Technique for recycling ammonium sulfate to extract copper from copper sulphide minerals through wet process

Abstract

The invention belongs to the field of wet process copper extraction, and particularly relates to a technique for recycling ammonium sulfate to extract copper from copper sulphide minerals through a wet process. The technique particularly comprises the following steps that the copper sulphide minerals and the ammonium sulfate are mixed and subjected to sulfating roasting; water or a sulfuric acid solution is added into roasted ore to be subjected to copper leaching treatment; metal copper is extracted from an immersion solution through an extraction and electrodeposition process, the generated waste acid pickle part returns to the leaching copper, surplus waste acid pickle is neutralized by ammonia gas decomposed by roasting to obtain ammonium sulfate, and the ammonium sulfate is crystallized out through a solvent-out crystallization method to be recycled. The sulfating roasting temperature is 400-500 DEG C, the copper minerals are mainly converted into freely soluble CuSO4 or CuO.CuSO4 by controlling the roasting temperature, iron minerals are mainly converted into difficultly soluble FeS, sulphur is left in the roasted ore mainly in a simple substance mode, SO2 gas is not generated, the environment is not polluted, and subsequent selective copper leaching is facilitated.

Description

technical field [0001] The invention belongs to the field of wet extraction of copper, in particular to a process for recycling ammonium sulfate for sulfation roasting, and then wet extraction of copper from copper sulfide ore. Background technique [0002] Copper sulfide ore is one of the most important copper ore resources in the world. Although the extraction of copper from copper sulfide ore is still dominated by pyrometallurgy, the pyrometallurgical process has higher requirements on the grade of copper ore, and there are high energy consumption, complicated process and SO 2 Gas and toxic metal compounds such as arsenic pollute the environment. As the grade of copper sulfide ore resources becomes lower and lower, it becomes more and more difficult to select, and the requirements for environmental protection continue to increase, coupled with the large fluctuations in copper prices in recent years, the disadvantages and shortcomings of the pyrometallurgical copper smelt...

AI Technical Summary

Problems solved by technology

Although the treatment with lime neutralization method is simple and easy, it makes the acid solution unable to be recycled, which not only increases the production cost, but also has the problem that a large amount of copper-containing gypsum is difficult to handle and easily causes secondary pollution.

Because of this, although the sulfuration roasting-leaching-extraction-electrowinning copper extraction process was popular for a while, like other wet copper extraction processes, it is ultimately difficult to apply it on a large scale in production

Images