Technology for recycling sulfur and valuable metal from copper oxidative pressure leaching residues

Abstract

The invention discloses a technology for recycling sulfur and valuable metal from copper oxidative pressure leaching residues and belongs to the technical field of non-ferrous metal recycling. According to the technology for recycling the sulfur and the valuable metal from the copper oxidative pressure leaching residues, through carrier flotation, selective mixed flotation of sulfur, iron, copperand metal in the copper oxidative pressure leaching residues is achieved, the problem that precious metal in the copper oxidative pressure leaching residues cannot be recycled is effectively solved, and the problem of influence of the iron element in the copper oxidative pressure leaching residues on the flotation recovery rate is also solved; addition of flocculant is mainly used for increasing the particle size of sulfur and reducing the ore pulp viscosity caused by iron colloid in the copper oxidative pressure leaching residues, and it is achieved that the sulfur in the leaching residues isused as the flotation carrier of the copper, the iron, the gold and the like. Segmented pressure filtration achieves segmented backwater utilization, it is avoided that agents intervene in the copperoxidative pressure leaching process and the residue processing full procedure, and the utilization rate of recycling treatment and the stability of the procedure are improved. After flotation recycling of copper concentrate, cyaniding gold extracting is conducted, the interference of the copper ions is lowered, effective enrichment of gold is achieved, and effective economic benefits are createdfor cyaniding gold extracting.

Description

technical field [0001] The invention belongs to the technical field of non-ferrous metal recovery, in particular to a process for recovering sulfur and valuable metals from copper oxygen pressure leaching slag. Background technique [0002] There are at least 160 kinds of copper-containing minerals in nature. The copper minerals in my country are mainly sulfide ores. Among the proven reserves, sulfide ores account for 87%, oxide ores account for 10%, and mixed ores account for 3%. At present, for copper sulfide concentrate, the pyroprocessing process is relatively mature, and the smelting-refining-ingot process is used to produce large quantities of high-quality refined copper products. However, the pyrotechnic process has many disadvantages, such as: in order to reduce production costs, the construction scale must be large; dust pollution is serious; low-grade tailings and waste ores cannot be processed. In contrast, the hydrometallurgy process has more advantages. [000...

AI Technical Summary

Problems solved by technology

Although copper oxygen pressure acid leaching technology solves the production problems of sulfur dioxide pollution and low copper leaching rate in the process of copper sulfide concentrate treatment, the leaching slag contains a large amount of elements such as S, Fe and unleached Au, etc., and the Cu content is about 5 %, Fe content about 30%, sulfur 20-40%, Au content about 80-200g / t

At present, a large amount of oxygen pressure leaching slag is directly piled up, and the natural oxidation of elemental sulfur causes serious pollution to the environment, and wastes an available secondary resource. Copper, iron, and gold in the leaching slag are all valuable for recycling, and comprehensive recycling is meaningful major

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