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Research Article

Improving the Physical and Thermal Properties of the Fire Clay Refractory Bricks Produced from Bauxite

Mazen Al-Amaireh
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In this study chemical and mineralogical tests were carried out on the bauxite mineral in order to assess its suitability for the production of refractory bricks. Two types of additives were used, white Kaolinite as a binding material in ratios of 10, 15 and 20% and the chemical additives synthetic alumina in ratios of 10, 20, 30, 40, 50 and 60% for the purpose of improving the general characteristics of the bauxite bricks. Due to the low plasticity of bauxite grains, the semi-dry pressing was used at a forming pressure of 40-45 N m-2 with added water ratio of 9-12% in addition to 0.5% of molasses as a binder. The formed samples were of cylindrical shape (50x50 mm) for diameter and height. The drying process of the samples was carried out over a wide range of temperatures up to 110°C with a soaking time of 2 h. The general characteristics for the samples was determined under the optimum conditions achieved in this study. The optimum conditions were: Best forming pressure 45 N mm-2; best firing temperature 1550°C and soaking time 2 h; best bauxite ratio 70% fired bauxite and 10% non fired bauxite; best grain graduation for the bauxite fired as raw material was consisting of 45% coarse, 10% medium and 45% fine. The validity of the samples was tested after firing and the results were compared with the international standards for this type of refractory bricks. It has been proved their suitability for the lining of rotary kilns used in the cement industry.

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  How to cite this article:

Mazen Al-Amaireh , 2006. Improving the Physical and Thermal Properties of the Fire Clay Refractory Bricks Produced from Bauxite. Journal of Applied Sciences, 6: 2605-2610.

DOI: 10.3923/jas.2006.2605.2610


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