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US 2006/0233686 A1Published application
Production of titania
AssigneeBHP Billiton Innovation Pty Ltd.
InventorsEric Roche, Alan Stuart, Philip Grazier
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Abstract
A sulfate process for producing titania from a titaniferous material is disclosed. The process includes leaching the titaniferous material and producing a leach liquor, separating titanyl sulfate from leach liquor, hydrolysis of the extracted titanyl sulfate, and thereafter calcining the solid phase produced in the hydrolysis step. The process is characterised by multiple stage leaching of the titaniferous material.
Claims24
A sulfate process for producing titania from a titaniferous material which includes the steps of:
- (a) leaching the solid titaniferous material with a leach solution containing sulfuric acid and forming a leach liquor that includes an acidic solution of titanyl sulfate (TiOSO4) and iron sulfate (FeSO4);
- (b) separating the leach liquor and a residual solid phase from the leach step (a);
- (c) separating titanyl sulfate from the leach liquor from step (b);
- (d) hydrolysing the separated titanyl sulfate and forming a solid phase containing hydrated titanium oxides;
- (e) separating the solid phase containing hydrated titanium oxides and a liquid phase that are produced in the hydrolysis step (d);
- and
- (f) calcining the solid phase from step (e) and forming titania;
- (g) a further leach step of leaching the residual solid phase from step (b) with a leach solution containing sulfuric acid and forming a leach liquor that includes an acidic solution of titanyl sulfate and iron sulfate and a residual solid phase;
- (h) separating the leach liquor and the residual solid phase from step (g);
- and
- (i) supplying the separated leach liquor to the leach step (a) and/or mixing the separated leach liquor with the leach liquor from step (b).
8 more elements
Dependencies are inferred from the claim text.