Conclusions
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4.1.
The measuring results of melting temperature, to some extent, depend on the measuring method. The hemisphere temperature (HT) measured with heating microscope is generally higher than its corresponding temperature (T2) obtained in the method of pyramid observation.
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4.2.
The melting temperature of coal ash, both under oxidizing and under reducing conditions, has a minimum value when its basic components is about 40%.
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4.3.
The ratio of silicon oxide to aluminum oxide can be used as a criterion of coal slagging property only if the coal ash contains a small amount of calcium oxide.
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4.4.
Equation (1) can be used to calculate the hemisphere temperature of coal ash in an oxidizing atmosphere.
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Xianglin, S., Ying, C., Haibin, L. (2002). Research on the Melting Points of Some Chinese Coal Ashes. In: Gupta, R.P., Wall, T.F., Baxter, L. (eds) Impact of Mineral Impurities in Solid Fuel Combustion. Springer, Boston, MA. https://doi.org/10.1007/0-306-46920-0_32
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