Kinetics of Impurity Removal in Zinc Hydrometallurgy Based on Parameter Estimation Qianqian Wang, Minan Tang, Aimin An, Jiawei Lu and Yingying Zhao E3S Web Conf., 267 (2021) 02051 Published online: 04 June 2021 DOI: 10.1051/e3sconf/202126702051