Mineral Transition of Calcium Aluminate Clinker during High-Temperature Sintering with Low-lime Dosage

doi:10.1016/j.jmst.2015.10.012

Abstract

Abstract: The mineral transition mechanism and physicochemical property of calcium aluminate clinker sintered at 1350 °C were systematically studied using analytical reagent α-Al₂O₃, CaCO₃ and SiO₂ when the molar ratio of CaO to Al₂O₃ is 1.0. The results show that the formation of Ca₂SiO₄ accelerates the diffusion of CaO and Al₂O₃, which promotes the formation of CaAl₂O₄ determined by dilatometer, X-ray diffraction, Fourier transform infrared spectroscopy and scanning electron microscopy methods. CaAl₄O₇, Ca₃Al₂O₆, Ca₃SiO₅ and Ca₂Al₂SiO₇ only exist in the initial stage of reactions, the amounts of which decrease with the increase of sintering duration. Ca₃Al₂O₆ and Ca₁₂Al₁₄O₃₃ react with Al₂O₃ and CaAl₄O₇ to form CaAl₂O₄, while Ca₂Al₂SiO₇ reacts with CaO and Ca₁₂Al₁₄O₃₃to form Ca₂SiO₄ and CaAl₂O₄. The sintered clinker contains CaAl₂O₄ and γ-Ca₂SiO₄ as well as some Ca₁₂Al₁₄O₃₃ when the sintering duration is longer than 1.0 h. The differential scanning calorimetry results reveal that Ca₂SiO₄, Ca₂Al₂SiO₇ and CaAl₂O₄ are formed at 985 °C, 1045 °C and 1339 °C, respectively. Increasing the sintering duration contributes to the transition of β-Ca₂SiO₄ to γ-Ca₂SiO₄, which improves the pulverization and alumina leaching property of the sintered clinker.

Key words: Sintering, Pulverization, Mineral, Calcium aluminates, Microstructure

Di Zhang, Xiaolin Pan, Haiyan Yu, Yuchun Zhai. Mineral Transition of Calcium Aluminate Clinker during High-Temperature Sintering with Low-lime Dosage[J]. J. Mater. Sci. Technol., 2015, 31(12): 1244-1250.

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