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YST desulphurization and decyanation, and salt extraction method of coke-oven gas

A coke oven gas, desulfurization and decyanation technology, applied in the direction of thiocyanate, thiosulfate/dithionite/polythionate, combustible gas purification, etc., can solve the problem of high catalyst price, long process flow, Big investment and other issues

Inactive Publication Date: 2012-06-27
DALIAN RES & DESIGN INST OF CHEM IND
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Problems solved by technology

[0010] The present invention mainly aims at the problems existing in the above-mentioned wet oxidation method: such as high catalyst price, easy tower blockage due to sulfur generated in the production process, poor environment, long process flow, large investment, and insufficient utilization of H2S and HCN in the gas, etc., and provides more good solution

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  • YST desulphurization and decyanation, and salt extraction method of coke-oven gas
  • YST desulphurization and decyanation, and salt extraction method of coke-oven gas
  • YST desulphurization and decyanation, and salt extraction method of coke-oven gas

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Embodiment

[0050] At present, the world's first production device applying YST desulfurization, decyanation and salt extraction process has been successfully operated in Hangzhou Iron and Steel Coking Plant.

[0051]Hangzhou Iron and Steel Coking Plant had an improved ADA desulfurization unit. After long-term desulfurization, the content of hydrogen sulfide in the gas cannot meet the standard. In addition, the environment is seriously polluted during sulfur melting, the waste liquid is not easy to handle, and the production cost is high. It cannot meet the requirements of the society and Hangzhou Iron and Steel, and urgently needs to be upgraded. After investigating and researching various desulfurization and decyanation methods at home and abroad but not finding one that can meet the requirements of Hangzhou Iron and Steel, we can only find new methods. Under this premise, the inventor made innovations on the basis of summarizing the experience of the predecessors, and after the verific...

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Abstract

According to the invention, various desulphurization technology experiences are integrated; residual ammonia water is used as a main catalyst; hydrogen sulfide and hydrogen cyanide in coal gas are completely converted into sulfur salt, and sulfur salt is extracted by using a physical method. With the method, sulfur is not produced, such that resources are fully utilized, and cyclic economy is realized. A production technology provided by the invention can be divided into two parts, one is an ammonia water desulphurization and decyanation technology, referred to as YS; and the other one is a chemical product sulfur salt extraction technology, referred to as T, wherein chemical products such as ammonium thiocyanate and crude ammonium thiosulfate are extracted from desulphurization drainage. The two technologies are combined into an YST technology. The two forms an inseparable uniform system.

Description

technical field [0001] The invention relates to gas treatment and waste water treatment in the field of environmental protection. It mainly involves the removal of hydrogen sulfide and hydrogen cyanide from coke oven gas and the extraction of ammonium thiocyanate and crude ammonium thiosulfate from the desulfurization effluent. Background technique [0002] Wet oxidation methods are mostly used for desulfurization and decyanation of coke oven gas in my country. There are mainly the following types: improved ADA method, Tower-Schisel method, FRC method, and HPF method developed by my country (including similar ZL method, PDS method), OPT methods, but these methods all have one or another shortcoming or defect. [0003] The improved ADA method is generally post-desulfurization, that is, the desulfurization device is installed after the benzene washing tower, using sodium carbonate as the alkali source and using 2,6 or 2,7 anthraquinone disulfonate and sodium metavanadate as ca...

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Application Information

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IPC IPC(8): C10K1/10C10K1/12C01C3/20C01B17/64
Inventor 姚仁仕郜长水李楠郭鹏辉窦进良翟继国徐晓辉张泽福郭汝寅高权姜永波
Owner DALIAN RES & DESIGN INST OF CHEM IND
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