Optimizing the thermal treatment of Abeokuta kaolin (south-west Nigeria) for production of natural pozzolan

Olasunkanmi A. Adekitan and Gbenga M. Ayininuola

African Journal of Science, Technology, Innovation and Development, 2017, vol. 9, issue 4, 361-365

Abstract: The use of pozzolans in construction works have been on the rise in recent times, an effort driven by the need for environmentally friendly alternatives to cement. Calcined kaolin is a natural pozzolan currently being researched and optimum pozzolanic performance has been related to its production parameters. This work investigated the optimum calcining temperature and time for a kaolin source located in Ajebo, south-west Nigeria, using the degree of de-hydroxylation (Dtg) as a measuring parameter. Preliminary DTA revealed that the formation phase was between 500°C and 750°C. Using this result as a reference, the kaolin samples, each 300 gm, were thereafter calcined at temperatures of 550°C, 600°C, 650°C, 700°C, 750°C and 800°C, respectively, each for 1 hr and 2 hrs in an electric muffle furnace. At each instance, Dtg was obtained as the mass loss calculated as a percentage of the original mass. The process was repeated two more times and averages were calculated. Results showed that Dtg peaked at the 750°C-1 hr combination (0.95), whereas marginal differences were recorded at some lower temperatures (0.91 for 650°C-2 hrs; 0.91 for 700°C-1 hr; 0.93 for 700°C-2 hrs). The paper concludes by advising on these temperature-time combinations for optimum calcining of Ajebo kaolin.

Date: 2017
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DOI: 10.1080/20421338.2017.1322351

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