Peculiarities of silicomanganese smelting technology and its efficiency increase by semi-coke application

. Peculiarities of silicomanganese smelting technology in a shaft ore-reduction furnace considered, a diagram of its bath structure presented, as well as currents distribution, temperature and slag regimes. Manganese and silicon reduction mechanism presented, in which complexes formed in the coke layer are playing a leading role, the complexes being consisted of high-carbon Fe– C–Mn melt drops and included inside them carbon reducing agent small particles. It was shown, that those drops-complexes moving through the slag melt layer results in additional reduction of manganese and silicon from the slag. materials” (ZUM) production application analyzed for silicomanganese smelting from manganese ores concentrates, containing 33–37% Mn. Semi-coke quality indices presented, comparing with traditionally used coke nuts. It was determined that UVF semi-coke considerably exceeds the coke nuts by physical and chemical properties (reaction ability, specific electric resistance, ash content). A calculation of material balances of silicomanganese heats with usage of UVF semi-coke and coke nuts done, advantage of semi-coke application shown even at minimal increase of manganese into metal extraction coefficient (~1%). Theoretical calculations and industrial experience confirmed efficiency of UVF semi-coke of OJSC ZUM production application as a carbon reducing agent at manganese alloys smelting. Longtime industrial tests of semi-coke at ferro-silicomanganese smelting at RKO-25 furnaces of Taraz steel-works, Kazakhstan, and GeoFerroMetal plant, Georgia, showed a high technical and economic efficiency of semi-coke application instead of 50% and 100% coke nuts.