Method for recycling and purifying elemental sulfur from flue gas biological desulphurization sludge
A technology for biological desulfurization and elemental sulfur, applied in chemical instruments and methods, sulfur compounds, inorganic chemistry, etc., can solve the problems such as the recovery and purification of elemental sulfur, and the lack of a good method for the treatment of biological desulfurization sludge. The effect of resource utilization, convenient production and reasonable price
Inactive Publication Date: 2011-01-05
TSINGHUA UNIV
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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
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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
A method for recovering and purifying elemental sulfur from flue gas biological desulfurization sludge technical field 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 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. 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 bio...
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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