Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1975-03-11
1976-11-02
Andrews, M. J.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
75101R, 423119, C21B 504
Patent
active
039895130
ABSTRACT:
Disclosed is a method for the treatment of the red mud byproduct of the Bayer aluminum process, wherein limestone, hydrated lime or other CaO-containing material is added to the red mud in certain molar proportions to the ingredients of the red mud, then the mixture is further mixed with a reducing agent, and the entire mixture is subjected to a reducing heat treatment during the course of which the mix becomes softened or molten. The iron and the slag are separated from each other while the mix is still molten, or after it has been cooled, and then the Na and Al-content of the slag is extracted with a sodium carbonate solution containing a caustic, or with a sodium carbonate solution and a solution of a caustic in two steps.
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patent: 2964383 (1960-12-01), Kamlet
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patent: 3776717 (1973-12-01), Kapolyi et al.
patent: 3876749 (1975-04-01), Horvath et al.
Dobos Gyorgy
Felfoldi Zoltan
Horvath Gyula
Kaptay Gyorgy
Osvald Zoltan
Andrews M. J.
Magyar Aluminiumipari Troszt
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