Comparison of utility in chemical process for extractants and masking agents developed in JAEA

Sasaki, Yuji  ; Ban, Yasutoshi  

JAEA has developed DGA compounds for total recovery of Ln+An, MIDOA (methylimino-dioctylacetamide) and NTAamide (nitrilotriacetamide) for extractions of Mo, Tc and Pd, ADAAM (alkyldiamide amine) for Am/Cm separation, and those extractants are considered to be outstanding in the world. However, some of the prominent reagents are examined in the same separation purpose, so it is difficult to select the suitable reagents. In this work, we evaluated the utilities of extractants and masking agents taking into account the linkage among three processes and the concentrations of metal ions in high-level radioactive waste. Thus, conditions of extraction process for total recovery of Ln+An using several DGA compounds and DOODA (dioxaoctanediamide), Ln/An separation process using NTAamide and DTBA, and Am/Cm separation process using ADAAM and DGA/DOODA are compared. Following the results in this work, the simple and effective separation scheme is investigated.