Method and plant for the heat treatment of sulfidic ores...

C - Chemistry – Metallurgy – 22 – B

Patent

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C22B 1/10 (2006.01) B01J 8/18 (2006.01) B01J 8/26 (2006.01) B01J 8/28 (2006.01) C22B 15/00 (2006.01) F27B 15/02 (2006.01)

Patent

CA 2510106

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.

L'invention concerne un procédé et une installation destinés au traitement thermique de minerais sulfurés, dans lesquels des solides sont chauffés à une température comprise environ entre 450 et 1500 ·C dans un réacteur (1) à lit fluidisé. Afin que l'utilisation d'énergie soit améliorée, on propose d'introduire un premier gaz ou mélange de gaz par le bas par un tube (3) d'alimentation de gaz dans une chambre de mélange (7) du réacteur (1), ce tube (3) d'alimentation de gaz étant partiellement entouré par un lit fluidisé (35) annulaire stationnaire qui est fluidisé par apport de gaz de fluidisation. Les vitesses de gaz du premier gaz ou mélange de gaz ainsi que celle du gaz de fluidisation pour le lit fluidisé (35) annulaire sont ajustées de façon que les nombres de Froude de particules soient compris entre 1 et 100 dans le tube (3) d'alimentation de gaz, entre 0,02 et 2 dans le lit fluidisé (35) annulaire, et entre 0,3 et 30 dans la chambre de mélange (7).

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