Process for the heat treatment of material in dust form

A process for the heat treatment of components of a raw material in dust form so as to produce cement clinkers in an installation comprising a first and a second heat exchanger for preheating the raw material, a rotary kiln supplied with the combined preheated material from said heat exchanger, and a condenser for cooling the material delivered from said kiln, said process comprising the steps of:

• 1.
• a. supplying a first component of the raw material to said first heat exchanger;
• b. supplying a second component of the raw material to said second heat exchanger;
• 2.
• a. supplying waste gases from said rotary kiln to said first heat exchanger for heating the raw material component therein;
• (b) supplying waste gases from said condenser to said second heat exchanger;
• (c) supplying additional fuel to a burner in said second heat exchanger;
• d. conveying the heated first raw material component from said first heat exchanger into said heated second heat exchanger for admixing with said second raw material component and the waste gases from said condenser;
• (e) subjecting said admixed raw material components and condenser waste gases to heat from said burner;
• and
• 3. carrying out substantially all endothermal process in said second heat exchanger with said admixed raw material components while producing in said rotary kiln only the heat quantity necessary for reaching and maintaining the process temperature.