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Method for recycling and purifying elemental sulfur from flue gas biological desulphurization sludge

A technology of biological desulfurization and elemental sulfur, applied in chemical instruments and methods, sulfur compounds, inorganic chemistry, etc., can solve the problems of no good method for biological desulfurization sludge treatment, no recovery and purification of elemental sulfur, etc. The effect of resource utilization, convenient production and reasonable price

Inactive Publication Date: 2009-07-15
TSINGHUA UNIV
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Problems solved by technology

However, since the engineering application of flue gas biological desulfurization is a relatively new topic in China, there is no good method for the treatment of biological desulfurization sludge, and there is no suitable recovery and purification of elemental sulfur from flue gas biological desulfurization sludge. method report

Method used

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  • Method for recycling and purifying elemental sulfur from flue gas biological desulphurization sludge

Examples

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Effect test

Embodiment 1

[0045] Such as figure 1 As shown, the mud cake with a water content of 60.3% was mixed with tetrachlorethylene at a mass ratio of 1:12, the mixture was heated to 80°C, and fully stirred for 10 minutes for extraction, and then the mixture was left to stand for 10 minutes to make the sulfur The perchlorethylene and the sludge-containing aqueous phase are separated. In this example, a heated centrifuge is used to centrifuge the sulfur-containing tetrachlorethylene solution at 80° C. to separate the sulfur-containing tetrachlorethylene solution and a small amount of solid sludge impurities contained therein. The water phase and sludge impurities are recovered by rapid flash evaporation to recover tetrachlorethylene.

[0046]The tetrachlorethylene solution from which impurities have been removed is cooled to 25°C. Since the solubility of elemental sulfur in tetrachlorethylene decreases significantly with the decrease of temperature, the elemental sulfur dissolved in tetrachlorethy...

Embodiment 2

[0048] Such as figure 1 As shown, the flue gas biological desulfurization sludge is centrifuged or plate-and-frame press-filtered to obtain a sulfur-containing mud cake with a moisture content of 60-80%; then the further dried mud cake (moisture content 90%, and the purity of elemental sulfur is >98%, which can meet the requirements of elemental sulfuric acid and other industries for elemental sulfur raw materials.

Embodiment 3

[0050] Process flow such as figure 1 As shown, the basic process is the same as in Example 1, except that the extractant used is diphenyl disulfide, the mass ratio of mud cake to extractant is 1:10, the extraction temperature is 80°C, and the extraction time is 30 minutes. The cooling crystallization temperature is 20°C.

[0051] In this example, the recovery rate of elemental sulfur is >90%, and the purity of elemental sulfur is >98%.

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Abstract

The invention provides a method for recycling and purifying simple substance sulfur from flue gas biological desulphurization mud. The method takes halogenated hydrocarbon, alkyl or aryl-disulfide, or the mixture of alkyl naphthalene and Naphtha solvent as an extracting agent, extracts and recycles elemental sulfur from the biological desulphurization mud by heating, and purifies the elemental sulfur by cooling and crystallizing. The technique method has high coefficient of recovery of the elemental sulfur (more than 90 percent), the elemental sulfur has high purity (more than 98 percent), the extracting agent can be used in a circulating way, and the consumption is low.

Description

technical field [0001] The invention relates to a method for extracting, recovering and purifying elemental sulfur, in particular to a method for recovering and purifying high-purity elemental sulfur from biological desulfurization sludge by means of heating extraction and cooling crystallization. Background technique [0002] Sulfur dioxide is the main pollutant in the flue gas of power plants and the main substance that forms acid rain. Flue gas biological desulfurization is an air pollution control technology that has emerged in recent years. In 2006, my country built the first flue gas biological desulfurization demonstration line and put it into operation. [0003] The flue gas is sent to the lye washing tower after electrostatic precipitator. The sulfur dioxide in the flue gas is absorbed by the lye in the scrubber, and then the lye that has absorbed the sulfur dioxide is sent to the biological treatment system. In the biological treatment system, sulfur dioxide is ...

Claims

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Application Information

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IPC IPC(8): C01B17/033
Inventor 汪诚文王玉珏赵雪锋张艳琦
Owner TSINGHUA UNIV
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