Basic properties and sintering performance of PMC vanadium titanium concentrate of South Africa
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Abstract:
The purpose of this paper is to study the physicochemical properties of PMC vanadium-titanium magnetite in South Africa, and reveal the effect of PMC concentrate on the sintering performances. The chemical and phase composition, size distribution and particle morphology were investigated by chemical analysis, XRD, LPSA and SEM-EDS, respectively. After that, sintering pot experiments were carried out to study the effect of PMC concentrate on the utilization factor, tumbler index and solid fuel consumption. The mechanism was clarified by investigating the microstructure of finished sinter. The results reveal that the iron content is as high as 63.460% while gangue content is low, which is of great value to the utilization. The main phase is magnetite and the fraction of particles not smaller than 74 μm is close to 70%. The sintering pot test shows that the utilization and strength is deteriorated obviously after adding 10% PMC concentrate, and the solid fuel consumption increased correspondingly. This is mainly attributed to the relative poor sintering performance of PMC concentrate, which affects the generation of liquid phase during sintering process. As a result, the strength of finished sinter is influenced. Worse still, the formation of perovskite destroys the bonding effect of the liquid phase as well as the microstructure of sinter.
