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The oxidation of UC powder was studied in 0.5–6.0 M HNO 3  and HClO 4 , containing 0.01–0.1 M NaNO 2 , at ambient temperature. The addition of nitrous acid caused the oxidation potential to exceed 400 mV/SCE and thus accelerated the dissolution and increased the dissolution yield to exceed 95%. One hundred percent dissolution at room temperature was achieved within 30 to 40 min when 3.0–6.0 M HNO 3  was used that contained more than 0.005 M HNO 2 .The dissolution rate increased with increasing HNO 3  concentration and initial solid-to-liquid ratio. The effective dissolution rate constants and reaction orders were estimated for the UC oxidation with H + , NO 3  -  and HNO 2  in 0.5–6.0 M HClO 4 . The rate of UC oxidation with HNO 2  exceeded 50–80 times its oxidation rates with NO 3  -  ions. During UC oxidation with HNO 2  in 0.5–6.0 M HClO 4 , 60–85% carbon was oxidized to CO 2 . The C/U(VI) ratio in the dissolver solution decreased from 0.5 to 0.1 mg eq/mol with increasing of HClO 4  and HNO 2  solution concentration. Two to five percent of the carbon remained in the insoluble residue of the HNO 3  dissolver solutions, even when a 100% U(VI) yield was observed. Scanning electron microscopy of the insoluble residue showed the carbon particle size between 1.0 and 5.0 μm.

UC oxidation with HNO 2 in aqueous solutions of HNO 3 and HClO 4