Mineralogical Variability of Fly Ashes Classified by Electrostatic Precipitator

摘要

The mineralogical compositions of bituminous fly ashes varied depending on the locations of hoppers attached to an electrostatic precipitator in coal-fired power plant. From the first hopper towards the third hopper, that is, as the particles of fly ashes decreased in size, the content of glassy phase increased, while the amount of alpha-quartz decreased. When the boiler was operated at full load in comparison with operating at half load, the content of glassy phase was greater. The chemical compositions of the glassy phase showed a tendency in Al_2O_3 increase, while SiO_2 decreased as the particles size became smaller.