Method for the continuous or discontinuous extraction of a...

C - Chemistry – Metallurgy – 22 – B

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Details

C22B 15/00 (2006.01) F27B 3/04 (2006.01) F27B 3/08 (2006.01) F27D 99/00 (2010.01)

Patent

CA 2633318

The invention relates to a method for the continuous or discontinuous extraction of a metal, or of multiple metals from a slag containing the metal, or a compound of the metal, wherein the liquefied metal containing slag is heated in a primary or secondary melting unit (1). In order to provide an improved method for the recovery of particularly copper from slag, the invention provides that the metal containing slag is heated in a primary or secondary melting unit (1) configured as an AC electric furnace, and the melt is subsequently transferred in a furnace (2) configured as a DC electric furnace by means of the primary or secondary melting unit (1), in which an electrolytic separation of the metal to be extracted is carried out, wherein a reduction agent in the form of calcium silicide (CaSi), calcium carbide (CaC2), ferro silicon (FeSi), aluminum (AI), and/or reduction gases is added to, and/or injected into the primary or secondary melting unit (1).

L'invention concerne un procédé d'obtention continue ou discontinue d'un métal ou de plusieurs métaux à partir d'un laitier contenant le métal ou un composé du métal, dans lequel le laitier contenant du métal liquéfié est chauffé dans une unité de fonte (1) primaire ou secondaire. Afin de fournir un meilleur procédé de récupération, en particulier de cuivre à partir des laitiers, l'invention prévoit que le laitier contenant du métal est chauffé dans une unité de fonte (1) primaire ou secondaire formée en tant que four électrique à courant alternatif et la fonte est alors passée de l'unité de fonte (1) primaire ou secondaire à un four (2) formé en tant que four électrique à courant continu, dans lequel une séparation électrolytique du métal à obtenir a lieu, un moyen de réduction sous la forme de siliciure de calcium (CaSi), de carbure de calcium (CaC2), de ferrosilicium (FeSi), d'aluminium (Al) et/ou de gaz de réduction étant alimenté et/ou injecté dans l'unité de fonte (1) primaire ou secondaire.

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