^1.School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, Inner Mongolia, China

^2.Key Laboratory of Integrated Exploitation of Bayan Obo Multi-Metal Resources, Inner Mongolia University of Science and Technology, Baotou 014010, Inner Mongolia, China

^3.Provincial and Ministerial Co-founded Collaborative Innovation Center for Comprehensive and Efficient Exploitation of Bayan-Obo Associated Ore Resources, Inner Mongolia University of Science and Technology, Baotou 014010, Inner Mongolia, China

^4.National & Local Joint Engineering Research Center for Comprehensive Utilization of Discarded Resources of Bayan-Obo Associated Ore, Inner Mongolia University of Science and Technology, Baotou 014010, Inner Mongolia, China