1. Compared with conventional electric heating, the new
method of combining conventional electric heating with
microwave heating is more efficient, and the speed of mineral formation is also faster. After being heated to a
low electric heating temperature (1000–1100 C) and then
promoted with microwave burning in 1–2 min, Portland
cement clinkers could be formed.
2. The mineral composition of Portland cement clinkers
with this method is similar to that of the clinkers with
conventional method. Their XRD peaks of minerals are
similar too.
3. When Fe2O3 was mixed, the microwave absorption
ability of the raw meals can be increased, and the burning
temperature and microwave heating time can be decreased.
4. It seems that powdered samples are easier to burn than
piece samples when the combined heating method is adopted.