Calcium-barium sulfo-ferritealuminate(C_3BA_(3-y)F_(y)$)was synthesized by doping Ba-bearing calcium sulphoaluminate(C_3BA_3$)with Fe^(3+).The effects of calcination temperature,holding time and Fe-doping concentratio...Calcium-barium sulfo-ferritealuminate(C_3BA_(3-y)F_(y)$)was synthesized by doping Ba-bearing calcium sulphoaluminate(C_3BA_3$)with Fe^(3+).The effects of calcination temperature,holding time and Fe-doping concentration on the solid-state reaction process of the C_(3)BA_(3-y)F_(y)$(y=0,0.2,0.25,0.4,and 0.6)were investigated by the Rietveld/XRD quantitative phase analysis.The experimental results show that Fe-doping not only significantly improvs the synthesis of C_(3)BA_(3-y)F_(y)$,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 1300℃.The Ginstling equation is found to be the most appropriate kinetic model for the statistical fitting of C_(3)BA_(3-y)F_(y)$formation process,based on the mathematical model.It is observed that the apparent activation energy of C_(3)BA_(3-y)F_(y)$decreases and then increases with increasing Fe-doping concentration.展开更多
基金Funded by the National Key Research and Development Program of China(2021YFB3802002)the National Natural Science Foundation of China(Nos.52172021 and U22A20126)+4 种基金the Science Foundation for Excellent Young Scholars of Shandong Province(No.ZR2023YQ041)the Natural Science Foundation of Shandong Province(ZR2021ME123)the Taishan Scholars Program(No.tsqn202306224)the Science and Technology Innovation Support Plan for Young Researchers in Institutes of Higher Education in Shandong(No.2019KJA017)the'111 Center'。
文摘Calcium-barium sulfo-ferritealuminate(C_3BA_(3-y)F_(y)$)was synthesized by doping Ba-bearing calcium sulphoaluminate(C_3BA_3$)with Fe^(3+).The effects of calcination temperature,holding time and Fe-doping concentration on the solid-state reaction process of the C_(3)BA_(3-y)F_(y)$(y=0,0.2,0.25,0.4,and 0.6)were investigated by the Rietveld/XRD quantitative phase analysis.The experimental results show that Fe-doping not only significantly improvs the synthesis of C_(3)BA_(3-y)F_(y)$,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 1300℃.The Ginstling equation is found to be the most appropriate kinetic model for the statistical fitting of C_(3)BA_(3-y)F_(y)$formation process,based on the mathematical model.It is observed that the apparent activation energy of C_(3)BA_(3-y)F_(y)$decreases and then increases with increasing Fe-doping concentration.
