Formation of calcium titanate in the carbothermic reduction of vanadium titanomagnetite concentrate by adding CaCO3

The formation of calcium titanate in the carbothermic reduction of vanadium titanomagnetite concentrate (VTC) by adding CaCO(3)was investigated. Thermodynamic analysis was employed to show the feasibility of calcium titanate formation by the reaction of ilmenite and CaCO(3)in a reductive atmosphere, where ilmenite is more easily reduced by CO or carbon in the presence of CaCO3. The effects of CaCO(3)dosage and reduction temperature on the phase transformation and metallization degree were also investigated in an actual roasting test. Appropriate increase of CaCO(3)dosages and reduction temperatures were found to be conducive to the formation of calcium titanate, and the optimum conditions were a CaCO(3)dosage of 18wt% and a reduction temperature of 1400 degrees C. Additionally, scanning electron microscopy-energy dispersive spectrometry (SEM-EDS) analysis shows that calcium titanate produced via the carbothermic reduction of VTC by CaCO(3)addition was of higher purity with particle size approximately 50 mu m. Hence, the separation of calcium titanate and metallic iron will be the focus in the future study.