Absorption of sulfur dioxide into aqueous double slurries containing limestone and magnesium hydroxide

Abstract

Abstract The absorption of dilute SO 2 into aqueous double slurries containing CaCO 3 and Mg(OH) 2 was carried out using a stirred tank with a plane gas‐liquid interface. The absorption rate increased and finally reached that under the completely gas‐film controlled conditions as the absorption process proceeded. The desulfurization process using the double slurry was formulated by a two‐reaction‐plane model in which there are no particles suspended in‐between the interface and the primary reaction plane. It was suggested from comparison of the experimental absorption rates with the theoretical predictions that 40 to 60% of the absorbed sulfur dioxide may be present as an effective magnesium sulfite ion pair.