EXTRACTION MECHANISM OF RARE EARTH ELEMENTS(Ⅲ),IRON(Ⅲ)AND THORIUM(Ⅳ)FROM SULFURIC ACID SOLUTIONS BY PRIMARY AMINE N 1923
Li Deqian, Ji Enrai, Xu Wen, Yu Dingyu, Zeng Guangfu, Ni Jiazuan
Chinese Journal of Applied Chemistry . 1987, (2): 36 -41 .