METHOD FOR MANUFACTURING DIRECT REDUCED IRON WITH MULTI-STAGE FLUID BED REDUCTION USING REFORMED COKE OVEN GAS

• Main Authors: KIM HANG GOO, KIM YONG HA
• Format: Patent
• Language: English; Korean
• Published: 02.11.2020
• Subjects: CHEMISTRY; MANUFACTURE OF IRON OR STEEL; METALLURGY; METALLURGY OF IRON

The present invention is to provide a method for producing direct reduced iron with a metallization rate of 90% or more by reducing iron ore in a multistage fluidized bed method using a coke oven gas (COG) and a reformed coke oven gas (H2-rich COG). The present invention relates to a method for producing reduced iron, which comprises the steps of: (1) performing primary reduction of iron ore fines at a first reduction temperature in a first fluidized reduction furnace using coke oven gas; and (2) performing secondary reduction of the product of step (1) at a second reduction temperature higher than the first reduction temperature in a second fluidized reduction furnace using the reformed coke oven gas. 본 발명은 (1) 코크스로 가스를 이용하여 제1 유동 환원로에서 제1 환원 온도에서 분철광석을 1차 환원시키는 단계; 및 (2) 개질된 코크스로 가스를 이용하여 제2 유동 환원로에서 상기 단계 (1)의 생성물을 제1 환원 온도보다 높은 제2 환원 온도에서 2차 환원시키는 단계를 포함하는 환원철 제조 방법에 관한 것이다.