| Extraction of gallium and germanium has been investigated from a complex ore with sulfuric acid-sodium thiosulfate leachants. The order of reaction as well as the overall reaction rate constant was with respect to sulfuric acid concentration, calculated. Furtheremore, the apparent activation energy and the frequency factor for gallium and germanium were calculated to be A= 1.08min^(-1)., ΔEa=4.5㎉/㏖ and A= 1.01min^(-1)., 5.2㎉/㏖, respectively. Stirring speed has no effect on the extraction rate, which suggested that this profess was chemically controlled. The influence of sodium thiosulfate on the extraction rate was found to be little significant. The rate of extraction increases with increasing temperature and decreases with increasing pulp density. Gallium and germanium extractions were realized approximately as high as 99%, and 70%, respectively. |
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