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Mineral transition and formation mechanism of calcium aluminate compounds in CaO-Al2O3-Na2O system during high-temperature sintering

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Abstract

The mineral transition and formation mechanism of calcium aluminate compounds in CaO-Al2O3-Na2O system during the high-temperature sintering process were systematically investigated using DSC-TG, XRD, SEM-EDS, FTIR, and Raman spectra, and the crystal structure of Na4Ca3(AlO2)10 was also simulated by Material Studio software. The results indicated that the minerals formed during the sintering process included Na4Ca3(AlO2)10, CaOAl2O3, and 12CaO·7Al2O3, and the content of Na4Ca3(AlO2)10 could reach 92wt% when sintered at 1200°C for 30 min. The main formation stage of Na4Ca3(AlO2)10 occurred at temperatures from 970 to 1100°C, and the content could reach 82wt% when the reaction temperature increased to 1100°C. The crystal system of Na4Ca3(AlO2)10 was tetragonal, and the cells preferred to grow along crystal planes (110) and (210). The formation of Na4Ca3(AlO2)10 was an exothermic reaction that followed a secondary reaction model, and its activation energy was 223.97 kJ/mol.

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Acknowledgements

This work was financially supported by the National Key R&D Program of China (No. 2018YFC1901903), the National Nature Science Foundation of China (Nos. 51674075 and 51774079), and the Fundamental Research Funds for the Central Universities, China (No. N182508026).

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

    Hai-yan Yu, Xiao-lin Pan, Yong-pan Tian & Gan-feng Tu

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  1. Hai-yan Yu
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  2. Xiao-lin Pan
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Correspondence to Xiao-lin Pan.

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Yu, Hy., Pan, Xl., Tian, Yp. et al. Mineral transition and formation mechanism of calcium aluminate compounds in CaO-Al2O3-Na2O system during high-temperature sintering. Int J Miner Metall Mater 27, 924–932 (2020). https://doi.org/10.1007/s12613-019-1951-1

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  • DOI: https://doi.org/10.1007/s12613-019-1951-1

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