Reactivity of Lime and Related Materials with Sulphur Dioxide
Dynamic TG studies were made on the uptake of sulphur dioxide by lime and related materials used as absorbents for the desulphurisation of industrial flue gases. Samples of quicklime, hydrated lime, limestone, magnesite and dolomite of widely different surface areas and particle sizes were calcined on a mass-flow balance in atmospheres containing various amounts of sulphur dioxide. Their relative effectiveness in reacting with sulphur dioxide could be seen rapidly by comparing the reaction rates with temperature and gas composition for each solid reactant. This indicated that only calcium oxide or calcium hydroxide could be reasonably considered as industrial desulphurising agents for use below 500°C. The greater reactivity of the hydrated lime samples at temperatures lower than those required for the other absorbents was related to the simultaneous formation of activated quicklime, especially at temperatures above 400°C.
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