Solid Precipitation Behaviors in Coal Slag from Different Primary Phases and Their Effects on Slag Viscosity from Thermochemistry and Experimental

Undesired solid precipitation in coal slag at high temperatures can cause serious blockages, or even the shutdown of gasifiers, due to a rapid increase viscosity. In this study, behaviors from different primary phases and under atmospheres were both experimentally theoretically investigated. Our results demonstrated that viscosity phase mullite was strongly influenced by atmosphere typical tapping temperature 1300 °C because content network formers. The partially crystallized significantly affected behavior. Iron converted magnetite hematite air reduced metallic iron reducing atmosphere. Increasing CaO improved reduction reaction crystallization Anorthite largely inhibited mild atmosphere, leading large difference atmospheres. contrast, slightly weak tendency mullite, as well its