China Nonferrous Metallurgy

Yanggu Xiangguang Copper Industry Co., Ltd. uses the floatation smelting process to smelt copper concentrate. As the arsenic content of the copper concentrate entering the furnace increases, the arsenic content in the electrostatic precipitator dust also increases, and the arsenic continues to circulate in the system, excessive arsenic content in the anode plate will affect the quality of the cathode copper. The company conducted an arsenic extraction test using samples stored during the preliminary test. The extraction process includes two processes: water leaching and acid leaching. The water leaching test showed that if the copper fume was leached, 67.5% of the copper and 69.9% of the zinc in the soot were preferentially removed, and 97.94% of the arsenic was enriched in the water leaching residue. The acid leaching test showed that the leaching rate of arsenic can reach 92.26% under the condition of the mass ratio of liquid to solid is 5∶1, the concentration of sulfuric acid is 200g/L, the reaction temperature is 85℃, and the leaching time is 4h. After washing, the leaching rate of impurity elements such as Cu, Sb, Bi, Zn and Fe is relatively high. When arsenic is recovered, attention should be paid to impurity removal and prevention of heavy metal pollution.