| 摘要 |
<p>PCT No. PCT/KR97/00275 Sec. 371 Date Aug. 20, 1998 Sec. 102(e) Date Aug. 20, 1998 PCT Filed Dec. 19, 1997 PCT Pub. No. WO98/28449 PCT Pub. Date Jul. 2, 1998A 3-stage fluidized bed type iron ore reducing apparatus having X shaped circulating tubes is disclosed for forming a gas pore fluidizing layer of a fine iron ore, and for drying/pre-heating it to reduce it, so that the gas utilization rate and the reducing rate can be improved, as well as decreasing the gas consumption rate. The present invention relates to a 3-stage fluidized bed type iron ore reducing apparatus having X shaped circulating tubes comprising: a shaft type single type first fluidized bed furnace where a raw fine iron ore is dried and pre-heated in a bubbling fluidization state; a first cyclone for collecting fine iron ore particles from a exhaust gas of said first fluidized bed type furnace; a shaft type single type second fluidizing bed furnace where the dried and pre-heated fine iron ore is pre-reduced in a bubbling fluidization state; a second cyclone for separating the fine iron ore particles from a exhaust gas from said second fluidizing bed type furnace so as to re-circulate them; a twin type third fluidized bed furnace consisting of a first reaction furnace and a second reaction furnace, for separating the pre-reduced iron ore from said second fluidized bed type furnace into coarse particles and medium/fine particles so that the coarse particles and medium/fine particles ore finally reduced in separate reactors in bubbling fluidization states; and a third cyclone for separating fine iron ore particles from the exhaust gas of said second reaction furnace of said third fluidized bed type furnace so as to re-circulate them to said first reaction furnace.</p> |
