The biological desulfurization method is mainly to cultivate bacteria for sulfur-containing compounds, make them oxidized by biochemical reaction with sulfur-containing compounds in coal, and then remove sulfur from coal by acid washing, filtration and other methods. At present, biological desulfurization of coal mainly includes bioleaching and surface treatment. The bioleaching method has the advantages of simple device, strong pertinence and little damage to the organic matter in the coal, but the treatment time is long, and the waste liquid treatment is not timely, which is easy to cause secondary pollution. Microbial surface treatment method is to crush coal into particles and mix them with water, and blow micro bubbles under them. Bubbles are attached to the surface of coal and pyrite. When microorganisms are added to the aqueous solution, the hydrophobicity of pyrite changes to hydrophilicity due to the attachment of microorganisms to the surface of pyrite, while the surface of coal particles still maintains its hydrophobicity. Thus, the flotation column is used to separate them, and the desulfurization time is significantly shortened. For the removal of different forms of sulfur in coal, different kinds of microbial strains are required, and the biological method can only remove a certain amount of organic sulfur. In addition, considering the selectivity and effectiveness of microbial strains, reactor type, desulfurization process stability, desulfurization cycle and other factors, it is not possible to apply microbial technology to remove sulfur from coal in the actual industrial production process.
For high sulfur coking coal, physical desulfurization method can only remove inorganic sulfur from coal. Although chemical and biological methods can remove some organic sulfur from coal, organic sulfur is associated with the whole organism of coal. Such methods inevitably change the organic chemical structure of coal in the process of removing organic sulfur from coal, thus destroying the adhesion and coking of coking coal, and adversely affecting the quality and strength of coking coke. In the process of thermal conversion, the changing behavior of sulfur is regulated to make more sulfur release with volatile matter, reduce the retention of sulfur in coke, and reduce the sulfur content in coke. It has become an effective method to make rational use of high sulfur coking coal, increase the proportion of high sulfur coal in coking coal blending, and reduce the cost of coal blending.
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