Cyanide-containing wastewater treating method for gold mine

Abstract

The invention discloses a cyanide-containing wastewater treating method for a gold mine. The treating method comprises four steps as follows: sulfur dioxide-air oxidation treatment, coagulating sedimentation treatment, ozone or activated carbon catalytic oxidation treatment and biological activated carbon treatment; in the cyanide-containing wastewater treatment, firstly, the sulfur dioxide-air oxidation method is adopted to remove easily removed cyanide; a coagulant is added in the treated wastewater for coagulating sedimentation to remove heavy metal ions in the wastewater; then ozone and the activated carbon are adopted for catalytic oxidation and contaminants such as residual cyanide that is hard to be treated and rhodanate are removed; lastly, through a biological activated carbon treatment system, contaminants that cannot be removed through chemical methods in the wastewater are removed by biological and physical adsorption methods. According to the invention, as technologies of the sulfur dioxide-air oxidation treatment, the coagulating sedimentation treatment, the ozone or activated carbon catalytic oxidation treatment and the biological activated carbon treatment are integrated and coordinated to conduct an advanced treatment on the cyanide-containing wastewater in the gold mine, the treatment efficiency is high, the treated wastewater can return to manufacturing technology processes and serve as renovated water for using or can be emitted up to standard.

Description

technical field [0001] The invention relates to a pollutant treatment method in the field of environmental protection, in particular to a treatment method for gold mine cyanide-containing wastewater. Background technique [0002] Due to the use of cyanide gold extraction process in the production process of gold mines, a large amount of cyanide-containing wastewater will be produced. This part of cyanide-containing wastewater not only contains a certain amount of highly toxic cyanide, but also contains thiocyanate and copper, zinc, lead Such heavy metal ions, if not effectively treated, will cause major environmental hazards. At present, the methods commonly used at home and abroad to treat cyanide-containing wastewater include acidification recovery method, alkali chlorine method, Inco method, sulfur dioxide method, etc. Although a certain amount of cyanide can be recovered by using acidification recovery method, due to the incomplete recovery of cyanide, the waste water T...

AI Technical Summary

Problems solved by technology

[0002] Due to the use of cyanide gold extraction process in the production process of gold mines, a large amount of cyanide-containing wastewater will be produced. This part of cyanide-containing wastewater not only contains a certain amount of highly toxic cyanide, but also contains thiocyanate and copper, zinc, lead Such heavy metal ions, if not effectively treated, will cause major environmental hazards

At present, the methods commonly used at home and abroad to treat cyanide-containing wastewater include acidification recovery method, alkali chlorine method, Inco method, sulfur dioxide method, etc. Although a certain amount of cyanide can be recovered by using acidification recovery method, due to the incomplete recovery of cyanide, the waste water A certain amount of cyanide will remain in the medium, and at the same time, thiocyanate and some heavy metal ions have not been effectively removed

After the alkali chlorine treatment, a large amount of residual chlorine will remain, and ClCN products will be produced, causing secondary pollution problems. At the same time, heavy metal ions such as copper, zinc, and lead in the wastewater have not been effectively treated.

Although the Inco method and the sulfur dioxide method can make the treatment of cyanide meet the standard, the thiocyanate in the wastewater cannot be treated. In addition, there are many waste residues generated during the treatment of heavy metals, which is likely to cause secondary pollution

Therefore, there is still a lack of ideal methods for the treatment of cyanide-containing wastewater. If this problem can be solved, it will be of great significance to the development of my country's gold production and environmental protection.