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Formation kinetics and transition mechanism of CaO·SiO2 in low-calcium system during high-temperature sintering

CaO·SiO2 在低钙高温烧结过程的生成动力学与转变机制

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Abstract

The crystal structure, formation kinetics and micro-morphology of CaO·SiO2 during high-temperature sintering process were studied in low-calcium system by XRD, FT-IR, Raman and SEM-EDS methods. When the molar ratio of CaCO3 to SiO2 is 1.0, β-2CaO·SiO2 forms firstly during the heating process, and then CaO·SiO2 is generated by the transformation reaction of pre-formed 2CaO·SiO2 with SiO2. 3CaO·SiO2 and 3CaO·2SiO2 do not form either in the heating or sintering process. Rising the sintering temperature and prolonging the holding time promote the phase transition of 2CaO·SiO2 to CaO·SiO2, resulting in the sintered products a small blue shift and broadening in Raman spectra. The content of CS can reach 97.4% when sintered at 1400 °C for 1 h. The formation kinetics of CaO·SiO2 follows the second-order chemical reaction model, and the corresponding apparent activation energy and pre-exponential factor are 505.82 kJ/mol and 2.16×1014 s−1 respectively.

摘要

利用XRD、FT-IR、Raman、SEM-EDS 等方法研究了CaO·SiO2 在低钙高温烧结过程的晶体 结构、生成动力学和微观组织。当反应物CaCO3 和SiO2 摩尔比为1.0 时, 加热过程中优先生成 2CaO·SiO2, 然后2CaO·SiO2 进一步与SiO2 反应生成CaO·SiO2; 烧结过程中不会生成3CaO·2SiO2 和 3CaO·SiO2。升高反应温度和延长保温时间有助于2CaO·SiO2 向CaO·SiO2 转化, 并使烧结产物的拉曼 光谱特征峰发生一定的蓝移和宽化。在1400 °C 烧结1 h 时CaO·SiO2 在烧结产物的含量能够达到 97.4%。CaO·SiO2 的生成动力学遵循二级化学反应模型, 相应的反应表观活化能和指前因子分别为 505.82 kJ/mol 和2.16×1014s−1。

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Authors and Affiliations

  1. Key Laboratory for Ecological Metallurgy of Multimetallic Mineral, Northeastern University, Shenyang, 110819, China

    Xiao-lin Pan  (潘晓林) & Hai-yan Yu  (于海燕)

  2. School of Metallurgy, Northeastern University, Shenyang, 110819, China

    Xiao-lin Pan  (潘晓林), Wei-xue Cui  (崔维学), Can Zhang  (张灿) & Hai-yan Yu  (于海燕)

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  1. Xiao-lin Pan  (潘晓林)
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  2. Wei-xue Cui  (崔维学)
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  3. Can Zhang  (张灿)
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  4. Hai-yan Yu  (于海燕)
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Contributions

The overarching research goals were developed by PAN Xiao-lin and YU Hai-yan. CUI Wei-xue and ZHANG Can provided and analyzed the measured data. The initial draft of the manuscript was written by PAN Xiao-lin and CUI Wei-xue. All authors replied to reviewers’ comments and revised the final version.

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Correspondence to Xiao-lin Pan  (潘晓林).

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Conflict of interest

PAN Xiao-lin, CUI Wei-xue, ZHANG Can, and YU Hai-yan declare that they have no conflict of interest.

Foundation item

Projects(51674075, 51774079) supported by the National Natural Science Foundation of China; Project(2018YFC1901903) supported by the National Key R&D Program of China; Project(N182508026) supported by the Fundamental Research Funds for the Central Universities of China

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Pan, Xl., Cui, Wx., Zhang, C. et al. Formation kinetics and transition mechanism of CaO·SiO2 in low-calcium system during high-temperature sintering. J. Cent. South Univ. 27, 3269–3277 (2020). https://doi.org/10.1007/s11771-020-4545-1

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