Removal of Cyanide in Gold Cyanide Residues through Persulfate-Advanced Oxidation Process

The toxic cyanides in gold cyanide residues produced the cyanidation process of extraction threaten environmental safety and inhibit recovery valuable metals. In this study, removal through persulfate-advanced oxidation was investigated, heat activation ultrasonic were tested for removal. results showed that residue could be removed by 2.0 wt.% potassium persulfate at pH 10.0 after 60 min reaction with a efficiency 53.47%. increased to 62.18% T = °C 74.76% an power 100% activation. content leaching solution ultrasonic-activated (3.84 mg/L) reached national standard China. Two kinds free radical scavengers, tert-butanol methanol, used investigate generation radicals. both SO4•− HO• accelerated cyanide, played major role under alkaline conditions. According XPS analysis, focused on rather than pyrite residue. More transferred from liquid phase, leading high has potential application prospects treatment residues.