Method of smelting copper

Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes

Reexamination Certificate

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C075S640000

Reexamination Certificate

active

07955409

ABSTRACT:
A method of smelting copper includes: a generating step of generating blister and slag from copper matte by charging the copper matte into a smelting furnace and oxidizing the copper matte; a first refining step of refining another blister from the slag by reduction in an electrical furnace; and a charging step of charging the slag into one of the smelting furnace or another smelting furnace for treating copper concentrate and generating matte as repeating flux if copper grade of slag generated in the first refining step is higher than 0.8 weight %.

REFERENCES:
patent: 4144055 (1979-03-01), Petersson et al.
patent: 6761749 (2004-07-01), Poijarvi et al.
patent: 53-22115 (1978-03-01), None
patent: 57-192232 (1982-11-01), None
patent: 61-531 (1986-01-01), None
patent: 11-21636 (1999-01-01), None
patent: 2003-213347 (2003-07-01), None
patent: 2003-819288 (2003-08-01), None
patent: 2006-188738 (2006-07-01), None
Kojo et al., “Outokumpu Blister Smelting Processes, Clean Technology Standards”, Cu2007, The proceedings of the Carlos Diaz Symposium on Pyrometallurgy, vol. 3, Book 2, (Toronto, Canada, 2007), pp. 183-190.
Tuominen et al., “Slag Cleaning of Outokumpu Direct-to-Blister Flash Smelting Slags”, Cu2007, The proceedings of the Carlos Diaz Symposium on Pyrometallurgy, vol. 3, Book 2, (Toronto, Canada, 2007), pp. 339-350.
Japanese Office Action dated Aug. 3, 2010 issued in corresponding Japanese patent application No. 2008-227158 (with English translation).

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