Production technique for reclaiming ammonium thiosulfate and ammonium thiocyanate from desulfurization waste liquor

A technology of ammonium thiosulfate and ammonium thiocyanate, applied in thiosulfate/dithionite/polythionite, inorganic chemistry, non-metallic elements, etc., can solve the environmental pollution of coal blending system, increase the Coke sulfur content, coke quality decline and other issues, to increase economic benefits, reduce emissions and environmental pollution, good quality

Inactive Publication Date: 2008-02-20
SHANGHAI ZEYIN ENG DESIGN
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Problems solved by technology

However, the desulfurization waste liquid produced in the HPF desulfurization production process is generally not processed and directly sent to the coal blending system to return to the coke oven for production, which brings environmental pollution to

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  • Production technique for reclaiming ammonium thiosulfate and ammonium thiocyanate from desulfurization waste liquor

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Experimental program
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Embodiment

[0017] 1. Pretreatment of sulfur-containing waste liquid

[0018] Send the desulfurization waste liquid of the coking plant into the raw material tank, (the composition of the sulfur-containing waste liquid: volatile ammonia: 0.85%; ammonium thiocyanate: 16%; ammonium thiosulfate: 15%; suspended sulfur: 0.361%; Diphenol: 0.361%), the upper part of the raw material tank is directly heated by steam, so that the temperature of the sulfur-containing waste liquid is controlled at 85°C, and the sulfur-containing waste liquid in the raw material tank is driven into the decolorization tank by the feed pump, and activated carbon is added at the same time to decolorize The tank adopts circular stirring, the average residence time of the solution is 6 hours, and the temperature is controlled at 85°C. After the sulfur-containing waste liquid is decolorized, it enters the tubular ceramic membrane filter. The infusion is pumped to the next process for processing, while the suspended solids ...

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Abstract

The invention discloses a production technology for recovering ammonium thiosulfate and ammonium thiocyanate from the desulfuration waste liquid, whose technological steps are: pretreating the waste liquid containing sulfur, concentrating the waste liquid containing sulfur, crystallizing and separating, and purifying the ammonium thiosulfate. The invention has simple technology and stable operation, which performs machining and processing to the waste liquid containing sulfur in the producing process of HPF desulfuration in a plant, thus, the extracted ammonium thiosulfate and ammonium thiocyanate have good quality and yield, thereby effectively solving the recovering process of the waste water containing sulfur in the producing process of HPF desulfuration. The invention not only reduces the waste water exhausting and environmental pollution, but also recovers the chemical industrial material at the same time, increasing the economic benefits of the enterprises.

Description

technical field [0001] The invention relates to a recovery and treatment process of chemical waste water, in particular to a production process for recovering ammonium thiosulfate and ammonium thiocyanate from desulfurization waste liquid. Background technique [0002] At present, coking plants generally use HPF desulfurization process to produce molten sulfur to recover by-products in coking production. Because HPF desulfurization process has the advantages of less investment, high desulfurization efficiency, low production cost, and easy operation, it is widely used in the coking industry. However, the desulfurization waste liquid produced in the HPF desulfurization production process is generally not processed and directly sent to the coal blending system to return to the coke oven for production, which brings environmental pollution to the coal blending system, serious equipment corrosion, and desulfurization waste liquid enters the coke. The sulfur content of the coke i...

Claims

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Application Information

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IPC IPC(8): C01B17/64C01B3/20
Inventor 高丽娜
Owner SHANGHAI ZEYIN ENG DESIGN
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