Journal
CHEMICAL ENGINEERING JOURNAL
Volume 162, Issue 2, Pages 509-514Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2010.05.052
Keywords
Rice husk ash; Na2CO3; Carbonation route; Silica powders
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Funding
- Key Project of the National Eleventh Five-Year Research Program of China [2008BAE66B00]
- Scientific and Technological Planning Project of Jilin Province [20075009]
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The objective of the present work is to develop a green procedure for preparation of silica powders from rice husk ash (RHA) via a carbonation route. The raw materials, RHA and waste gas, were obtained from the power plant. Na2CO3 was used as the silica extraction reagent and waste gas was the precipitator. The silicon dioxide extraction yield reached 72.52% and was affected by impregnation ratio, concentration of Na2CO3 solution and reaction time. The microstructures of the as-obtained silica powders were characterized by X-ray diffraction (XRD) and infrared spectra (IR). The mineral contents of RHA and product were investigated by inductively coupled plasma (ICP) emission spectroscopy. In the whole silica extraction process, extraction reagent can be reused through appended a small quantity of Na2CO3 to its initial concentration. The synthetic procedure is straightforward, inexpensive and environment-friendly, which was suitable for large-scale production. (C) 2010 Published by Elsevier B.V.
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