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<p>A new calcite flux can be directly used for iron ore sintering via the full substitution for burnt lime and limestone. Compared with limestone, calcite flux possesses higher CaO content, lower cost and less impurity elements. After calcination, the activity of calcite flux is improved with the reduction in its particle size, which is consistently better than that of burnt lime and calcined limestone. With the utilization of calcite flux, the formation of liquid phase is promoted, and liquid phase fluidity is improved. In sinter pot tests, the permeability of sinter layer is not deteriorated when calcite flux is added. In addition, the heat and mass transfer conditions are significantly improved with the full substitution of calcite flux for burnt lime and limestone. The positive effect is enhanced with the reduction in calcite flux particle size. After calcite flux particle size is optimized, sinter consolidation characteristics are greatly improved. A denser pilotaxitic sinter microstructure is formed with much higher amount of sillico-ferrite of calcium and aluminum and lower porosity. When the contents of 1–2 and 0–1&#xa0;mm particles in calcite flux are kept at 70 and 30 wt.%, respectively, sintering indices are overall better. Compared with the base case, the tumble index, productivity and yield are increased by 17.0%, 7.4% and 2.9%, respectively, while solid fuel rate is reduced by 9.6%, and carbon emissions in iron ore sintering are greatly reduced.</p>

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Effective utilization of a new calcium flux in iron ore sintering for lower carbon emissions and better sinter consolidation

  • 期刊论文

  • 发表日期：

    2026年1月19日

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  • Jun-Jie Zeng,
  • Shao-Xian Xie,
  • Yu-Xiao Xue,
  • Rui Wang,
  • Yang You,
  • Ming-Rui Yang,
  • Xue-Wei Lv

摘要

A new calcite flux can be directly used for iron ore sintering via the full substitution for burnt lime and limestone. Compared with limestone, calcite flux possesses higher CaO content, lower cost and less impurity elements. After calcination, the activity of calcite flux is improved with the reduction in its particle size, which is consistently better than that of burnt lime and calcined limestone. With the utilization of calcite flux, the formation of liquid phase is promoted, and liquid phase fluidity is improved. In sinter pot tests, the permeability of sinter layer is not deteriorated when calcite flux is added. In addition, the heat and mass transfer conditions are significantly improved with the full substitution of calcite flux for burnt lime and limestone. The positive effect is enhanced with the reduction in calcite flux particle size. After calcite flux particle size is optimized, sinter consolidation characteristics are greatly improved. A denser pilotaxitic sinter microstructure is formed with much higher amount of sillico-ferrite of calcium and aluminum and lower porosity. When the contents of 1–2 and 0–1 mm particles in calcite flux are kept at 70 and 30 wt.%, respectively, sintering indices are overall better. Compared with the base case, the tumble index, productivity and yield are increased by 17.0%, 7.4% and 2.9%, respectively, while solid fuel rate is reduced by 9.6%, and carbon emissions in iron ore sintering are greatly reduced.