Comprehensive utilization method of sulfur slag generated in hyperbaric oxygen leaching of zinc concentrate

Abstract

The invention relates to a comprehensive utilization method of sulfur slag generated in hyperbaric oxygen leaching of zinc concentrate, belonging to the field of comprehensive utilization of industrial residues in metallurgical industry. The method disclosed by the invention comprises the following steps: adding sulfur slag to a leaching tank containing water and carbon disulfide, wherein the water plays a sealing role, and prevents carbon disulfide from volatilizing in the leaching process; obtaining a high-quality sulfur product by vacuum filtration and distillation after reaction under stirring; obtaining enrichment slag of gathering zinc-mercury from filter residues after washing and drying. The sulfur content of the sulfur product obtained by adopting the method is more than 99.5%, Hg content is smaller than 0.02mg / kg, the Zn content in the enrichment slag can be up to about 25%, Ag content is more than 1600g / t, and the Hg content is about 0.5%. By adopting the technique, industrial waste sulfur slag can be fully utilized, a new application way is developed for utilization of the sulfur slag, waste materials are changed into treasures, meanwhile, the environmental protection pressure of a smelting plant can be relieved, the environmental pollution can be reduced, and the economic benefits of enterprises are improved.

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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