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$developments in the processing of refractory & complex gold ores$

THE USE OF AMMONIUM CARBONATE AS LIXIVIANT IN URANIUM LEACHING By 1 B Kweto, 1 DR Groot, 2 L Stassen, 2 J Suthiram & 3 JR Zeevaart 1 University of Pretoria, South Africa 2 Necsa (South African Nuclear Energy Corporation) 3 CARST, North-West University, South Africa Presenter and Corresponding Author Dick Groot dick.groot@up.ac.za ABSTRACT Ammonium carbonate is not commonly used in industrial uranium leaching, although it has benefits such as selectivity, little or no attack on silicaceous materials, good opportunities for reagent recycling, and straightforward and selective recovery of uranium values. It has found application in in-situ leaching, however. When radioactive materials are handled in hot cells, it is desirable to have the simplest possible process resulting in no or minimal waste. Ammonium carbonate as lixiviant was studied for the selective recovery of uranium from a simulated residue for eventual application in the recovery of uranium from radioactive residues. The study also compared oxygen and hydrogen peroxide as oxidants. It was found that the leaching reaction is rapid at 50 °C and above, especially when hydrogen peroxide is used as lixiviant. The reagent decomposes to ammonia, carbon dioxide, and water at rather low temperatures. This can, however, be put to good effect by allowing simple recovery of the reagent, thus closing possible effluent loops and minimizing wastes, with attendant environmental benefits. The conditions for obtaining an easily filtered product were determined. 139
<strong>ALTA</strong> 2012 URANIUM CONFERENCE PROJECT DEVELOPMENT 150
Page 1 and 2: ALTA 2012 URANIUM CONFERENCE MAY 31
Page 3 and 4: CONTENTS SX/IX Comparison of Variou
Page 5 and 6: ALTA 2012 URANIUM CONFERENCE SX/IX
Page 7 and 8: SOLVENT EXTRACTION OF URANIUM AND I
Page 9 and 10: STRONG ACID VERSUS AMMONIA STRIP IN
Page 11 and 12: APPLICATION OF WINTRAY EXTRACTION C
Page 13 and 14: 105
Page 15: ALTA 2012 URANIUM CONFERENCE URANIU
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Page 21 and 22: ENVIRONMENTAL ASPECTS OF URANIUM PR
Page 23 and 24: ALTA 2012 URANIUM CONFERENCE URANIU
Page 25 and 26: THE CRITICAL ROLE OF GANGUE ELEMENT
Page 27 and 28: EARLY STAGE METALLURGICAL EVALUATIO
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Contents & Abstracts - ALTA Metallurgical Services

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