抄録
Waste coal fly ash, industrial waste dumped from power plants, is usually disposed of by burying it, but if it is recycled to lightweight aggregate, it can be reused as a resource and also environmental pollution can be reduced. This study proposes making waste coal fly ash from anthracite and bituminous coal into lightweight aggregates. During the manufacturing of lightweight aggregates, appropriate sintering temperature and heating velocity were 1260°C and 70°C/min respectively. The addition of 10% of pulverized coal produced lighter and less absorptive aggregates than original coal fly ash samples, and heating velocity proved a more critical factor than sintering time. Coal fly ash from bituminous coal proved to be more appropriate material for the manufacturing of the lightweight aggregate than that from anthracite coal, since the former has superior bloating characteristics on account of its comparatively higher proportion of SiO2 to A12O3. When 3% of calcium carbonate is added to the sample, more pores were developed, thus helping manufacture a more effective and lighter aggregate. The lightweight aggregate manufactured under the optimum conditions shows considerably excellent physical characteristics.
