Abstract

This work has studied the effect of different amount of CaCO3 on three low- fusion temperature coals’ST. It implies the rule of CaCO3’s effect on coal’s fusibility in the experiment process, with the help of the X-Ray diffraction and CaO-Al2O3-SiO2 system ternary phase diagrams can explain the ash fusion mechanism after added the CaCO3, and also discussed CaO’s impact on the coal ash’s flubility. The result shows that along with the CaO’s increasing, the coal ash fusion temperature is decreasing first,the it will be increasing finally, when CaO in coal ash preponderate over a certain content, the coal ash fusion temperature will increase.the mechanism shows that during the heating process, CaO will react with other components, this will create some compounds with high Ca content.these compounds can form eutectic compounds, so the coal ash fusion temperature will decrease, whe the content of CaO is excessive, because of the excessive CaO, the temperarure will increase.

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