C - Chemistry – Metallurgy – 21 – C
Patent
C - Chemistry, Metallurgy
21
C
C21C 5/52 (2006.01) C21C 5/54 (2006.01) C21C 7/00 (2006.01)
Patent
CA 2519728
The invention relates to a method for producing foamed slag on high-chromium steel melts in an electric furnace, whereby a mixture consisting of a metal oxide and carbon is introduced into the furnace, the metal oxide in the slag is reduced by the carbon, and the gases created in the slag form bubbles which thus foam up the slag. In order to be able to control the gas formation and thus the foaming process, the mixture consisting of a metal oxide and carbon and optionally an iron carrier is introduced as preforms, such as pellets, which are compressed and/or provided with a binding agent. The gas formation can be controlled in terms of location, type and time, by adjusting the characteristics of the pellets, especially the density and/or compression characteristics thereof.
L'invention concerne un procédé de production d'un laitier expansé sur des fontes d'acier à forte teneur en chrome, dans un four électrique, consistant à introduire un mélange d'oxyde de métal et de carbone dans le four, à réduire l'oxyde de métal au moyen du carbone dans le laitier, les gaz produits formant des bulles dans le laitier et provoquant ainsi une expansion du laitier. L'invention vise à commander la production de gaz et donc le processus d'expansion. A cet effet, le mélange d'oxyde de métal et de carbone, et éventuellement d'un porteur de fer, est introduit sous forme de corps formés comprimés et/ou pourvus d'un liant, tels que des pastilles. Le choix des propriétés, notamment de la densité et/ou des propriétés de compression des pastilles, permet de commander la production de gaz en ce qui concerne la zone, le type et la durée.
Reichel Johann
Rose Lutz
Riches Mckenzie & Herbert Llp
Sms Demag Aktiengesellschaft
Sms Siemag Aktiengesellschaft
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