公开(公告)号：US20250163525A1

公开(公告)日：2025-05-22

申请号：US18836352

申请日：2022-12-01

Applicant: JFE STEEL CORPORATION

Inventor： Yoshiko NAKAHARA ,  Koki TERUI ,  Sumito OZAWA

IPC: C21B13/00

Abstract: In a process of reducing iron ore powder by fluidized bed reduction furnaces and a smelting reduction furnace, CO2 emissions are significantly reduced and stable operation is possible regardless of fluctuations in various conditions. A method of reducing iron ore powder, the method including: a fluidized bed reduction process of fluidizing and reducing iron ore powder in a fluidized bed reduction furnace using a first reducing gas to produce partially reduced iron; and a smelting reduction process of reducing the partially reduced iron in a smelting reduction furnace using a second reducing gas. Fluidized bed reduction furnace top gas discharged from the top of the fluidized bed reduction furnace is used for synthesis of methane and reforming of methane-containing gas.

公开(公告)号：US20240175101A1

公开(公告)日：2024-05-30

申请号：US18551597

申请日：2021-12-03

Applicant: JFE STEEL CORPORATION

Inventor： Koki TERUI ,  Takahide HIGUCHI ,  Tetsuya YAMAMOTO

IPC: C21B13/02 ,  C21B13/00 ,  C22B1/16

CPC classification number: C21B13/02 ,  C21B13/0073 ,  C22B1/16

Abstract: Provided is a reduced iron production method that can efficiently produce reduced iron without preheating raw materials. The reduced iron production method includes charging an agglomerate, which is a raw material of reduced iron, into a reducing furnace while introducing a reducing gas, which contains hydrogen as a main component, into the reducing furnace, and reducing iron oxide contained in the agglomerate by the reducing gas to obtain reduced iron, where the agglomerate to be charged into the reducing furnace is an agglomerate that retains heat obtained during its production, and the heat is used in a reduction reaction of the iron oxide.

公开(公告)号：US20240279758A1

公开(公告)日：2024-08-22

申请号：US18564756

申请日：2022-04-08

Applicant: JFE STEEL CORPORATION

Inventor： Kota MORIYA ,  Koki TERUI ,  Sumito OZAWA

IPC: C21B13/00 ,  C22B1/16

CPC classification number: C21B13/0046 ,  C22B1/16

Abstract: To provide a method for producing agglomerated ore, with which reduced iron can be efficiently produced by hydrogen reduction, without the need for preheating raw material and raising the temperature of reducing gas. A method for producing agglomerated ore, the method including sintering a sintering raw material containing an iron-containing raw material and a condensation material in a sintering machine to form a sinter cake, and obtaining agglomerated ore by crushing the sinter cake, in which iron oxide contained in the sinter cake is reduced by distributing a reducing gas through the sinter cake on the sintering machine, to make a degree of reduction of iron oxide contained in the agglomerated ore after crushing 50% or more.

公开(公告)号：US20240167110A1

公开(公告)日：2024-05-23

申请号：US18551401

申请日：2021-12-03

Applicant: JFE STEEL CORPORATION

Inventor： Takahide HIGUCHI ,  Tetsuya YAMAMOTO ,  Koki TERUI

IPC: C21B5/00

CPC classification number: C21B5/008 ,  C21B5/001

Abstract: Provided is a raw material particle for production of agglomerate that can be used to produce an agglomerate with better reducing performance than conventional agglomerates. The raw material particle 1(2) of the present disclosure is a raw material particle for producing an agglomerate as a raw material for producing reduced iron, including a central part 11(21), and a peripheral part 12(22) that covers the periphery of the central part 11(21). The central part 11 has a metal iron-containing substance, the central part 12 has a volatile substance, and the peripheral part 12(22) has iron oxide.