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Prepare the effective ways of the removing toxic substances of the waste gas and waste water containing cyanide in the method for alkali metal cyanide
Prepare the effective ways of the removing toxic substances of the waste gas and waste water containing cyanide in the method for alkali metal cyanide
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机译:制备碱金属氰化物方法中去除氰化物废气和废水中有毒物质的有效方法
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摘要
The invention relates to a method for producing alkali metal cyanides as solids, comprising the steps: i) an absorption step in the form of the absorption of hydrogen cyanide from a syngas containing hydrogen cyanide in an aqueous alkali metal hydroxide solution; ii) a preparation step for the waste gases containing cyanide that have accumulated in step i); iii) a crystallization step in the form of the introduction of the alkali metal cyanide solution into an evaporative crystallizer; iv) a condensation step for the vapour containing cyanide that has accumulated in step iii) to obtain a vapour condensate containing cyanide; v) a recirculation step, in which the vapour condensate containing cyanide that has been obtained in step iv) is used as an aqueous liquid in step ii).
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