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    • 8. 发明申请
    • PROCESS FOR RECOVERING TITANIUM DIOXIDE
    • WO2021237274A1
    • 2021-12-02
    • PCT/AU2021/050460
    • 2021-05-18
    • COMMONWEALTH SCIENTIFIC AND INDUSTRIAL RESEARCH ORGANISATION
    • DAS, Goutam, Kumar
    • C22B34/12C22B3/10C22B3/22C01G23/053C01G23/047
    • A process for recovering titanium dioxide from a titanium-bearing material, the process including the steps of: leaching the titanium-bearing material in a first leaching step at atmospheric pressure and at a temperature of 70 to 97°C with a first lixiviant to produce a first leach solution comprising undissolved first leach solids that include a titanium content and a first leach liquor, the first lixiviant comprising hydrochloric acid at a concentration of less than 23 % w/w; separating the first leach liquor and the undissolved first leach solids; leaching the first leach solids in a second leaching step at atmospheric pressure and at a temperature of 60 to 80°C with a second lixiviant in the presence of a Fe powder reductant to produce a second leach solution comprising undissolved second leach solids and a second leach liquor that includes a leached titanium content and iron content, the second lixiviant comprising a mixed chloride solution comprising less than 23 % w/w hydrochloric acid and an additional chloride selected from alkali metal chlorides, magnesium chloride and calcium chloride, or mixtures thereof; separating the second leach liquor and the undissolved second leach solids; and thereafter separating the titanium dioxide and the iron content from the second leach liquor by precipitation, and regenerating the second lixiviant for recycle to the second leaching step.