressing is unstable

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