I. Introduction
Coal gangue (CG) is one of industrial solid wastes with biggest discharging. It is come from when coal is excavated and washed in the production course [1]. CG has been the biggest wastes in China. The disposal of such a large quantity of this solid waste requires lots of land and many serious environmental problems have been occurred [2], [3]. How to recycle the CG and improve the quantity of recycled resources have become very important to our environment. Its major chemical composition is SiO2 and Al2O3, and its major mineralogical composition is quartz and kaolinite and so on. One kind of effective method is used widely the waste as one of cement raw materials for product Portland cement.