Investigation on Characterization and Pyrolysis of Some Coals from Mongolia

This study reports the technical characteristics, the organic elemental composition of coal, and the inorganic elemental composition of coal ashes from four selected coals including Tavan tolgoi, Nariin sukhait, Baganuur and Shivee-Ovoo deposits in Mongolia. The thermal stability analyses of the organic mass in coal samples were also conducted with thermogravimetric analysis and discussed with the detailed mechanisms of the thermal decomposition of the coal organic mass. Furthermore, the coal samples were processed by pyrolysis at different heating temperatures and determined the yields of pyrolysis products such as hard residue, condensed liquid (tar and pyrolysis water), and uncondensed gas products. The coal ashes from the selected coals were also studied in detail and report that the ashes of high-rank coals of Tavan tolgoi and Nariin sukhait deposits have acidic character and ashes of low-rank coals of Baganuur and Shivee-Ovoo deposits have alkaline character. In addition, the coals samples from Tavan tolgoi, Nariin sukhait, Shivee-Ovoo, and Baganuur deposits were processed by pyrolysis at different heating temperatures and determined with the yields of pyrolysis products such as hard residue, condensed liquid (tar and pyrolysis water), and uncondensed gas products. The yields of hard residue from high-rank coals of Tavan tolgoi and Nariin sukhait were higher than that of low-rank coals of Baganuur and Shivee-Ovoo coal. The dewatered tar products of pyrolysis were investigated for chemical composition analysis.