Influence of Inherent Silicon and Metals in Rice Husk on the Char Properties and Associated Silica Structure

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• 作者：Haiping Yang ; Biao Liu ; Yingquan Chen ; Bin Li ; Hanping Chen
• 刊名：Energy & Fuels
• 出版年：2015
• 出版时间：November 19, 2015
• 年：2015
• 卷：29
• 期：11
• 页码：7327-7334
• 全文大小：652K
• ISSN：1520-5029

文摘

To obtain high-purity amorphous silica from rice husk char through heat treatment, the distribution of silica and other metallic species in this char and their effects on char combustion reactivity were investigated. The pore properties, crystal structures, and particle sizes of rice husk chars and ashes were analyzed. It was observed that an embedded structure mixing amorphous silica and carbon existed, and its size may be 1鈥?0 nm. This structure may protect the amorphous property of silica during heat treatment. The inherent metallic species were also distributed in the pore size range of 1鈥?0 nm; furthermore, these species accelerated the burnout rate and the crystallization of amorphous silica above 1000 掳C.