Autoxidation of sulphur dioxide in aqueous flyash suspensions

Abstract

The fact that the thermal power and other plants continuously belch SO₂ and flyash concurrently made us to look into the chemistry of autoxidation of aqueous sulphur dioxide in aqueous suspensions of four different flyash samples obtained from three different thermal power and a fertilizer plants. The particle sizes and metal contents of each flyash sample were determined. Detailed kinetics investiaation showed the major catalysis to be due to leached trace metal ions, and in agreement with the general rate law.

where, a = ≤ 0.5; b = 1.5–2; c = 0.4–1.5

The atmospheric calculations indicated the conversion rates of around 0.34 to 1. “59% due to wetted flyash aerosols.