ApplicationNo. 450853 filed on 03/13/1974
US Classes:423/74, Utilizing fluidized bed423/148, Utilizing fluidized bed423/149, Volatizing iron, nickel, or cobalt423/610Titanium dioxide
ExaminersPrimary: Stern, Edward
Attorney, Agent or Firm
Foreign Application Priority Data1973-03-16 JA
AbstractArtificial 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.