Clinkers for ordinary Portland cement and white as well as colored cements were prepared by
microwave processing. The results show that microwave processing enhanced the clinkering
reaction to certain extent on both ordinary and white cements. The microwave enhancement
was manifested by the lowered clinkering temperatures. The iron oxide in the ordinary cement
raw meal and amorphous silica in the white cement samples are believed to be responsible for
the microwave enhancing effects.