Abstract
The extraction of trivalent rare earth ions (RE3+) from HNO3 solution using a triamide amine, tris(N,N-di-2-ethylhexyl-ethylamide)amine (DEHTAA), was conducted, and the extraction mechanism was estimated from extraction behavior of HNO3 and RE3+. A DEHTAA molecule dominantly formed a DEHTAA⸱HNO3 at 1.0 M HNO3 and a DEHTAA⸱(HNO3)2 at 6.0 M HNO3 in the acid-equilibrated organic phase. This would provide the unique dependence of E% for the light RE3+ on the HNO3 concentration, in which the E% value had a minimum and maximum at ~0.5 M and ~2 M HNO3, respectively. The results of the slope analyses for the distribution ratios for RE3+ suggested that the dominant RE3+ complex was RE(NO3)3DEHTAA(DEHTAA⸱HNO3) at 1.0 M HNO3. The E% for RE3+ decreased from La3+ to Lu3+ at 1.0 M HNO3; however, those increased from La3+ to Nd3+ at 0.25 M HNO3 and from La3+ to Sm3+ at 6.0 M HNO3.
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