A novel approach for preferential recovery of Sr from (Sr, Th)O2.

Journal of hazardous materials (2012-10-23)
Chirag K Vyas, Pranav M Joshirao, Rakesh Shukla, Avesh K Tyagi, Vijay K Manchanda

Quantitative leaching of Sr from homogeneous and calcined (Th,Sr) O(2) in dilute perchloric acid medium suggests the possibility of reducing the hazardousness of discharged nuclear fuel by separation of (90)Sr, a prominent fission product at dissolution stage itself rather than the conventional approach of its recovery from high level nuclear waste. Apart from mitigating the radiotoxicity of the nuclear waste, recovered (90)Sr can be employed as a compact heat source and as parent radionuclide for (90)Y (used in therapy radiopharmaceuticals), provided it can be made available at desired high purity. Leaching behavior of few other fission products was also investigated to quantify their contamination in leached Sr. Feasibility of employing extraction chromatography using Sr selective resin was explored in perchloric acid medium. In this context, the distribution coefficients of (85)Sr(II), Th (IV), Zr(IV), Y(III), Pd(II) as well as (152)Eu(III) and (137)Cs (I) were determined under varying nitric acid/perchloric acid concentration and under varying loading conditions of metal ions. Perchloric acid medium appears better than nitric acid medium for preferential leaching of Sr from (Th,Sr)O(2) as well as for uptake of Sr by Sr selective chromatographic resin.

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Nitric acid, 70%, purified by redistillation, ≥99.999% trace metals basis
Nitric acid, ACS reagent, 70%
Nitric acid, puriss. p.a., 65.0-67.0%
Nitric acid, puriss. p.a., ≥65% (T)
Nitric acid, puriss. p.a., reag. ISO, reag. Ph. Eur., for determinations with dithizone, ≥65%
Nitric acid, red, fuming, HNO3 >90 %
Nitric acid concentrate, 0.1 M HNO3 in water (0.1N), eluent concentrate for IC
Nitric acid, ACS reagent, ≥90.0%