Mineral behavior of low-temperature lignite ashes under gasification atmosphere

Investigation on the physicochemical properties of coal char during pressurized pyrolysis and the mineral transformations of coal ash during pressurized O2/N2 and O2/CO2 combustion

“…Moreover, Jing et al [ 11 ] studied the impact of pressure on the fusibility of ash and concluded that the interactions among different mineral matters were also dependent on the reaction atmosphere at elevated pressure. Li et al [ 12 ] examined the ash obtained from the reducing atmosphere at different pressures and stated that with increasing pressure, the decompositions of muscovite and calcite were restrained, whereas the formations of orthoclase and iron minerals were enhanced. In our previous work, [ 13 ] the experimental results revealed that as the pressure increased, the high‐temperature minerals (eg, mullite) in the ash disappeared and some low‐temperature minerals (eg, calcite) were found in the ash.…”