Kinetics of the Reaction of SO2 with Calcined Limestone

It is generally assumed that limestone absorbs SO2 by a mechanism involving two consecutive steps, dissociation of the calcium carbonate followed by reaction of C.0 with sulfur dioxide. be important in any of the proposed pollution control processes. and especially in the dry injection process (Potter, 1968). Several investigators (Harrington, 1968, Potter, 1969) have determined the saturation capacities of a large number of naturally occurring limestones and dolomites under various conditions of reaction with SO2. Other studies under way will define the rate of reaction of uncalcined limestones in the disperse phase (Lougher and mutant, 1968). The purpose of the investigation reported in this paper is to determine the rate of reaction of limestones after calcination under standardized conditions. It is expected that the rate of the second step will