The thermal activation process of coal gangue selected from Zhungeer in China

• Published in: Journal of thermal analysis and calorimetry 2016-12, Vol.126 (3), p.1559-1566
• Main Authors: Li, Lixin, Zhang, Yinmin, Zhang, Yongfeng, Sun, Junmin, Hao, Zhifei
• Format: Article
• Language: English
• Subjects: Analytical Chemistry; Boehmite; Chemistry; Chemistry and Materials Science; Clay minerals; Inorganic Chemistry; Measurement Science and Instrumentation; Physical Chemistry; Polymer Sciences; Scanning electron microscopy; X-ray diffraction
• ISSN: 1388-6150; 1588-2926
• DOI: 10.1007/s10973-016-5711-4

The thermal behavior of coal gangue selected from Zhungeer, Inner Mongolia Autonomous Region of China, was investigated by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, thermogravimetry (TG), derivative thermogravimetry (DTG), and scanning electron microscope (SEM). The XRD data indicated that the mineral compositions of the coal gangue were kaolinite, boehmite, and quartz. The coal-gangue sample was considered as belonging to a typical mixture of kaolinite and boehmite. The XRD and FT-IR spectra clearly showed that the structural changes and dehydroxylation of coal gangue occurred with increased temperature from 100 to 900 °C. The reaction activity of coal gangue could be effectively improved by calcination. The calcined coal gangue contained considerable active amorphous Al 2 O 3 and SiO 2 and had significant loss on ignition. The optimum activation temperature range of coal gangue was from 600 to 700 °C. The dissolution contents of SiO 2 and Al 2 O 3 were 92.31 and 64.44 %, respectively, when the calcination temperature at 700 °C.