ALUMINA MIXTURE FOR LIQUEFACTION OF METALLURGICAL SLAG Russian patent published in 2021 - IPC C22B9/10 C21C5/00 C21C7/06 C22B7/04 

FIELD: chemistry.

SUBSTANCE: invention relates to a mixture of aluminium oxide for liquefaction of metallurgical slag during production of steel and alloys. Mixture consists of metal cranberry component and slag component, at that, metal crust component contains not less than 20.0 wt. % of aluminium crustal fraction +10 mm, not more than 4.0 wt. % of magnesium, not more than 3.0 wt. % of iron, not more than 3.0 wt. % of silicon, not more than 1.0 wt. % of copper and not more than 1.5 wt. % of zinc, and slag component contains not more than 18.0 wt. % of chlorine ions, not more than 25.0 wt. % of sodium and potassium salts in ratio 1:1, not more than 6.0 wt. % of calcium oxide, not more than 3.5 wt. % of magnesium oxide, not more than 9.0 wt. % of silicon oxide, not more than 3.0 wt. % of iron oxide Fe₂O₃, aluminium oxide is the rest. Mixture has hygroscopic moisture content of not more than 2 wt. % and content of magnetic fraction of not more than 4.0 wt. %.

EFFECT: use of the disclosed alumina mixture as an improved alumina-containing thinner of metallurgical slag in the production of steel and alloys, increases efficiency of the liquefaction process by reducing consumption of graphitized electrodes of complex steel processing facility, reduced consumption of electric energy, increased stability of lining of ladle and reduced specific consumption of refractories of slag belt, and also reduced consumption of lime used for slag liquefaction.

3 cl