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Method for preparing high-quality sodium thiocyanate from desulfurized and decyanated waste liquid of coke oven gas

A technology for desulfurization, decyanation, and sodium thiocyanate, applied in the direction of thiocyanic acid and the like, can solve the problems of long process, difficult promotion and high investment, and achieve the effect of simple process and low cost.

Active Publication Date: 2013-11-20
江苏燎原环保科技股份有限公司
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Problems solved by technology

[0005] However, this technology has a long process and high investment, and it is difficult to promote

Method used

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Embodiment Construction

[0018] The index of coke oven gas desulfurization and decyanation waste liquid with sodium (sodium carbonate, sodium hydroxide) as alkali source is (by weight): sodium thiocyanate: about 5%-25%; sodium sulfate: 1%-10% ; Sodium thiosulfate: 0.1%-15%,; Sodium carbonate and a small amount of other substances.

[0019] Take 1000g of waste liquid, sodium thiocyanate: about 15%, sodium sulfate: 5%, sodium thiosulfate: 7%, and a small amount of sodium carbonate.

[0020] First, add 72 grams of auxiliary agent A sodium persulfate to the waste liquid, stir for 30 minutes, then filter to remove solid impurities, add 3 grams of auxiliary agent C sodium hydroxide to the filtrate to adjust the pH value to 6.5, then concentrate the filtrate, cool and crystallize Sodium sulfate is separated by centrifugation afterward, and then the system finally obtains 82 grams of product sodium thiocyanate through active carbon decolorization and crystallization. The weight content of the potassium thioc...

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Abstract

The invention discloses a method for preparing high-quality sodium thiocyanate from a desulfurized and decyanated waste liquid of coke oven gas, which comprises the following steps: decolorizing and filtering the desulfurized and decyanated waste liquid through activated carbon, and adding an assistant A into the waste liquid while stirring, wherein the specific quantity of the assistant A is 50-200% of the molal quantity of sodium thiosulfate in the waste liquid; removing sodium thiosulfate ions in the waste liquid system, filtering to remove insoluble substances, and then adding a small quantity of assistant C into the filtrate to regulate the pH value to 5-10; distilling and concentrating to remove the moisture, and centrifuging to separate out inorganic salt impurities based on the difference of various substances in solubility under different temperatures and concentrations; and decolorizing through activated carbon, and further concentrating and crystallizing to produce the sodium thiocyanate finished product. According to the invention, the process is simple, the cost is low, and the weight content of the produced potassium thiocyanate is more than 99%.

Description

[0001] technical field [0002] The invention relates to a method for preparing high-quality sodium thiocyanate from desulfurization and decyanation waste liquid of coke oven gas, which belongs to the technical field of chemical industry. Background technique [0003] "Coal Chemical Industry" magazine, Issue 01, 2011, published the article "New Technology for Waste Liquid Treatment of HPF Desulfurization Process of Coke Oven Gas" written by Liu Chenming, Wang Bo, Cao Hongbin, Sheng Yuxing, Li Yuping, Lin Xiao, Zhang Yi, etc., which briefly described HPF desulfurization process flow, and its advantages and disadvantages were analyzed; several common desulfurization waste liquid treatment methods were compared, and a new HPF desulfurization process waste liquid treatment technology involving multiple processes such as reaction and separation was introduced emphatically. [0004] This technology realizes the recycling of desulfurization waste liquid, and has the advantages of h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C3/20
Inventor 冯启明崔健邓百策储正相周庆王喜军周旭峰吴战平
Owner 江苏燎原环保科技股份有限公司
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