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Method and system for purifying antimony sulfide concentrate molten salt electrolysis smoke dust and preparing sulfur

A technology of molten salt electrolysis and dust purification, applied in chemical instruments and methods, preparation/purification of sulfur compounds, sulfur, etc., can solve problems such as difficult to realize the recovery and utilization of antimony sulfide, environmental pollution of the surrounding environment, difficult recycling and utilization, etc. Achieve the effect of simple and practical method, strong continuity and high applicability of materials

Pending Publication Date: 2022-07-05
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, in the actual production process, these substances will be collected in the form of soot mixture. If not purified, not only the elemental sulfur in the soot cannot realize its economic value in the form of product sulfur, but also the antimony sulfide, molten Valuable components such as salt are also difficult to recycle and reuse. Improper disposal or leakage will also bring environmental pollution and ecological damage to the surrounding environment.
However, according to the existing treatment technologies for sulfur-containing materials, it is difficult to efficiently recycle molten salt and antimony sulfide in such sulfur-containing soot materials, and simultaneously produce high-grade sulfur

Method used

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  • Method and system for purifying antimony sulfide concentrate molten salt electrolysis smoke dust and preparing sulfur
  • Method and system for purifying antimony sulfide concentrate molten salt electrolysis smoke dust and preparing sulfur
  • Method and system for purifying antimony sulfide concentrate molten salt electrolysis smoke dust and preparing sulfur

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Experimental program
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Effect test

Embodiment 1

[0065] The material of the conveyor belt in this embodiment is graphite, and the length of the distillation and desulfurization zone formed by heating the middle of the belt conveyor by a gas heater is 0.8 m.

[0066] The process of antimony sulfide concentrate molten salt electrolysis fume purification and sulfur production is as follows:

[0067] The chemical composition of sulfur-containing soot A obtained by molten salt electrolysis of an antimony sulfide concentrate is as follows: the mass proportion of molten salt is 10wt%, the mass proportion of antimony sulfide is 35%, and the mass proportion of elemental sulfur is 55%.

[0068] First, adjust the thickness of soot on the conveyor belt to be 2 cm, the running speed to be 0.2 cm / s, the distillation temperature to be 600°C, and the nitrogen flow rate to be 0.1 cm / s. The condensing temperature of the first condensing tower was controlled to be 540°C and the gas flow rate was 0.05cm / s, and the temperature of the second cond...

Embodiment 2

[0070] The material of the conveyor belt in this embodiment is alumina, and the length of the distillation and desulfurization zone formed by heating the middle of the belt conveyor by a gas heater is 0.8 m.

[0071] The process of antimony sulfide concentrate molten salt electrolysis fume purification and sulfur production is as follows:

[0072] The chemical composition of sulfur-containing soot B obtained by molten salt electrolysis of an antimony sulfide concentrate is: the mass proportion of molten salt is 15wt%, the mass proportion of antimony sulfide is 27%, and the mass proportion of elemental sulfur is 58%. First, adjust the thickness of soot on the conveyor belt to be 4 cm, the running speed to be 0.4 cm / s, the distillation temperature to be 580°C, and the flow rate of nitrogen gas to be 0.2 cm / s. The condensing temperature of the first condensing tower was controlled to be 500°C and the gas flow rate was 0.1 cm / s, and the temperature of the second condensing tower w...

Embodiment 3

[0074] The continuous purification and desulfurization process test of smoke and dust was carried out with the same raw materials and parameters in the above-mentioned Example 2. After the process runs for 3 hours, the intermediate temperature condensation tower product is collected, and the proportion of antimony sulfide is 98.4wt%, the proportion of molten salt is 1.2wt%, and the proportion of elemental sulfur is 0.4wt%. The product of the second condensing tower is collected, and the proportion of antimony sulfide is 0.1 wt %, the proportion of molten salt is 0.2 wt %, and the sulfur grade is 99.7 wt %. The molten salt composition at the end of the conveyor belt is: 0.2 wt% of antimony sulfide, 0.1 wt% of sulfur, and 99.7% of molten salt.

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Abstract

The invention discloses a method and a system for purifying antimony sulfide concentrate molten salt electrolysis smoke dust and preparing sulfur. The method comprises the following steps: uniformly spreading the antimony sulfide concentrate molten salt electrolysis sulfur-containing smoke dust on a belt conveyor through a feeding funnel, transporting to a distillation area, and distilling volatile antimony sulfide and elemental sulfur in the smoke dust into a gas phase by high-temperature inert gas with a certain flow rate; then distilled mixed gas sequentially passes through a first condensing tower and a second condensing tower to be subjected to two-stage condensation, and antimony sulfide and elemental sulfur are separately separated out. The antimony sulfide and the molten salt are returned to the electrolysis process again, and the liquid sulfur is prepared into a high-grade sulfur product by a pelletizer. In addition, inert gas is recycled through the gas pressurizing machine and the heater. The method disclosed by the invention is simple and practical, and good effects can be obtained on purification of the flue gas generated by electrolysis of the antimony sulfide molten salt and preparation of sulfur.

Description

technical field [0001] The invention belongs to the technical field of sulfur-containing fume and dust treatment, and in particular relates to a method and system for purifying antimony sulfide concentrate molten salt electrolytic fume dust and preparing sulfur. Background technique [0002] Antimony is a rare strategic metal, antimony sulfide concentrate (mainly composed of Sb 2 S 3 ) is its main smelting raw material, and the existing smelting process is basically pyro smelting, accounting for more than 95%. At present, metal antimony is mainly produced by the "blast furnace volatilization-reverberatory furnace reduction" process. The smelting process produces a large amount of low-concentration SO 2 The environmental pollution caused by flue gas is quite serious. With the continuous upgrading of national and local government environmental protection standards, SO 2 emission control has become more and more stringent. Facing the challenges brought by environmental po...

Claims

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Application Information

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IPC IPC(8): C01G30/00C01B17/02C01B17/027
CPCC01G30/008C01B17/021C01B17/027Y02P10/20
Inventor 杨建广朱强丁瑞泽唐朝波南天翔曾伟志
Owner CENT SOUTH UNIV
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