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Small an2le X-ray scattering study on change of fractal property of Witbank coal with heat treatment

机译：热处理对Witbank煤的分形特性影响的小角X射线散射研究

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Change in the surface fractal dimension (D_s) of Witbank coal with heat treatment was studied using small angle X--ray scattering. It was found that D_s changes systematically depending on the temperature and the heating rate. Especially in the pre-softening stage, D_s decreased with increasing temperature. From thermogravimetric and differential scanning calorimetric analyses, we concluded that this was derived from a physical structural change in coal. It was also found that there are lower limits (F_min) of fractal distribution of pore surface. Further, these limits change greatly at the threshold of the coal softening temperature. It is concluded that the physical structural change of coal takes place at lower temperatures than that thought so far, and that D_s and F_min are valuable parameters for representing the structural changes with heat treatment.
机译：使用小角度X射线散射研究了经过热处理的威特班克煤的表面分形维数（D_s）的变化。发现D_s根据温度和加热速率而系统地变化。特别是在预软化阶段，D_s随着温度的升高而降低。通过热重分析和差示扫描量热分析，我们得出结论，这是由于煤的物理结构变化引起的。还发现孔表面的分形分布存在下限（F_min）。此外，这些极限在煤软化温度的阈值处发生很大变化。可以得出结论，煤的物理结构变化发生在比迄今所认为的更低的温度下，并且D_s和F_min是代表热处理引起的结构变化的有价值的参数。

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