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US 2026/0176708 A1Published application
A method for manufacturing pig iron in an electrical smelting furnace and associated furnace
OwnerMathieu SANCHEZ, Jean-Christophe HUBERinventors
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Abstract
A method for manufacturing pig iron in a 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 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.
Claims13
1-12. (canceled)
13:
- A method for manufacturing pig iron in an electrical smelting furnace having a vessel, the method comprising the following successive steps:
- loading a 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.
2 more elements
14:
- The method according to claim 13 wherein the smelting furnace includes a roof fitting on the vessel, wherein a lance is inserted through the roof, wherein the lance is used as an injection device to inject the desulphurizing reagent directly in the pig iron layer.
15:
- The method according to claim 14 wherein the smelting furnace includes electrodes to melt the DRI product and wherein the lance is inserted in the vicinity of the electrodes.
16:
- The method according to claim 13 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.
17:
- The method according to claim 13 wherein the desulphurizing reagent is injected with a carrier-gas.
18:
- The method according to claim 13 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.
19:
- The method according to claim 13 wherein the desulphurizing reagent is injected has particles having a particle size below 3 mm.
20:
- The method according to claim 13 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.
21:
- The method according to claim 13 wherein a silicon containing material and/or a carbon containing material are added to the desulphurizing reagent prior to injecting the desulphurizing reagent.
22:
- A method for manufacturing steel wherein the pig iron manufactured according to claim 13 is transferred from the smelting furnace to a converter wherein a carbon content of the pig iron is then lowered to a value below 2.1 percent in weight by blowing oxygen to obtain liquid steel.
23:
- The method for manufacturing steel according to claim 22 wherein ferrous scraps are added to the pig iron in the converter, the ferrous scraps being melted.
24:
- An electrical smelting furnace for manufacturing pig iron comprising:
- a vessel;
- a roof fitting on the vessel;
- and
- a lance inserted through the roof of the vessel,
- the lance being configured to allow injection of a desulphurizing agent directly in a pig iron layer contained in the vessel.
3 more elements