Hydraulic cement process

Claim 1

A PROCESS FOR THE PRODUCTION OF HYDRAULIC CEMENT FROM RELATIVELY FINE, RAW, UNCALCINED, CARBONATE-CONTAINING, CEMENT-FORMING MATERIALS WHICH COMPRISES ESTABLISHING A BED OF RELATIVELY COARSE FLUIDIZED PARTICLES PREDOMINANTLY OF A CHEMICAL COMPOSITION SUBSTANTIALLY THE SAME AS THE HYDRAULIC CEMENT TO BE PRODUCED, MAINTAINING SAID BED IN A FLUIDIZED STATE BY CHARGING GAS INTO THE BOTTOM PORTION THEREOF, CALCINING AT LEAST THE MAJOR PORTION OF THE CARBONATE CONTENT OF THE RAW CEMENT-FORMING MATERIALS, CHARGING THE RAW CEMENT-FORMING MATERIALS, INCLUDING THE CALCINED PRODUCT, IN POWDERED FORM INTO SAID BED OF FLUIDIZED PARTICLES, RAISING THE TEMPERATURE OF SAID RAW CEMENT-FORMING PARTICLES IN THE BED TO THE CEMENT-FORMING REACTION TEMPERATURE, WHEREBY THE RAW CEMENT-FORMING