STRIPPING OF URANIUM FROM D2EHPA/TOPO SOLVENT BY AMMONIUM CARBONATE SOLUTIONS
2002
Uranium is recovered from phosphoric acid by the D2EHPA/TOPO
process. In
this process uranium is stripped from the loaded D2EHPA /TOPO solvent in the
second cycle by an ammonium carbonate solution.
This paper studied stripping of uranium from 0.3 mol/L D2EHPA / 0.075 mol/L
TOPO in kerosene by different ammonium carbonate solutions. The ammonium
carbonate solutions tested were either prepared locally from ammonia and
carbon dioxide gases or commercial and laboratory grades available on the
market. A comparison was made between these carbonate solutions in terms of
purity, stripping efficiency and phase separation. Both stripping and
phase separation were carried out under different conditions of phase ratios
and concentrations.
The results obtained showed that ammonium carbonate prepared from direct
reaction of ammonia and carbon dioxide gases had a high purity and gave the
same stripping yield as the laboratory grade. The phase separation was also
slightly improved using a pure synthesized ammonium carbonate solution. The
phase separation was found to be the best at a concentration of 0.5 mol/L
ammonium
carbonate solution and at a phase ratio A/O of 1/1 and a temperature of
50 ° C. It was possible to obtain > 99 \% yield of uranium by
operating 2 stripping stages counter-currently under these conditions.
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