FLUIDIZED BED METHOD AND PLANT FOR THE HEAT TREATMENT OF SOLIDS CONTAINING TITANIUM

摘要

The present invention relates to a method and a plant for the heat treatment of solids containing titanium and possibly further metal oxides, in which fi ne- grained solids are heated to a temperature of 700 to 950 ~C in a fluidized b ed reactor (1). To improve the energy utilization, it is proposed to introduce a first gas or gas mixture from below through a gas supply tube (3) into a mixing chamber (7) of the reactor (1), the gas supply tube (3) being at leas t partly surrounded by a stationary annular fluidized bed (10) which is fluidized by supplying fluidizing gas. The gas velocities of the first gas o r gas mixture as well as of the fluidizing gas for the annular fluidized bed (10) are adjusted such that the particle Froude numbers in the gas supply tu be (3) are between 1 and 100, in the annular fluidized bed (10) between 0.02 an d 2 and in the mixing chamber (7) between 0.3 and 30.