Method for recovering metallic elements, especially metallic...

C - Chemistry – Metallurgy – 21 – C

Patent

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Details

C21C 5/52 (2006.01) C21C 5/56 (2006.01) C21C 7/00 (2006.01) C22B 34/32 (2006.01)

Patent

CA 2525559

The invention relates to a method for recovering metallic elements, especially metallic chromium, from slag containing oxides, especially chromium oxides, in an electric-arc furnace. According to said method, the slag is not reduced in a separate step after melting, but the following steps are carried out: a charge is introduced into the electric-arc furnace, and melted, forming a molten metal and slag; said molten metal is tapped off, leaving the unreduced slag in the furnace vessel; a further charge of scrap metal including reducing agents for the slag is added; the slag is reduced during the melting of said charge; and the slag and the molten metal are then tapped off. The inventive method can also be used in ladle metallurgy or converter metallurgy.

L'invention concerne un procédé de récupération d'éléments métalliques, notamment de chrome métallique, à partir de laitiers contenant des oxydes, notamment des oxydes de chrome, dans un four à arc électrique. Selon l'invention, le laitier n'est pas réduit dans une étape séparée après fusion. Le procédé selon l'invention comporte les étapes suivantes : après introduction d'une charge dans le four à arc électrique, la charge est fondue de manière à former une fonte métallique et un laitier ; la fonte est percée et le laitier non réduit reste dans la cuve du four ; une charge ultérieure de grenaille et d'agent de réduction de laitier est introduite ; le laitier est réduit lors du processus de fusion de la charge ; et, le laitier et la fonte sont percés. Le procédé selon l'invention peut également être employé dans la métallurgie à poche ou à convertisseur.

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