MODEL FOR PREDICTING MIX FORMULATION IN THE PRODUCTION OF INSULATING REFRACTORY BRICKS USING NIGERIAN FIRE-CLAYS AND COCONUT SHELL
Keywords:Refractory, Coconut shell, empirical model, porosity and thermal conductivity.
Lack of appropriate mix formulation has the tendency to degrade the strength of refractory bricks. This paper presents a model developed for evaluation and prediction of mix formulation for production of insulating refractory using Osiele and Ukpor fireclays blended with coconut shell particulates. The chemical compositions of the raw materials were analysed. The samples were prepared by mixing the clays and coconut shell of grain sizes 212 - 600µm. Then air and oven dried for 24 hours at room temperature and at 110oC respectively. Thereafter, sintered at temperatures between 950 to 1200oC at 50oC interval. The samples were tested for various properties. From the results, an Empirical Model relating the Composition and Property of the bricks was developed. . The results of the model show the trend similar to experimental. Deviational analysis conducted indicates that the deviation of model-predicted data from the experimental is between 2.25 – 8.9%hence, 91- 97% accuracy.
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