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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，保证萃取过程正常进行
The conditions for the precipitation of H2C2O4 and the removal of Np and Pu in the TRPO extraction process and the precipitation in the TRPO phase containing U were investigated. The results show that increasing the concentration of nitric acid in the washing stage results in a concentration ratio of H2C2O4 to HNO3 in the TRPO phase of less than 3, and precipitation does not occur in the phase. When the TRPO phase is washed twice with 0.2mol / L or 0.8mol / L HNO3 and then with (NH4) 2CO3 or Na2CO3, the aqueous phase will not produce (NH4) 2C2O4 or Na2C2O4 precipitation, ensuring the extraction The process is working