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Dissolution kinetics of fluorapatite in the hydrochloric acid solution

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Abstract

A thermochemical study of hydrochloric acid attack of synthetic fluorapatite was performed by a DRC. The calculated thermogenesis curves show one peak. The plot of the heat quantity as a function of the dissolved mass undergoes only one straight segment, and the thermogenesis curves present a single peak, suggesting the occurrence of a one-step dissolution process. The dissolution kinetics was examined according to the heterogeneous reaction models and showed that the dissolution is controlled by the product layer diffusion process with a reaction rate expressed by the following semiempirical equation; \(\left[ {1 + 2(1 - X) - 3(1 - X)^{{\frac{2}{3}}} } \right] = 3195 \times 10^{ - 2} C^{0.145} \left( {\frac{S}{L}} \right)^{ - 0.628} e^{{ - \frac{2600}{\text T}}} t\). The activation energy was determined as 21.6 ± 1.5 kJ mol−1

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Authors and Affiliations

  1. Material, Crystallochemistry and Applied Thermodynamics Laboratory LR15SE01, Chemistry Departement, Faculté des Sciences de Tunis, Université de Tunis El Manar, 2092, Tunis, Tunisia

    Khemaies Brahim, Amira Soussi-Baatout, Ismail Khattech & Mohamed Jemal

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  1. Khemaies Brahim
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  2. Amira Soussi-Baatout
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  3. Ismail Khattech
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Correspondence to Ismail Khattech.

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Brahim, K., Soussi-Baatout, A., Khattech, I. et al. Dissolution kinetics of fluorapatite in the hydrochloric acid solution. J Therm Anal Calorim 129, 701–708 (2017). https://doi.org/10.1007/s10973-017-6221-8

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  • DOI: https://doi.org/10.1007/s10973-017-6221-8

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