作者单位: | WANG Wenmei Baotou Research Institute of Rare Earth,Ministry of Metallurgy Industry,Baotou,ChinaYU Yongfu CHEN Quanyuan Changsha Institute of Mining and Metallurgy,Ministry of Metallurgy Industry,Changsha,China engineer,Baotou Research Institute of Rare Earth,Ministry of Metallurgical Industry,Baotou 014010,China |