Method for preparing thiocyanate and sulfate by utilizing desulfuration waste liquor in coking plant

A technology for thiocyanate and desulfurization waste liquid, which is applied in the field of preparing thiocyanate and sulfate, can solve the problems such as difficulty in improving product quality, achieve the effects of low consumption, high purity, and realization of recycling
CN101985359AActive Publication Date: 2011-03-16INST OF PROCESS ENG CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
INST OF PROCESS ENG CHINESE ACAD OF SCI
Publication Date
2011-03-16

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Abstract

The invention relates to a method for preparing thiocyanate and sulfate by utilizing desulfuration waste liquor in a coking plant, which comprises the following steps of: preparing saturated solution of copper sulfate, mixing the saturated solution with desulfuration waste liquor, and heating and stirring; performing solid-liquid separation to obtain a solid and sulfate liquid; adding aqueous alkali into the solid, heating at the temperature of between 50 and 98 DEG C, and stirring and reacting for 10 to 120 minutes; performing solid-liquid separation on slurry obtained by heating; concentrating the obtained liquid, and freezing for crystallizing and drying to obtain a high-purity thiocyanate product; calcining the obtained solid, adding solution of sulfuric acid, and stirring to produce the copper sulfate for circular use; adding activated carbon into the sulfate liquid, and aerating and oxidizing to purify sulfate; and concentrating the sulfate, and crystallizing and drying to obtain a high-purity sulfate product. The method solves the problem of pollution of the desulfuration waste liquor to the environment, and simultaneously, pollutants can become value products through the production of the high-purity thiocyanate product and the high-purity sulfate product.
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Description

field of invention

[0001] The invention relates to a process method for reusing desulfurization waste liquid in a coking plant, in particular to a method for preparing thiocyanate and sulfate from waste liquid containing high-concentration sulfur-containing anions. Background technique

[0002] Desulfurization waste liquid is commonly used in coke oven gas desulfurization process, such as HPF method, PDS method, improved ADA method, etc., all of which have desulfurization waste liquid discharged.

[0003] Desulfurization waste liquid contains a lot of SO 4 2- , SO 3 2- , S 2 o 3 2- 、SCN - And other substances, large-scale coking plants need to discharge more than 100 tons every day, if discharged directly, it will cause serious environmental pollution. Due to the high salt concentration, the desulfurization waste liquid should not be directly treated by biological methods. Therefore, recycling the valuable components is the preferred method to deal with desulfurizat...

Claims

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