Recycling Coal Gangue as Raw Material for Portland Cement Production in Dry Rotary Kiln

Coal gangue (CG) is one of industrial solid wastes with biggest discharging. The disposal of such a large quantity of this solid waste requires lots of land and many serious environmental problems have been occurred. In this paper, CG as one of cement raw materials, and production experiments were performed in a 5000t-d^-1 dry process rotary kiln to calcinations Portland cement clinker. The thermo gravimetric analyses, ash melting point test, X-ray diffraction (XRD), chemical composition of CG were measured. Utilization CG as clay for cement raw meal preparations, and a study was done for calcinations clinkers and test their performance and so on. The results revealed that CG can replace clay for Portland cement. The average output of clinker per day was increased 8.23%, and the usage of the standard coal was decreased 3.94%. The technology reference provide for CG can widely use in cement industry.