Process for manufacturing titanium compounds
AssigneeNL Industries, Inc.
InventorsBrian R. Davis, Joseph A. Rahm
Life of this patent
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Abstract
A process is provided for the manufacture of titanium compounds and particularly titanium dioxide wherein excess titaniferous bearing material is reacted with dilute sulfuric acid having a concentration of between about 25% and about 60% by weight at a temperature below about 140.degree. C. Thereafter, the titanium sulphate may be recovered or processed to provide titanium dioxide hydrate accompanied by recycling the spent acid for reaction with the titaniferous bearing material charged to the process. The titanium hydrate may be calcined to provide titanium dioxide pigment.
Claims16
A process for producing a titanium sulphate solution, which comprises:
- reacting
- (a) a titaniferous bearing material in an amount between about 10% and about 400% above the stoichiometric amount of titaniferous bearing material necessary to react with sulfuric acid to provide titanium sulphate, and
- (b) a dilute sulfuric acid solution having a concentration between about 25% and about 60% by weight, based upon the total weight of said solution,
- at a temperature below about 140.degree. C. in the absence of a reducing agent;
- cooling the resulting reaction mixture to a temperature below about 110.degree. C. without precipitating the reaction products to produce a reaction mixture containing titanium sulfate, and separating undissolved solids to produce a titanium sulfate solution.
A process for producing titanium dioxide which comprises (1) reacting
- (a) a titaniferous bearing material in an amount between about 10% and about 400% above the stoichiometric amount of titaniferous bearing material necessary to react with sulfuric acid to provide titanium sulphate, and
- (b) a dilute sulfuric acid solution having a concentration between about 25% and about 60% by weight, based upon the total weight of said solution,
- at a temperature below about 140.degree. C. in the absence of a reducing agent;
- (2) cooling the resulting reaction mixture to a temperature below about 110.degree. C. without precipitating the reaction products;
- (3) removing undissolved solids and iron sulfate from said reaction mixture to provide a titanium sulphate solution;
- (4) hydrolyzing said titanium sulphate solution to provide a hydrate of titanium dioxide and spent sulfuric acid solution;
- (5) calcining said hydrate of titanium dioxide to provide titanium dioxide and (6) recovering the titanium dioxide.
A continuous process for producing titanium dioxide which comprises:
- (1) continuously reacting (a) a titaniferous bearing material in an amount between about 10% and about 400% above the stoichiometric amount of titaniferous bearing material necessary to react with sulfuric acid to provide titanium sulphate, and (b) a dilute sulfuric acid solution having a concentration between about 25% and about 60% by weight, based upon the total weight of said solution, at a temperature below about 140.degree. C. in the absence of a reducing agent;
- (2) cooling the resulting reaction mixture to a temperature below about 110.degree. C. in a second reaction vessel without precipitating the reaction products while continuing the reaction;
- (3) separating unreacted titaniferous bearing material from the reaction mixture to provide a solution of iron sulphate and titanium sulphate;
- (4) removing iron sulphate from said solution of iron sulphate and titanium sulphate to provide a solution of titanium sulphate;
- (5) hydrolyzing said titanium sulphate solution from (4) to provide a titanium dioxide hydrate, and spent sulfuric acid solution;
- (6) calcining said titanium dioxide hydrate to provide titanium dioxide and
- (7) recovering titanium dioxide.
Dependencies are inferred from the claim text.