The oxidation of FeV2O4 by oxygen in a sodium carbonate mixture

The oxidation of FeV2O4 synthetic coulsonite, in a sodium carbonate mixture was studied by using thermal analysis and X-ray powder diffraction techniques. The vanadium is converted to warer-soluble sodium vanadates in the temperature range 300 degreesC to 800 degreesC. Product formation is dependent on the amount of sodium carbonate present in the mixture. Na3VO3 and Fe2O3 were formed in a stoichiometric mole ratio of FeV2O4:Na2CO3 of 1:1 whereas Na3VO4, Na4V2O7 and Fe2O3 were formed in a 2:5 mole ratio mixture and Na3VO4 and NaFeO2 in a 1:5 mole ratio mixture. This temperature is much lower that the processing temperature of similar to 1050 degreesC currently used for the roasting of a titaniferous magnetite ore. (C) 2001 Published by Elsevier Science Ltd. All rights reserved.