Method for purifying TiO.sub.2 ore
AssigneeE. I. Du Pont de Nemours and Company
InventorsTze Chao, George H. Senkler, Jr.
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Abstract
Process for purifying TiO.sub.2 ore consisting essentially of subjecting the ore to two or more leaching treatments, said leaching treatments alternating between use of an aqueous solution of a mineral acid and an aqueous solution of an alkali metal compound selected from the group consisting essentially of alkali metal carbonates, hydroxides or mixtures thereof.
Claims26
Process for purifying TiO.sub.2 ore containing impurities of iron, alkali metal, alkaline earth metal, rare earth metal, aluminum, phosphorus, thorium, uranium, chromium, manganese, silicon, vanadium, and yttrium, said process consisting essentially of subjecting the ore to two or more leaching treatments, said leaching treatment:
- (a) alternating between use of an aqueous solution of a mineral acid and an aqueous solution of an alkali metal compound selected from the group consisting essentially of alkali metal carbonates, hydroxides or mixtures thereof, and wherein the treatment with a mineral acid occurs first, and
- (b) being conducted at a temperature, pressure, and time, and with an amount and concentration of an aqueous solution of a mineral acid and an aqueous solution of an alkali metal compound, which are sufficient to solubilize substantially the iron, alkali metal, alkaline earth metal, rare earth metal, aluminum, phosphorus, thorium, uranium, chromium, manganese, silicon, vanadium, and yttrium impurities present to form a leachate, and wherein the leachate formed is removed prior to the next leaching treatment.
Dependencies are inferred from the claim text.