1. Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, P. R. China
2. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, P. R. China
3. No. 2 Steelmaking Steel Plant, Shanxi Taigang Stainless Steel Corporation Limited, Taiyuan 030003, P. R. China