Method for refining concentrate containing precious metals

C - Chemistry – Metallurgy – 22 – B

Patent

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Details

C22B 11/02 (2006.01) C22B 23/02 (2006.01)

Patent

CA 2484416

The invention relates to a method for refining precious metal concentrate, and according to said method, at least the precious metal concentrate (9), reaction gas (10), flux (11) and flue dust (12) to be treated are fed together into the reacton shaft (3) of a suspension smelting furnace (1); in the suspension smelting furnace, there are created separate phases, matte (8) and slag (7); and the slag created in the suspension smelting furnace is conducted into an electric furnace (2), so that there is created metallicized matte (14) and waste slag (13). Thereafter the matte (8) from the suspension smelting furnace is conducted to hydrometallurgical treatment (15), and the slag conducted into the electric furnace is treated together with a reducing agent and possibly with a material lowering the melting point or improving fluidity, and the obtained metallicized matte (14) is conducted either to hydrometallurgical treatment (16) or back into the suspension smelting furnace in (1).

L'invention concerne un procédé de raffinage d'un concentré de métaux précieux consistant à alimenter ensemble au moins le concentré de métaux précieux (9), un gaz de réaction (10), un flux (11) et de la poussière de carneau (12) à traiter dans une cuve réactionnelle (3) d'un four de fusion à suspension (1); dans ledit four, des phases distinctes sont créées, une matte (8) et du laitier (7) ; et le laitier créé dans le four de fusion à suspension est amené dans un four électrique (2), de manière à créer une matte métallisée (14) et du laitier de rejet (13). Puis, la matte (8) provenant du four de fusion à suspension est soumise à un traitement hydrométallurgique (15) et le laitier amené dans le four électrique est traité conjointement avec un agent de réduction et éventuellement avec un matériau faisant baisser le point de fusion ou améliorant la fluidité et la matte métallisée obtenue est soit soumise à un traitement hydrométallurgique (16), soit ramenée dans le four de fusion à suspension (1).

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