Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1975-08-13
1977-06-28
Satterfield, Walter R.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
75 24, 75 76, C22B 1500, C21B 304
Patent
active
040323277
ABSTRACT:
A cyclic, two-stage process is disclosed for pyrometallurgical recovery of copper as a high-grade matte from molten slag material containing both dissolved and/or entrained copper values. A charge of the copper-bearing slag material is treated in the first stage of the process with a hydrocarbonaceous or hydrogenous reductant in a rotary furnace, such as a top-blown rotary reactor, rotating at at least about 10 rpm, to form a high-grade copper matte phase and a slag phase of reduced copper content. The rotation of the reactor is discontinued and the high-grade copper matte phase separates from the slag phase and is recovered from the reactor. The reactor containing the remaining slag of reduced copper content is again rotated at about 10 rpm, and iron sulfide, e.g. pyrite, is added in the second stage of the process to the slag in the rotating reactor to provide a low-grade matte phase which literally "washes out" most of the remaining copper contained in the slag. The rotation of the reactor is again discontinued and the low-grade matte phase separates from the remaining slag phase. The remaining slag phase is removed from the reactor, and the low-grade matte produced in the second stage is left in the reactor to mix with an additional charge of slag material in a subsequent cycle of the process.
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patent: 3666440 (1972-05-01), Kono et al.
patent: 3682623 (1972-08-01), Dierckx et al.
Donaldson John W.
Sharma Sheree N.
Themelis Nicholas John
Kennecott Copper Corporation
Satterfield Walter R.
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