Production of Activated-Belite-CSA Clinkers at Extremely Low Firing Temperature

A cement clinker, comprising:

• about 40-70 weight percent hydraulically active belite polymorph;
• about 10-35 weight percent ye'elimite;
• and
• about 0-30 weight percent of at least one minor phase selected from a group consisting of beta-belite, gamma belite, alpha′L-belite, tricalcium aluminate, ferrite, tetracalcium aluminoferrite, mayenite, fluorellestadite, fluormayenite, ternesite, gehlenite, krotite, alite, anhydrite, perovskite and free lime.

A process for producing a cement clinker, comprising:

• preparing a raw meal of about 45-57 weight percent calcium oxide, about 15-25 weight percent silicon dioxide, about 9-18 weight percent aluminum oxide, about 0.5-5 weight percent iron oxide, about 2-8 weight percent sulfur trioxide, about 0.2-3 weight percent calcium fluoride, about 0.2-4 weight percent sodium oxide and about 0.5-5 weight percent boron oxide;
• compacting and forming pellets from the raw meal;
• calcining the pellets at about 900-1,000° C. for about 15-60 minutes;
• clinkering the pellets at about 1,000-1300° C. for about 15-60 minutes to produce clinkered pellets;
• and
• quenching the clinkered pellets in air.