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本文研究了α-氯己酸对La~(3+)、Nd~(3+)、Sm~(3+)、Y~(3+),及Fe~(3+)的萃取。结果表明,己酸经α单氯取代后,对所研究的稀土元素的半萃pH下降约一个单位,可萃取pH范围明显加宽。在相同条件下,α-氯己酸和己酸对上述离子的萃取顺序相同,即Fe~(3+)>Sm~(3+)>Nd~(3+)>La~(3+)>Y~(3+)。α-氯己酸可在更低的pH下实现钇(或铁)与其他稀土元素的分离,并能防止金属离子水解,克服乳化。由饱和萃取法测得两种萃取剂与Nd~(3+)的萃合物组成相同,在pH为4.3和6.3时,分别为NdA_3·3HA和NdA_3。
In this paper, the extraction of La ~ (3 +), Nd ~ (3 +), Sm ~ (3 +), Y ~ (3+) and Fe ~ (3+) by a- The results showed that the half-extraction pH of hexenoic acid decreased by about one unit after substitution of hexanoic acid with α-monochloride, and the range of extractable pH was widened significantly. Under the same conditions, α-chlorohexanoic acid and hexanoic acid have the same order of extraction for the above ions, ie, Fe 3+ Sm 3+ Nd 3+> La 3+> Y ~ (3+). Alpha-chlorohexanoic acid enables the separation of yttrium (or iron) from other rare earths at lower pHs and prevents hydrolysis of metal ions to overcome emulsification. The extractants of the two extracts were found to be identical in composition to the Nd 3+ extracts by saturation extraction and NdA 3 · 3HA and NdA 3 at pH 4.3 and 6.3, respectively.