In a APE- Fluid Bed Dryer, to dry the materials a perforated bed of moist solid particles is passed through by hot, high-pressure air. Particles start to suspend in the air because hot air travels at a speed greater than their speed of settling. The moisture content of solid particles decreases when the moist particle suspends in heated air to produce the appropriate loss on drying (LOD). Away from the moist solid particles, the vaporized liquid is carried by the drying vapors. In some cases, the leaving gas is recycled to conserve energy.