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<p>This study investigates the kinetics of the dehydroxylation reaction of chrysotile asbestos, a process crucial for the thermal neutralisation and potential reuse of asbestos-containing waste. Chrysotile, historically the most widely used form of asbestos, a structural transformation upon heating, destroying its fibrous, hazardous form. The reaction was analysed using both non-isothermal thermogravimetry (from 2.5 to 22.5&#xa0;K·min⁻<sup>1</sup>) and isothermal calcination (from 823 to 973&#xa0;K). Activation energy (E<sub>a</sub>) was determined using the Friedman isoconversional method and Arrhenius analysis, yielding values of 303&#xa0;kJ&#xa0;mol⁻<sup>1</sup> and 188&#xa0;kJ&#xa0;mol⁻<sup>1</sup>, respectively. Despite the variation in E<sub>a</sub> due to methodological and experimental differences, both approaches identified diffusion-controlled mechanisms as the rate-limiting step, particularly the diffusion of water vapour from the reaction zone, but only below approximately 900&#xa0;K. At higher temperatures, the reaction appears to transition to a different kinetic regime. These findings deepen understanding of the reaction kinetics and contribute to the development of effective thermal treatment technologies for managing asbestos waste.</p>

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Chrysotile dehydroxylation reaction kinetic model fitting based on isothermal and non-isothermal thermogravimetry data

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月10日

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  • Anna Kasprzyk,
  • Robert Kusiorowski,
  • Magdalena Kujawa

摘要

This study investigates the kinetics of the dehydroxylation reaction of chrysotile asbestos, a process crucial for the thermal neutralisation and potential reuse of asbestos-containing waste. Chrysotile, historically the most widely used form of asbestos, a structural transformation upon heating, destroying its fibrous, hazardous form. The reaction was analysed using both non-isothermal thermogravimetry (from 2.5 to 22.5 K·min⁻1) and isothermal calcination (from 823 to 973 K). Activation energy (Ea) was determined using the Friedman isoconversional method and Arrhenius analysis, yielding values of 303 kJ mol⁻1 and 188 kJ mol⁻1, respectively. Despite the variation in Ea due to methodological and experimental differences, both approaches identified diffusion-controlled mechanisms as the rate-limiting step, particularly the diffusion of water vapour from the reaction zone, but only below approximately 900 K. At higher temperatures, the reaction appears to transition to a different kinetic regime. These findings deepen understanding of the reaction kinetics and contribute to the development of effective thermal treatment technologies for managing asbestos waste.