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公开(公告)号：US20240076754A1
公开(公告)日：2024-03-07
申请号：US18270617
申请日：2021-12-21
发明人： Futoshi OGASAWARA , Hidemitsu NEGISHI , Kenji NAKASE , Shota AMANO , Yumi MURAKAMI , Rei YOKOMORI , Yudai HATTORI , Ryo KAWABATA , Naoki KIKUCHI
摘要： 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.
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公开(公告)号：US20240191315A1
公开(公告)日：2024-06-13
申请号：US18287140
申请日：2022-04-08
发明人： Futoshi OGASAWARA , Ryo KAWABATA
CPC分类号： C21C5/5217 , C21C7/0037
摘要： An electric furnace has a burner directed toward furnace contents. The burner includes a powder-feeding pipe, a jet hole for jetting a fuel, and a jet hole for jetting combustion-supporting gas. Hydrogen gas or a hydrogen-enriched gaseous fuel is jetted as the fuel to form a burner flame. An auxiliary material is jetted through the powder-feeding pipe so that the auxiliary material passes through an inside of the burner flame. According to a steelmaking method, an electric furnace has a burner that includes a jet hole for jetting a fuel and a jet hole for jetting combustion-supporting gas and that jets a flame through the jet holes toward an inside of the electric furnace. Hydrogen gas or a hydrogen-enriched gaseous fuel is used as the fuel of the burner, and an auxiliary material is blown in to pass through an inside of the flame formed by the burner.
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公开(公告)号：US20230316489A1
公开(公告)日：2023-10-05
申请号：US18005968
申请日：2021-07-28
IPC分类号： G06T7/00 , G06V20/70 , G06V10/774 , G06T7/10
CPC分类号： G06T7/0004 , G06V20/70 , G06V10/774 , G06T2207/20212 , G06T2207/20081 , G06T2207/30136 , G06T7/10
摘要： A scrap discrimination system and a scrap discrimination method that can improve scrap discrimination technology are provided. A scrap discrimination system includes a scrap part extraction model (221) that extracts, based on a camera image, a scrap part located in a central portion included in the camera image with reference to a window (107) defined in advance in an image, a scrap discrimination model (222), generated by teacher data including training images, that sorts grades of scrap and a ratio of each grade from a scrap image extracted by the scrap part extraction model (221), and an output interface (24) that outputs information on the grades of scrap and the ratio of each grade as discriminated based on the scrap image using the scrap discrimination model (222).
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公开(公告)号：US20230304110A1
公开(公告)日：2023-09-28
申请号：US18022791
申请日：2021-08-23
CPC分类号： C21C7/0025 , C21C5/28 , C21C7/068
摘要： A method for producing chromium-containing molten steel from a raw material including a chromium-containing raw material includes a first step in which a slag basicity before rough decarburization by oxygen blowing is adjusted to be not less than 1.5 and not more than 3.0, a slag basicity after rough decarburization by oxygen blowing is adjusted to be not less than 2.0 and not more than 3.5, and then tapping is performed while slag containing a chromium oxide generated by the oxygen blowing is made to remain in the furnace, and a second step in which the slag containing a chromium oxide made to remain is reduced by using a carbon source or a metal source newly added into the same furnace so that chromium is recovered into molten steel. The slag basicity is determined by dividing a CaO concentration by an SiO2 concentration on a mass basis in the slag.
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公开(公告)号：US20240229177A1
公开(公告)日：2024-07-11
申请号：US18563597
申请日：2022-04-19
发明人： Futoshi OGASAWARA , Ryo KAWABATA
CPC分类号： C21C7/064 , C21C1/02 , C21C5/54 , C21C7/072 , C21C2300/08
摘要： A method for dephosphorization of molten iron includes, while blowing a hydrogen gas, a hydrocarbon gas, or a mixture of these gases into molten iron held in a vessel, supplying a slag-forming agent and an oxygen source to perform a dephosphorization treatment of the molten iron and obtain dephosphorized molten iron, and after the dephosphorization treatment, separating slag floating on a surface of the dephosphorized molten iron from the dephosphorized molten iron. In this method for dephosphorization of molten iron, before the dephosphorization treatment, when obtaining molten iron by melting a cold iron source in a melting furnace and discharging the molten iron from the melting furnace into the vessel, one or both of the following are performed: separating generated slag from the molten iron before the discharge; and separating slag that has flowed into the vessel along with the molten iron from the molten iron.
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公开(公告)号：US20240068061A1
公开(公告)日：2024-02-29
申请号：US18270606
申请日：2021-12-17
发明人： Rei YOKOMORI , Futoshi OGASAWARA , Ryo KAWABATA , Naoki KIKUCHI , Yudai HATTORI
CPC分类号： C21C7/072 , C21C1/02 , C21C5/28 , C21C7/068 , C21C2300/08
摘要： A converter steelmaking method has molten pig iron subjected to dephosphorization process for dephosphorized molten iron, dephosphorized molten iron is subjected to decarburization process for molten steel. For dephosphorization process, a first cold iron source in amount meeting Formula (1) is charged into first converter-type vessel, then undephosphorized molten pig iron is charged and subjected to dephosphorization process. Dephosphorized molten iron is discharged and held in molten metal receiving vessel. After second cold iron source is charged into first converter-type vessel in which dephosphorization process has been performed, the dephosphorized molten iron held in molten metal receiving vessel is charged and subjected to decarburization process. % Ws0≤0.1186T−134 (% Ws0≥0) . . . (1), where % Ws0: a ratio (%) of first cold iron source to sum of first cold iron source and charge amount of undephosphorized molten pig iron, and T: a temperature (° C.) of undephosphorized molten pig iron.
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公开(公告)号：US20230173546A1
公开(公告)日：2023-06-08
申请号：US17997368
申请日：2021-04-23
CPC分类号： B07C5/3422 , G06T7/62 , H04N23/69 , Y02P10/20 , B07C2501/0054
摘要： Provided are a scrap determination system and method that can improve scrap determination techniques. A scrap determination system (1) comprises: a first scrap determination model (221) generated using teaching data including first learning images, and determines, based on a camera image, grade of scrap in the image and a ratio of the grade; a second scrap determination model (222) generated using teaching data including second learning images, and determines, based on the image, grade of scrap in the image and a ratio of the grade; a selection model (223) configured to determine which of the first scrap determination model (221) and the second scrap determination model (222) is to be used, based on the image; and an output section (24) configured to output information of each grade of scrap and a ratio of the grade determined based on the image using the model selected by the selection model (223).
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公开(公告)号：US20240271233A1
公开(公告)日：2024-08-15
申请号：US18289918
申请日：2022-04-19
发明人： Futoshi OGASAWARA , Ryo KAWABATA
摘要： A method for refining molten iron that can stably produce low-nitrogen steel is proposed. In this method for refining molten iron, untreated molten iron with a carbon concentration [C]i between 0.5 mass % and 3.0 mass %, both inclusive, is placed into a vessel, and oxygen is blown onto the untreated molten iron under atmospheric pressure while a hydrogen gas, a hydrocarbon gas, or a mixture gas of these gases is blown in to perform a decarburization and denitrification treatment of the untreated molten iron. It is preferable, for example, that a nitrogen concentration [N]f in treated molten iron after being subjected to the decarburization and denitrification treatment be 30 mass ppm or lower; that treated molten iron after being subjected to the decarburization and denitrification treatment be further subjected to a vacuum degassing treatment; that the untreated molten iron include molten iron obtained by melting a cold iron source; that the untreated molten iron be a mixture of primary molten iron obtained by melting a cold iron source in a melting furnace and molten pig iron having a carbon concentration of 2.0 mass % or higher; that the cold iron source include reduced iron; and that the vessel be a converter.
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9.发明公开公开(公告)号：US20240076755A1
公开(公告)日：2024-03-07
申请号：US18272474
申请日：2021-12-02
CPC分类号： C21C7/0037 , C21C5/35 , C21C5/4606 , C21C7/068
摘要： 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.
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公开(公告)号：US20240068060A1
公开(公告)日：2024-02-29
申请号：US18271612
申请日：2021-12-09
摘要： 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.
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