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公开(公告)号：US20230167518A1
公开(公告)日：2023-06-01
申请号：US17802389
申请日：2021-02-16
发明人： Nobuhiko ODA , Yusuke FUJII , Shingo SATO , Ryo KAWABATA , Naoki KIKUCHI , Toshio SHIOTA , Ippei HIGUCHI
CPC分类号： C21C7/068 , C21C5/35 , C21C5/36 , C22C35/005 , C22C33/06
摘要： A method for producing low-carbon ferromanganese capable of achieving a high Mn yield. In producing low-carbon ferromanganese by blowing an oxidizing gas from a top-blowing lance onto a bath face of high-carbon ferromanganese molten metal accommodated in a reaction vessel provided with a top-blowing lance and bottom-blowing tuyere to perform decarburization, the slag composition during the blowing is adjusted so that a value of (CaO+MgO)/(Al2O3+SiO2) on a mass basis in the slag composition is not less than 0.4 but not more than 5.0. Also, agitation is performed under a condition that an agitation power density ε of an agitation gas blown through the bottom-blowing tuyere is not less than 500 W/t.
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公开(公告)号：US20220259686A1
公开(公告)日：2022-08-18
申请号：US17626083
申请日：2020-07-02
发明人： Yumi MURAKAMI , Nobuhiko ODA , Hidemitsu NEGISHI , Ryo KAWABATA , Naoki KIKUCHI , Yusuke FUJII
IPC分类号： C21C1/02
摘要： A dephosphorization method using a top and bottom blown converter. This method uses a converter charged with molten iron and slag, to blow an oxygen-containing gas from a top-blowing lance, supply the gas from an inlet of a blowing hole, and supply a control gas from an opening toward an axial center. This method has: a slag top-surface position measurement step, with the top surface of the molten iron measured in advance, measuring an arbitrary position in a top surface of the slag; a slag top-surface difference calculation of slag thickness difference between the measured top-surface positions of the molten iron and the slag; and a jetting condition adjustment step of, using the obtained slag thickness, adjusting a jetting condition of the gas jetted from the top-blowing lance into an appropriate range. The top-blown jetting condition is adjusted by comparing the slag thickness and the depth of a surface depression.
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公开(公告)号：US20220177987A1
公开(公告)日：2022-06-09
申请号：US17600827
申请日：2020-03-24
发明人： Shota AMANO , Yukio TAKAHASHI , Hiroto KASE , Naoki KIKUCHI
摘要： A method and system for predicting slopping in a converter occurring during decarburization refining in the converter in which molten steel is produced from a molten pig iron by blowing oxidizing gas to the molten pig iron in the converter from a top blowing lance, or optionally further blowing oxidizing gas or inert gas from a bottom blowing tuyere to perform the decarburization refining of the molten pig iron. The method includes measuring an emission spectrum of a throat combustion flame blowing out from a throat of the converter, calculating emission intensity of the measured emission spectrum at a wavelength in a range of 580 to 620 nm, and predicting the occurrence of the slopping based on a time-series change of the calculated emission intensity.
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公开(公告)号：US20200157645A1
公开(公告)日：2020-05-21
申请号：US16611674
申请日：2018-05-07
发明人： Shota AMANO , Yukio TAKAHASHI , Naoki KIKUCHI , Yuji MIKI
摘要： When the decarburization refining of molten iron is performed by top-blowing oxygen gas from the top blowing lance, the oscillation of molten iron, a bubble burst, and spitting due to the bubble burst are suppressed. A refining method for a converter includes decarburizing molten iron in the converter with a top blowing lance having Laval nozzles disposed at the lower end thereof by blowing oxygen gas on the surface of the molten iron in the converter through the Laval nozzles, in which one or both of an oxygen feeding rate from the top blowing lance and lance height LH are adjusted in such a manner that an oxygen accumulation index S(F) is 40 or less.
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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：US20210054479A1
公开(公告)日：2021-02-25
申请号：US16977378
申请日：2019-02-22
发明人： Nobuhiko ODA , Yuta HINO , Yuki TAKAKI , Yoshiaki NISHINA , Naoki KIKUCHI
摘要： A manufacturing method includes a first pulverization step of compressively pulverizing a manganese oxide-containing material containing at least manganese, calcium, silicon, iron, and phosphorus, which is used as a raw material, to form a composite in which a compound phase of nCaO.P2O5 is combined with at least one phase of a spinel phase and a calcium ferrite phase, which are ferromagnetic materials, and produce a first pulverized manganese oxide-containing material containing the composite; a first magnetic separation step of separating the first pulverized manganese oxide-containing material produced in the pulverization step into a magnetic substance and a non-magnetic substance under a magnetic force; and a step of recovering the non-magnetic substance separated in the first magnetic separation step as a manganese raw material.
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公开(公告)号：US20190048431A1
公开(公告)日：2019-02-14
申请号：US16079712
申请日：2017-02-15
发明人： Yusuke FUJII , Yoshie NAKAI , Naoki KIKUCHI , Naoya SHIBUTA , Shinichi NAGAI , Takahiko MAEDA , Yuji MIKI
摘要： A molten steel refining method includes throwing a powder to molten steel while heating the powder with a flame formed by combustion of a hydrocarbon gas at the leading end of a top blowing lance. The lance height of the top blowing lance (the distance between the static bath surface of the molten steel and the leading end of the lance) is controlled to 1.0 to 7.0 m, and the dynamic pressure P of a jet flow ejected from the top blowing lance calculated from equation (1) below is controlled to 20.0 kPa or more and 100.0 kPa or less. P=ρg× U2/2 . . . (1) wherein P is the dynamic pressure (kPa) of the jet flow at an exit of the top blowing lance, ρg the density (kg/Nm3) of the jet flow, and U the velocity (m/sec) of the jet flow at the exit of the top blowing lance.
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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：US20220372591A1
公开(公告)日：2022-11-24
申请号：US17619998
申请日：2020-05-01
发明人： Rei YAMADA , Kenji NAKASE , Yoshie NAKAI , Naoki KIKUCHI
IPC分类号： C22B1/11
摘要： 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.
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公开(公告)号：US20220154299A1
公开(公告)日：2022-05-19
申请号：US17601481
申请日：2020-04-02
发明人： Yumi MURAKAMI , Nobuhiko ODA , Yusuke FUJII , Goro OKUYAMA , Shota AMANO , Shinji KOSEKI , Shingo SATO , Yukio TAKAHASHI , Ryo KAWABATA , Naoki KIKUCHI , Atsuo YUASA
IPC分类号： C21C5/46
摘要： A top-blowing lance nozzle is configured to freely switch an adequate expansion condition so as to control an oxygen-blowing amount and a jetting velocity independently of each other without requiring a plurality of lance nozzles or a mechanically movable part. A lance nozzle is configured to blow refining oxygen to molten iron charged in a reaction vessel while a gas is blown from a top-blowing lance to the molten iron. One or more blowing holes for blowing a working gas are on an inner wall side surface of the nozzle, at a site where the lance nozzle has a minimum cross-sectional area in a nozzle axis direction or at a neighboring site of the site.
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