Cyanogens-containing sewage water multiple-effect vacuum evaporation recovery method and recovery device

A multi-effect vacuum evaporation and recovery device technology, applied in water/sewage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problems of chemical secondary pollution, high cost, poor effect, etc. Achieve cost savings, avoid high processing costs, and simplify the process

Inactive Publication Date: 2009-06-10
王安理 +2
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Problems solved by technology

These methods are either poor in effect or high in cost, and some also cause secon...

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  • Cyanogens-containing sewage water multiple-effect vacuum evaporation recovery method and recovery device
  • Cyanogens-containing sewage water multiple-effect vacuum evaporation recovery method and recovery device

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[0020] Such as figure 1 As shown, the recovery method of the present invention is: earlier with cyanide-containing sewage and sulfuric acid, wherein the addition ratio of sulfuric acid and cyanide-containing sewage is: determine according to the pH value in the treated sewage and the amount of cyanide, under the action of vacuum negative pressure , the pressure is -0.08Mpa, self-inhalation cyanide release reaction tower, during the process of spraying and descending the cyanide-containing sewage from the upper part of the tower body, hydrocyanic acid evaporates and escapes from the sewage under the action of vacuum suction and is separated, and is inhaled Vacuum system, fully mixed and absorbed with 35% sodium hydroxide solution, produces a chemical reaction to generate liquid sodium cyanide, and the generated sodium cyanide is returned to the cyanide gold extraction process for reuse.

[0021] Such as figure 2 As shown, the recovery device of the present invention includes ...

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Abstract

The invention relates to a cyanide-containing sewage multi-effect vacuum evaporation recovery method and a cyanide-containing sewage multi-effect vacuum evaporation recovery device. The cyanide-containing sewage multi-effect vacuum evaporation recovery method comprises the following steps: firstly, cyanide-containing sewage and sulfuric acid are sucked and escaped into a cyanide reaction tower under the action of vacuum negative pressure; secondly, when the cyanide-containing sewage is sprayed and declined from the upper part, hydrocyanic acid is evaporated and escaped from the sewage and separated out under the action of vacuum suction, sucked into a vacuum system, fully mixed with lye and absorbed, and subjected to chemical reaction to generate liquid sodium cyanide; and thirdly, the generated sodium cyanide is returned back to the process of cyanidation and gold extraction and reutilized. The method has simple technological process, performs one-off multi-effect vacuum evaporation recovery, has the recovery rate of 99 percent, solves the problems of high processing cost and easy generation of secondary pollution in the prior cyanide-containing sewage treatment process, achieves the aim of changing waste into valuable, directly recovers and reutilizes the cyanide-containing sewage, greatly saves the cost, and is energy-saving and environment-friendly.

Description

technical field [0001] The present invention relates to a method for recycling cyanide-containing sewage, and at the same time, the purpose of the present invention is to provide a multi-effect vacuum evaporation recovery device for cyanide-containing sewage. Background technique [0002] Gold extraction by cyanidation has a history of hundreds of years, and it has always been the most important method for extracting gold from gold mines. There are currently two different cyanide processes, the zinc cyanide powder displacement precipitation process and the carbon slurry process, both of which produce wastewater containing a large amount of cyanide. Because cyanide is highly toxic, the toxic cyanide should be removed from the cyanidation gold extraction wastewater before it is discharged, so that it can meet the specified discharge standard before it can be discharged into the sewer or stream. The index after treatment must absolutely meet the standard; if Untreated discharg...

Claims

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Application Information

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IPC IPC(8): C02F1/58C01C3/10C22B11/08C02F101/18C02F103/16
Inventor 王安理王树芳吕周本
Owner 王安理
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