STEEL-MELTING "ECOSLAG" FLUX AND METHOD OF ITS PRODUCTION AND APPLICATION Russian patent published in 2017 - IPC C21C5/06 C21C7/76 C22B9/10 

FIELD: metallurgy.

SUBSTANCE: steel-melting flux contains, wt %: calcium oxide base; aluminium oxide 5-25; silicon dioxide, 5-20; magnesium oxide, 4-15; iron oxides0.1-2 which is fed to slag crystallisation unit for thermal stabilisation by accelerated cooling in the temperature range 1600→600°C at a rate of 30-100°C/s providing crystallisation of dicalcium silicate (C₂S) in metastable phase β_L and producing conditioned product of lump shape with 5-70 mm fraction and cut-off fraction less than 5 mm.

EFFECT: invention makes it possible to produce flux with low melting temperature and high reactivity, provides formation of primary slag saturated with oxides of calcium and iron, reduction of negative effect on the environment due to elimination of waste formation and emissions of fluorine-containing substances, accumulation and storage of slag in dumps.

4 cl, 3 ex, 4 tbl