Abstract
The present study is the investigation of the kinetics of uranium extraction from a low-grade ore using a mixed Na 2CO 3-NaHCO 3 leachant at various air pressures from one to 68 atmospheres and temperatures ranging from 29 to 70°C. The yield and rate of uranium extraction were found to increase as a function of temperature and pressure. The highest uranium extraction was 61% at atmospheric pressure and 96.9% at ten atmospheres both after 4 h of leaching at 70°C. The activation energy was determined to be 3.86 and 3.45 kcal mole −1 at one and 10 atmospheres, respectively. The order of uranium extraction was determined to be 0.31 with respect to the oxygen partial pressure. The surface characteristics of the low-grade uranium ore and the leach residues have been characterized by scanning electron microscopic techniques.
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