Abstract
For obtaining higher productivity for the leaching of ilmenite ore by sulfuric acid, the effect of pre-oxidation and reduction was examined experimentally. In the leaching of reduced ilmenite ore, dissolution rate of reduced iron was extremely larger than that of undisposal ore, however, titanium was scarcely dissolved in the period of the iron-dissolution. As the results, enriched titanium dioxide was remained in the residue leached from ilmenite ore in a short time. This phenomenon enhanced under the conditions of higher leaching temperature, lower concentration of sulfuric acid, higher reduction degree and smaller particle size of ilmenite ore. On the basis of the result mentioned above, a process for recovery of titanium dioxide from leached residue was proposed as a new leaching technology of ilmenite ore.
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