Investigation of thermo-mechanical and refractory properties of aluminosilicate ramming mass across rotary furnace lining
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The effect of sintering temperature on the properties of aluminosilicate ramming mass was investigated. Two refractory compositions, namely clay – silica – mica – bentonite (80 – 10 – 20 – 4) and clay – silica – mica – Durax (80 – 10 – 20 – 4), were investigated. Each of these compositions was thoroughly mixed in a laboratory sand mixer using 5% tempering water. Moulded samples of ∅50 mm x 50 mm height were then prepared from them using the AFS standard ramming machine. The samples were dried at 120°C for 110 min. These samples were fired at different temperatures of 1000, 1100, 1200, 1300, 1400, and 1500°C. The fired samples were thereafter tested for such properties as apparent porosity, cold compression strength, linear shrinkage, volumetric firing shrinkage, thermal shock resistance, and refractoriness at these temperatures. The results obtained indicated that the rise in cold compression strength for all samples with increasing temperature reaches a maximum before failure at the refractoriness point of 1500°C. The apparent porosity and volumetric shrinkage decrease with increasing temperature. At all temperature ranges, the materials exhibit excellent thermal shock resistance. These compositions are therefore recommended for lining of rotary furnaces for melting of cast iron.
Keywordsaluminum-silicate ramming mass sample firing temperature properties definition
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