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Low-temperature preparation of belite from lime sludge and nanosilica through solid-state reaction

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Abstract

Belite or β-dicalcium silicate (β-C2S, Ca2SiO4), one of the main compounds in Portland cement clinker, is conventionally produced by sintering beyond the temperature of 1,200 °C using limestone and quartz. This study is aimed to synthesis belite from lime sludge, a residual solid waste from paper and pulp industry, with nanosilica at relatively low temperature through solid-state reaction. The precursors and synthesized final products are characterized using TG–MS–DTA, FTIR, XRD, SEM, TEM/EDAX and BET analysis. It is observed that the thermal process toward the formation of belite of mechanically activated dissimilar-sized precursors reduced the sintering temperature of the reaction significantly and belite is obtained without the use of any chemical stabilizers and calcination of lime sludge.

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Acknowledgements

The scientists and staff members of CSMG of CSIR-SERC are greatly acknowledged for the useful discussions and suggestions provided during the course of the investigations. This paper is being published with the kind permission of the Director, CSIR-SERC, Chennai, India.

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Correspondence to S. Maheswaran.

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Maheswaran, S., Kalaiselvam, S., Arunbalaji, S. et al. Low-temperature preparation of belite from lime sludge and nanosilica through solid-state reaction. J Therm Anal Calorim 119, 1845–1852 (2015). https://doi.org/10.1007/s10973-014-4371-5

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  • DOI: https://doi.org/10.1007/s10973-014-4371-5

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