Abstract
The effects of kiln atmosphere on a low-maturing shale and a moderately refractory fireclay fired in a pilot shuttle kiln using natural gas were studied. Bricks were fired in both oxidizing and reducing atmospheres, with emphasis on variable water vapor concentrations. The chemical and physical benefits of proper atmosphere selection and control are shown. Kiln atmosphere influenced absorption, shrinkage, strength, scumming, lime popping, frost resistance, and temperature uniformity. Results indicate that firing techniques with rapid schedules and significant reductions in maturing temperatures are feasible without sacrificing product quality.
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