Journal article

Separation of titanium tetrafluoride from a gaseous mixture with silicon tetrafluoride using lithium fluoride

Y Tsaur, TK Pong, J Besida, TA O'Donnell, DG Wood

INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH | AMER CHEMICAL SOC | Published : 2002

Abstract

A new process for producing pigment grade TiO2 from low grade ores such as ilmenite is being developed at the University of Melbourne. In this process, the titanium content of the ore is extracted by reaction with SiF4 at about 800°C to produce a gaseous intermediate product TiF4. The TiF4 leaves the reactor with SiO2 fume and unreacted SiF4 gas and needs to be isolated. One method of separating TiF4 from the gas mixture is by reaction with LiF at 350-450°C to form a stable solid, Li2TiF6. Experimental work has been performed to assess the feasibility of this separation method. It is shown that, under carefully chosen conditions, the LiF reacts selectively with TiF4 but not with SiF4. The re..

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