Production device and method for recovering sulfur from sulfur slag

Abstract

The invention discloses a production device and method for recovering sulfur from sulfur slag. The device comprises a material preparation unit, a conveying unit, a pretreatment unit, a melting unit and a thermal filtration unit. The material preparation unit comprises a crusher, a vibrating screen and a raw material bin. The conveying unit comprises a feeder and a conveyor belt. The pretreatment unit comprises a mixing device and/or a kneading device. The melting unit comprises a sulfur slag stirring and melting tank. The thermal filtration unit comprises a submerged pump and a filtration device. The method includes the steps of (1) material preparation, wherein the sulfur slag is crushed, screened and stored in the raw material bin; (2) pretreatment, wherein the sulfur slag conveyed by the conveying unit is pretreated; (3) melting, wherein the sulfur slag is stirred and molten in the sulfur slag stirring and melting tank; (4) thermal filtration, wherein the molten sulfur slag is filtered, and molten sulfur and filter residues are obtained. By means of the production device and method, direct dipping and flotation sulfur slag structure transformation and device model selection are achieved, and the elemental sulfur content in the obtained molten sulfur is lager than or equal to 99.52%. The production device is easy to operate, high in flexibility and suitable for industrial production.

Description

technical field [0001] The invention relates to a production equipment and method for recovering sulfur from sulfur slag, in particular to a production equipment and method for recovering sulfur from sulfur slag by adopting a thermal filtration method. Background technique [0002] The main raw material for domestic zinc production is zinc sulfide concentrate, and its treatment method is mainly wet treatment process. The conventional zinc concentrate wet treatment process is as follows: first, zinc sulfide concentrate is roasted at high temperature to form zinc oxide, then zinc is leached with sulfuric acid, and then zinc metal is produced by electrowinning. In the process of high-temperature roasting of zinc sulfide concentrate into zinc oxide, the sulfur in the zinc concentrate turns into sulfur dioxide, and domestic manufacturers usually turn sulfur dioxide into sulfuric acid. Since the large-scale use of sulfuric acid has seasonal and regional restrictions, the zinc con...

AI Technical Summary

Problems solved by technology

This pretreatment method is the same as the high-pressure oxygen leaching method for zinc concentrate zinc smelting process and equipment, which is equivalent to treating the leach slag obtained by the direct leaching method with high pressure oxygen leaching, and then recovering the leach slag by hot filtration Although the sulfur in the process equipment is mature and has industrial examples, it also belongs to the pretreatment-thermal filtration method, but because the process becomes very complicated, it is equivalent to the need to use the high pressure oxygen leaching process and equipment to rebuild the factory, and the cost is relatively high. unacceptable

[0014] In summary, due to the selectivity of raw materials in the existing thermal filtration equipment and processes, the thermal filtration method, which is superior in terms of technology and economic benefits, cannot be used for universal industrial production. Therefore, it is necessary to improve the existing thermal filtration The method is further improved to be suitable for the extraction of sulfur from different sulfur-containing raw materials

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