环烷酸萃取稀土元素的研究（一）——NH₄NO₃、EDTA铵盐在稀土萃取过程中的应用

环烷酸萃取稀土元素的研究（一）——NH 4 NO 3 、EDTA铵盐在稀土萃取过程中的应用 THE STUDY OF EXTRAC1TON OF RARE EARTHS BY MEANS OF NAPHTHENIC ACID（Ⅰ） 庞伦 first-author 席美云 庞静 吴爱清 黄金雄 陈翠云 < 正 > 前言环烷酸萃取稀土元素,六十年代初和Bauer等进行了研究[1,2]。七十年代以来,取得很大进展[3-9] 。一九七四年,国内研究了它对钇与非钇稀土元素间的分离,采用一步萃取分离法获得纯度为99.99%的Y 2 O 3 ,该工艺已成功地用于工业生产[10]。镧、钇和其它稀土元素的环烷酸萃取分离也取得良好的进展[11-13] 。在环烷酸萃取体系中,相邻稀土元素间的分离因数,一般说来是不大的,在0.3—1.3之间[14-15],加入盐析剂[16] 或氨羧络合剂[2]可以改善分离条件。当水相加入盐析剂——NH 4 NO 3 3后,某些相邻稀土元素出现了分配系数随稀土元素原子序数增加而下降的"倒 Naphthenic acid（apprent molecular Weight 253）disslve in Kerosene isused as extraction of rare earch ions from nitrate solutions, Partition eguilirium of rare earths ions is stuied in the presence of salting-out agent （NH 4 NO 3 ） and aminopolyatic acid Complex agents（EDTA—NH 3 ）. The partition of RE（0.1M）between agueous phase and solution of naphthenic acid in Kerosene（0.5M）is achieved at 25℃, After adding NH 4 NO 3 to aqueous phase, "the reverse order" phenomenon ofextraction of some adjacent RE’s elements （for example: La—Ce、Pr—Nd、Gd—Tb and Dy—Ho et al）can be observed. When EDTA is added to agueous phase（EDTA—NH 3 /RE 2 O 3 =0.4） in the presence of NH 4 NO 3 （6.0M）the separation factor of adjacent RE’s elements is increased(for example: β La/Ce =3.48, β Gd/Tb =4.60 and β Dy/HO =3.62 et al.), This increase is Called "pushpull", Therefore, in the Case of adding a Considerable quontity of EDTA—NH 3 to agueous be observed obuiously. 1981-01-01 2021-04-01 1