A comprehensive utilization method of zinc concentrate high pressure oxygen leaching sulfur residue

Abstract

The invention relates to a comprehensive utilization method of zinc concentrate high-pressure oxygen leaching sulfur residue, which belongs to the field of comprehensive utilization of industrial waste residue in the metallurgical industry. The method of the present invention is to add the sulfur residue into the leaching tank containing water and carbon disulfide, the water acts as a seal to prevent the volatilization of carbon disulfide during the leaching process, and after stirring and reacting, vacuum filtration and distillation are performed to obtain high-quality sulfur products, and the filter residue is washed, After drying, the enriched slag enriched with zinc and mercury is obtained; the sulfur product obtained by the above method contains more than 99.5% sulfur, Hg is less than 0.02mg / kg, the Zn content in the enriched slag reaches about 25%, Ag1600g / t is above, Hg0. About 5%; this technology can not only make full use of industrial waste sulfur slag, develop a new application way for the utilization of sulfur slag, turn waste into treasure, but also reduce the environmental protection pressure of smelters, reduce environmental pollution, and improve economic benefits of enterprises .

Description

technical field [0001] The invention belongs to the research field of solid waste utilization in the metallurgical industry, and specifically relates to a method for comprehensive utilization of sulfur-containing slag produced in the high-pressure oxygen leaching process of zinc concentrate. Background technique [0002] Zinc concentrate is leached by high-pressure oxygen leaching process. In the autoclave, zinc concentrate reacts with oxygen, electrolytic waste acid, etc., and a certain temperature and pressure are controlled. Zinc concentrate can be directly leached into ZnSO4 solution and produce elemental sulfur. Elemental sulfur and The other insoluble impurities brought by the concentrate raw materials are mixed and separated to obtain oxygen pressure leaching slag. The main components of the slag are 60-80% sulfur, Zn6-10%, Fe2-7%, Pb1-6%, Ag400- 800g / t, Hg0.15~0.2%, etc., so the main component of oxygen pressure leaching residue is sulfur, most of which is elemental ...

AI Technical Summary

Problems solved by technology

If the sulfur slag containing unstable element sulfur and heavy metal elements accumulates in large quantities, it will cause serious pollution to the ecological environment and waste sulfur resources and valuable metal elements with high value.

[0003] At present, there are mainly the following methods for the treatment of zinc concentrate high pressure oxygen leaching slag: it is used as raw material for pyrite acid plant, and sulfuric acid is produced after batching, but it is restricted by factors such as transportation and price; the slag is flotation Separating and obtaining sulfur concentrate, and then performing sulfur melting, hot filtration, packaging and granulation on the sulfur concentrate to extract sulfur products, this method is difficult to implement, and the quality of the obtained sulfur products is difficult to guarantee; the sulfur is volatilized by vacuum distillation Finally, the sulfur product is recovered, but when the sulfur is recovered by this method, the mercury will volatilize with the sulfur and enter the sulfur product, which will affect the quality of the sulfur product.

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