A method for manufacturing pig iron in an electrical smelting furnace and associated electrical smelting furnace

Patent metadata

Field	Value
Publication number	US-2026022429-A1
Application number	US-202218996080-A
Country	US
Kind code	A1
Filing date	Jul 29, 2022
Priority date	Jul 29, 2022
Publication date	Jan 22, 2026
Grant date	—

Abstract

A method for manufacturing pig iron in an electrical smelting furnace including a vessel 20, the method including the following successive steps: loading DRI product in the vessel, melting the DRI product to form a pig iron layer topped by a slag layer, and injecting a desulphurizing reagent directly in the pig iron layer. It also deals with the manufacturing of steel from the pig iron and the associated electrical smelting furnace.

First claim

What is claimed is:

1 - 11 . (canceled)

12 : A method for manufacturing pig iron in an electrical smelting furnace comprising a vessel, the method comprising the following successive steps:
loading DRI product in the vessel; melting the DRI product to form a pig iron layer topped by a slag layer; and injecting a desulphurizing reagent material directly in the pig iron layer.

13 : The method according to claim 12 wherein the smelting furnace includes a at least one bottom tuyere provided on the vessel, the desulphurizing reagent being injected through the at least one bottom tuyere directly in the pig iron layer.

14 : The method according to claim 12 wherein the desulphurizing reagent is injected in an amount sufficient to reach a final sulphur content of below 0.02% in weight in the pig iron layer.

15 : The method according to claim 12 wherein the desulphurizing reagent is injected with a carrier-gas.

16 : The method according to claim 12 wherein the desulphurizing reagent is chosen from at least one of the group consisting of: sodium carbonate, lime, calcium carbide, magnesium and a mixture of any of those materials.

17 : The method according to claim 12 wherein the desulphurizing reagent has particles having a particle size below 3 mm.

18 : The method according to claim 12 wherein the DRI product is manufactured using a reducing gas containing at least 50% in volume of hydrogen before being loaded in the smelting furnace.

19 : The method according to claim 12 wherein a silicon containing material and/or carbon containing material are added to the desulphurizing reagent to be injected in the pig iron layer.

20 : A method for manufacturing steel employing the method as recited in claim 12 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.

21 : The method for manufacturing steel according to claim 20 wherein ferrous scraps are added to the pig iron in the converter, the ferrous scraps being melted.

22 : An electrical smelting furnace for manufacturing pig iron comprising:
a vessel, the vessel being provided with a bottom tuyere configured to inject a desulphurizing agent directly into pig iron in the vessel.

Assignees

• Arcelormittal

Inventors

• Sanchez Mathieu
• Huber Jean-Christophe

Classifications

• C21C5/28

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

• C21C1/025

  Agents used for dephosphorising or desulfurising · CPC title

• C21B13/0073

  Selection or treatment of the reducing gases · CPC title

• C21B11/10 Primary

  in electric furnaces · CPC title

• F27D2003/185

  Conveying particles in a conduct using a fluid · CPC title