FIELD: equipment for metallurgy, chemistry, heat-power engineering and public utilities. SUBSTANCE: construction of furnace makes it possible to work under pressure due to availability of hermetic casing around furnace shaft and siphon provided with vertical row of blast-holes. Casing embraces shaft above level of tuyeres; casing is provided with nitrogen inlet and outlet branch pipes. Slag discharge siphon is heated. EFFECT: enhanced reliability. 1 dwg
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