Method of treating the slag from a copper converter

Details Method of treating the slag from a copper converter Method of treating the slag from a copper converter

C - Chemistry, Metallurgy

22

B

53/282

C22B 7/04 (2006.01) C22B 15/00 (2006.01) C22B 15/04 (2006.01) C22B 15/06 (2006.01)

Patent

CA 1247865

ABSTRACT OF THE DISCLOSURE A method of treating the slag from a copper converter comprises introducing the molten slag from a copper converter into a furnace having tuyeres through which air can be blown into the molten slag, blowing into the slag through the tuyeres at least 6% by weight of pulverized coal with air or oxygen-enriched air having an oxygen content of 21 to 40% by volume to separate molten metallic copper from the slag, the amount of the air having a ratio of 0.3 to 0.7 to theoretical combustion of the coal, adding a source of sulfur to the separated copper to form a molten matte, maintaining the matte at a reduced pressure not exceeding 0.6 mm Hg for at least five minites in a vacuum refining apparatus to remove impurities from the matte by volatilization, and treating the refined matte in a copper converter used for the treatment of a matte produced by a smelting furnace. - 18 -

500709

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