The paper deals with investigations and modelling of the batch drying process of solids in a fluidized bed apparatus. A model of fluidized bed drying has been used, which consists of two zones: emulsion zone and bubble zone with the presence of solid particles in bubbles. The results of theoretical expectations arising from simulation calculations have been verified using experimental data obtained in the fluidized bed dryer of 0.225 m in diameter. A drying process of silica-gel, sand and ammonium sulphate has been tested.