著者
梅田 純子 高田 龍一 道浦 吉貞 近藤 勝義
出版者
一般社団法人 スマートプロセス学会 (旧高温学会)
雑誌
スマートプロセス学会誌 (ISSN:2186702X)
巻号頁・発行日
vol.3, no.5, pp.323-327, 2014-09-20 (Released:2015-08-01)
参考文献数
5

Rice husks, one of the typical agricultural wastes, consist with 70-75 mass% of organics and 15-20 mass% of amorphous silica. Silica can be obtained by combusting rice husks in air. However, silica purity is reduced by metallic impurities contained in rice husks. To extract high-purity amorphous silica from rice husks, the citric acid leaching process was developed to remove the metallic impurities from rice husks. By optimizing the citric acid solution concentration and combustion temperature of rice husks, completely amorphous silica ashes with 99.5 mass% were obtained. To establish the large-scale equipment to produce high purity amorphous rice husk silica, the process parameters in the citric acid leaching and air combustion were optimized. There was no significant difference of silica purity and the impurity contents of rice husk ashes by using between small-scale and large-scale equipment. Citric acid leached rice husk ashes were employed as the reinforcements of concrete materials. Compressive strength in use of high-purity amorphous silica revealed a higher value compared to the use of silica fume and raw rice husk ashes. The effect of citric acid leached rice husk ashes was high pozzolanic reactivity due to high-purity amorphous silica particles and the large surface area due to their porous structures.

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世界保健機関付属国際癌研究センターによれば、結晶性シリカはアスベストと同じく「人体への発癌性の恐れ有り(グループI)」に区分。もみ殻から高純度の非晶質シリカを抽出するには、焼成前に有機成分の除去とアルカリ金属不純物の除去が不可欠であるhttps://t.co/EbHpekWOlR

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