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OwnerMichael Stroder, Nikoka Anastasijevic +1inventors
InventorsMichael Stroder, Nikoka Anastasijevic, Marcus Runkel
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The invention relates to a method and a plant for the heat treatment of sulfidic ores, in which solids are heated to a temperature of approximately 450 to 1500° C. in a fluidized bed reactor (1). In order 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 least partly surrounded by a stationary annular fluidized bed (35) which is fluidized by supplying fluidizing gas. The gas velocities of the first gas or gas mixture as well as of the fluidizing gas for the annular fluidized bed (35) are adjusted such that the particle Froude numbers in the gas supply tube (3) are between 1 and 100, in the annular fluidized bed (35) between 0.02 and 2 and in the mixing chamber (7) between 0.3 and 30.
A method for heat treating sulfidic ores, comprising treating solids at a temperature of 450 to approximately 1500° C. in a fluidized bed reactor, introducing from below a first gas or gas mixture through a gas supply tube into a mixing chamber of the reactor, the gas supply tube being at least partly surrounded by a stationary annular fluidized bed which is fluidized by supplying fluidizing gas, and adjusting gas velocities of the first gas or gas mixture and the fluidizing gas for the annular fluidized bed wherein the gas velocities have a particle Froude number in the gas supply tube between 1 and 100, in the annular fluidized bed between 0.02 and 2, and in the mixing chamber between 0.3 and 30.
Dependencies are inferred from the claim text.