| 摘要 |
<p>A process for refining titania-containing ores is described based on the increased reactivity of lower valent titanium oxides over tetravalent titanium oxides. The process includes the conversion of such titania ores, preferably beneficiated, to lower valent titanium oxides by reduction at elevated temperatures, extraction of the lower valent titanium values with HCl, oxidation of the extracted titanium values to tetravalent titanium compounds and recovery of purified TiO2 from the tetravalent titanium compounds. The residue left after the extraction step may be returned to the conversion step for reduction of residual tetravalent titanium values. Traces of fluorine or hydrofluoric acid have been found to catalyze the reaction.</p> |
