In the glazing process for gypsum heat treatment, the material is dewatered in a fluidized bed in a fluidized bed process and passed through at least a single fluidized catalyst bed zone. The partial lump of water vapor is measured in a fluidized bed catalyst zone or calculated from the humidity and amount of starting material and the amount of fluidizing gas introduced. Further, the temperature of the material is measured in the fluoridated catalyst bed or in the moisture and volume of the starting material and the amount of fluid introduced into the fluid. Finally, the water vapor heat conduction is set as a function of the measured or calculated partial water vaporization, and the material temperature, depending on the measured material temperature, is adjusted to produce a phase-pure beta-half hydrate at the outlet of the fluidizer. The apparatus has a clay inlet and a single product outlet. Further, there is a multi-partition wall built into the Fluid bed, which slides the Fluid bed into several chambers arranged one behind the other, and is provided with openings for flow of material from one chamber to the next. All the fluid beds in the chamber have heat exchangers, and finally each chamber has heat inlet for the fluidizing gas. Each chamber (5,6,7) has a water vapor heat outlet (25,26,27), a single temperature sensor (35,36,37) and a measuring device (38,39,40) for measuring the partial displacement of the water vapor. Control loops are used to control the temperature of the respective chamber heat exchangers (13, 14, 15) and / or the temperature of the fluidizing gas. ŕ
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