Process for the production of high-grade titanium dioxide by sulfate method
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United States of America Patent
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Jan 22, 1991
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N/A
app pub date -
Aug 17, 1989
filing date -
Jul 5, 1985
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Abstract
High-grade titanium dioxide is produced by (a) reacting ilmenite or titanium-containing slag with sulfuric acid, (b) dissolving the material from (a) with water or dilute sulfuric acid, (c) separating insolubles from (b) to obtain a black solution containing titanyl sulfate and foreign metal salts, extracting titanyl sulfate from the black liquor with sulfuric acid and an organic medium containing an organophosphorus compound, separating the foreign metal salts in an aqueous extract phase, recovering titanyl sulfate from the organic extract phase, and hydrolyzing the titanyl sulfate to titanium oxide hydrate.
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