Cyanide-containing waste water recovery and treatment method

Abstract

The invention discloses a cyanide-containing waste water recovery and treatment method. A resin adsorption method, a chemical oxidation method, a coagulating sedimentation method and a biological filter treatment system are included in the method. When cyanide-containing waste water is treated, resin is firstly selected to carry out adsorption and recovery on cyanide in the waste water, an oxidizing agent and a catalyst are added to the waste water after adsorption to carry out oxidation treatment, suspended particulate matter, heavy metal ions and other pollutants in the oxidized waste water are removed through coagulating sedimentation, and pollutants remaining in the waste water are removed through supernate obtained after sedimentation by adopting the multi-stage biological filter treatment system. According to the characteristics that the cyanide-containing waste water generated in the gold production process is high in cyanide concentration, complex in pollutant kind and hard to treat, the resin adsorption method, the chemical oxidation method, the coagulating sedimentation method and the biological filter treatment technology are combined together, deep treatment is carried out on the cyanide-containing waste water collaboratively, the advantages of being good in treatment effect, high in treatment efficiency, stable in system running and simple in technological process and facilitating industrial application implementation are achieved, and the treated waste water can return to the production technological process to be used as reuse water or drained after reaching the standard.

Description

technical field [0001] The invention relates to a method for treating pollutants in the field of environmental protection, in particular to a method for recycling and treating 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 cyanide, the wast...

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.