PROCEDURE AND PLANT FOR HEAT TREATMENT OF SULFIDIC LESS USING AN ANNULAR FLUIDIFIED MILK.

摘要

A process for the heat treatment of sulfide ores in particular, in which finely granulated solids are treated at a temperature of 450 ° C to about 1500 ° C in a fluidized bed reactor (1), in which a first gas or gas mixture it is introduced from below through a preferably central gas supply tube (3) into a mixing chamber (7) of the reactor (1), the gas supply tube being at least partially surrounded by a fixed annular fluidized bed ( 35) which fluidizes by means of the supply of fluidization gas, characterized in that the gas velocities of the first gas or gas mixture as well as the fluidization gas for the annular fluidized bed (35) are adjusted so that the Froude numbers of the particles in the gas supply tube (3) are between 1 and 100, in the annular fluidized bed (35) between 0.02 and 2 and the mixing chamber (7) between 0.3 and 30.