Cyanated wastewater treatment method

Abstract

The invention discloses a cyanated wastewater treatment method. The method consists of three steps, namely the step of carrying out electrochemical treatment, the step of carrying out coagulative precipitation treatment and the step of carrying out ozone / activated-charcoal catalytic oxidation treatment, wherein tractable cyanide is firstly removed by adopting an electrochemical treatment method, then, coagulative precipitation is carried out through adding a zinc sulfate solution and a coagulation agent, so as to remove metal cyanide complexes and heavy metal ions from the wastewater, and finally, pollutants, which are difficultly removed by chemical methods and coagulative precipitation, are removed from the wastewater by an ozone / activated-charcoal catalytic oxidation treatment system through the synergism of ozone and activated charcoal. According to the method, based on the characteristic that pollutants contained in the cyanated wastewater of gold mines are complicated and intractable, an electrochemical treatment technology, a coagulative precipitation technology and an ozone / activated-charcoal catalytic oxidation technology are combined together and carry out deep treatment on the cyanated wastewater of the gold mines in a synergistic manner, thus, the treatment effect is good, the treatment efficiency is high, the system operation is stable, the process flow is simple, the realization of industrial application is facilitated, and the treated wastewater can be returned to the production process flow and used as reclaimed water or be discharged in a standardized manner.

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 cyanidation 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 wastewater will be produced. This part of cyanide wastewater not only contains a certain amount of highly toxic cyanide, but also contains thiocyanate, COD, copper, and zinc. , lead and other heavy metal ions, if not effectively dealt with, will produce major environmental hazards. At present, the methods commonly used at home and abroad to treat cyanide wastewater include acidification recovery method, alkali chlorine method, Inco method, sulfur dioxide method, etc. Although the acidification recovery method can recover a certain amount of cyanide, due to the incomplete recovery of cyanide, the wastewater There will be a certain amount of ...

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 wastewater will be produced. This part of cyanide wastewater not only contains a certain amount of highly toxic cyanide, but also contains thiocyanate, COD, copper, and zinc. , lead and other 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 wastewater include acidification recovery method, alkali chlorine method, Inco method, sulfur dioxide method, etc. Although the acidification recovery method can recover a certain amount of cyanide, due to the incomplete recovery of cyanide, the wastewater 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 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.