Method for manufacturing pig iron into an electrical smelting furnace and associated smelting furnace

Patent metadata

Field	Value
Publication number	US-2026022428-A1
Application number	US-202218992858-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, 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 tapping the pig iron into a ladle and adding a silicon containing material directly in the pig iron in the runner of at least one of the smelting furnace tap holes. It also deals with the manufacturing of steel from the pig iron and an 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 provided with tap holes, the method comprising the following steps:
loading a DRI product in the vessel; melting the DRI product to form a pig iron layer topped by a slag layer; tapping the pig iron into a ladle; and adding a silicon containing material directly in the pig iron in a runner of at least one of the tap holes.

13 : The method according to claim 12 wherein the silicon containing material is injected in an amount sufficient to reach a final silicon content of 0.1 to 0.4% in weight in the pig iron layer.

14 : The method according to claim 12 wherein the silicon containing material is chosen from at least one of the group consisting of: metal Silicon Si, silicon carbide SiC, silicomanganese SiMn, calcium silicate SiCa, ferro silicon alloy FeSi and a mixture of any of those materials.

15 : The method according to claim 12 wherein the silicon containing material injected has particles, the particles having a particle size below 3 mm.

16 : 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.

17 : The method according to claim 12 wherein a carbon containing material is added to the silicon containing material directly added to the pig iron.

18 : 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.

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

20 : The method for manufacturing steel according to claim 18 wherein the pig iron is transferred from the smelting furnace to a desulphurization station before being transferred to the converter.

21 : An electrical smelting furnace for manufacturing pig iron comprising:
a vessel provided with tap holes associated with at least one runner allowing to tap the manufactured pig iron into a pig iron ladle, and an injector for injecting a silicon containing material directly in the pig iron in the runner.

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 Primary

  Selection or treatment of the reducing gases · CPC title

• C21B3/02

  by applying additives, e.g. fluxing agents · CPC title

• C21B11/10 Primary

  in electric furnaces · CPC title