Abstract
Partitioning of mercury in fly ashes having particle size distribution and its leaching characteristics were investigated for five different coals to estimate and to control mercury leaching rate in pulverized coal combustion processes. The fly ashes were sieved in seven classifications, and Hg content in the sieved ash was measured a direct determination by GF-AAS. It is found that mercury concentration in the classified is increased with increasing the average particle diameter, hi leaching tests, fly ash particles below 10 μm and above 106 μm were indicated high leaching rate of mercury. To reduce Hg emission, it is effective that large particle size fly ashes containing unburnt carbon and PM10 are decreased by size control of pulverized coal and combustion control.
