Abstract:Arsenic content was reduced by leaching arsenic-bearing copper ore with sodium hypochlorite under alkaline oxidizing condition. The results show that arsenic leaching rate is 47.53% under the optimum conditions including temperature of 30 ℃, particle size of 54~74 μm, sodium hypochlorite concentration of 0.39 mol/L, sodium hydroxide dosage of 1.67% of sample ore, leaching time of 90 min, and ratio of liquid to solid of 40︰1(mL/g). Arsenic leaching rates of sodium hypochlorite leaching under microwave and low-pressure glow discharge plasmas are 66% and 72.88% respectively, while arsenic content in treated copper ore is reduced to 0.15% and 0.12% respectively, which meets arsenic index requirement of second grade copper concentrates.