Study of fusibility of coal ash. II Effect of Fe2O3 addition on ash fusion behavior.:Effect of Fe2O3 Addition on Ash Fusion Behavior

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High temperature fusion behavior of mixtures of ash exhibiting a wide range of melting temperature and Fe2O3 additive under oxidizing (Air) and reducing (CO/CO2) atmospheres has been investigated by JIS M8801 and by X-ray diffraction method. (1) The melting temperature of ash-Fe2O3 mixtures was greatly reduced in the CO/ (C0+CO2) atmospheres of 0.09 to 0.8, where Fe2O3 was reduced to FeO. Hemispherical temper-ature of ash with Fe2O3 decreased with the increased addition of Fe2O3, and the minimum value of the hemispherical temperature was in the range of 1100 to 1150°C. Fe2O3 has been found more suitable fluxing element than Ca0 under that atmospheres. (2) Under oxidizing, CO-and CO2-rich atmospheres, hemispherical temperature remained constant or decreased slightly with increase Fe2O3 addition until Fe2O3 content reached about 30wt‰ and the fluxing action of iron was hardly observable. (3) Depending on FeO content, the main compounds detected were iron silicate, hercynite, fayalite, and almandite. The minimum hemispherical temperatures of the mixtures of ash and FeO additive were almost equal to the lowest temperature eutectic points in the FeO-Al2O3-SiO2 phase diagram.
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