https://scholars.lib.ntu.edu.tw/handle/123456789/61402
標題: | Characterization of Ca(OH)2/fly ash sorbents for flue gas desulfurization | 作者: | Lin, Ren-Bin Shih, Shin-Min |
關鍵字: | flue gas desulfurization;Ca(OH)(2);fly ash;structural properties;pollution control | 公開日期: | 2003 | 出版社: | Taipei:National Taiwan University Dept Chem Engn | 起(迄)頁: | 212-222 | 來源出版物: | POWDER TECHNOLOGY 131(2-3) | 摘要: | Ca(OH)2/fly ash sorbents prepared by varying the Ca(OH)2/fly ash weight ratio (CH/FA) and the slurrying time at 65 jC and a water/solid ratio (L/S) of 10:1 were characterized to study the influence of the preparation variables on their physical properties and chemical compositions. The pozzolanic reaction between Ca(OH)2 and fly ash taking place in slurry resulted in the formation of calcium silicate hydrates (CSHs) (C–S–H(I)), which, having shapes of foil, plate, and sphere, tended to cause particles to cohere and to form a porous structure. Particles formed by foils of calcium silicate hydrates were compressible under high pressures. The reaction was rapid before 1 h and abruptly slowed down thereafter due to the covering of fly ash particles by calcium silicate hydrates; but the structure of calcium silicate hydrates continued to change with slurrying time, hence more pore volume and surface area were generated. Pores in the sorbents were mainly in the mesopore range and slit-shaped. The particle sizes, specific surface areas, and pore volumes of the sorbents, being larger than those of Ca(OH)2 or fly ash alone, changed with Ca(OH)2/fly ash weight ratio. The sorbent with a ratio of 70:30 had the largest specific surface area, mesopore volume, and micropore volume. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/2006111501233354 | 其他識別: | 246246/2006111501233354 |
顯示於: | 化學工程學系 |
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