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US 4,137,292 AGranted
Purification of titanium trichloride
AssigneeUop LLC
InventorWilliam K. Tolley
Life of this patent
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Abstract
Titanium trichloride which is obtained during one step of a process for recovering titanium metal values from a titanium bearing source which still contains some impurities such as iron and vanadium compounds may be purified by drying the titanium compound in an air atmosphere, further drying under a carbon monoxide atmosphere and thereafter roasting the dried compound in the presence of chlorine at an elevated temperature to separate the impurities from the desired titanium compounds.
Claims1
A process for purifying titanium trichloride and recovering titanium dioxide and titanium tetrachloride which comprises the steps of:
- (a) drying said titanium trichloride in an air atmosphere at a temperature below about 100.degree. C;
- (b) further drying said titanium trichloride in a carbon monoxide atmosphere at an elevated temperature in the range of from about 250.degree. to about 750.degree. C.;
- (c) roasting the dried titanium trichloride for about 0.5 to about 2 hours at an elevated temperature in the range of from about 400.degree. to about 750.degree. C in the presence of carbon monoxide and chlorine;
- (d) separating the volatile impurities;
- and
- (e) recovering purified titanium dioxide and titanium tetrachloride.
3 more elements
Dependencies are inferred from the claim text.