Study of the effect of fly ash on desulfurization by lime

Fly ash was used as an additive, and the effect of it on desulfurization by lime at 400–800°C was studied experimentally. The conversion rate of fly ash–lime to calcium sulfate was found to be greater than that when using lime alone. One reason is that fly ash can act as a support medium for lime, thereby increasing its dispersion and extending its effective reaction surface area. Fly ash with a high iron or its oxides is likely to have some ability to absorb particles of lime on its surface.