关键词: 硅铝比;钙镁耦合;模拟灰;XRD;SEM-EDX

Abstract: Factitious ash of different Si/Al ratio were prepared by using chemical reagents, and law of their flow temperature were studied with the change of compound proportion of CaO and MgO.Mineral transformation process was analyzed, and mechanism of coupling interaction of calcium and magnesium were explored by using XRD and SEM-EDX.The results show that with increasing of Si/Al ratio, the strength of coupling intensity of calcium and magnesium on reducing coal ash-fusibility increased at first and then decreased.It reaches maximum when Si/Al ratio is 1.5.Interacting between anorthite and forsterite at low temperature is main reason why coupling intensity of calcium and magnesium can reduce coal ash-fusibility.When Si/Al ratio is 1.0 or 4.0,with the proportion of MgO increasing in compound flux,the ash fusion temperatures come down because of the establishment of anorthite's reaction system and diopside's reaction system at low temperature.It does not show coupling effect of calcium and magnesium.With the increase of Si/Al ratio, schistose ash slag transformed macroaggregate or flocculatidn in ash slag of same Si/Al ratio.SEM-EDX analysis results are consistent with XRD analysis results.

Key words: Si/Al ratio;coupling intensity of calcium and magnesium;factitious ash;XRD;SEM-EDX