1. School of Metallurgy and Environment, Central South University, Changsha, Hunan 410083, China
2. National Engineering Laboratory for High Efficiency Recovery of Refractory Nonferrous Metals, Changsha, Hunan 410083, China
3. School of Mechanical and Materials Engineering, Washington State University, Pullman, Washington 99164, United States
4. College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China