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Effect of calcination temperature and heating rate on the optical properties and reactivity of rice husk ash

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Abstract

Rice husk is an agricultural waste and its conversion to value added products makes it a secondary resource material. On heating, rice husk gives ash with >90% by weight of silica with some carbon and other nonmetallic and metallic impurities. Silica of high purity, chemical reactivity and white color can be produced from rice husk by controlling the heating conditions and this material finds wide industrial applications. Properties of the ash depend upon various pretreatments and calcination conditions. The present work deals with the investigation on a rice husk sample from the state of Andhra Pradesh in India. The raw husk and its acid treated form were calcined at different conditions such as temperatures, soaking periods and heating rates. Lime reactivity, surface area, brightness and color values of the ash samples were measured. The high potassium content in the husk has been found to inhibit the carbon removal during ashing which affected the color as well as reactivity of the ash. Properties of the ash samples from the untreated and acid treated husk have been compared and correlated with the formation conditions.

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Acknowledgements

The authors are grateful to the Director, Regional Research Laboratory, Thiruvananthapuram for giving permission to communicate this work. Thanks are also due to Mr. S. Ramaswamy, Mr. P. Guruswamy, Mr. K.M. Prakash and Mr. Veluswamy for AAS, XRD, surface area measurements and for carbon analysis. One of the authors (PNP) is indebted to CSIR (Govt. of. India) for financial assistance.

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  1. Regional Research Laboratory (CSIR), Thiruvananthapuram, 695 019, India

    Sathy Chandrasekhar, P. N. Pramada & Jisha Majeed

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  1. Sathy Chandrasekhar
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  2. P. N. Pramada
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  3. Jisha Majeed
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Correspondence to Sathy Chandrasekhar.

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Chandrasekhar, S., Pramada, P.N. & Majeed, J. Effect of calcination temperature and heating rate on the optical properties and reactivity of rice husk ash. J Mater Sci 41, 7926–7933 (2006). https://doi.org/10.1007/s10853-006-0859-0

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  • DOI: https://doi.org/10.1007/s10853-006-0859-0

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