Property Optimization of Kaolin - Rice Husk Insulating Fire - Bricks
Journal Title: Leonardo Electronic Journal of Practices and Technologies - Year 2006, Vol 5, Issue 9
Abstract
In this work, the suitability of using Kaolin - Rice husk - plastic clay to produce insulating firebrick was experimentally investigated and the optimal ratio of these constituents determined. Ten brick samples of different compositions were fired at a temperature of 1200ºC. Three of the samples (samples 6, 7, and 8) crumbled during firing. The surviving samples gave the following limits of results: - shrinkage: 9.7% - 13.6%; effective moisture content: 28.34% - 32.52%; modulus of rupture: 4.26kgf/cm2 - 19.10kgf/cm2; apparent porosity: 56% - 95.93%; water absorption: 42.27% - 92.12%; bulk density: 1.04g/cm3 - 1.41g/cm3; apparent density: 2.56g/cm3 - 5.77g/cm3; and thermal conductivity: 0.005W/mK - 0.134W/mK. The results showed that they all had good insulating characteristics. Samples 1 - 5 and 10 showed good level of refractoriness, while mixing ratio of 4:1:2 (representing weight in grams of Kaolin, plastic clay and rice husk respectively) for sample 4 gave the optimum performance values in terms of refractoriness, thermal conductivity, modulus of rupture, shrinkage and bulk density and the effective moisture content.
Authors and Affiliations
Benjamin UGHEOKE, Emmanuel ONCHE, Oliver NAMESSAN, Gabriel ASIKPO
Keywords
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