Method for the reduction of a slag having a high degree of...

C - Chemistry – Metallurgy – 21 – C

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

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

Patent

CA 2677674

During the production of stainless steel, a slag is formed during the melting of the solid material in the electric arc furnace, the slag having a high degree of metal oxides, particularly chromium oxide. The chromium concentration often reaches values of more than 30%. Currently, such slags cannot be reduced to a desired degree due to their composition. In order to minimize the resulting high loss of recyclable material, the invention provides to charge the electric arc furnace with pellets, or briquettes (8), which are made of a defined mixture of an iron carrier as the ballast material, carbon, or carbon and silicon, as the reducing agent, and a binder, wherein they react beneath the slag layer (7) in the steel melt (6) with the metal oxides of the slag (7), particularly with the chromium oxide present, in a floating, chemical, and reducing manner. The reaction gases (12) produced in the process, which are mainly made of carbon monoxide, advantageously support a foaming of the slag (7).

Lors de la fabrication d'acier inoxydable, il se forme un laitier au cours de l'entrée en fusion du matériau solide dans le four à arc électrique, ledit laitier contenant une proportion élevée d'oxydes métalliques, avant tout de l'oxyde de chrome. La concentration en oxyde de chrome atteint fréquemment des valeurs supérieures à 30%. Jusqu'à présent, les laitiers de ce type ne pouvaient pas être réduits dans les proportions voulues, de par leur composition. Afin de minimiser les pertes importantes en matériau qui résultent de cet état de fait, il est prévu selon l'invention de charger le four à arc électrique en pellets et en briquettes (8), composés d'un mélange défini comprenant un support ferreux comme matériau ballast, du carbone ou du carbone et du silicium comme agent de réduction, ainsi qu'un matériau liant, four dans lequel ledit mélange réagit chimiquement, sous la couche de laitier (7), dans l'acier en fusion (6), avec les oxydes métalliques du laitier (7), notamment avec l'oxyde de chrome contenu, de manière flottante et de sorte à induire une réduction. Les gaz de réaction (12) alors produits, qui se composent essentiellement de monoxyde de carbone, participent avantageusement à un moussage du laitier.

LandOfFree

Say what you really think

Search LandOfFree.com for Canadian inventors and patents. Rate them and share your experience with other people.

Rating

Method for the reduction of a slag having a high degree of... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method for the reduction of a slag having a high degree of..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for the reduction of a slag having a high degree of... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFCA-PAI-O-1866324

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.