A method for preparing sulfur concentrate powder using high-silica cyanide tailings

By treating high-silica cyanide tailings with a composite cyanide removal agent and flotation process, the problems of high energy consumption, pollution and high cost in existing technologies have been solved, achieving efficient cyanide removal and resource utilization, and producing sulfur concentrate that can be used in sulfuric acid plants and high-quality building material raw materials.

CN121649223BActive Publication Date: 2026-05-26SHANDONG HONGCHENG MINING CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHANDONG HONGCHENG MINING CO LTD
Filing Date
2026-02-07
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing methods for treating high-silica cyanide tailings are energy-intensive, cause secondary pollution, have complex processes or incomplete cyanide removal, and have high operating costs, making it difficult to achieve complete resource utilization.

Method used

A composite cyanide removal agent is used to convert high-silica cyanide tailings into HCN under stirring and aeration conditions. NaCN is then formed through alkali absorption, followed by the addition of iron salts to form stable ferric cyanide compounds. Flotation is then carried out, and collectors and frothers are added to improve the recovery rate of sulfur concentrate.

Benefits of technology

It achieves efficient cyanide removal, reduces the cyanide content in tailings to general solid waste, improves the recovery rate and economic value of sulfur concentrate, and allows tailings to be used as high-quality building material raw materials, realizing the resource utilization of waste.

✦ Generated by Eureka AI based on patent content.

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Abstract

This invention relates to a method for preparing sulfur concentrate powder using high-silica cyanide tailings, belonging to the field of gold cyanide tailings treatment, and includes the following steps: (1) adding water to the high-silica cyanide tailings to make a slurry, quickly adjusting the pH of the slurry to 1-2, and then adding a composite cyanide removal agent under stirring and dispersion aeration conditions; (2) acidifying the aerated slurry, adding an adjuster to adjust the pH of the slurry back to 7-8; (3) adding a collector and a frother to the pretreated material and performing flotation; (4) the pyrite-containing slurry particles float with the bubbles, are scraped off by a scraper, and after being carefully selected, sulfur concentrate slurry is obtained, and after pressure filtration and drying, sulfur concentrate is obtained; (5) the slurry after scavenging flows into the tailings slurry tank, and after pressure filtration and drying, tailings are obtained. The method of this invention has a good cyanide removal effect, and the cyanide content in the treated tailings and sulfur concentrate is less than 0.5 mg / kg, reducing the hazardous characteristics of tailings to general solid waste, and realizing the complete resource utilization of waste.
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