Study On Improving The Fusibility Of Shenhua-coal-ash

Coal plays an extremely important role in the development of Chinese national economy as the main energy sources. Mineral content in coal has greatly affected the coal processing and rational utilization. Minerals in coal directly affect the behavior of coal combustion and its ash fusibility. Because of relatively low fused temperature of the ash, Shenhua Coal is utilized restrictedly in China. In order to satisfy industrial demand, it must be required to improve the ash fusibility.The changing law of coal-ash fusibility with content of the silicon dioxide, aluminum oxide, ferric oxide, calcium oxide and sodium oxide, magnesia, titanium oxide, sulphide and the unburned carbon in the ash was systematically studied in this paper. The experimental samples are the factitious ash composed by the chemical based on the content-character of the Shenhua coal. The law of influence of each component on fusibility of factitious ash was found out by measuring the samples' melt point and XRD of the melt. And the key factors of influence on low fused temperature of Shenhua-coal-ash were researched.The results showed that content of silicon dioxide, aluminum oxide, ferric oxide,calcium oxide and sodium oxide, magnesia, titanium oxide, sulphide and theunburned carbon affects the fusibility of ash each other. Increasing the content of TiO2 the melt point was heightened, and increasing the content of Fe2O3 and Na2O the melt point was lowered. Silicon dioxide, calcium oxide and aluminum oxide had dual effect. The effect of sulphide and the unburned carbon was complicated. Magnesia hardly impacts on the melt point. Finally, additive schemes increasing fused temperature of Shenhua-coal-ash were found.