Kinetics of carbonated decomposition of hydrogarnet with different silica saturation coefficients

Xiao-feng Zhu; Ting-an Zhang; Guo-zhi Lü

doi:10.1007/s12613-019-1913-7

Volume 27 Issue 4

Apr. 2020

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2020 > 27(4): 472-482

Xiao-feng Zhu, Ting-an Zhang, and Guo-zhi Lü, Kinetics of carbonated decomposition of hydrogarnet with different silica saturation coefficients, Int. J. Miner. Metall. Mater., 27(2020), No. 4, pp. 472-482. https://doi.org/10.1007/s12613-019-1913-7

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Xiao-feng Zhu, Ting-an Zhang, and Guo-zhi Lü, Kinetics of carbonated decomposition of hydrogarnet with different silica saturation coefficients, Int. J. Miner. Metall. Mater., 27(2020), No. 4, pp. 472-482. https://doi.org/10.1007/s12613-019-1913-7

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Research Article

Kinetics of carbonated decomposition of hydrogarnet with different silica saturation coefficients

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Corresponding author:
Ting-an Zhang E-mail: zta2000@163.net
Received: 14 May 2019; Revised: 30 August 2019; Accepted: 6 September 2019; Available online: 28 October 2019

Abstract

Abstract

Carbonated decomposition of hydrogarnet is one of the vital reactions of the calcification–carbonation method, which is designed to dispose of low-grade bauxite and Bayer red mud and is a novel eco-friendly method. In this study, the effect of the silica saturation coefficient (x) on the carbonation of hydrogarnet was investigated from the kinetic perspective. The results indicated that the carbonation of hydrogarnets with different x values (x = 0.27, 0.36, 0.70, and 0.73) underwent two stages with significantly different rates, and the kinetic mechanisms of the two stages can be described by the kinetic functions R3 and D3. The apparent activation energies at Stages 1 and 2 were 41.96–81.64 and 14.80–34.84 kJ/mol, respectively. Moreover, the corresponding limiting steps of the two stages were interfacial chemical reaction and diffusion.
- Bayer red mud;
- hydrogarnet;
- calcification;
- carbonation;
- kinetics;
- silica saturation coefficient

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