Abstract: The decyanation of cyanide tailings from a gold mine was studied through the alkali chlorine method,the hydrogen peroxide oxidation method,and the solid-liquid separation method.After the cyanide tailings are treated by these 3 methods,the mass concentration of the total cyanide compound in the toxic leaching solution is ＜5 mg/L.In comparison,the solid-liquid separation method had a higher removal rate of total cyanide compounds and did not require the use of chemicals.The method was subsequently used in industrial-scale validation tests.The results showed that the solid-liquid separation process was stable,the average water content of the treated tailings was 18.56 %,and the mass fraction of total cyanide compounds was less than 1 500 mg/kg,the mass concentration of total cyanide compounds in the toxic leaching solution is steadily ＜5 mg/L,which can lower the environmental risks to reuse cyanide tailings and extend disposal pathways.