The flow behavior of high-temperature ash (HTA) and low-temperature ash (LTA) of high calcium coal in the heating process was investigated systematically. By means of the heating stage microscope, the behavioral changes of samples were studied visually. The composition and mineral matters transformations of HTA and LTA samples were analyzed by X-ray fluorescence and X-ray diffraction. The results show that the original composition of HTA sample is different from that of LTA sample. In addition, the HTA and LTA samples experience the shrinkage, fusion and spreading processes in succession. However, the volume change of HTA sample is different from that of LTA sample. The volume of LTA sample shows a slow change at the temperature lower than 800 °C, while the volume of HTA sample is unchanged. In the temperature range of 800°C–1100 °C, the remarkable shrinkage of HTA and LTA samples are demonstrated. The formation of srebrodolskite and gehlenite attributes to this volume change. Moreover, the sharp shrinkage of HTA and LTA samples is indicated at 1100°C–1300 °C. This is caused by the formation of eutectics. Because of the diverse content and species of mineral matters in LTA sample, the volume change of LTA sample is more remarkable than that of HTA sample. The maximal shrinkages of LTA and HTA sample are 57% and 53%, respectively.

系统地研究了高钙煤在加热过程中的高温灰分（HTA）和低温灰分（LTA）的流动行为。通过加热台显微镜，肉眼观察样品的行为变化。通过X射线荧光和X射线衍射分析了HTA和LTA样品的组成和矿物质转化。结果表明，HTA样品的原始成分与LTA样品的原始成分不同。此外，HTA和LTA样品相继经历了收缩，融合和铺展过程。但是，HTA样品的体积变化与LTA样品的体积变化不同。LTA样品的体积在低于800°C的温度下显示缓慢变化，而HTA样品的体积未发生变化。在800°C–1100°C的温度范围内，证明了HTA和LTA样品的显着收缩。闪长白云母和粗晶石的形成归因于这种体积变化。此外，表明HTA和LTA样品在1100°C–1300°C时急剧收缩。这是由于共晶的形成引起的。由于LTA样品中矿物质的含量和种类多样，因此LTA样品的体积变化比HTA样品的体积变化更显着。LTA和HTA样品的最​​大收缩率分别为57％和53％。LTA样品的体积变化比HTA样品更显着。LTA和HTA样品的最​​大收缩率分别为57％和53％。LTA样品的体积变化比HTA样品更显着。LTA和HTA样品的最​​大收缩率分别为57％和53％。