Production of acid soluble titania
Patent 5411719 Issued on May 2, 1995. Estimated Expiration Date: 
September 24, 2013. 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.
September 24, 2013. 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 2954278 3502460 Preparation of pure titanium dioxide with anatase crystal structure from titanium oxychloride solution Patent #: 4923682 InventorsApplicationNo. 127296 filed on 09/24/1993US Classes:423/69, Group IVB metal (Ti, Zr, or Hf)423/80, Chemically converting for physical solid-solid separation423/83, Forming metallic iron or insoluble iron containing compound423/85Forming insoluble compound containing Group IVB metalExaminersPrimary: Brunsman, DavidAttorney, Agent or FirmForeign Patent References
International ClassesC22B 001/02C01G 023/047 C01G 023/08 Foreign Application Priority Data1989-05-11 AUAbstractAccordingly the present invention provides a process for producing acid soluble titania which process comprises the steps of:(i) adding a manganese or magnesium compound to a titaniferous mineral if the mineral does not contain sufficient manganese and magnesium to satisfy the following relationship: ##EQU1## where a represents the percentage by weight of MgO contained in the mineral,b represents the percentage by weight of MnO contained in the mineral, andd represents the percentage by weight of TiO2 contained in the mineral;(ii) heating the titaniferous mineral in the presence of a reductant at a temperature and for a time sufficient to permit contained iron to be reduced to its metallic form and contained titania to convert to an acid soluble form without significant accretion of the mineral occurring;(iii) cooling the product of step (ii); and(iv) subjecting the product of step (iii) to an aqueous chemical treatment to substantially remove iron from the mineralwherein the manganese or magnesium compound is an oxide or is capable of decomposing to an oxide under reaction conditions.Other References
Field of SearchGroup IVB metal (Ti, Zr, or Hf)Chemically converting for physical solid-solid separation Forming metallic iron or insoluble iron containing compound Forming insoluble compound containing Group IVB metal Iron group metal (Fe, Co, or Ni) Converting metal to magnetic form Liquid-liquid extracting Titanium dioxide Utilizing titanium halide as reactant |
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