Process and additives for the ladle refining of steel

Details Process and additives for the ladle refining of steel Process and additives for the ladle refining of steel

C - Chemistry, Metallurgy

21

C

C21C 7/064 (2006.01) C21C 7/00 (2006.01) C21C 7/076 (2006.01)

Patent

CA 2118646

A process of refining steel in a Ladle Metallurgy Furnace (LMF) using solid granules or briquettes made from recycled LMF slag and raw materials to make a desulfurizing addition, a slag conditioner or synthetic refining slag is described. The preferred recycled LMF slag material generally comprises of 35% to about 65% CaO; 10% to about 35% Al2O3; 1% to about 10% SiO2; 3% to about 15% MgO; 0.3% to about 10% FeO; 0.1% to about 5% MnO; 0% to about 0.5% P2O5; and 0.1% to about 0.5% s. The ladle metallurgy furnace additive comprises from about 10% to about 90% of a recycled ladle metallurgy furnace slag and the balance of raw materials selected from the group consisting of: a calcium oxide source; soda ash; fluorspar; borax; calcium carbonate; aluminum source; calcium aluminate; alumina source; metallic calcium, magnesium, sodium and their oxides, fluorides and carbides; and mixtures of all of the foregoing.

La présente invention concerne un procédé d'affinage d'acier en four métallurgique à poche de coulée (LMF) à l'aide de granules ou briquettes de laitier recyclé de four métallurgique à poche de coulée (LMF) entrant dans la fabrication, avec des matières brutes, d'ingrédients de fluidisation, de désulfuration et de raffinage synthétiques. Le laitier LMF recyclé préféré comprend de 35 % environ à 65 % environ de CaO, de 10 % environ à 35 % environ de Al2O3, de 1 % environ à 10 % environ de SiO2, de 3 % environ à 15 % environ de MgO, de 0,3 % environ à 10 % environ de FeO, de 0,1 % environ à 5 % environ de MnO, de 0 % environ à 0,5 % environ de P2O5, et de 0,1 % environ à 0,5 % environ de S. La composition de fondant pour bassin de coulée comprend de 10 % environ à 80 % environ de laitier LMF recyclé, le reste étant composé de matières brutes choisies parmi les suivants : oxyde de calcium, carbonate de sodium, fluorine, borax, carbonate de calcium, aluminium, aluminate de calcium, alumine, calcium, magnésium et sodium métalliques et leurs oxydes, fluorures et carbures, et des mélanges de ces matières brutes.

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