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Method for preparing sodium thiocyanate from ammonia desulphurization waste liquid and sodium carbonate as raw material

A technology for ammonia desulfurization and desulfurization waste liquid, applied in thiocyanic acid and other directions, can solve the problems of low efficiency, pollution and low price of ammonium thiocyanate treatment, and achieve the effects of low cost, simple process and high income

Inactive Publication Date: 2016-07-27
BEIJING FUHAITIAN ENVIRONMENTAL SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current domestic ammonium thiocyanate market is saturated and the price is relatively low. Therefore, the treatment efficiency for ammonium thiocyanate in desulfurization waste liquid is relatively low, which will become a burden for enterprises. If it is directly discharged, it will cause serious pollution.

Method used

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  • Method for preparing sodium thiocyanate from ammonia desulphurization waste liquid and sodium carbonate as raw material
  • Method for preparing sodium thiocyanate from ammonia desulphurization waste liquid and sodium carbonate as raw material
  • Method for preparing sodium thiocyanate from ammonia desulphurization waste liquid and sodium carbonate as raw material

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Embodiment

[0025] In this embodiment, sodium thiocyanate is prepared from ammonia desulfurization waste liquid and sodium carbonate, and the overall process route is as follows: figure 1 As shown, the desulfurization waste liquid is first decolorized, the decolorized clear liquid and sodium carbonate are heated and reacted in the reactor, the tail gas is absorbed and treated, the reaction liquid is filtered, concentrated, and centrifuged to obtain mixed salt, and the mixed salt is extracted, filtered, concentrated, and centrifuged. Sodium thiocyanate is obtained.

[0026] Specific as figure 2 As shown, the desulfurization waste liquid is pumped into the preheater 2 by the decolorization feeding pump 1 for heat exchange, the temperature is controlled at 85±5°C, and then put into the decolorization tower 3 for decolorization, and then passed through the single cylinder upper and lower basket filter 4 Filter and enter the decolorized clear liquid tank 5; the decolorized clear liquid is pu...

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Abstract

The invention discloses a method for preparing sodium thiocyanate from an ammonia desulphurization waste liquid and sodium carbonate as raw materials. The method is characterized by comprising the following steps of: by taking the ammonia desulphurization waste liquid and the sodium carbonate as the raw materials, decoloring the ammonia desulphurization waste liquid, implementing temperature rise reaction on the decolored supernate and sodium carbonate in a reaction kettle, absorbing and treating a tail gas, filtering, concentrating and centrifuging a reaction liquid so as to obtain mixed salt, and extracting, filtering, concentrating and centrifuging the mixed salt, thereby obtaining sodium thiocyanate. By adopting the method disclosed by the invention, not only is a novel direction developed for treatment of the ammonia desulphurization waste liquid, but also the method is simple in equipment and process, low in cost, high in yield, high in benefit, beneficial to further encouragement of companies to retreat and recycle desulphurization waste liquids, and has a great significance for environment protection.

Description

technical field [0001] The invention relates to a method for preparing sodium thiocyanate, in particular to a method for preparing sodium thiocyanate from ammonia desulfurization waste liquid. technical background [0002] Coke oven gas commonly used wet desulfurization is divided into sodium carbonate alkaline desulfurization and ammonia desulfurization. Among them, about 90% of the coking enterprises adopt the ammonia desulfurization method, using the ammonia produced during coking as the alkali source, and the desulfurization waste liquid mainly contains ammonium thiocyanate, ammonium thiosulfate, ammonium sulfate, etc. A relatively high-value product extracted from desulfurization waste liquid is ammonium thiocyanate. However, the current domestic ammonium thiocyanate market is saturated and the price is relatively low. Therefore, the treatment efficiency for ammonium thiocyanate in desulfurization waste liquid is relatively low, and it becomes a burden for enterprises....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C3/20
CPCC01C3/20
Inventor 陈淦勇付天臣张扬张鹏飞
Owner BEIJING FUHAITIAN ENVIRONMENTAL SCI & TECH CO LTD
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