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The differences in the structure and thermal behavior of two coal gangues samples (Z-1 and Z-2) obtained from Inner Mongolia in China were investigated through thermogravimetry–derivative thermogravimetry (TG-DTG), X-ray diffraction (XRD), and Fourier-transform infrared (FT-IR) spectroscopy.. The TG-DTG results indicate that the two coal gangue samples present different dehydroxylation temperatures and loss on ignition values. The mineralogy of the Z-1 sample consisted of kaolinite and quartz, whereas that of the Z-2 sample consisted of kaolinite, boehmite and quartz. The XRD and FT-IR spectra revealed the thermal transmission behavior of the two coal gangue samples when temperature was increased from 300 °C to 1000 °C. The coal gangue samples lost hydration water at a temperature of up to 500°C, and the layer structure collapsed completely as the temperature increased. The typical bands in the FT-IR spectra of the two coal gangue samples are similar, but several differences were observed in the intensity and positions of bands. The intensity of the characteristic bands of boehmite in the samples at 3090 and 3280cm-1 decreased as the temperature increased, and the bands disappeared at 600 °C. The thermal behavior of the coal gangue samples differed because of impurities and mineralogical compositions.
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