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Conversion of Coal Prep-Wastes into Portland Cements

A developmental project was carried out to explore the potential for the economic use of coal-prep waste. Coal prep-wastes were used as a component of raw feed in producing portland cement clinker. Several combinations of prep-wastes, and cement kiln dust and raw materials from different Illinois cement plants were tested in the laboratory to generate clinkers. The raw mixes were fired at 1400 o C as compared to 1450 o C usually required for commercial clinker production. The clinkers were ground to cement fineness and were blended with an equal portion of ordinary portland cement to produce test cement samples for evaluation. When tested for compliance with ASTM C 150 specification, these cements showed properties comparable with those of commercially produced cements.