Transformation of minerals in direct coal liquefaction residue under gasification atmosphere at high temperatures

摘要: Abstract The transformation behavior of mineral matters in direct coal liquefaction residue from Shenhua Corporation under gasification atmosphere at high temperatures was examined by X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). Mossbauer also applied to investigate the iron-bearing minerals valence distribution iron ash different temperatures. results show that major are quartz, calcium sulfate, millosevichite, pyrrhotite, kaolinite, calcite. At temperatures, they become anorthite, gehlenite, maghemite magnetite. Due formation gehlenite eutectic, exhibits low fusion temperature. characterized include maghemite, magnetite, fayalite, vitreous matter. content matter increases with increasing Meanwhile, Fe 2+ /Fe 3+ significantly 1.08 2.39 as temperature 1100 1200°C for reduction it is not obviously changed above 1200°C. Furthermore, liquid phase calculated FactSage owing increase phase. In hence, reason its