美国道化学公司研究了用 Ca-Mg 合金还原稀土金属盐的一种还原工艺,其过程是:先将稀土金属盐熔化,再用熔融的 Ca-Mg 合金还原,从而得到一种熔融的钙盐和一种熔融的 Mg-M合金,将此产物机械分离出钙盐。Mg-M 熔体与铁合金化,并除去其中的镁,所得到的 Fe-M 合金适合于磁铁生产.对钕的卤化物(特别是NdCl_3)而言,还原温度为800～900℃,还原剂是Mg-(10～50%)Ca 合金。在整个工艺中镁可循环 Dow Chemical Company studied the use of Ca-Mg alloy rare earth metal reduction of a reduction process, the process is: first rare earth metal salt melting, and then molten Ca-Mg alloy reduction, resulting in a molten calcium salt And a molten Mg-M alloy, which is mechanically separated from the calcium salt. The Mg-M melt is alloyed with iron and the magnesium is removed, and the resulting Fe-M alloy is suitable for magnet production. For neodymium halides (especially NdCl 3) the reduction temperature is 800-900 ° C, the reducing agent Is Mg- (10-50%) Ca alloy. Magnesium can be recycled throughout the process