Abstract

Tests in a fixed-bed sorption unit were made to evaluate the reactivity of ten naturally occurring limestones and dolomites with sulfur dioxide in flue gas. Reactivity of individual samples varied with calcination time, calcination temperature, and reaction temperature, the variations in reactivity among the different test materials, however, were greater and more significant. No correlation was found between differences in reactivity and chemical composition. Physical properties of the reactant materials appear to be important in sorbent reactivity. Although much additional research remains to be done, work thus far indicates that utilizing limestone or dolomite for removal of SO₂ from flue gas shows promise of being technically and economically feasible.