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
The objective of the present work is to develop a green procedure for preparation of silica powders fromrice husk ash (RHA) via a carbonation route. The raw materials, RHA and waste gas, were obtained fromthe power plant. Na2CO3 was used as the silica extraction reagent and waste gas was the precipitator. Thesilicon dioxide extraction yield reached 72.52% and was affected by impregnation ratio, concentrationof Na2CO3 solution and reaction time. The microstructures of the as-obtained silica powders were characterizedby X-ray diffraction (XRD) and infrared spectra (IR). The mineral contents of RHA and productwere investigated by inductively coupled plasma (ICP) emission spectroscopy. In the whole silica extractionprocess, extraction reagent can be reused through appended a small quantity of Na2CO3 to its initialconcentration. The synthetic procedure is straightforward, inexpensive and environment-friendly, whichwas suitable for large-scale production
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