Overview of cyanide wastewater treatment
2020-09-18 09:49Introduction：Overview of cyanide wastewater treatment Cyanide is the main pollutant in the process of extracting gold from carbonin pulp, and it is very difficult to deal with. In general, the amount of sewage to be treated by the carbon in pulpplant i
Overview of cyanide wastewater treatment
Cyanide is the main pollutant in the process of extracting gold from carbon in pulp, and it is very difficult to deal with. In general, the amount of sewage to be treated by the carbon in pulp plant is about 2 times that of the raw ore, and the treatment object is the slurry rather than the solution, and the treatment cost is relatively high.
According to the concentration of cyanide, the wastewater produced by gold mine cyanide plant can be divided into three categories: high concentration of cyanide wastewater, usually produced by cyanidation of flotation gold concentrate, cyanide concentration above 350mg/l; medium concentration of cyanide wastewater, The cyanide concentration produced by cyanide concentration in 150~350mg/l from the cyanidation of ores with more complex composition (such as barrel, high sulfur); and the cyanide wastewater with low concentration, produced by the cyanide plant that treats the simple oxidized ore, wastewater with cyanide concentration below 150mg/l.
The main methods used to treat cyanide-containing wastewater in China include chlorine oxidation (also called alkali chlorine process), acidification process, sulfur dioxide air process, activated carbon oxidation process, tailings self-purification and drainage cycle process, etc.
Each process has its applicability, only according to the characteristics of wastewater treatment process can give consideration to environmental benefits, economic benefits and social benefits. According to the characteristics of cyanide-containing wastewater produced by the carbon in pulp extraction process, most of the carbon in pulp plants adopt alkali chlorine process as the wastewater treatment process. In addition, the activated carbon adsorption process and the waste water recycling process of tailings reservoir are also applicable to the treatment of wastewater from the carbon in pulp plant, which has been applied in some mines.
