AN APPARATUS FOR RECYCKING INCOMPLETELY-REDUCED FINE IRON ORE AND A METHOD FOR RECYCLING AND TREATING AT EMERGENCY THE INCOMPLETELY-REDUCED FINE IRON ORE BY USING THE SAME APPARATUS IN A FLUIDIZED-BED REDUCTION PROCESS

摘要

PURPOSE: An apparatus for recycling incompletely reduced fine iron ore in fluidized-bed reduction process is provided which improves operation efficiency and productivity of ingot iron manufacturing process, and methods for recycling and emergency treating the incompletely reduced fine iron ore by using the apparatus are provided. CONSTITUTION: In an ingot iron manufacturing apparatus comprising fluidized bed reduction furnaces such as preheating furnace, prereduction furnace and final reduction furnace; a melter-gasifier; ore pipes connected to the respective reduction furnaces and melter-gasifier to charge raw materials; and gas pipes connected to the melter-gasifier and reduction furnaces to reduce raw materials, the apparatus for recycling incompletely reduced fine iron ore in fluidized-bed reduction process comprises first discharge line(2) equipped with fifth ore pipe(35a) connected to the middle part of the final reduction furnace(30) to discharge incompletely reduced fine iron ore from the final reduction furnace(30) during the initial stage of operation; second discharge line(3) equipped with sixth ore pipe(35b) connected to the lower part of the final reduction furnace(30) to discharge incompletely reduced fine iron ore from the final reduction furnace(30) during abnormal operation; a storage tank(50) connected to the respective discharge lines to store the incompletely reduced fine iron ore; and a pneumatic carrier tube(53) connected from the storage tank(50) to the final reduction furnace(30) to charge the incompletely reduced fine iron ore into the final reduction furnace(30) by recycling the incompletely reduced fine iron ore.