The data on physical modeling of fluidized bed furnaces for roasting of copper concentrate from matte separation are presented. On the basis of observance of similarity criteria, a physical model of fluidized bed furnace is constructed to study the properties of fluidized bed and the influence of various factors on its properties. The influence of introducing a fluidizing agent into the blowing box on the non-uniformity of fluidization of the material in the furnace has been studied.