METHOD OF PROCESSING FERROMANGANESIAN RAW MATERIALS Russian patent published in 2002 - IPC

FIELD: metallurgy of ferrous metals; applicable in production of ferromanganese and metal manganese. SUBSTANCE: any ferromanganesian raw material, such as substandard ferriferrous manganese ore of any mineralogical composition and also dump slags containing up to 20% of manganese are continuously charged together with required amount of noncoking coal, lime and/or limestone into ROMELT furnace of liquid-phase reduction operating with oxygen-enriched air blast into bubbled layer of liquid slag through lance lower row with use of industrial oxygen through the second row of lances above slag layer. Due to heat liberated in combustion of C of charged coal in layer of bubbled slag and also liberated CO and H₂ above slag layer, manganese-containing raw material is melted and iron oxides and a number of other metals are reduced by coal carbon with formation of pig iron. Formed pig iron is tapped from furnace through iron taphole. Charge slag, oxide manganese-containing melt, is blown with oxygen-containing gas with simultaneous addition of lime and/or limestone, and metal reducer is introduced. Manganese reducer is used in the form of alloys including silicon, calcium and aluminum to reduce specific consumption of material and power consumption in production, and to extend assortment and raw material base with use of substandard raw materials and production wastes for production of manganese ferroalloys. EFFECT: higher efficiency. 5 cl