Steelmaking method and associated network of plants

22:

• The method as recited in claim 21 wherein the hydrogen is injected in the blast furnace at a temperature comprised between 75° and 1100° C.

23:

• The method as recited in claim 21 wherein the hydrogen is injected into a shaft of the blast furnace.

24:

• The method as recited in claim 21 wherein at least one hydrogen source of the hydrogen injected into the blast furnace is a waste gas from chemical industry.

25:

• The method as recited in claim 21 further comprising a step of producing coke and a coke oven gas in a coke plant, the coke being at least partly charged into the blast furnace for the hot metal production step, the coke oven gas being a hydrogen source of the hydrogen injected into the blast furnace.

26:

• The method as recited in claim 25 wherein the reducing gas for the direct reduced iron production step includes the coke oven gas.

27:

• The method as recited in claim 21 wherein the reduction top gas is hydrogen sources of the hydrogen injected into the blast furnace.

28:

• The method as recited in claim 21 wherein the reduction top gas is at least partly injected as reductant into a shaft of the blast furnace.

29:

• The method as recited in claim 21 wherein the reduction top gas is at least partly sent to the biochemical plant to produce hydrocarbons.

30:

• The method as recited in claim 21 wherein the hydrogen is added to the blast furnace top gas before use in the biochemical plant.

31:

• The method as recited in claim 21 wherein the reducing gas for the direct reduced iron production step including at least 70% v of hydrogen.

32:

• The method as recited in claim 31 wherein said hydrogen is green hydrogen.

33:

• The method as recited in claim 21 wherein the molten metal produced in the electric furnace is transformed in liquid steel in a converter.

34:

• The method as recited in claim 21 wherein green hydrogen is injected into the blast furnace.

35:

• The method as recited in claim 21 wherein the blast furnace top gas is recycled as reductant in the blast furnace.

36:

• The method as recited in claim 21 further comprising a step of recovering all gases emitted during steel production in a gas hub and redirecting the recovered gases for recycling within the steel production process.

37:

• The method as recited in claim 21 wherein all the steps are supplied with renewable energy.

38:

• The method as recited in claim 21 wherein the hot metal is used in the electric furnace to produce molten metal.

39:

• The method as recited in claim 21 wherein scrap is used in the electric furnace to produce molten metal.