Abstract
Two stage processing – acid leaching and carbochlorination – is proposed for titanium extraction from titanite (CaTiSiO5). Calcium oxide and 40–60wt.% of titanium oxide in titanite were dissolved by leaching in recyclable hydrobromic acid. Titanium dioxide of 99.5wt.% purity was obtained by thermal hydrolysis of titanium containing acid solution. On the second stage, solid leaching residue was carbochlorinated at 1100°С in a rotary tube furnace to produce titanium tetrachloride. An overall titanium extraction of 93.7% was obtained. Pyrohydrolysis of CaBr2 at 1100–1200°С was used for the hydrobromic acid recycling.
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