提高钍萃取率和反萃取率的研究

用Ｐ３５０为萃取剂，对萃余水相（钍渣盐酸分解液经ＴＢＰ萃取铀、铁后的溶液）中的钍进行了提高萃取率和反萃取率的研究。结果表明，在萃取料液中补加适量ＨＮＯ＿３，增加ＮＨ＿４ＮＯ＿３用量，可大幅度提高钍的萃取率；加适量氨水于水中作反萃取剂，可提高钍的反萃取率。

INVESTIGATION ON IMPROVING EXTRACTION AND STRIPPING RATES OF THORIUM

This paper presents the investigative results about improving on extraction and strippingrates of thorium taking P350 as an extractant in the raff mates which are obtained fromdigested liquid of thorium residues by hydrochloric acid after uranium and iron have beenextracted. The results show that it can enhance greatly the extraction rate of thorium addingappropriate amount of HNO_3 and increasing use quantity of NH_4NO_3 into extracted feedsolution,and it can raise the stripping rate of thorium adding an amount of ammonia intowater serving as a strippant.