REFINING FLUX FOR OUT OF FURNACE FINISHING OF STEEL Russian patent published in 2020 - IPC C21C7/76 C22B1/242 

FIELD: metallurgy.

SUBSTANCE: invention relates to ferrous metallurgy and can be used in out-of-furnace steel finishing on aggregates of complex steel processing (ACSP), ladle-furnace and vacuum devices. Refining flux for out-of-furnace steel finishing consists of briquettes from slag-forming mix containing binder 1–4 wt. % and pressed components containing Al₂O₃, 30÷99 wt. %. Flux contains wastes of secondary aluminium containing CaO, Al₂O₃, MgO, SiO₂ and consists of, wt. %: alumina slag or aluminothermic slag with Al₂O₃ content of 70–80 % 35–45; screenings of line alumoslates with Al₂O₃ content of 40–50 % 40–50; screenings of high-basic steel-smelting slags 15–20, at that content of SiO₂ in form of refractory mineral components with melting point higher than 1690 °C in free form is limited to 14 %, content of low-melting compounds of alkali metals in form of NaCO₃, KCO₃, NaCl, KCl, NaF in terms of oxides (Na₂O + K₂O) is limited to 10 wt. %, components with Al₂O₃ content in excess of 70 % in form of 0–1 mm fraction in total amount up to 40 %.

EFFECT: invention makes it possible to exclude formation of refractory transition compounds in the initial stage of slag formation process, to reduce duration of melting under the arc at the ladle furnace and specific consumption of aluminium.

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