A method for removing iron and cyanide by mixing copper-containing wastewater and cyanide-containing wastewater

Abstract

The invention discloses a method for removing iron and cyanide by mixing copper-containing wastewater and cyanide-containing wastewater, which specifically includes the following steps: mixing copper-containing acid wastewater and cyanide-containing wastewater, and adding an appropriate amount of ferrous sulfate; Polyacrylamide is added to carry out flocculation and sedimentation, the supernatant is adsorbed with resin, underflow filtration, and the filter residue is washed; S3, add dilute sulfuric acid to the filter residue and inflate, add potassium ferrocyanide and the surfactant zinc naphthalate to the solution after dissolution, Generate china blue dye; S4, for the filtrate, use resin to absorb copper and resin to absorb zinc, and use sulfuric acid solution to desorb copper and zinc respectively; S5, for the liquid after adsorption, adjust its pH to 6-7, pass chlorine dioxide The remaining total cyanide content was reduced to 0.5 mg / L before efflux. The method of the invention has low cost, can produce products with sales value, and can effectively recover metal ions in copper-containing acid wastewater and remove cyanide in cyanide-containing wastewater.

Description

technical field [0001] The invention relates to the technical fields of metallurgy and environmental protection, in particular to a method for removing iron and cyanide by mixing copper-containing wastewater and cyanide-containing wastewater. Background technique [0002] The common treatment method of copper-containing acid wastewater in mines is lime neutralization, but metal ions cannot be recovered well. Neutralized slag is generally stored as waste. At present, in order to recover metal ions in copper-containing acidic wastewater, iron powder replacement method, membrane treatment technology, ion exchange method, chemical precipitation method and other methods have been used for treatment. However, due to the high sulfur content of mine ore, the acidity of copper-containing acid wastewater is high (about 10g / L), iron is high (8-12g / L), copper content is low (80-100mg / L), and the properties of copper and iron are similar. , increasing the difficulty of copper recycling...

AI Technical Summary

Problems solved by technology

[0006] The iron blue method to treat cyanide-containing wastewater can reduce the cyanide content in cyanide-containing wastewater to below 10mg / L, but it has not reached the discharge standard of 0.5mg / L

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