Method for the production of blister copper

C - Chemistry – Metallurgy – 22 – B

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C22B 15/00 (2006.01)

Patent

CA 2459962

The invention relates to a method to produce blister copper or high grade matte in a smelting reactor directly from a sulfidic copper concentrate containing material and/or finely ground copper matte, whereby oxygen-containing gas, copper concentrate and/or finely ground copper matte are fed into the reactor. According to the invention CaO and SiO2 containing flux is fed into the smelting reactor along with oxygen-containing gas, copper concentrate and/or copper matte, and part of the copper in the concentrate and/or in the matte is oxidized in order to form a slag in which the CaO/SiO2 ratio is higher than 1.5, and in which the copper content is in oxidized form, and in which the lime content calculated in a CaO+SiO2+FeO x=100 system is higher than 20 %.

L'invention concerne un procédé de fabrication de cuivre brut ou de matte de qualité élevée dans un réacteur de fusion directement à partir d'un concentré de cuivre sulfidique renfermant un matériau et/ou une matte de cuivre finement broyée, un gaz renfermant de l'oxygène, un concentré de cuivre et/ou une matte de cuivre finement broyée étant alimentés dans le réacteur. Selon l'invention, un flux renfermant du CaO et SiO¿2? est alimenté dans le réacteur de fusion avec le gaz renfermant de l'oxygène, le concentrée de cuivre et/ou la matte de cuivre, et une partie du cuivre dans le concentré et/ou dans la matte est oxydée de manière à former un laitier dans lequel le rapport CaO/SiO¿2? est supérieur à 1,5, et dans lequel la teneur en cuivre est sous forme oxydée et dans lequel la teneur en chaux calculée dans un système CaO+SiO¿2?+FeO¿x?=100 est supérieure à 20 %.

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