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Extraction of Silica from Burned Paddy Husk Ash

Pavan P. Gawai

Abstract


Rice husk is Agricultural waste product which is used for the burning as fuel. Rice husk use to generate energy, after burning as result the waste product is called as the rice husk ash (RHA). RHA is abundant Agricultural by-product. It contains high amount of silica (about 60 to 70 %) and it can be economically and easily available as raw material, which is to be used for the production of silica gels and powders. This present work concerns with the production of silica gels by acid base treatment method. Firstly acid washing is done for the extraction process, in result silica contains with a low concentration of the minerals. To form precipitation of silica gels was done using Hydrochloric acid solution. This present work shows the effect of the different PH on the production efficiency of Silica gels. This method based on extraction which is achieve by developing acid precipitation to produced pure silica gels from the RHA, with the minimal contaminants of minerals. This chemical process not only give solution for rice husk waste disposal problems but also it  recovers the valuable silica product with contain useful associate recoveries. The sample is then characterized by colorimeter. PH of product with absorption range of silica.

Keyword: Colorimeter, Drying, Extraction, Filtration, Rice Husk Ash, Silica Gels


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References


studies of processed rice hull silica. J. Am. Oil Chem. Soc. 67,

±584.Anon. 1997.Soluble Silicates and their Applications.Cross®eld

Publication, Cross®eld, Warrington, UK, Issue No. 2.

AOAC, 1990. Ocial Methods of Analysis, 15th ed. Association of

Analytical Chemists, Washington, DC.

Brinker, C.J., Scherer, G.W., 1990. Applications. In: Sol±Gel Science,

The Physics and Chemistry of Sol±Gel Processing. Academic Press,

San Diego, CA, pp. 839±880.

Chakraverty, A., Kaleemullah, S., 1991. Conversion of rice husk into

amorphous silica and combustible gas. Energy Consers. Mgmt. 32,

±570.

Iler, R.K., 1979. Silica gels and powders. In: Iler, R.K. (Ed.), The

Chemistry of Silica.Wiley, New York, pp. 462±599.

Kamath, S.R., Proctor, A., 1998. Silica gel from rice hull ash:

preparation and characterization. Cereal Chemistry 75, 484±487.

Krishnaro, R.V., Godkhindi, M.M., 1992. Distribution of silica in ricehusk and its e€ect on formation of silicon carbide. Ceramics Intl.

, 243±249.

Laxamana, N.B., 1982. Binders from rice hull ash low-cost housing

materials. Forbride-Dig. College: Forest Products Research and

Industries Development Commission 11, 27±30.

Lender, P.W., Ruiter, R., 1990. Novel inorganic materials and

heterogeneous catalysis: preparation and properties of high surface

Mizuki, E., Okumura, S., Saito, H., Muro, S., 1993. Formation of

silicon carbide from rice husks using enzymatic methods for carbon

control. Biores.Technol. 44, 47±51.

Proctor, A., 1990. X-ray di€raction and scanning electron microscope

Proctor, A., Clark, P.K., Parker, C.A., 1995. Rice hull ash adsorbent

performance under commercial soy oil bleaching conditions.

J. Am. Oil Chem. Soc. 72, 459±462.

Proctor, A., Palaniappan, S., 1990. Adsorption of soy oil free fatty

acids by rice hull ash. J. Am. Oil Chem. Soc. 67, 15±17


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