海水ウラン採取工程中のウランのイオン状態

抄録

The ionic state of uranium in the extraction process of uranium from seawater was estimated from the equilibrium relations. Uranium existed mainly in the cationic state such as UO₂²⁺ or UO₂Cl₂⁺ in hydrochloric acid solution and in the anionic state such as UO₂ (SO₄) ₃^4- in sulfuric acid solution. In carbonate solution or sodium chloride solution containing carbonate, uranium existed in the anionic state such as UO₂ (CO₃) ₃^4-. In the carbonate-free solution of sodium chloride, however, UO₂OH₃^- was predominant. The ionic state in the mixture of hydrochloric acid and sulfuric acid was complex. In this case, such cationic ions as UO₂²⁺ or UO₂SO₄⁰ was predominant in 0.1 N solution, and such ion as UO₂ (SO₄) ₃^4- was predominant in 1.0 N solution.