Effect of Preformed Calcium Ferrite Addition on Sintering Behavior of Vanadium Titanium Magnetite Ore

A new approach is proposed to improve the strength of the vanadium titanium magnetite (VTM) sinter by adding preformed calcium ferrite (CF) to partially substitute the CaO. The effects of the sintering temperature, oxygen partial pressure (pO(2)), heating time, and substitution ratio of preformed CF on the mineralogy of the VTM sinter are examined through tablet sintering. The results indicate that sintering temperature significantly affects the matrix structure and pore morphology by influencing solid-liquid assimilation and bubble coalescence. With an increase in pO(2), the generation of calcium ferrites and hematite is favored, and the matrix transforms into a melting corrosion structure. Heating time mainly affects the pore shape. The addition of preformed CF to VTM sintering can not only inhibit the generation of perovskite and promote the formation of calcium ferrites but also increase the quantity of melts and promote solid-liquid assimilation.

Automated summary

A new approach to improve the strength of vanadium titanium magnetite sinter is proposed by adding preformed calcium ferrite to partially substitute CaO. Factors like sintering temperature, oxygen partial pressure, heating time, and substitution ratio of preformed CF are examined for their effects on the mineralogy of VTM sinter. The addition of preformed CF not only inhibits perovskite generation and promotes the formation of calcium ferrites, but also increases the quantity of melts and promotes solid-liquid assimilation.