Abstract
Calcium hydroxide powder was coated with a silicon alkoxide and a chelate compound of aluminum, and heated at 500-800°C to prepare silica- and alumina-coated lime powders. Specific surface area and SO2 absorbability of silica- and alumina-coated lime powders were higher than those of the uncoated powder. Calcium silicate and calcium aluminate formed on the surface of these powders. It was considered that the improvement of SO2 absorbability for the silica-coated powder was attributed to an increase of specific surface area, while that for the alumina-coated powder arose from on increased acidity.
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