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Development of treatment processes of uranium contaminated wastes using adsorbent with high selectivity to uranium, 1; Dissolution behavior of sludge containing uranium into inorganic acid

Ohashi, Yusuke ; Harada, Masayuki*; Asanuma, Noriko*; Ikeda, Yasuhisa*

Solid and liquid radioactive waste derived from research and development for uranium refining and conversion has been stored at the Japan Atomic Energy Agency Ningyo-toge Environmental Engineering Center. The solid waste with uranium totals 1500ton.Most of this waste is considered to exceed the radioactivity level for VLLW. Hence we have proposed to recover uranium using adsorbent with high selectivity to uranium after dissolving sludge into inorganic acid. Dissolution experiments were carried out by adding each sludge sample into 1N hydrochloric acid as changing dissolution time. 90% of Uranium in calcium fluoride sludge dissolved within 10 minutes. Calcium fluoride itself didn't dissolved completely. Main component of active alumina adsorbent dissolved slowly though uranium in active alumina adsorbent dissolved completely within 10 minutes. Main component of sodium fluoride adsorbent and uranium in it dissolved completely within 10 minutes.

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