METHOD AND APPARATUS FOR HEAT TREATING FINE-GRAINED PRODUCTS

摘要

Find-grained material adapted to be fired in a rotary tube furnace is preheated by being introduced to a vertical chamber in which there is a heating zone at a level lower than that at which the material enters the chamber. Prior to reaching the heating zone fuel is added to the material, after which the material is broken up and subjected to firing at the heating zone. The material thus heated is delivered to the furnace for final firing.