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<p>This study investigated cristobalite as the research object to examine the relationship between microwave power, sample mass and initial moisture content on microwave drying performance. Within cristobalite, moisture molecules existed in the forms of bound water, loosely bound water and free water. The optimal configuration (585.84&#xa0;W power, 20% initial moisture content and a drying duration of 5.18&#xa0;min) was determined through process analysis and optimisation. Under these conditions, the dehydration rate reached 82.51%, the specific energy consumption was 14.56&#xa0;kW·h/kg and the drying rate was 36.84&#xa0;g/h. The microwave drying process of cristobalite was effectively described by a Simplified Fick’s diffusion model. The effective moisture diffusion coefficients ranged from 3.68 × 10<sup>− 14</sup> to 6.03 × 10<sup>− 14</sup> m<sup>2</sup>/s under various microwave power conditions, and the activation energy was calculated to be 10.97&#xa0;W/g.</p>

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Microwave drying of cristobalite: kinetics, optimization and moisture diffusion analysis

  • 期刊论文

  • 发表日期：

    2025年11月22日

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  • Yixuan Zhang,
  • Lei Xu,
  • Jiayu He,
  • Yongfen Sun,
  • Junyu Lu,
  • Huanpei Xia

摘要

This study investigated cristobalite as the research object to examine the relationship between microwave power, sample mass and initial moisture content on microwave drying performance. Within cristobalite, moisture molecules existed in the forms of bound water, loosely bound water and free water. The optimal configuration (585.84 W power, 20% initial moisture content and a drying duration of 5.18 min) was determined through process analysis and optimisation. Under these conditions, the dehydration rate reached 82.51%, the specific energy consumption was 14.56 kW·h/kg and the drying rate was 36.84 g/h. The microwave drying process of cristobalite was effectively described by a Simplified Fick’s diffusion model. The effective moisture diffusion coefficients ranged from 3.68 × 10− 14 to 6.03 × 10− 14 m2/s under various microwave power conditions, and the activation energy was calculated to be 10.97 W/g.