FIELD: equipment for thermal treatment of granular materials in a fluidized bed, applicable in non-ferrous metallurgy and in production of building materials. SUBSTANCE: the furnace has a body, loading and unloading devices, gas-distributing lattices and chambers separated from one another by a partition with a transfer in the form of a duct containing the gas-distributing devices located between its upper edge and the upper edge of the transfer opening. The outlets are oriented to the flow. The gas-distributing devices are provided with branch pipes. The unloading device may be installed in the lower part of the chamber. EFFECT: enhanced quality of material and reduced loss due to a decrease of hydrolysis. 2 cl, 3 dwg
