Comprehensive utilization method of sulfide ore tailings

By employing a two-stage acid leaching-gravity separation-flotation process, the problem of separating barite and pyrite in fine-grained, high-viscosity lead-zinc tailings has been solved, achieving efficient recovery and resource recycling while reducing environmental pressure.

CN122076598APending Publication Date: 2026-05-26NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Patent Information

Application Number
CN202610240584.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-02-28
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing technologies are insufficient to effectively separate barite and pyrite from fine-grained, high-viscosity lead-zinc tailings, resulting in low recovery rates. Furthermore, traditional processes fail to completely remove calcite interference, affecting the sorting effect.

Method used

A two-stage acid leaching-gravity separation-flotation combined process is adopted. First, calcite is removed by two stages of acid leaching, then undissolved silica gangue minerals are separated by gravity separation, and finally flotation is performed to achieve complete separation of barite and pyrite.

Benefits of technology

It achieves the simultaneous recovery of high-purity barite and pyrite, reduces tailings storage pressure, improves resource utilization, reduces environmental pollution risks, and the process is simple and easy to promote industrially.

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Abstract

The invention discloses a comprehensive utilization method of sulphide ore tailings, and relates to the technical field of sulphide ore tailings treatment. According to the method, the lead-zinc tailings are used as raw materials, a combined process of two-stage acid leaching, reselection and flotation is innovatively adopted, firstly, calcite associated with barite in the tailings is selectively leached through two-stage acid leaching, and pyrite is activated while the influence of argillization calcite is reduced; and then the acid leaching residues are subjected to reselection treatment, and undissolved calcite, quartz and other silicon-containing gangue minerals are further separated. And then the gravity concentrate is subjected to flotation treatment, flotation separation of barite and pyrite is achieved, and finally a high-purity barite product and a high-purity pyrite product are obtained. The process route is reasonable, operation is easy and convenient, the separation problem of the fine-grain high-viscosity lead-zinc tailings can be effectively solved, all-component purification and utilization of the lead-zinc tailings are achieved, the economic value of tailings resources is remarkably improved, meanwhile, the environmental pressure caused by tailings stockpiling is reduced, and good economic benefits, environmental benefits and social benefits are achieved.
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