Abstract
The dependence of Th recovery on hydrofluoric acid (HF) concentration in nitric acid (HNO 3) solutions (1–5 mol/dm 3) containing 1 × 10 −6 mol/dm 3 of Th and various concentrations of HF and the elution behavior were studied using a commercially available UTEVA (for uranium and tetra valent actinide) resin column. Thorium recovery decreased with an increase in HF concentration in the sample solutions. The concentration of HF at which Th recovery started to decrease was ∼1 × 10 −4 mol/dm 3 in 1 mol/dm 3 HNO 3 solution, ∼1 × 10 −3 mol/dm 3 in 3 mol/dm 3 HNO 3 solution, and ∼1 × 10 −2 mol/dm 3 in 5 mol/dm 3 HNO 3 solution. When Al(NO 3) 3 (0.2 mol/dm 3) or Fe(NO 3) 3 (0.6 mol/dm 3) was added as a masking agent for F − to the Th solution containing 1 × 10 −1 mol/dm 3 HF and 1 mol/dm 3 HNO 3, Th recovery improved from 1.4 ± 0.3% to 95 ± 5% or 93 ± 3%. Effective extraction of Th using UTEVA resin was achieved by selecting the concentration of HNO 3 and/or adding masking agents such as Al(NO 3) 3 according to the concentration of HF in the sample solution.
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