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Attack of Tunisian phosphate ore by phosphoric acid

Kinetic study by means of differential reaction calorimetry

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Abstract

Kinetics of the attack of a Tunisian phosphate ore by phosphoric acid solution was calorimetrically investigated using a differential reaction calorimeter. Determination of the time constants (τ 1 and τ 2) and the transfer function of this device allowed calculation of the thermogenesis curves which were used for the kinetic study at different temperatures. It was found that the attack rate increased with increasing temperature and the kinetic results agree with the shrinking-core model with an ash layer diffusion control. The resulting apparent activation energy equals 25.4 ± 1.8 kJ mol−1, which is in the range determined by the isoconversional model (11.1–26.3 kJ mol−1).

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Authors and Affiliations

  1. LR15SE01 Materials, Cristallochemistry and Applied Thermodynamics Laboratory, Chemistry Department, Faculty of Science, Tunis El Manar University, 2092, Tunis, Tunisia

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

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  1. Amira Soussi-Baatout
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  2. Khemaies Ibrahim
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  3. Ismail Khattech
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  4. Mohamed Jemal
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Correspondence to Mohamed Jemal.

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Soussi-Baatout, A., Ibrahim, K., Khattech, I. et al. Attack of Tunisian phosphate ore by phosphoric acid. J Therm Anal Calorim 124, 1671–1678 (2016). https://doi.org/10.1007/s10973-016-5263-7

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