Reduced iron production method and reduced iron production device

Patent metadata

Field	Value
Publication number	US-2024175101-A1
Application number	US-202118551597-A
Country	US
Kind code	A1
Filing date	Dec 3, 2021
Priority date	Mar 31, 2021
Publication date	May 30, 2024
Grant date	—

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.

First claim

1 . A reduced iron production method, comprising 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, wherein
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.

2 . The reduced iron production method according to claim 1 , wherein the agglomerate is charged directly into the reduction furnace after its production.

3 . The reduced iron production method according to claim 1 , wherein the reducing gas is hydrogen gas.

4 . A reduced iron production device that is used in the reduced iron production method according to claim 1 , comprising
an agglomerate production section where the agglomerate is produced by agglomerating a raw material of the agglomerate, and a reduction section having an agglomerate charging inlet for charging the agglomerate produced in the agglomerate production section, a reducing gas inlet for introducing the reducing gas, and an outlet for discharging the reducing gas that is not used in the reduction reaction and water formed in the reduction reaction, where in the reduction section, iron oxide contained in the agglomerate is reduced by the reducing gas to obtain reduced iron.

5 . The reduced iron production device according to claim 4 , wherein the reduction section is directly connected to the agglomerate production section.

6 . The reduced iron production device according to claim 4 , wherein the agglomerate production section and the reduction section are horizontal.

7 . The reduced iron production device according to claim 4 , wherein the reduction section is vertical.

8 . The reduced iron production method according to claim 2 , wherein the reducing gas is hydrogen gas.

9 . A reduced iron production device that is used in the reduced iron production method according to claim 2 , comprising
an agglomerate production section where the agglomerate is produced by agglomerating a raw material of the agglomerate, and a reduction section having an agglomerate charging inlet for charging the agglomerate produced in the agglomerate production section, a reducing gas inlet for introducing the reducing gas, and an outlet for discharging the reducing gas that is not used in the reduction reaction and water formed in the reduction reaction, where in the reduction section, iron oxide contained in the agglomerate is reduced by the reducing gas to obtain reduced iron.

10 . A reduced iron production device that is used in the reduced iron production method according to claim 3 , comprising
an agglomerate production section where the agglomerate is produced by agglomerating a raw material of the agglomerate, and a reduction section having an agglomerate charging inlet for charging the agglomerate produced in the agglomerate production section, a reducing gas inlet for introducing the reducing gas, and an outlet for discharging the reducing gas that is not used in the reduction reaction and water formed in the reduction reaction, where in the reduction section, iron oxide contained in the agglomerate is reduced by the reducing gas to obtain reduced iron.

11 . A reduced iron production device that is used in the reduced iron production method according to claim 8 , comprising
an agglomerate production section where the agglomerate is produced by agglomerating a raw material of the agglomerate, and a reduction section having an agglomerate charging inlet for charging the agglomerate produced in the agglomerate production section, a reducing gas inlet for introducing the reducing gas, and an outlet for discharging the reducing gas that is not used in the reduction reaction and water formed in the reduction reaction, where in the reduction section, iron oxide contained in the agglomerate is reduced by the reducing gas to obtain reduced iron.

12 . The reduced iron production device according to claim 9 , wherein the reduction section is directly connected to the agglomerate production section.

13 . The reduced iron production device according to claim 10 , wherein the reduction section is directly connected to the agglomerate production section.

14 . The reduced iron production device according to claim 11 , wherein the reduction section is directly connected to the agglomerate production section.

15 . The reduced iron production device according to claim 9 , wherein the agglomerate production section and the reduction section are horizontal.

16 . The reduced iron production device according to claim 10 , wherein the agglomerate production section and the reduction section are horizontal.

17 . The reduced iron production device according to claim 11 , wherein the agglomerate production section and the reduction section are horizontal.

18 . The reduced iron production device according to claim 9 , wherein the reduction section is vertical.

19 . The reduced iron production device according to claim 10 , wherein the reduction section is vertical.

20 . The reduced iron production device according to claim 11 , wherein the reduction section is vertical.

Assignees

• Jfe Steel Corp

Inventors

• Terui Koki
• Higuchi Takahide
• Yamamoto Tetsuya

Classifications

• C21B13/02 Primary

  in shaft furnaces · CPC title

• C21B13/0073 Primary

  Selection or treatment of the reducing gases · CPC title

• C22B1/16

  Sintering; Agglomerating · CPC title

• C21B13/14

  Multi-stage processes {processes carried out in different vessels or furnaces} · CPC title

• C21B13/105

  Rotary hearth-type furnaces · CPC title