| 高岭土相转变的非等温动力学 |
| Non-Isothermal Kinetics for Phase Transformation of Kaolinite |
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| 摘要: |
| 关键词: 高岭土 相转变 差示扫描量热法 非等温动力学 迭代法 |
| 基金项目: |
| Abstract: The process of phase transformation of kaolinite was investigated by differential scanning calorimetry (DSC) and X-ray power diffraction (XRD). The iterative procedure along with the minimum deviation was employed to determine the kinetic parameters of phase transformation of kaolinite. Results show that the kaolinite phase transformation occurs from the metakaolin into mullite in the temperature range 975~1 040 ℃. The kaolinite phase transformation conforms to an accommodated nuclei production and nuclei growth model. The corresponding mechanism functions are f(α)=3(1-α)[-ln(1-α)]2/3 and G(α)=[-ln(1-α)]1/3. The activation energy Ea and pre-exponential factor A of kaolinite phase transformation are 840.44 kJ·mol-1 and 1.54×1034~1.65×1034 s-1, respectively. |
| Keywords: kaolinite phase transformation DSC non-isothermal kinetics iterative method |
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| 周 佳,何明中,张爱华,李 淋,傅凤英.高岭土相转变的非等温动力学[J].无机化学学报,2010,26(7):1279-1283. |
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