PROCESS FOR THE DETOXIFICATION OF CYANIDE-CONTAINING AQUEOUS SOLUTIONS

摘要

The invention relates to a process for the detoxification of aqueous solutions containing cyanides and/or cyano complexes in the presence of heavy metals from the group consisting of Mn, Co, Ni, Cu, Cd and Zn, more particularly Cu, by oxidative treatment of the solutions with peroxide compounds at pH values of 8 to 12. Peroxide compounds from the group consisting of alkali metal and alkaline earth metal perborates, alkali metal percarbonates and alkaline earth metal peroxides being used as the peroxide compounds. The peroxide compounds are added as such to the solutions to be detoxified or are formed in situ therein from hydrogen peroxide and the other components. Sodium perborate, sodium percarbonate and calcium peroxide are preferred. The process is more effective in regard to the quantity of peroxide compounds used than the known process using hydrogen peroxide and also enables manganese-containing solutions to be detoxified.