CHARGE AND ELECTRIC-FURNACE ALUMINOTHERMIC METHOD FOR PRODUCTION OF FERRONIOBIUM WITH USE THEREOF Russian patent published in 2020 - IPC C22C33/04 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy and can be used for production of ferroniobium by electric furnace aluminum-thermal method in inclined hearth with periclase lining. Charge contains, wt. %: niobium pentoxide 42.6–49.3, iron scales 11.5–15.0, aluminum powder 19.2–20.9, calcined lime 11.2–12.3, steel scrap 3.5–6.0, alumina-containing flux 3.0–6.0. When using the charge of the claimed composition, steel scrap is loaded on the bottom of the inclined hearth, and then the ignition part of the charge, containing iron scale, aluminum powder and lime at their ratio of 1:0.3:0.3:(1–2) and ignite it with ignition mixture, after fusion lining, electric arcs are ignited, and then, as far as melting, niobium-containing charge is loaded, containing the whole weight of niobium pentaoxide and lime calcined in amount of 91.6–92.6 wt. % of total lime batch for melting, after its melting, electric furnace is disconnected, charge part is loaded and melted, which contains remaining weighed portion of iron scale, aluminum powder and ground alumina flux at ratio of 1:(1.6–2.3):(0.25–0.72), and at completion of melting metal and slag melt is held in furnace for 5–10 minutes for complete deposition of alloy drops, and then melt is poured into slag.

EFFECT: invention allows to increase extraction of niobium into alloy, partially replace heat input from exothermal reactions to heat from electric arcs, reduce specific consumption of aluminum powder for melting, reduce total weight of charge and slag melt, as well as production cost of products and reduce environmental hazard from man-made formations and costs for slag utilization.

2 cl, 1 tbl