Abstract: A heating and drying apparatus for powdery or granular materials, including a hollow column consisting of an upper disaggregation heat-exchange chamber having a plurality of baffle plates disposed therein arrayed in multiple stages with gap spaced retained between the adjacent baffle plates in the vertical and horizontal directions and a lower fluidized state heat-exchange chamber connected in series wth the upper chamber, a feeder of a material to be treated and an exhaust gas outlet port, both provided at the top portion of the upper chamber, and a heating gas inlet port and a treated material discharge device, both provided at the bottom portion of the lower chamber.