Method and apparatus for smelting and reducing iron ores.

摘要

A method for smelting and reducing iron ores comprises the steps of: the step of preheating and prereducing iron ores; the step of charging the preheated and prereduced iron ores into a smelting reduction furnace (10); the step of charging carbonaceous material and fluxing material into the smelting reduction furnace (10); the step of blowing in oxygen gas into the smelting reduction furnace (10) through a top-blow oxygen lance (21) having decarbonizing nozzles (22) and post combustion nozzles (23); and the step of blowing in stirring gas through side and bottom tuyeres (25;26) set respectively in a side wall and a bottom of the smelting reduction furnace (10). Furthermore, an apparatus for smelting reduction fitted for the method comprising: a preheat and prereduction furnace (30) preheating and prereducing iron ores; a smelting reduction furnace (10) into which iron ores, carbonaceous material and fluxing material are charged and in which the iron ores are smelted and reduced; a top-blow oxygen lance (21) through which oxygen gas is blown in into the smelting reduction furnace (10), having decarbonizing nozzles (22) and post combustion nozzles (23); and the smelting reduction furnace (10) having bottom and side tuyeres (25,26) built respectively in a side wall and a bottom thereof.