作者单位:MA Jian,ZHU Pei-feng(Hebei Steel and iron limited company Chengde Subsidiary company Heishan chooses the titanium factory, Chengde 067412, China)马建,朱培凤(河北钢铁股份有限公司承德分公司黑山选钛厂,河北承德067412)MIAO Li-hong,JIANG Jian-guo(Hebei steel and iron group mining industry limited Company Chengde Heishan Iron Ore,Chengde 067412, China)苗立宏,江建国(河北钢铁集团矿业有限公司承德黑山铁矿,河北承德067412)