METHOD OF ALUMINO-THERMAL PRODUCTION OF FERRO-NIOBIUM Russian patent published in 2005 - IPC

FIELD: metallurgy; method of alumino-thermal production of ferro-niobium.

SUBSTANCE: proposed method includes stage-by-stage loading and melting of charge containing niobium concentrate, sodium nitrate, lime, iron ore, aluminum and drainage products of melt; used as niobium concentrate is commercial niobium concentrate. At first stage, charge is loaded at rate of 300-380 kg/m²/min; this charge contains total mass of commercial niobium concentrate and sodium nitrate, 30-70% of iron ore of mass of melt, 20-80% of lime of mass of melt and aluminum in the amount of 0.85-0.99 of amount stoichiometrically required for reduction of elements of ferro-niobium alloy; at second stage, charge is loaded in the amount of 35-55% of mass of niobium pentoxide in commercial niobium concentrate of first stage at rate of 210-270 kg/m²/min, 30-70% of iron ore of mass of melt, 20-80% of lime of mass of melt and aluminum in the amount of 1.6-2.0 of amount stiochiometrically required for reduction of elements of ferro-niobium alloy; before draining, melt is held during period equal to 0.1-0.6 of charge melting time.

EFFECT: increased extraction; improved quality of ferro-niobium alloy.

3 cl, 1 tbl, 9 ex