Efficient Extraction of Cd in Zn Recovery Process by Wet Leaching of Zn-Rich Dust

This study develops a green and efficient hydrometallurgical process for the recoveryRecovery of Zn and CdCd from Zn-rich dust after pyrometallurgical treatment of iron and steel metallurgical dust. The feasibility of separating Zn, Cd, and Fe in the leaching system was confirmed by thermodynamic analysisThermodynamic analysis. In the acid leaching process, dilute H2SO4 is used as the leaching agent, Zn and CdCd are leached and recovered in the liquid in the form of Zn2SO4 and Cd2SO4. This article studies the leaching behavior of CdCd and Bi under different experimental conditions (such as H2SO4 concentration, liquid-to-solid ratio, temperature, and reaction time). Under the optimal conditions, the leaching rates of CdCd and Bi are 93.15% and 0.78% respectively. In the second step, the CdCd in the leaching solution is extracted through the replacement process to prepare Cd products to realize resource utilization.