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Report No.

Study of an aqueous process using hydrochloric acid for radioactive waste containing uranium

Ohashi, Yusuke ; Tsunashima, Yasumichi; Murata, Masato

Solid and liquid radioactive waste derived from various research such as technology development for uranium refining and conversion stored currently totals 1500tons. NaF waste, used as an absorbent of UF$$_{6}$$ contains about 20-30wt% uranium. CaF$$_{2}$$ waste, which is generated from the disposal of waste water including fluoride, contains up to 20wt% uranium. Most of these are classified as intermediate disposal waste. Hence it is necessary to recover uranium to dispose waste as a shallow ground disposal waste. Dissolution experiments were carried out by charging CaF$$_{2}$$ waste and NaF waste into 1N HCl. The dissolution rates of CaF$$_{2}$$ waste and NaF waste were 99.8% and 100% respectively. The recovery rates of uranium from CaF$$_{2}$$ solution and NaF solution were 98.2% and 99.7% respectively. It was confirmed that we could dispose these waste reasonably.



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