Cyanide waste water comprehensive recovery treatment method

Abstract

The invention discloses a cyanide waste water comprehensive recovery treatment method. The method is composed of a resin adsorption method, an ozone oxidation method, a coagulant-sedimentation method and the biological filter treatment technology. When cyanide waste water is treated, firstly, resin is selected and used for adsorbing and recovering cyanide in the waste water, ozone is delivered to the adsorbed waste water for oxidation treatment, coagulant-sedimentation is conducted on the oxidized waste water so as to remove pollutants such as suspended particulate matter and heavy metal ions in the waste water, supernate obtained after sedimentation is treated through a biological filter treatment system, and therefore remaining pollutants in the waste water are removed. According to the characteristics that the concentration of cyanide in the cyanide waste water generated in the gold production process is high, pollutant types are complex, and the pollutants are difficult to treat, the resin adsorption method, the ozone oxidation method, the coagulant-sedimentation method and the biological filter treatment technology are combined together to collaboratively conduct deep treatment on the cyanide waste water of a gold production enterprise, the cyanide waste water comprehensive recovery treatment method has the advantages of being good in treatment effect, high in treatment efficiency, stable in system operation, simple in technological process, capable of facilitating industrial application and the like, and the treated waste water can return to the production technological process and serve as reuse water to be used or can be drained when reaching the standard.

Description

technical field [0001] The invention relates to a pollutant treatment method in the field of environmental protection, in particular to a method for comprehensive recovery and treatment of cyanide-containing wastewater. Background technique [0002] Due to the use of cyanidation gold extraction process in the production process of gold production enterprises, a large amount of cyanide-containing wastewater will be produced. These wastewater not only contain a large amount of highly toxic cyanide, but also contain thiocyanate and copper, zinc, lead, etc. If the heavy metal ions are not treated effectively, there will be a major environmental hazard. 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 cyan...

AI Technical Summary

Problems solved by technology

[0002] Due to the use of cyanidation gold extraction process in the production process of gold production enterprises, a large amount of cyanide-containing wastewater will be produced. These wastewater not only contain a large amount of highly toxic cyanide, but also contain thiocyanate and copper, zinc, lead, etc. If the heavy metal ions are not treated effectively, there will be a major environmental hazard

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 sustainable development of my country's gold industry and the environmental protection of gold mines.