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

Patent metadata

Field	Value
Publication number	US-2026028687-A1
Application number	US-202218996155-A
Country	US
Kind code	A1
Filing date	Jul 29, 2022
Priority date	Jul 29, 2022
Publication date	Jan 29, 2026
Grant date	—

Abstract

A method for manufacturing pig iron in a smelting furnace 13 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 carbon containing material 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 - 14 (canceled)

15 . 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 carbon containing material directly in the pig iron layer.

16 . The method according to claim 15 wherein the smelting furnace includes a at least one tap hole provided on the vessel, a lance being inserted through the at least one tap hole to inject the desulphurizing reagent directly in the pig iron layer.

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

18 . The method according to claim 15 wherein the carbon containing material is injected with a carrier-gas.

19 . The method according to claim 15 wherein the carbon containing material is chosen from at least one of the group consisting of: coke, anthracite, silicon carbide, calcium carbide, biomass, carbon coming from the combustion of biomass and a mixture of any of those materials.

20 . The method according to claim 15 wherein the carbon containing material has particles having a particle size below 3 mm.

21 . The method according to claim 20 wherein 70 to 80% of the particles have a particle size less than or equal to 75 μm, remaining particles having a particle size less than or equal to 2 mm.

22 . The method according to claim 20 wherein the carbon containing material is previously mixed with an iron source before injection in the pig iron layer.

23 . The method according to claim 15 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.

24 . The method according to claim 15 wherein a silicon containing material and/or desulphurizing reagents are added to the carbon containing material to be injected in the pig iron layer.

25 . A method for manufacturing steel employing the method as recited in claim 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.

26 . The method for manufacturing steel according to claim 25 wherein ferrous scraps are added to the pig iron in the converter, the ferrous scraps being melted.

27 . The method for manufacturing steel according to claim 25 wherein the pig iron is being transferred from the smelting furnace to a desulphurization station before being transferred to the converter.

28 . An electrical smelting furnace for manufacturing pig iron, the furnace comprising:
a vessel, the vessel including at least one tap hole on such vessel; and a lance inserted through the at least one tap hole configured to inject a carbon-containing material directly into a pig iron layer contained in the vessel.

Assignees

• Arcelormittal

Inventors

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

Classifications

• C21C5/28

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

• C21C1/02

  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