Use of animal by-products for cement production

A cement clinker, comprising:

• about 10-90 weight percent calcium sulfoaluminate;
• about 5-50 weight percent tricalcium phosphate;
• about 0-75 weight percent calcium aluminates;
• and
• about 0-25 weight percent minor phases including at least one of anhydrite calcium sulfate, hydroxyapatite and free lime.

A process for producing a cement clinker, comprising:

• preparing a raw meal of about 20-70 weight percent calcium oxide, about 0-15 weight percent silicon dioxide, about 20-70 weight percent aluminum oxide, about 0-15 weight percent iron oxide, about 2.5-35 weight percent sulfur trioxide, about 0-5 weight percent magnesium oxide, about 0-5 weight percent sodium oxide, and about 0-50 weight percent phosphorus pentoxide;
• compacting and forming pellets from the raw meal;
• calcining the pellets at about 900-1,000° C. for about 15-120 minutes;
• clinkering the pellets at about 1,100-1350° C. for about 15-120 minutes to produce clinkered pellets;
• and
• quenching the clinkered pellets in air.