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<p>Calcium-barium sulfo-ferritealuminate (C<sub>3</sub>BA<sub>3−<i>y</i></sub>F<sub><i>y</i></sub>$) was synthesized by doping Ba-bearing calcium sulphoaluminate(C<sub>3</sub>BA<sub>3</sub>$) with Fe<sup>3+</sup>. The effects of calcination temperature, holding time and Fe-doping concentration on the solid-state reaction process of the C<sub>3</sub>BA<sub>3−<i>y</i></sub>F<sub><i>y</i></sub>$ (<i>y</i>=0, 0.2, 0.25, 0.4, and 0.6) were investigated by the Rietveld/XRD quantitative phase analysis. The experimental results show that Fe-doping not only significantly improvs the synthesis of C<sub>3</sub>BA<sub>3−<i>y</i></sub>F<sub><i>y</i></sub>$, but also reduces the solid-state reaction potential energy barrier and then promots mineral formation. Nevertheless, the mineral begins to decompose when the Fe/Al ratio exceeds 2/13 and the calcination temperature exceeds 1 300 °C. The Ginstling equation is found to be the most appropriate kinetic model for the statistical fitting of C<sub>3</sub>BA<sub>3−<i>y</i></sub>F<sub><i>y</i></sub>$ formation process, based on the mathematical model. It is observed that the apparent activation energy of C<sub>3</sub>BA<sub>3−<i>y</i></sub>F<sub><i>y</i></sub>$ decreases and then increases with increasing Fe-doping concentration.</p>

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Kinetics in Solid-state Synthesis of Calcium-barium Sulfo-ferritealuminate (C3BA3−yFy$) Mineral and Its Formation Mechanism

  • 期刊论文

  • 发表日期：

    2025年4月14日

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  • Hui Yang,
  • Chengming Li,
  • Dongbing Jiang,
  • Xingyuan Bao,
  • Chen Liang,
  • Piqi Zhao

摘要

Calcium-barium sulfo-ferritealuminate (C3BA3−yFy$) was synthesized by doping Ba-bearing calcium sulphoaluminate(C3BA3$) with Fe3+. The effects of calcination temperature, holding time and Fe-doping concentration on the solid-state reaction process of the C3BA3−yFy$ (y=0, 0.2, 0.25, 0.4, and 0.6) were investigated by the Rietveld/XRD quantitative phase analysis. The experimental results show that Fe-doping not only significantly improvs the synthesis of C3BA3−yFy$, but also reduces the solid-state reaction potential energy barrier and then promots mineral formation. Nevertheless, the mineral begins to decompose when the Fe/Al ratio exceeds 2/13 and the calcination temperature exceeds 1 300 °C. The Ginstling equation is found to be the most appropriate kinetic model for the statistical fitting of C3BA3−yFy$ formation process, based on the mathematical model. It is observed that the apparent activation energy of C3BA3−yFy$ decreases and then increases with increasing Fe-doping concentration.