A method for manufacturing direct reduced iron

Patent metadata

Field	Value
Publication number	US-2024254575-A1
Application number	US-202218290551-A
Country	US
Kind code	A1
Filing date	May 19, 2022
Priority date	May 31, 2021
Publication date	Aug 1, 2024
Grant date	—

Abstract

A method for manufacturing direct reduced iron wherein iron ore is reduced in a direct reduction furnace by a reducing gas, the reducing gas exiting the furnace through the top as a top reduction gas. The top reduction gas is captured and at least partly subjected to a CO2 recovery step during which it is divided into two streams, a CO2-rich stream and a CO2-poor stream. The CO2-rich stream is subjected to an alkanol production step to produce an alkanol product.

First claim

1 - 15 . (canceled)

16 . A method for manufacturing direct reduced iron, the method comprising:
reducing iron ore in a direct reduction furnace by a reducing gas, the reducing gas exiting the furnace through a top as a top reduction gas; capturing the top reduction gas; at least partly subjecting the top reduction gas to a CO2 recovery step, the top reduction gas during the CO2 recovery step being divided into a CO2-rich stream and a CO2-poor stream; and subjecting the CO2-rich stream to an alkanol production step to produce an alkanol product.

17 . The method as recited in claim 16 wherein the alkanol product is then at least partly injected into the direct reduction furnace.

18 . The method as recited in claim 16 wherein the CO2-poor stream is re-injected into the furnace as at least part of the reducing gas.

19 . The method as recited in claim 16 wherein the CO2-rich stream contains between 80 and 100% in volume of carbon dioxide.

20 . The method as recited in claim 16 wherein from 1 to 20% in volume of said top reduction gas is subjected to the alkanol production step.

21 . The method as recited in claim 16 wherein a hydrogen stream is supplied to the alkanol production step to react with the CO2-rich stream.

22 . The method as recited in claim 16 wherein the alkanol product is a gas mixed with the reducing gas before injection into the furnace.

23 . The method as recited in claim 16 wherein the alkanol product is a liquid.

24 . The method as recited in claim 16 wherein the alkanol product is injected separately from the reducing gas, in a transition zone of the furnace.

25 . The method as recited in claim 16 wherein the alkanol product is injected in a cooling zone of the furnace.

26 . The method as recited in claim 16 wherein the alkanol product is an alkanol having a chain of 1 to 5 carbons.

27 . The method as recited in claim 26 wherein the alkanol product is methanol.

28 . The method as recited in claim 26 wherein the alkanol product is ethanol.

29 . The method as recited in claim 16 wherein, prior to injection into the direct reduction furnace, the reducing gas is heated in a reducing gas preparation step, the reducing gas preparation step emitting a preparation exhaust gas which is at least partly supplied to the alkanol production step.

30 . A direct reduction plant performing the method as recited in claim 16 wherein, the direct reduction plant comprising an alkanol production unit.

Assignees

• Arcelormittal

Inventors

• Salame Sarah
• Carrier Odile
• Barros Lorenzo Jose
• Reyes Rodriguez Jon
• Andrade Marcelo
• Boulanov Dmitri
• Lu Dennis
• Tsvik George

Classifications

• C21B13/02 Primary

  in shaft furnaces · CPC title

• C21B13/0073 Primary

  Selection or treatment of the reducing gases · CPC title

• C21B2100/282

  of carbon dioxide · CPC title

• C21B2100/26

  by adding additional fuel in recirculation pipes · CPC title

• C21B2100/22

  by reforming · CPC title