Process for recovering inhibited pyrite and pyrrhotite by utilizing two-step method

Abstract

The invention discloses a process for recovering inhibited pyrite and pyrrhotite by utilizing a two-step method. The process comprises the following steps of: (1) adding acid, so that a pH (Potential of Hydrogen) value is less than 10; (2) adding copper sulfate; (3) adding sodium n-butylxanthate; (4) adding a foaming agent; (5) obtaining high-sulfur concentrate through flotation; (6) adding the acid into ore pulp after the floatation to enable the pH value to be 6-7; (7) adding the copper sulfate; (8) adding the sodium n-butylxanthate; (9) adding the foaming agent; and (10) obtaining low-sulfur concentrate through the floatation. By utilizing the process provided by the invention, the recovery rate of sulfur and iron can be greatly improved; the comprehensive use ratio of ore resources can be improved; and the problems of environment pollution and land occupation brought by a large amount of stacked cinders can be reduced. The process provided by the invention has great significance in improving a mine and social and economical benefits.

Description

technical field [0001] The invention relates to a process for producing sulfur concentrate by flotation of suppressed pyrite and pyrrhotite. Background technique [0002] Ore is generally composed of useful minerals and gangue. The content of useful minerals in ore is generally low and cannot be smelted directly. It needs to be processed first to remove most of the gangue and harmful components, so that the content of useful minerals is high. concentrates. Mineral processing technology is to make full use of the differences in physical and chemical properties of various minerals to achieve the purpose of mineral separation and enrichment. Commonly used mineral processing technologies include gravity separation, magnetic separation, flotation and so on. Sulfur concentrate is the main raw material for the production of sulfuric acid, which is mainly produced by enriching sulfur-containing minerals in the ore. The mineral that usually produces sulfur concentrate is pyrite (m...

AI Technical Summary

Problems solved by technology

Although the two minerals are both raw materials for acid production, due to differences in sulfur and iron content and roasting temperature, there are differences in the ingredients and roasting temperature requirements for acid production; The utilization value of sulfuric acid slag is different. The slag with higher iron content can be used as raw material for ironmaking and iron pellets, while the slag with lower iron content is difficult to use, and the storage will cause greater environmental pollution.

For example, in the production process of Tongling Nonferrous Dongguashan Copper Mine in Anhui Province, the sulfur content and recovery rate of sulfur concentrate often fluctuate greatly. When the sulfur content of sulfur concentrate is greater than 40%, the sulfur recovery rate is low; When the sulfur content of the ore is less than 35%, the sulfur recovery rate is high; it seriously affects the stability of production, brings difficulty to product sales, and affects the economic benefits of the mine

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