A PROCESS AND AN APPARATUS FOR THE HEAT-TREATMENT OFFINE-GRAINED MATERIAL

摘要

The invention relates to a process and an installation for the heat-treatment of fine-grained material. Before the material is introduced into a precalcination zone, waste air from a cooling zone is divided into two component streams into which partial quantities of material coming from the two preheating zones are introduced. Separately measurable quantities of fuel are added to these two component streams before they are combined with one another. In this way, the material is maximally deacidified in the precalcination zone before it is introduced into the calcining zone without any danger of deposits being formed in the precalcination zone.