System for recovering sulfur from sulfur-containing leaching residues

Abstract

The invention provides a system for recovering sulfur from a sulfur-containing leaching residue. The system comprises a heating treatment device and a first cooling separation device, wherein the heating treatment device is used for being placed in a nitrogenous atmosphere under the negative-pressure condition and heating the sulfur-containing leaching residue up to 400 DEG C to 500 DEG C to obtain a compound containing sulfur steam and the remaining solid slag; the first cooling separation device is connected with the heating treatment device and is used for performing the first cooling and separation on the compound containing sulfur steam to obtain molten sulfur and the remaining gas mixture. With the adoption of the system provided by the invention, sulfur in the sulfur-containing leaching residue can be rapidly and effectively separated and recycled through the direct sublimation method, the sulfur recovery efficiency is high, the contamination to the environment is reduced, the operating load and the maintenance rate of equipment are low, the content of elemental sulfur in the leaching residue is not requested, the range of application is wide, and the realization of industrialization is facilitated.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a system for recovering sulfur from sulfur-containing leaching slag. Background technique [0002] In the oxygen pressure leaching zinc concentrate process, the elemental sulfur in the zinc concentrate enters the leaching slag in solid form, and the elemental sulfur content can be as high as about 80%. The recovery of elemental sulfur in leaching slag can not only create economic benefits, but also reduce environmental pollution and achieve sustainable development. The research and experiment on the process of recovering sulfur from leaching slag at home and abroad started together with the high-pressure leaching process of zinc sulfide concentrate. Comyn Cottrell Zinc Plant in Canada first industrialized the process of recovering sulfur from leaching slag in 1981, using the hot filtration method. The thermal filtration sulfur recovery system of the zinc plant of Hudson Bay Min...

AI Technical Summary

Problems solved by technology

However, this method has the following disadvantages: (1) high equipment maintenance rate: because the leaching slag contains more impurities (about 20%), the liquid sulfur filter has a large operating load and frequent failures; (2) the sulfur recovery rate is low: the liquid sulfur filter The sulfur filter residue contains about 50% sulfur, which affects the recovery rate of sulfur. The more impurities in the leaching residue, the lower the recovery rate of sulfur; (3) Poor operating environment: melting sulfur process and liquid sulfur filter When unloading slag, a large amount of sulfur steam overflows, the operating conditions are harsh, the worker’s operating load is heavy, and the environmental pollution is also relatively serious; (4) The scope of application is narrow: this method requires that the elemental sulfur content in the leached slag is above 70%, otherwise the leached slag cannot It forms a molten state and cannot carry out subsequent liquid sulfur filtration. The scope of application is narrow and the requirements for smelting process and operation are relatively high.

[0004] Therefore, the process of recovering sulfur from sulfur-containing leaching residues still needs to be improved

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