Process for producing foamed slag

Details Process for producing foamed slag Process for producing foamed slag

C - Chemistry, Metallurgy

21

C

C21C 7/00 (2006.01) C21C 5/52 (2006.01) C21C 5/54 (2006.01)

Patent

CA 2729876

The invention is directed to a process for producing foamed slag. The object of the invention is to provide a process and material by which the foaming of a slag with a high chromium oxide content can be achieved. This object is met in that an electric arc furnace is charged with a mixture of metal oxides and carbon and, below the slag at the metal-slag interface, the metal oxide is reduced by carbon and limestone becomes thermally discordant, and the occurring gases cause the slag to foam due to the formation of bubbles.

Linvention concerne un procédé de fabrication dun laitier expansé. L'invention vise à créer un procédé et un matériau permettant dobtenir le moussage d'un laitier à teneur élevée en oxyde de chrome. Pour ce faire, un mélange doxydes métalliques et de carbone est introduit dans un four à arc électrique; les oxydes métalliques sont réduits par le carbone et le calcaire est décomposé thermiquement au-dessous du laitier, sur linterface métal-laitier; et les gaz obtenus provoquent le moussage du laitier par formation de bulles.

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