生石灰-シリカゲル混合粉体の加熱によるp-ワラストナイトの合成に及ぼす乾式粉砕効果

概要

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A powder mixture of calcium oxide (CaO) and silica-gel (amorphous SiO2) was subjected to grinding under dry atmospheric condition using a planetary ball mill to investigate its effect on synthesis of para-wollastonite (CaO·SiO2) powder by heating. The grinding of the mixture changes a crystalline structure of CaO into amorphous one within 5 hours. Accordingly, the mixture ground for 5 hours aggregates with homogeneous chemical composition, leading to the formation of a precursor of para-wollastonite by heating at 923 K. Para-wollastonite can be synthesized by heating the mixture ground for 2 hours at 1,273 K for 2 hours, while heating at around 1,400 K for about one week is necessary to synthesize it from the original mixture.
社団法人資源・素材学会の論文
1999-07-25