Method for recovering molybdenium, nickel, cobalt or their...

C - Chemistry – Metallurgy – 22 – B

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C22B 7/00 (2006.01) C22B 23/02 (2006.01) C22B 34/34 (2006.01)

Patent

CA 2682532

The invention describes a method for recovering molybdenum, nickel, cobalt or their mixtures from used or regenerated catalysts in an electric arc furnace containing a heel of liquid cast iron, surmounted with a fluid slag, comprising the following steps: a) adding used or regenerated catalysts into the heel contained in the electric arc furnace, b) adding dosed lime in order to obtain a slag with a CaO to Al2O3ratio comprised between 0.7 and 1.3, c) mixing the heel by injecting gas so as to avoid formation ofcrusts, d) melting the used or regenerated catalysts in the electric arc furnace in order to obtain a liquid ferro-alloy.

L'invention concerne un procédé pour la récupération de molybdène, nickel, cobalt ou leurs mélanges à partir de catalyseurs régénérés ou utilisés dans un four à arc électrique contenant un miroir de fonte liquide, surmonté par un laitier fluide, comprenant les étapes suivantes : a) ajouter des catalyseurs régénérés ou utilisés dans le miroir contenu dans le four à arc électrique , b) ajouter de la chaux dosée afin d'obtenir un laitier avec un rapport de CaO à Al2O3 compris entre 0.7 et 1.3, c) mélanger le miroir en injectant du gaz de sorte à éviter la formation de croûtes, d) procéder à la fusion des catalyseurs régénérés ou utilisés dans le four à arc électrique afin d'obtenir un ferroalliage liquide.

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