1. School of Metallurgy and Environment, Central South University, South Lushan Road, Changsha, Hunan Province 410083, China
2. College of Chemistry and Chemical Engineering, Central South University, South Lushan Road, Changsha, Hunan Province 410083, China
3. Hydrometallurgy and Corrosion, Department of Chemical and Metallurgical Engineering (CMET), School of Chemical Engineering, Aalto University, 02150 Espoo, Finland