Method for extraction of high purity sodium thiocyanate from desulfurization waste liquid or desulfurization liquid mixed salt

A technology of desulfurization waste liquid and sodium thiocyanate, applied in the direction of thiocyanate, etc., can solve the problems of low price, poor quality, meager profit, etc., and achieve significant economic benefits, low production energy consumption, fluent and short process effect

Inactive Publication Date: 2014-04-16
秦飞
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Problems solved by technology

[0007] However, no matter which method the sodium thiocyanate product extracted is low in content and poor in quality, the sodium thiocyanate product produced by this type of method has a small market capa

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  • Method for extraction of high purity sodium thiocyanate from desulfurization waste liquid or desulfurization liquid mixed salt
  • Method for extraction of high purity sodium thiocyanate from desulfurization waste liquid or desulfurization liquid mixed salt
  • Method for extraction of high purity sodium thiocyanate from desulfurization waste liquid or desulfurization liquid mixed salt

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Embodiment Construction

[0022] The present invention will be further described in detail according to the examples below.

[0023] A method for extracting high-purity sodium thiocyanate from desulfurization waste liquid, that is, an alcohol extraction method.

[0024] Sodium thiocyanate is easily soluble in alcohols, and a small amount of impurities such as sodium thiosulfate, sodium sulfate, and sulfur are insoluble in alcohols, and then 1 molecule of sodium thiosulfate can easily form 5 crystals with 5 molecules of water at low temperature The characteristics of sodium thiosulfate in water, cleverly separate sodium thiosulfate, a small amount of sodium sulfate, sulfur and part of water from alcohol solution, and obtain high-purity sodium thiocyanate product.

[0025] Evaporate desulfurization waste liquid initially (or use mixed salt made from desulfurization liquid as raw material), and when it reaches a certain concentration (do not need to evaporate to dryness, a part of water is allowed), then ...

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Abstract

The invention discloses a method for extraction of high purity sodium thiocyanate from a desulfurization waste liquid or a desulfurization liquid mixed salt. The method comprises the steps of: 1) subjecting the desulfurization waste liquid to preliminary evaporation, conducting cooling to lower than certain temperature when reaching certain concentration, then taking alcohol as a solvent, and injecting the alcohol thereinto, and keeping the temperature above 48DEG C in the process; 2) then performing cooling to less than 48DEG C so as to make sodium thiosulfate therein and free water generate sodium thiosulfate of crystal water and make the generated product precipitate in the alcohol solution, and then separating the sodium thiosulfate from a small amount of impurities by filtration; and 3) concentrating the alcohol solution, cooling and recovering the evaporated alcohol, returning the product to the system to undergo recycling, and carrying out evaporation, concentration and crystallization, thus obtaining the high purity sodium thiocyanate. The method provided by the invention has the advantages of low production energy consumption, short process, simple operation, good product quality, and obvious economic benefits.

Description

technical field [0001] The invention relates to an extraction method, in particular to a method for extracting high-purity sodium thiocyanate from desulfurization waste liquid or mixed salt obtained from desulfurization liquid. Background technique [0002] In the coke production process, a large amount of gas will be produced, and the gas contains a certain amount of hydrogen sulfide and hydrogen cyanide. In order to avoid pollution to the atmosphere, the coke oven gas must be desulfurized and decyanidated. A large amount of desulfurization waste liquid will be generated during the treatment process. The components of desulfurization waste liquid are: sodium thiocyanate, sodium thiosulfate, water and a small amount of impurities such as sodium sulfate and sulfur. [0003] At present, the total amount of desulfurization waste liquid discharged by domestic coking enterprises is about 1 million tons, most of which are discharged directly without treatment, or mixed with cokin...

Claims

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Application Information

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