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Production of metakaolin from industrial cellulose waste

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Abstract

Research focused on the transformation and utilization of industrial wastes into products of commercial interest plays an increasingly important role. Residual pulp can become useful in the manufacture of different materials, providing high value to this waste and reducing its environmental impact when disposed of improperly in the environment. The main constituents of this waste are kaolin and calcium carbonate (CaCO3). Starting from kaolin, metakaolin can be produced by calcination of the residue at 630 °C for 2 h in a rotary reactor with air flow, followed by solubilization with hydrochloric acid to remove the CaCO3. The development of technological alternatives aimed at the reuse of certain wastes can result in applications of real economic interest to the chemical industry and ceramics and glass, which is the case in this study. The raw material and metakaolin obtained were analyzed by thermogravimetric analysis and derivative thermogravimetric analysis, X-ray diffraction, and X-ray fluorescence spectroscopy with promising results. This is because metakaolin was obtained free of contamination by other materials.

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Acknowledgements

We acknowledge the Instituto de Pesquisas Ambientais e Tecnológicas (IPAT/UNESC) for the equipment used in this work; the Tractebel Energia/Agência Nacional de Energia Elétrica (ANEEL) and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES).

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Correspondence to Carolina Resmini Melo.

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Melo, C.R., Angioletto, E., Riella, H.G. et al. Production of metakaolin from industrial cellulose waste. J Therm Anal Calorim 109, 1341–1345 (2012). https://doi.org/10.1007/s10973-011-1892-z

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  • DOI: https://doi.org/10.1007/s10973-011-1892-z

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