Patent ID: 8529690

Claim:
A process for controlling a crystal form of Alite in Portland cement clinker, wherein the method comprises: (1) calcining prepared Portland cement raw meal to form a cement clinker, the calcining comprising; (2) increasing the temperature of the Portland cement raw meal at a rate of 1-35° C. per min to a first temperature of 1400-1600° C.; holding the temperature at the first temperature; and naturally cooling the formed cement clinker; heat treating cement clinker after the temperature of the cement clinker is reduced from the first temperature to 600-800° C., the heat treatment comprising: heating the cement clinker at a rate of 1-35° C. per minute until the cement clinker reaches a second temperature of 700-1300° C.; holding the temperature of the cement clinker at the second temperature; and naturally cooling the cement clinker; and grinding the cement clinker after cooling from the second temperature.