Fluidized bed reduction of laterite fines with reducing...

C - Chemistry – Metallurgy – 22 – B

Patent

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Details

C22B 23/02 (2006.01) C21B 13/00 (2006.01) C22B 1/10 (2006.01) C22B 5/10 (2006.01) C22B 5/14 (2006.01)

Patent

CA 2371159

The present invention is concerned with a method for the pre-reduction of laterite fines in a reactor, preferably a fluidized bed, with reducing gases generated in situ by adding a reducing agent such as a carbonaceous material in the fluidized bed chamber, fluidizing the bed with an oxidizing gas and maintaining the reactor at a temperature sufficiently high to partially combust the coal and generate a reducing atmosphere. The reactor bed discharge calcine product has a carbon content of about 0.1 %, and the composite reactor product has a carbon content lower than 2.0%.

L'invention concerne un procédé de pré-réduction des fines en latérite dans un réacteur, de préférence un lit fluidisé, au moyen de gaz réducteurs générés in situ par adjonction d'un agent réducteur, tel qu'une matière carbonée, dans la chambre à lit fluidisé, par fluidisation du lit au moyen d'un gaz oxydant et par le maintien du réacteur à une température suffisamment élevée pour obtenir la combustion partielle du charbon et générer une atmosphère réductrice. Le calcinat de décharge du lit du réacteur a une teneur en carbone d'environ 0,1 % et le produit composite du réacteur a une teneur en carbone inférieure à 2,0 %.

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