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Production of High-purity Synthetic Rutile from a Domestic Ilmenite Concentrate.
NTIS: PB 203 891 :10 pages
A new process under development by the Bureau of Mines for producing synthetic rutile from ilmenite is described. Rutile formation is based on oxidation and fluxing of titania slag produced by electric furnacing of ilmenite. Laboratory tests show that phosphorus pentoxide flux additions to oxidized slag enhance conversion to rutile by forming a phosphate-based glass matrix. This matrix contains most of the major impurities, including the oxides of iron, aluminum, magnesium manganese, and silicon. Rutile crystals of 5 to 150 microns in size were formed in slags heated to temperatures of 800 deg. to 1,550 deg. C. The synthetic rutile crystals were liberated from ground slag by treating with phosphoric acid to weaken the glass matrix, followed by attrition scrubbing. Rutile fractions analyzed as high as 94 percent titania content. In several instances, more than 90 percent of the titanium in the slag was recovered to yield combined rutile fractions containing 90.2 To 92.6 percent titania.
NTIS Accession No.
NTIS: PB 203 891
Page last reviewed: March 11, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division