1. School of Metallurgy, Northeastern University, Shengyang, PR China
2. CAS Key Laboratory of Green Process and Engineering, National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, PR China
3. University of Chinese Academy of Sciences, Beijing, PR China
4. HBIS Group, Shijiazhuang, PR China
5. Hebei Vanadium-Titanium Industrial Technology Research Institute, HBIS Group, Chengde, PR China