Dissolution of Calcium Ion from Coal Fly Ash in Supersonic Flow Field

Abstract

The dissolution of calcium ion from coal fly ash and flow behavior of the slurry in supersonic flow field were investigated. It was found that the maximum concentration of the coal fly ash showing slurry in supersonic flow field was 55 mass%, but the flow behavior of the slurry was quite different on the boundary of 25 mass%. The solubility of Ca²⁺ ion dissolved from the coal fly ash was measured after operation of membrane process combined with supersonic washing. Consequently, it was found that the concentration of C^a2+ ion increased with increasing time, and the value reached the maximum at 60 minuts. The permeation flux of ceramic membrane in supersonic flow field decreased with increasing time because of the pore narrowing.