Research On Chloridizing Segregation-flotation Technology For Cyanide Tailings

In recent years, China’s gold industry has been developing rapidly, at the same time, the cyanide tailings deposition is also increasing year by year. Cyanide tailings contain residues of valuable elements such as gold and silver, and will cause the waste of resources and pollution of the environment without any process. This paper adopt segregation-chloride flotation enrichment to recover the gold, silver and copper from cyanide tailings from Xinjiang star tower mining co. LTD.This paper studied the following three points from the perspective of thermodynamics:(1) the volatility, stability chlorinated ability of the related chloride;(2) the mechanism of commonly used chloride;(3) the chloride mechanism of segregation under weak reducing atmosphere.The chloridizing segregation-flotation process was adopted to process the cyanide tailings in this experiment. The results showed when CaCl2·2H2O was used as the chlorinating agent, then the experiments demonstrated the best chloride condition with4%CaCl2·2H2O,0.3%CuO as well as reducing agent coke with size between0.2-0.098mm were added at the temperature of800℃. After segregation for90min, the tailings was grinded to ensure the size of pellets at200mesh accounted for75%. In the flotation process,200g/t isoamyl xanthate and100g/t ammonium dibutyl dithiophosphate were used as flotation reagent with pH value controlled at8. Under this optimal condition, the ore concentrate with the grade of by Au, Ag and Cu were18.23g/t,129.32g/t and3.43%,the recovery percent of Au, Ag and Cu can achieve as high as70.1%,82.9%and84.3%, respectively.The research indicates that chloridizing segregation-flotation technology process is viable, and it set an example for other industrial waste residue and household refuse.