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Method for preparing high-quality potassium rhodanide by using coke oven gas waste liquor with sulfur and cyanogen removed

A technology for desulfurization, decyanation, and coke oven gas, which is applied in thiocyanic acid and other directions to achieve the effects of low cost and simple process

Active Publication Date: 2013-10-30
江苏燎原环保科技股份有限公司
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[0015] Vacuum potassium carbonate method coke oven gas desulfurization and decyanation waste liquid, waste liquid index (weight content): thiocyanate: about 5.56%; sulfate: about 0.72%; formate: about 1.76%; chloride ion: about 0.048%; Carbonate: about 5.3%; potassium bicarbonate about 0.6%; and potassium cyanide 0.01%-2%.

[0016] Take 1000g of waste liquid, first add 3 grams of auxiliary agent S potassium sulfite to the waste liquid, stir for 60 minutes, then add about 50g of auxiliary agent E barium hydroxide, and stir for about 30 minutes. Then filter to remove solid impurities, add 65 grams of auxiliary agent D ammonium sulfate to the filtrate to adjust the pH value to 9, then decolorize and concentrate the filtrate, and centrifuge after cooling and crystallization to finally obtain about 62 grams of product potassium thiocyanate. The weight content of potassium thiocyanate produced is above 99%

[0017] The centrifuged mother liquor can be concentrated by circulation. ...

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Abstract

The invention discloses a method for preparing high-quality potassium rhodanide by using a coke oven gas waste liquor with sulfur and cyanogen removed. The method comprises the steps of: first adding an assistant S to the waste liquor to remove cyanide ions in the waste liquor system, wherein the addition is 50%-200% of the molar weight of cyanide ions; adding an assistant E according to the contents of carbonate radicals, bicarbonate radicals and sulfate radicals to remove the three, wherein the addition is 50%-200% of the total molar weight of the carbonate radicals, bicarbonate radicals and sulfate radicals; adding an assistant D and regulating the pH value to 4-10; and conducting concentration and decoloring with activated carbon, and concentrating and crystallizing to obtain a finished product. The method disclosed by the invention has simple process and low cost; and the output product contains more than 99 wt% of potassium rhodanide.

Description

[0001] technical field [0002] The invention relates to a method for preparing high-quality potassium thiocyanate by using coke oven gas desulfurization and decyanation waste liquid, belonging to the technical field of chemical industry. Background technique [0003] The vacuum potassium carbonate method coke oven gas desulfurization and decyanation process uses potassium carbonate solution to directly absorb H2S and HCN in the gas, which belongs to the wet absorption desulfurization process. The acid gas containing H2S and HCN after desulfurization and decyanation by vacuum potassium carbonate method can be used to produce elemental sulfur by Claus method or sulfuric acid by contact method. The coking plant of Maanshan Iron and Steel Co., Ltd. and Wuhan Pingmei Wuhan Iron and Steel United Coking Co., Ltd. adopt vacuum potassium carbonate desulfurization and Claus method to produce sulfur equipment imported from Germany; the coking plant of Angang New District (Bayuquan) a...

Claims

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Application Information

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IPC IPC(8): C01C3/20
Inventor 邓百策王喜军冯启明储正相崔健周庆周旭峰吴战平
Owner 江苏燎原环保科技股份有限公司
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