Abstract
Fly ash produced in high-temperature coal combustion has a bimodal size distribution with most of the mass occurring in the size range 1 to 20 Am diameter. Most of the ash surface area is provided by submicron particles (d - 0.03 μm) even though these constitute only of the order of 1% of the total mass. Both kinds of particles are coated with a surface deposit of volatile trace elements such as As, Sb, and S. The distribution of these species between the different size modes of the ash is influenced by the amount of submicron particulate produced during combustion. The amounts of trace species deposited on the larger particles are greatly in excess of those expected from either direct vapor condensation or a two-step process of condensation on the submicron particles followed by the scavenging of these fine particles by their larger counterparts. The data are explicable in terms of a chemically controlled surface deposition model.
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