Patent ID: 7651547
Filing Date: 2010-01-26
Classification: B01J,C21B,C22B,F27B,Y02P

Abstract:
1. A method for the heat treatment of solids containing titanium, in which fine-grained solids are treated at a temperature of 700 to approximately 950° C. in a fluidized bed reactor, comprising introducing the solids into the reactor, introducing a first gas or gas mixture from below through at least one gas supply tube into a mixing chamber of the reactor located above the upper orifice region of the gas supply tube, the gas supply tube being at least partly surrounded by a stationary annular fluidized bed which is fluidized by supplying fluidizing gas, wherein the gas flowing through the gas supply tube entrains solids from the fluidized bed into the mixing chamber when passing through the upper orifice region of the gas supply tube, and adjusting the gas velocities of the first gas or gas mixture as well as of the fluidizing gas for the annular fluidized bed such that the particle Froude numbers in the gas supply tube are between 1 and 100, in the annular fluidized bed between 0.02 and 2 and in the mixing chamber between 0.3 and 30, and moving the treated solids from the reactor.