Abstract
The oxidation of FeV 2O 4, synthetic coulsonite, in a sodium carbonate mixture was studied by using thermal analysis and X-ray powder diffraction techniques. The vanadium is converted to water-soluble sodium vanadates in the temperature range 300°C to 800°C. Product formation is dependent on the amount of sodium carbonate present in the mixture. Na 3VO 3 and Fe 2O 3 were formed in a stoichiometric mole ratio of FeV 2O 4:Na 2CO 3 of 1:1 whereas Na 3VO 4, Na 4V 2O 7 and Fe 2O 3 were formed in a 2:5 mole ratio mixture and Na 3VO 4 and NaFeO 2 in a 1:5 mole ratio mixture. This temperature is much lower that the processing temperature of ∼1050°C currently used for the roasting of a titaniferous magnetite ore.
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