用5601萃取剂从氯化稀土溶液中分离铀和钍

SEPARATING URANIUM AND THORIUM FROM RARE-EARTH CHLORIDES SOLUTIONS BY HD(DIBM)P

本文研究了用二(二异丁基甲基)磷酸(代号为5601)从氯化稀土溶液中分离少量铀和钍的各种影响因素,提出了分离这些金属的方案和参数。

Separation of uranium and thorium from the rare-earth chlorides solutions by solvent extraction has been studied. The experimental results show that the uranium and/or the thorium in lower concentration can be separated from the rare-earth chlorides in higher concentration by a mixture of di-(diisobutylmethyl) phosphoric acid [HD(DIBM)P] and trialkylphosphine oxide (TRPO) in kerosene. The distribution ratios of uranium and thorium are 206 and 13.9 respectively and the separation factors of uranium and thorium to rare-earth chlorides are 5.7×106 and 3.9×104 respectively in the single-stage extraction at the phase ratio (organic:aqueous) 1:1 from the chloride solutions containing uranium (1 g/1), thorium (1 g/1) and rare-earths (RE2O3,100 g/1) with 0.1M HD(DIBM)P-0.05M TRPO in kerosene. The uranium and thorium can be effectively removed from the rare-earth chlorides in the counter-current extraction at the phase ratio (organic:aqueous) 1:4.