Foaming behaviour of slags from stainless steel production in the electricarc furnace

The investigations of foaming behaviour of slags with a high chromium oxide content were conducted in an electric arc furnace as well as in laboratory scale up to 1760 degreesC using a Tammann furnace. The foaming behaviour o f the slags from two stainless steel plants were quantified on the basis of a new measuring method in laboratory scale. The addition of different addi tives liquefies the slags and make them foamy. Added were mill scale, black oxidation slag and carbon powder. First positive foaming results in praxis were obtained also. The slag's composition and microstructure are changed due to addition of mill scale and carbon powder. Instead of chromite-spinel l, primarily calcium-chromite was determined as primary segregated crystal phase. The amount of carbon powder added to the slag has also influence on its foaming behaviour.