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<p>The effect of (CaO + SiO<sub>2</sub>) mass ratio on high-Ti vanadium titanomagnetite sintering was systematically studied at the fixed basicity (CaO/SiO<sub>2</sub>) of 2.0. The results show that sinter matrix strength is improved with (CaO + SiO<sub>2</sub>) mass ratio while the total iron content is reduced. Thermodynamic analysis indicates that the increase in (CaO + SiO<sub>2</sub>) mass ratio from 15.0 to 22.5&#xa0;wt.% contributes to the formation of liquid phase, especially silico-ferrite of calcium and aluminum (SFCA). In addition, the formation of perovskite is inhibited and liquid phase fluidity is improved. The porosity of sinter matrix is reduced by 34.5% and SFCA amount is increased by 47.2% when (CaO + SiO<sub>2</sub>) mass ratio is increased from 15.0 to 18.0&#xa0;wt.%. With the further increase in (CaO + SiO<sub>2</sub>) mass ratio, the structure of sinter matrix is too dense and the improved extent of SFCA amount is increasingly low. The appropriate (CaO + SiO<sub>2</sub>) mass ratio should be 18.0&#xa0;wt.% overall. Under this condition, sinter matrix strength is greatly improved by over 13.5% compared with the base case and the total iron content can be maintained at about 49&#xa0;wt.%.</p>

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Effect of SiO2 mass ratio on high-Ti vanadium titanomagnetite sintering at basicity of 2.0

  • 期刊论文

  • 发表日期：

    2025年2月25日

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  • Peng Hu,
  • Jun-jie Zeng,
  • Yu-xiao Xue,
  • Rui Wang,
  • Yong-da Li,
  • Ning-yu Zhang,
  • Shuo Zhang,
  • Xue-wei Lv

摘要

The effect of (CaO + SiO2) mass ratio on high-Ti vanadium titanomagnetite sintering was systematically studied at the fixed basicity (CaO/SiO2) of 2.0. The results show that sinter matrix strength is improved with (CaO + SiO2) mass ratio while the total iron content is reduced. Thermodynamic analysis indicates that the increase in (CaO + SiO2) mass ratio from 15.0 to 22.5 wt.% contributes to the formation of liquid phase, especially silico-ferrite of calcium and aluminum (SFCA). In addition, the formation of perovskite is inhibited and liquid phase fluidity is improved. The porosity of sinter matrix is reduced by 34.5% and SFCA amount is increased by 47.2% when (CaO + SiO2) mass ratio is increased from 15.0 to 18.0 wt.%. With the further increase in (CaO + SiO2) mass ratio, the structure of sinter matrix is too dense and the improved extent of SFCA amount is increasingly low. The appropriate (CaO + SiO2) mass ratio should be 18.0 wt.% overall. Under this condition, sinter matrix strength is greatly improved by over 13.5% compared with the base case and the total iron content can be maintained at about 49 wt.%.