Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1980-05-23
1982-12-07
Andrews, M. J.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
75 74, C22B 1500
Patent
active
043625614
ABSTRACT:
Method and apparatus for smelting an ore concentrate or the like in which the concentrate is first melted in an oxidizing atmosphere and the smelt is thereafter treated with reducing gases to recover the metal values. One of the features of the present invention resides in conducting the after-treatment by means of blowing reducing gases into the smelt with a plurality of separate lances to provide a lighter slag phase and a heavier metal-containing phase, and separately withdrawing the slag phase and the metal containing phase from the furnace. In a particularly preferred embodiment of the invention, the smelt is aftertreated in the sequence involving first blowing an oxidizing gas thereon, then blowing a neutral gas thereon, and finally blowing a reducing gas thereon prior to separating the slag phase from the metal phase.
REFERENCES:
patent: 2784076 (1957-03-01), Greenawalt
patent: 3222162 (1965-12-01), Beals et al.
patent: 3563726 (1971-02-01), Elvander
patent: 4017307 (1977-04-01), Winterhager et al.
patent: 4127408 (1978-11-01), Weigel et al.
patent: 4247087 (1981-01-01), Suprunor
Melcher Gerhard
Weigel Horst
Andrews M. J.
Klockner-Humboldt-Deutz AG
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