Abstract
ABSTRACTUranium is normally leached from its ores with sulfuric acid, separated from impurities using solvent extraction or ion exchange, and precipitated to yield a commercial product known as “yellow cake.” This research has investigated the use of sodium chloride and potassium iodide with the sulfuric acid leach to recover the uranium, mercury and cesium from the cemented waste. Sulfuric leaching using KI improves the solubilization of Hg by a combination of acidification, complexation, and oxidation and form a mercury tetraiodide complex. Mercury and cesium were recovered selectively using thiourea resin and solid potassium cobalt hexacyanoferrate respectively with removal efficiencies reaching 99%. The U recovery from sulfuric liquor using the chelating resin Lewatit TP260 is very efficient. The loading curve for U recovery in iodide media shows a better uptake than in chloride media and the resulting breakthrough is delayed. High purity yellow cake was obtained by precipitation as sodium diuranate.
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