US 12,173,376 B2
Method of manufacturing iron in a metallurgical vessel
Hendrikus Koenraad Albertus Meijer, Bergen (NL); Petrus Gerardus Jacobus Broersen, Lisse (NL); and Johan Willem Koenraad Van Boggelen, Alkmaar (NL)
Assigned to TATA STEEL NEDERLAND TECHNOLOGY B.V., Velsen-Noord (NL)
Appl. No. 17/418,472
Filed by TATA STEEL NEDERLAND TECHNOLOGY B.V., Velsen-Noord (NL)
PCT Filed Mar. 3, 2020, PCT No. PCT/EP2020/055550
§ 371(c)(1), (2) Date Jun. 25, 2021,
PCT Pub. No. WO2020/193086, PCT Pub. Date Oct. 1, 2020.
Claims priority of application No. 19164537 (EP), filed on Mar. 22, 2019.
Prior Publication US 2022/0081733 A1, Mar. 17, 2022
Int. Cl. C21B 3/02 (2006.01); C21B 13/00 (2006.01)
CPC C21B 3/02 (2013.01) [C21B 13/008 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of manufacturing iron in a metallurgical vessel, said vessel comprising a bath of molten iron with a layer of slag on top of the bath of molten iron,
wherein a metalliferrous feed, carbon containing material, fluxing material, and oxygen or an oxygen-containing gas are introduced into the vessel during the manufacturing of iron to convert the metalliferrous feed into molten iron that is collected in the bath of molten iron and continuously or semi-continuously tapped from the vessel through an iron-outlet of the vessel, and
wherein the composition of the fluxing material is selected to acquire a predetermined slag chemistry, which slag is regularly tapped out of the vessel through a slag-outlet, the vessel being provided with a cyclone,
wherein the fluxing material comprises slag derived from a steelmaking process,
wherein the particle size of the slag derived from a steelmaking process is less than 3 mm;
wherein the slag derived from the steelmaking process is not mixed with the metalliferrous feed before introducing into the vessel, and/or
wherein the slag derived from the steelmaking process is introduced into the vessel via and/or below the cyclone.