Method for improving whiteness of sodium thiocyanate in coking desulfurization waste liquid

A technology of coking desulfurization waste liquid and sodium thiocyanate, which is applied in the direction of thiocyanate, etc., can solve the problems of low whiteness, unsatisfactory sodium thiocyanate, yellowing of sodium thiocyanate, etc., and achieve high whiteness and easy operation Convenience, the effect of reducing emissions and environmental pollution

Inactive Publication Date: 2014-03-26
北京艾思合众环保科技有限公司
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Problems solved by technology

Because coking desulfurization waste liquid contains colored components such as sulfur, tar, catalyst (containing various non-ferrous metal ions or organic macromolecules) and phenol, the so

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  • Method for improving whiteness of sodium thiocyanate in coking desulfurization waste liquid
  • Method for improving whiteness of sodium thiocyanate in coking desulfurization waste liquid

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[0018] In order to make the technical means, creative features, work flow, and use method of the present invention easy to understand and understand the purpose and effect of the present invention, the present invention will be further described with reference to specific embodiments.

[0019] Such as figure 1 As shown, a device for improving the whiteness of sodium thiocyanate in coking desulfurization waste liquid includes a plate and frame filter press 1, a desulfurization liquid recovery tank 2, a preheater 3, a decolorization tower 4, and a decolorization clear liquid tank connected in sequence 5. Mixed salt evaporator 6, mixing tank 7, settling tank 8, refined salt liquid tank 9, refined salt evaporator 10, refined salt crystallizer 11, centrifuge 12, desulfurization liquid recovery tank 2 and preheater 3 are provided The clear liquid pump 13 is provided with a decolorizing pump 14 between the mixed salt evaporator 6 and the mixing tank 7, and a refined salt pump 15 is provi...

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Abstract

The invention relates to a method for improving whiteness of sodium thiocyanate in coking desulfurization waste liquid. The method sequentially comprises the following steps: (1) pretreatment; (2) decolorization; (3) mixed salt concentration; (4) extraction, separation and decolorization; (5) refined salt concentration and crystallization; (6) refined salt washing and centrifugation. A sodium thiocyanate product with the whiteness of more than 80 is obtained after centrifugation. The extraction method provided by the invention is simple, the operation is convenient, and sodium thiosulfate and sodium sulfate in desulfurization and decyanation waste liquid produced in the PDS desulfurization production process of a coking plant are effectively separated, so that the high-purity sodium thiocyanate separation product is extracted; the extracted sodium thiocyanate has high whiteness and can meet the requirements as a pesticide or an active pharmaceutical ingredient; the emission of wastewater and the environmental pollution of the coking plant are reduced, the chemical raw material with high purity and high added value is simultaneously recovered, and the economic benefits of an enterprise are increased.

Description

technical field [0001] The invention relates to the technical field of utilizing coke oven gas desulfurization waste liquid, in particular to a method for improving the whiteness of sodium thiocyanate in coking desulfurization waste liquid. Background technique [0002] At present, some domestic coking plants adopt PDS wet desulfurization and decyanation process. The process has the advantages of high desulfurization and decyanation efficiency, small investment in equipment, and simple operation. However, this method does not match the corresponding waste liquid treatment technology. The waste liquid produced by PDS wet sodium desulfurization and decyanation process mainly contains sodium thiocyanate, sodium thiosulfate and sodium sulfate. Among them, sodium thiocyanate accounts for 18.5% to 24.5%, sodium sulfate accounts for 7.0% to 11.5%, and sodium thiosulfate only accounts for 0.5% to 1.5%, and the content is relatively small. [0003] At present, waste liquid treatme...

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Application Information

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IPC IPC(8): C01C3/20
Inventor 童国平景建克张扬陈海勇雷晓东章成海陈淦勇杜伟赵孝忠
Owner 北京艾思合众环保科技有限公司
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