無機塩を添加した粉砕石灰石の粉粒流動層による仮焼で得られた多孔質酸化カルシウム微粉末の吸湿特性

概要

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Small amounts of inorganic salts like sodium carbonate and calcium acetate were used as impregnants to pulverized limestone, which was then calcined in a powder-particle fluidized bed (PPFB) in nitrogen atmosphere at ambient pressure. Impregnation of 6-μm limestone with 1 mass% sodium carbonate and 1 mass% calcium acetate lowered the decomposition temperature by 30 K, making a 10% increase of calcination conversion at 1073 K. Additive impregnation involving calcium acetate produced macropores of larger than 50 nm in the reactant powders. Calcination with additive impregnation at 1073 K broadened the size of pores of the calcines to larger ones, newly producing 10-100 nm pores. These changes enhanced the ultimate moisture absorptivity by up to 20% as compared to the case without additive impregnation. However, calcination at 1173 K improved only the initial absorption rate.
社団法人日本セラミックス協会の論文
2007-07-01