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 degreesC 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 degreesC 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 reaction product, Li2TiF6, can be thermally decomposed to regenerate the LiF and TiF4. The pure TiF4 generated can be further treated to produce pigment grade TiO2, and the LiF can be recycled. Provided SiO2 is separated, the SiF4 gas can be recycled and returned to the fluoridation reactor.