Chlorine treatment of titaniferous ores
Patent 3950489 Issued on April 13, 1976. Estimated Expiration Date: 
April 13, 1993. 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.
April 13, 1993. 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 2183365 2961298 3112178 3291599 3428427 3446590 3457037 3699206 3784670 3803287 InventorAssigneeApplicationNo. 450853 filed on 03/13/1974US Classes:423/74, Utilizing fluidized bed423/148, Utilizing fluidized bed423/149, Volatizing iron, nickel, or cobalt423/610Titanium dioxideExaminersPrimary: Stern, EdwardAttorney, Agent or FirmForeign Application Priority Data1973-03-16 JAAbstractArtificial rutile of high TiO2 grade is produced by chlorine treatment of titaniferous ore such as ilmenite which comprises a combination of (1) a pretreatment step in which the ore is oxidized by roasting at a temperature below the sintering temperature thereof thereby to activate the ore, (2) a chloridization step in which the pretreated ore is subjected to a chlorine treatment in a fluidized bed chloridization furnace thereby to chloridize and remove selectively iron oxides within the ore without the formation of TiCl4, and (3) an aftertreatment step which comprises subjecting the ore to magnetic separation with a magnetic field of at least 20,000 gauses and further treatments thereafter, as necessary, such as a wet table treatment and electrostatic separation at from 5,000 to 30,000 volts. |
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