Mixture, use of this mixture and process for conditioning a slag located on a metal melt in a metallurgical vessel in iron and steel metallurgy

Abstract

The invention relates to a mixture comprising magnesium, carbon and aluminium to be introduced into the slag located on a metal melt in iron and steel metallurgy, to the use of such a mixture and also to a process for conditioning a slag located on a metal melt in a metallurgical vessel, for example, in a converter, in an electric arc furnace or in a ladle, in iron and steel metallurgy.

1 . A mixture for introducing into the slag located on a metal melt in iron and steel metallurgy, said mixture comprising magnesium, carbon and aluminium in the following mass proportions:
 MgO: 45 to 90 mass %;   C: 12 to 40 mass %;   Al 2 O 3 : 1 to 20 mass %.   
     
     
         2 . The mixture according to  claim 1 , with a proportion of MgCO 3  of less than 10 mass %. 
     
     
         3 . The mixture according to  claim 2 , being present in the form of pellets. 
     
     
         4 . The mixture according to  claim 3 , the granularity of which is present in a grain size less than 0.5 mm to an extent of at least 70 mass %. 
     
     
         5 . The mixture according to  claim 1 , comprising calcium oxide and silicon dioxide in the following mass proportions:
 CaO: 0 to 10 mass %;   SiO 2 : 0 to 7 mass %.   
     
     
         6 . The mixture according to  claim 1 , comprising iron oxide in the following mass proportions:
 iron oxide: 0 to 7 mass %.   
     
     
         7 . A method for conditioning a slag located on a metal melt in a metallurgical vessel in iron and steel metallurgy, said method comprising the following steps:
 providing a mixture, said mixture comprising magnesium, carbon and aluminium in the following mass proportions:   MgO: 45 to 90 mass %;   C: 12 to 40 mass %;   Al 2 O 3 : 1 to 20 mass %; and   introducing the mixture into the slag located on the metal melt in the metallurgical vessel.   
     
     
         8 . (canceled)