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A method for extracting cuprous thiocyanate and sodium thiocyanate from desulfurization waste liquid of tannin extract method

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

Inactive Publication Date: 2011-11-30
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

[0020] Take Guangxi Hechi Chemical Co., Ltd. Synthetic Ammonia Industry to produce 1,000 kg of desulfurization waste liquid from tannin extraction process, add 30 kg of activated carbon to this desulfurization waste liquid, heat to 100 ° C, keep stirring for 1 hour, and filter. In the filtrate, add copper carbonate with the amount of substances such as sodium thiocyanate, at 60 ° C and 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 with water three times, and dried to obtain cuprous thiocyanate.

Embodiment 2

[0022] Take 1000 kg of coking desulfurization waste liquid, add 40 kg of activated carbon to the desulfurization waste liquid, heat to 90°C, keep stirring for 3 hours, and filter. In the filtrate, add copper carbonate with the amount of substances such as sodium thiocyanate, at 50 ° C and CO 2 Keep stirring reaction in the atmosphere of 2 hours, there is a large amount of cuprous thiocyanate to precipitate out in the solution. The reaction solution was filtered, washed with water three times, and dried to obtain cuprous thiocyanate.

[0023] Add a mass concentration of 35% sodium hydroxide solution to the cuprous thiocyanate precipitate obtained above, wherein the amount of sodium hydroxide is 2.5 times that of cuprous thiocyanate. After reacting for 3 hours, it was filtered, and the filtrate was evaporated and crystallized to obtain sodium thiocyanate product.

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Abstract

The invention discloses a method for extracting cuprous thiocyanate and sodium thiocyanate from the desulfurization waste liquid of the tannin extraction method. Take 1000 kg of desulfurization waste liquid, add 30-50 kg of activated carbon to the waste liquid, heat to 90-110°C, keep stirring for 1-3 hours, and filter. Add copper carbonate with sodium thiocyanate and other substances to the filtrate, keep stirring and reacting for 1 to 3 hours in an atmosphere of 30-60°C and CO2, a large amount of cuprous thiocyanate precipitates out in the solution, and filter the reaction solution , and washed with water for 1 to 3 times, and dried to obtain cuprous thiocyanate. A sodium hydroxide solution is added to the obtained cuprous thiocyanate precipitate, and the amount of the added sodium hydroxide is 2 to 3 times that of the cuprous thiocyanate. After reacting for 1-3 hours, filter and evaporate the filtrate to obtain sodium thiocyanate product. The method can prepare high-purity cuprous thiocyanate and sodium thiocyanate products, has low production cost, reduces the loss of other alkaline substances in the desulfurization waste liquid of the tannin extraction process, and has good environmental protection benefits, social benefits and economic benefits. benefit.

Description

technical field [0001] The invention belongs to the field of recovery and treatment of coking wastewater, and in particular relates to a method for extracting cuprous thiocyanate and sodium thiocyanate from the desulfurization waste liquid of the tannin extraction process. Background technique [0002] Extraction desulfurization process is one of the liquid phase desulfurization technologies widely used in the field of gas purification in the coal chemical industry in my country. Some side reactions occur during the desulfurization process of the extract method. The main by-products are sodium thiocyanate, sodium thiosulfate, sodium sulfate and sodium bicarbonate. The accumulation of these by-products will increase the viscosity of the desulfurization liquid and greatly reduce the desulfurization efficiency. Therefore, Coking enterprises will regularly discharge desulfurization waste liquid. However, in order to reduce alkali consumption and reduce production costs, many co...

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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