Method and apparatus for heat treatment of fine-grained solids

The present invention relates to a method for heat treatment of solids, particularly for the thermal dissociation of salts, in which the solids in a reactor (1) heated to a temperature of 200 to 1400 ° C and the fluidized bed, and a corresponding system. To improve the energy utilization, and the salt-splitting, a first gas or gas mixture from below through a preferably central gas supply tube (3) into a mixing chamber (7) of the reactor is proposed to introduce (1), wherein the gas supply tube (3) at least partially from a is fluidized by supplying fluidizing gas, stationary annular fluidized bed (10) is surrounded, and the gas velocities of the first gas or gas mixture and of the fluidizing gas for the annular fluidized bed (10) are adjusted such that the particle-Froude numbers in the gas supply tube (3) is between 1 and 100, be in the annular fluidized bed (10) from 0.02 to 2 and in the mixing chamber (7) from 0.3 to 30.