Method for purifying TiO2 ore
Patent 5011666 Issued on April 30, 1991. Estimated Expiration Date: 
July 28, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
July 28, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2941863 3069235 3816099 3856512 3919388 Upgrading sorelslag for production of synthetic rutile Process for concentration of titanium containing anatase ore Process for preparation of raw material minimizing the size degradation of anatase ore Process of removing iron impurities from ores Process for preparing a pigmentary titanium dioxide InventorsAssigneeApplicationNo. 225431 filed on 07/28/1988US Classes:423/82, Treating with sulfur or halogen containing acid423/21.1, Rare earth metal (At. No. 21, 39, or 57-71)423/49, Group VIIB metal (Mn, Tc, or Re)423/84, Treating with compound containing alkali metal or alkaline earth metal423/86, Dissolving or leaching of iron423/139Ion exchanging or liquid-liquid extractingExaminersPrimary: Morris, TheodoreAssistant: Squillante, Edward Foreign Patent References
International ClassC22B 034/10AbstractProcess for purifying TiO2 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.Field of SearchChemically converting for physical solid-solid separationTreating with nitrogen or nitrogenous compound Treating with sulfur or halogen containing acid Treating with compound containing alkali metal or alkaline earth metal Ion exchanging or liquid-liquid extracting Ion exchanging or liquid-liquid extracting Ion exchanging or liquid-liquid extracting Group VA metal or arsenic (Sb, Bi, or As) Ion exchanging or liquid-liquid extracting Ion exchanging or liquid-liquid extracting Group VIIB metal (Mn, Tc, or Re) |
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