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Method for preparing cuprous thiocyanate from coked desulfuration waste liquid

A technology of coking desulfurization waste liquid, cuprous thiocyanate, applied in the direction of thiocyanate, etc., can solve problems such as difficulty in production control, and achieve the effects of low production cost, reduced salt loss, and good environmental protection benefits

Inactive Publication Date: 2012-01-04
陈琳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the CuSO 4 The addition of the treated waste liquid can no longer be reused in the previous process, and the environment is conducive to the oxidation of cuprous, so the production control is difficult

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Take 1,000 kg of TH process desulfurization waste liquid from a coking company, add 30 kg of activated carbon to the desulfurization waste liquid, heat to 100°C, keep stirring for 1 hour, and filter. Add copper carbonate and sodium thiocyanate to the filtrate, at 60 ° C, and in CO 2 Keep stirring in the atmosphere for 3 hours, and a large amount of cuprous thiocyanate precipitates out in the solution. The reaction solution was filtered, washed three times with sodium bisulfite water having a temperature of 50° C. and a mass concentration of 5%, and dried to obtain cuprous thiocyanate.

Embodiment 2

[0024] Take 1000 kg of HPF coking desulfurization waste liquid from Hunan Valin Lianyuan Iron and Steel Co., Ltd., add 36 kg of activated carbon to the desulfurization waste liquid, heat to 90 ° C, keep stirring for 3 hours, and filter. Add copper bicarbonate and sodium thiocyanate etc. to the filtrate, at 50°C, feed sulfur dioxide (SO 2 ) tail gas, kept stirring and reacting for 2 hours, and a large amount of cuprous thiocyanate was precipitated out in the solution. The reaction solution was filtered, washed three times with 5% sodium bisulfite, and dried to obtain cuprous thiocyanate.

[0025] Add a mass concentration of 35% sodium hydroxide solution to the obtained cuprous thiocyanate precipitate, wherein the amount of sodium hydroxide is 2.5 times that of cuprous thiocyanate. After reacting for 3 hours, filter and evaporate the filtrate to obtain sodium thiocyanate product.

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PUM

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Abstract

The invention discloses a method for preparing cuprous thiocyanate from a coked desulfuration waste liquid. The method comprises the following steps: adding 20-60 kg of activated carbon to 1000 kg of coked desulfuration waste liquid, heating to 80-130 DEG C, keeping stirring for 1-3 hours, and then filtering; adding a copper salt the molar of which is equal to that of thiocyanic acid radical ion to filtrate; and keeping stirring and reacting for 1-3 hours at the temperature of 30-60 DEG C in the SO2 or CO2 atmosphere, adding polyacrylamide (PAM) the mass of which is 0.01% that of cuprous thiocyanate in a reaction liquid and stirring for 8-12 minutes at the stirring speed of 100-500 r / min, filtering, washing 1-3 times with 5wt% sodium hydrogen sulfite hot water, and drying so as to obtain cuprous thiocyanate. By using the method disclosed by the invention, the high-purity cuprous thiocyanate or sodium thiocyanate product is prepared, thus the method has the advantages of low production cost and good environmental protection benefits, social benefits and economic benefits.

Description

technical field [0001] The invention belongs to the field of recovery and treatment of coking waste water, and in particular relates to a method for preparing cuprous thiocyanate from coking desulfurization waste liquid. Background technique [0002] Hydrogen sulfide and hydrogen cyanide in coke oven gas are very harmful substances, which will corrode production equipment in the subsequent production process, cause catalyst poisoning, pollute the atmospheric environment and affect human health. From the 1980s to the present, my country's coke oven gas desulfurization and decyanation process has continued to progress and develop, and new process technologies have been continuously used in industrial production, especially the wet oxidation desulfurization process has developed faster and is widely used in the coking industry. At present, the wet process with Chinese characteristics includes FRC method, TH method, improved A.D.A method, tannin extraction method (TV method), PD...

Claims

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Application Information

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IPC IPC(8): C01C3/20
Inventor 陈琳
Owner 陈琳
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