TRPO流程中U的反萃 Ⅰ.反萃剂的选择

STUDY ON STRIPPING OF URANIUM IN TRPO PROCESS .SELECTION OF THE STRIPPING AGENT

研究了ＴＲＰＯ萃取流程中的Ｈ２Ｃ２Ｏ４反萃Ｎｐ、Ｐｕ段，在含Ｕ的ＴＲＰＯ相中出现沉淀的条件及消除办法。结果表明，提高洗涤段硝酸浓度，使ＴＲＰＯ相中Ｈ２Ｃ２Ｏ４与ＨＮＯ３的浓度比小于３，在该相中就不会出现沉淀。当用０．２ｍｏｌ／Ｌ或０．８ｍｏｌ／ＬＨＮＯ３洗涤ＴＲＰＯ相２次后，再用（ＮＨ４）２ＣＯ３或Ｎａ２ＣＯ３溶液反萃Ｕ时，水相也不会产生（ＮＨ４）２Ｃ２Ｏ４或Ｎａ２Ｃ２Ｏ４沉淀。

The stripping of uranium in TRPO process is studied.When the concentration ratio of H2C2O4 to HNO3 in the TRPO phase is higher than 3,the compound UO2C2O4TRPO is precipitated,but it does not affect the stripping of uranium.While C2O2-4 concentration in the Na2CO3 stripping solution is higher the Na2C2O4 crystal will be separated out.If H2C2O4 is scrubbed out from TRPO phase using 0.2 mol/L or 0.8 mol/L HNO3,the white precipitate does not occur in the stripping solution of uranium.