Research on Activation of Coal Gasification Slag with Physical and Chemical Coupling Excitation
Coal gasification slag(CGS)contains abundant silicon-aluminum components and has potential pozzolanic activity,but the silicon-aluminum oxide components are mostly crystalline,which hinders its resource utilization.In order to explore the effect of physical and chemical coupling excitation on the activity of CGS,particle size analysis,viscosity,coagulation time,compressive strength,and activity index were used to evaluate the activity excitation effect under different excitation conditions.At the same time,SEM and XRD were used to analyze the microstructure and material composition of coal gasification slag filling materials,and to investigate the excitation mechanism of CGS.The results show that physical and chemical coupling excitation is more effective than single physical excitation.The optimal excitation condition for CGS is milling time of 100 min and Na2SO4 dosage of 2.5％or milling time of 100 min and Na2SiO3 dosage of 7％.The activity index of physical and chemical coupling excitation under above optimal conditions can be increased by 7.13％and 7.72％compared to that of single physical excitation.The physical and chemical coupling promotes the transformation of crystalline silicon-aluminum ions into amorphous form,which can stimulates the formation of hydration products and enhance activity of CGS.
Coal gasification slagPhysical and chemical coupling excitationPozzolanic activityHydration product
万方数据
维普
