A method of manufacturing molten pig iron into an electrical smelting unit

Patent metadata

Field	Value
Publication number	US-2026009095-A1
Application number	US-202218993066-A
Country	US
Kind code	A1
Filing date	Jul 29, 2022
Priority date	Jul 29, 2022
Publication date	Jan 8, 2026
Grant date	—

Abstract

A method of manufacturing molten pig iron into an electrical smelting unit. The method comprises the following successive steps: providing a directly reduced iron product feeding the DRI product into the smelting unit feeding together with the DRI product, ferrous scrap having a size lower than 80 mm, melting the DRI product and the ferrous scrap to produce molten pig iron. A method to produce liquid steel from manufactured pig iron is also provided.

First claim

What is claimed is:

1 .- 9 . (canceled)

10 . A method of manufacturing molten pig iron in an electrical smelting unit, the method comprising the following successive steps:
providing a directly reduced iron product; feeding the DRI product into the smelting unit; feeding, together with the DRI product, ferrous scrap having a size lower than 80 mm; and melting the DRI product and the ferrous scrap to produce molten pig iron.

11 . The method according to claim 10 wherein a mass fraction of ferrous scrap is from 1% to 20% by weight, based on the amount of DRI product fed in.

12 . The method according to claim 10 wherein the ferrous scrap is E40 scrap.

13 . The method according to claim 10 wherein the ferrous scraps are shredded before being fed to the smelting furnace.

14 . The method according to claim 10 wherein a carbon-bearing material is also fed to the smelting furnace.

15 . The method according to claim 14 wherein the carbon containing material is fed in an amount sufficient to reach a final carbon content of 4.0 to 4.5% in weight in the pig iron.

16 . The method according to claim 10 wherein the provided DRI product is manufactured using a reducing gas containing at least 50% in volume of hydrogen.

17 . A method for manufacturing steel employing the method as recited in claim 10 comprising the steps of:
transferring the pig iron from the smelting furnace to a converter; and
lowering a carbon content of the pig iron to a value below 2.1 percent in weight by blowing oxygen to obtain liquid steel.

18 . The method for manufacturing steel according to claim 17 wherein ferrous scraps are added to the pig iron in the converter, the ferrous scraps being melted.

Assignees

• Arcelormittal

Inventors

• Sanchez Mathieu
• Huber Jean-Christophe
• Deplechin Simon Pierre

Classifications

• C21C5/28

  Manufacture of steel in the converter {(C21C5/005 takes precedence)} · CPC title

• C21B11/10 Primary

  in electric furnaces · CPC title

• C21B2200/00

  Recycling of non-gaseous waste material · CPC title

• C21B3/04

  Recovery of by-products, e.g. slag · CPC title

• C21B13/143

  Injection of partially reduced ore into a molten bath · CPC title