Method for extracting sodium thiocyanate from coking desulfurization waste liquid

Method for extracting sodium thiocyanate from coking desulfurization waste liquid

  • CN 102,259,896 A
  • Filed: 06/21/2011
  • Published: 11/30/2011
  • Est. Priority Date: 06/21/2011
  • Status: Active Application
First Claim
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1. the method for extracting sodium thiocyanate from coking desulfurization waste liquid, its step is as follows:

  • coking desulfurization waste liquor adds the 2-6wt% active carbon, being heated to 70-90 ℃

    also keeps stirring 1-2 hour, filter, filtrate adds sulfuric acid to pH=3.5-4.5 in closed container, being heated to 60-80 ℃

    also keeps stirring 1-2 hour, the sulfur dioxide gas body and function conduit of overflowing is drawn and is absorbed with weak aqua ammonia, reaction is filtered after finishing, filtrate in closed container, add with filtrate in the goods and materials such as ammonium thiocyanate amount NaOH and with filtrate in the calcium hydroxide of ammonium sulfate Isoequivalent weight, being heated to 50-70 ℃

    also keeps stirring 1-2 hour, the ammonia of overflowing is drawn with conduit and water absorbs into weak aqua ammonia, reaction is filtered after finishing, and the filtrate evaporative crystallization obtains the sodium sulfocyanate product.

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