公开(公告)号：US20240076755A1

公开(公告)日：2024-03-07

申请号：US18272474

申请日：2021-12-02

Applicant: JFE STEEL CORPORATION

Inventor： Shota AMANO ,  Hidemitsu NEGISHI ,  Yumi MURAKAMI ,  Futoshi OGASAWARA ,  Kenji NAKASE

IPC: C21C7/00 ,  C21C5/35 ,  C21C5/46 ,  C21C7/068

CPC classification number: C21C7/0037 ,  C21C5/35 ,  C21C5/4606 ,  C21C7/068

Abstract: A method that, regarding a process of refining molten iron, can increase the thermal margin and the amount of cold iron source to be used. A burner having jetting holes for jetting a fuel and a combustion supporting gas is provided at a leading end part of one lance that top-blows an oxidizing gas to molten iron contained in a converter-type vessel, or at a leading end part of another separate lance. A powdery auxiliary raw material or an auxiliary raw material processed into a powder form that is blown into the molten iron from the one lance or the other lance passes through a flame formed by the burner. This top-blowing lance for a converter is configured to secure a predetermined heating time and powder-fuel ratio. Also, a method for adding an auxiliary raw material and a method for refining of molten iron that use this top-blowing lance.

公开(公告)号：US20240068060A1

公开(公告)日：2024-02-29

申请号：US18271612

申请日：2021-12-09

Applicant: JFE STEEL CORPORATION

Inventor： Hidemitsu NEGISHI ,  Shota AMANO ,  Yumi MURAKAMI ,  Futoshi OGASAWARA ,  Kenji NAKASE

IPC: C21C5/32 ,  C21C1/02 ,  C21C1/04 ,  C21C5/46 ,  F27D3/16

CPC classification number: C21C5/32 ,  C21C1/02 ,  C21C1/04 ,  C21C5/46 ,  F27D3/16 ,  F27D2003/163

Abstract: Proposed is a molten iron refining method capable of securing an in-flame staying time period of a heat transfer medium without being influenced by height adjustments of a blowing-purpose oxygen-blowing lance. As far as to a position lower than an upper end inside a converter-type vessel 1, a blowing-purpose oxygen-blowing lance 3 that supplies oxidizing gas and is capable of ascending and descending and at least one burner lance 4 capable of ascending and descending independently of the blowing-purpose oxygen-blowing lance are inserted. From the blowing-purpose oxygen-blowing lance, either oxidizing gas or oxidizing gas and CaO-containing refining agent are blown onto the molten iron. Also, a flame is formed by causing the burner lance to discharge fuel gas and combustion supporting gas. Powder particles discharged from the burner lance are caused to pass through the flame and to be blown onto the molten iron in a heat-transferred state, so that the molten iron is thermally compensated.

公开(公告)号：US20240076754A1

公开(公告)日：2024-03-07

申请号：US18270617

申请日：2021-12-21

Applicant: JFE STEEL CORPORATION

Inventor： Futoshi OGASAWARA ,  Hidemitsu NEGISHI ,  Kenji NAKASE ,  Shota AMANO ,  Yumi MURAKAMI ,  Rei YOKOMORI ,  Yudai HATTORI ,  Ryo KAWABATA ,  Naoki KIKUCHI

IPC: C21C5/35 ,  C21C7/064 ,  C21C7/068

CPC classification number: C21C5/35 ,  C21C7/064 ,  C21C7/068

Abstract: A molten iron refining method having, an auxiliary material, and an oxidizing gas supplied through a top-blowing lance, to a cold iron source and molten pig iron that are contained/fed in a converter-type vessel, and molten iron is subjected to a refining process. A pre-charged cold iron source is charged into the converter-type vessel at an amount not larger than 0.15 times. A furnace-top-added cold iron source that's part or all of the cold iron source and added from a furnace top is fed during the refining process. A burner at a leading end of the top-blowing lance that spray holes through which a fuel and a combustion-supporting gas are ejected. During the refining process, a powdery auxiliary material processed into powder that's part of the auxiliary material is blown in, to pass through a flame formed by the burner.

公开(公告)号：US20220372591A1

公开(公告)日：2022-11-24

申请号：US17619998

申请日：2020-05-01

Applicant: JFE STEEL CORPORATION

Inventor： Rei YAMADA ,  Kenji NAKASE ,  Yoshie NAKAI ,  Naoki KIKUCHI

IPC: C22B1/11

Abstract: A method removes phosphorus from a phosphorus-containing substance. In the method, the phosphorus-containing substance that is used as a raw material for metal smelting or refining is reacted with a nitrogen-containing gas so that phosphorus in the phosphorus-containing substance is removed through nitriding. Prior to a treatment of a nitriding removal of phosphorus from the phosphorus-containing substance, a treatment is performed in which the phosphorus-containing substance is heated to an unmolten state temperature range so as to react with a reducing agent, thereby reducing at least a part of metal oxide in the phosphorus-containing substance.