Treatment method for gold-smelting cyanide-containing wastewater

Abstract

The invention discloses a treatment method for gold-smelting cyanide-containing wastewater. The treatment method comprises the four steps of carrying out acidification reaction, carrying out blow-off treatment, carrying out Fenton reaction and carrying out SO2 air-method treatment. The treatment method disclosed by the invention has the advantages of simple process, small equipment investment, stability in operation, convenience in control, low cost and the like; steps, such as pretreating cyanide through carrying out acidification reaction and carrying out blow-off, treating thiocyanate radicals through carrying out Fenton reaction and carrying out deep treatment on the cyanide by an SO2 air method, are combined organically and are used for jointly treating the gold-smelting cyanide-containing wastewater, so that the content of the cyanide in the wastewater is greatly lowered, the quality of yielding water can stably reach the standards, and the technical problems that the existing cyanide-containing wastewater treatment processes are difficult in control and difficultly stably reach the standards are solved.

Description

technical field [0001] The invention relates to the technical field of cyanide-containing wastewater treatment, in particular to a treatment method for cyanide-containing gold smelting wastewater. Background technique [0002] At present, with the improvement of people's awareness of environmental protection and emission reduction, the treatment and recycling of smelting wastewater has become more and more important. Cyanide-containing wastewater refers to industrial wastewater containing CN groups. A large amount of cyanide-containing wastewater will be discharged in the production processes of non-ferrous metal minerals such as gold, silver and copper extraction, cyanide electroplating, chemical industry, coking, heat treatment, etc., especially in the production process of gold dressing and smelting. ˉ The mass concentration is high, and it also contains a large amount of heavy metals, thiocyanate and other compounds, which seriously pollute the external water environment...

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Problems solved by technology

[0003] At present, in practical engineering applications, the final effluent obtained after the cyanide-containing wastewater in the gold smelting industry is treated with cyanide through the traditional oxidation process is difficult to meet the standard stably

Through the long-term experimental research of the inventor, it is found that the main reason is that the wastewater contains thiocyanate. During the oxidation process, the thiocyanate degrades and consumes the oxidant while generating intermediate products such as cyanide and cyanate salts, thereby making the cyanide oxidation process in the wastewater It is difficult to determine the consumption of oxidant, pH and oxidation-reduction potential (ORP) and other operational control parameters, so the treatment of cyanide-containing wastewater in the gold smelting industry is difficult to meet the standard stably by traditional oxidation technology

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