Pyrometallurgical method for recovering volatile metals from...

C - Chemistry – Metallurgy – 22 – B

Patent

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C22B 19/04 (2006.01) C22B 4/04 (2006.01) C22B 11/02 (2006.01) C22B 13/02 (2006.01) C22B 17/02 (2006.01)

Patent

CA 2096665

The invention relates to a method for recovering zinc, cadmium, lead and other volatile metals from sulfidic raw materials in a pyrometallurgical process. In the method, zinc sulfide raw material is fed into molten copper in a reduction furnace under atmospheric conditions and at a temperature in the range of 1,450 to 1,800°C, so that the zinc, lead and cadmium are volatilized while the iron, copper and precious metals remain in the molten metal or in a metal sulfide matte created in the furnace.

L'invention a trait à une méthode de récupération du zinc, du cadmium, du plomb ou d'autres métaux volatils dans des matières premières renfermant des sulfures dans un procédé pyrométallurgique. Dans cette méthode, la matière première renfermant du sulfure de zinc est introduite dans du cuivre en fusion dans un four de réduction dans des conditions atmosphériques et, à une température, de l'ordre de 1 450 à 1 800 degrés Celsius, pour que le zinc, le plomb et le cadmium se volatisent pendant que le fer, le cuivre et les métaux précieux demeurent dans le métal en fusion ou dans une matte métallique sulfureuse créée dans le four.

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