A simple method for production of pure silica from rice hull ash

A simple method for production of pure silica from rice hull ash

Rice hull ash (RHA), a waste product of the rice industry is rich in silica. A simple method based on alkaline extraction followed by acid precipitation was developed to produce pure silica xerogels from RHA, with minimal mineral contaminants. The silica gels produced were heated to 80 oC for 12 h t...

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Veröffentlicht in:Bioresource technology 2000-07, Vol.73 (3), p.257-262
Hauptverfasser: Kalapathy, U., Proctor, A., Shultz, J.
Format: Artikel
Sprache:eng
Schlagworte:
Calcium
Emission spectroscopy
Energy dispersive spectroscopy
Extraction
Fourier transform infrared spectroscopy
Heat treatment
Hulls (seed coverings)
Minerals
pH effects
Precipitation (chemical)
Rice hull ash
Silica gel
Silica xerogels
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Zusammenfassung:Rice hull ash (RHA), a waste product of the rice industry is rich in silica. A simple method based on alkaline extraction followed by acid precipitation was developed to produce pure silica xerogels from RHA, with minimal mineral contaminants. The silica gels produced were heated to 80 oC for 12 h to obtain xerogels. Silica and mineral contents of xerogels were determined by energy dispersive X-ray (EDX) and inductively-coupled plasma (ICP) emission spectrometers, respectively. Xerogels produced from RHA had 93% silica and 2.6% moisture. The major impurities of silica produced from RHA at an extraction yield of 91% were Na, K, and Ca. Acid washing prior to extraction resulted in silica with a lower concentration of Ca (
ISSN:0960-8524
1873-2976
DOI:10.1016/S0960-8524(99)00127-3