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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_2O_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_4NO_33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
Preface naphthenic acid extraction of rare earth elements, early 60s and Bauer et al were studied [1,2]. Since the seventies, great progress has been made [3-9]. In 1974, the separation of yttrium from non-yttrium rare earth elements was studied in China. Y_2O_3 with a purity of 99.99% was obtained by one-step extraction and separation. The process has been successfully used in industrial production [10]. Lanthanum, yttrium and other rare earth elements naphthenic acid extraction and separation also made good progress [11-13]. In the naphthenic acid extraction system, the separation factor between adjacent rare earth elements is generally not large, between 0.3-1.3 [14-15], salting-out agent [16] or ammonia-carboxy complexing agent [2] can improve the separation conditions. When the aqueous phase added salting agent - NH_4NO_33, some of the adjacent rare earth elements appear distribution coefficient decreased with the atomic number of rare earth elements down