专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明专利

JP2002339010A METHOD FOR CHARGING FLUX FOR STEELMAKING 失效
公开(公告)号：JP2002339010A
公开(公告)日：2002-11-27
申请号：JP2001146455
申请日：2001-05-16
申请人： NIPPON KOKAN KK
发明人： IZAWA TOMOO , TABATA YOSHIAKI , ISHIZAKA SHO , IKEDA MASABUMI , INOUE AKIHIKO , HINO TADAAKI
IPC分类号： C21C5/28
摘要： PROBLEM TO BE SOLVED: To provide a method for charging flux for steelmaking by which the flux for refining is made difficult to blow off with exhaust gas from a refining vessel and utilization efficiency can be improved by enabling the flux for steelmaking to come in contact with slag. SOLUTION: The flux for stelmaking composed of at least one of raw material for refining, metal oxide and powdery or granular iron is formed into a formed body 1 in which material 2 having relatively large density is unevenly distributed in a desirable portion, and charged onto molten steel in the refining vessel for steelmaking.

2. 发明专利

JP2002256319A METHOD FOR DEPHOSPHORIZING MOLTEN IRON 失效
公开(公告)号：JP2002256319A
公开(公告)日：2002-09-11
申请号：JP2001054136
申请日：2001-02-28
申请人： NIPPON KOKAN KK
发明人： SHIMIZU HIROSHI , WASHIMI FUMIHIRO , KAWABATA RYO , KIKUCHI YOSHITERU , TABATA YOSHIAKI , HINO TADAAKI , IZAWA TOMOO , INOUE AKIHIKO , IKEDA MASABUMI
IPC分类号： C21C5/32 , C21C1/02 , C21C5/46
摘要： PROBLEM TO BE SOLVED: To dephosphorize molten iron with high efficiency without developing spattering of the molten iron, such as splash, and also, promoting decarburizing reaction, by using an oxygen top-blown lance. SOLUTION: When the dephosphorizing treatment to the molten iron is performed by supplying the oxygen from the top-blown lance provided with a Laval nozzle, setting-up nozzle back pressure Po (kPa) satisfying the (1) formula to an oxygen feeding speed Fh (Nm /hr) per one hole of the Laval nozzle and a throat diameter Dt (mm) of the Laval nozzle, is decided. The top-blown lance provided with the Laval nozzle having an outlet diameter De (mm) obtained with the (2) formula from the designed nozzle back pressure Poo (kPa) multiplying this setting up nozzle pressure Po by two, an atmospheric pressure Pe (kPa) and the throat diameter Dt (mm), is used and then, the oxygen is supplied by setting up /min.T the oxygen feeding speed. Po= Fh/(0.00465×Dt )...(1) De >=0.259∼Dt /[(Pe/Poo) ×[1-(Pe/Poo) ] ]...(2).

3. 发明专利

JP2002256318A METHOD FOR DEPHOSPHORIZING MOLTEN IRON 失效
公开(公告)号：JP2002256318A
公开(公告)日：2002-09-11
申请号：JP2001054135
申请日：2001-02-28
申请人： NIPPON KOKAN KK
发明人： SHIMIZU HIROSHI , WASHIMI FUMIHIRO , KAWABATA RYO , KIKUCHI YOSHITERU , TABATA YOSHIAKI , HINO TADAAKI , IZAWA TOMOO , INOUE AKIHIKO , IKEDA MASABUMI
IPC分类号： C21C5/32 , C21C1/02 , C21C5/46
摘要： PROBLEM TO BE SOLVED: To dephosphorize molten iron with a high efficiency without developing spattering of the molten iron, such as splash, and also, promoting decarburizing reaction, by using an oxygen top-blown lance. SOLUTION: When the dephosphorizing treatment to the molten iron is performed by supplying the oxygen from the top-blown lance provided with a Laval nozzle, a setting-up nozzle back pressure Po (kPa) satisfying the (1) formula to an oxygen feeding speed Fh (Nm /hr) per one hole of the Laval nozzle and a throat diameter Dt (mm) of the Laval nozzle, is decided. The top-blown lance provided with the Laval nozzle having an outlet diameter De (mm) obtained with the (2) formula from this setting-up nozzle back pressure Po, an atmospheric pressure Pe (kPa) and the throat diameter Dt (mm), is used and then, the oxygen is supplied by setting up 0.6-2.0 Nm /min.T the oxygen feeding speed and >=Po the nozzle back pressure P. Po= Fh/(0.00465×Dt )...(1) De /[(Pe/Po) ×[1-(Pe/Po) ] ]...(2).

4. 发明专利

JP2001294927A STEEL PRODUCING METHOD 失效
公开(公告)号：JP2001294927A
公开(公告)日：2001-10-26
申请号：JP2000109132
申请日：2000-04-11
申请人： NIPPON KOKAN KK
发明人： IZAWA TOMOO , TABATA YOSHIAKI , ISHIZAKA SHO , HINO TADAAKI , IKEDA MASABUMI
IPC分类号： C22B5/06 , C21B11/00 , C21C5/28 , C21C7/00 , C21C7/072 , C22B5/10 , C22B5/12 , C22B9/05
摘要： PROBLEM TO BE SOLVED: To provide a steel producing method in which the reduction of metallic oxides can efficiently be performed without any contaminating of molten iron, molten steel, etc., with a reducing agent, an additive used for heat source in a refining process. SOLUTION: In either or both of decarburizing process and molten iron pretreating process preceded to the above process, a material containing the metallic oxide and a material containing a plastics consisting essentially of carbon and hydrogen, are charged into a reaction vessel for performing the above processes or into a molten metal transporting vessel to reduce the metallic oxide and recover as the metal.

5. 发明专利

JP2000199010A APPARATUS FOR REFINING MOLTEN STEEL AND REFINING METHOD 失效
公开(公告)号：JP2000199010A
公开(公告)日：2000-07-18
申请号：JP30406299
申请日：1999-10-26
申请人： NIPPON KOKAN KK
发明人： INOUE AKIHIKO , IKEDA MASABUMI , KUBO TAKASHI , TANAKA HIROSHI , MATSUNO EIJU , TABATA YOSHIAKI , HINO TADAAKI
IPC分类号： C21C7/10
摘要： PROBLEM TO BE SOLVED: To provide a refining apparatus of molten steel and a refining method thereof, with which a vacuum degassing treatment and a slag treatment can continuously and simultaneously be executed in the same apparatus at a high efficiency. SOLUTION: A ladle 2 storing the molten steel 3, is housed in a chamber 1, in which the pressure can be reduced, and a tube member 6, of which the lower end part can be dipped into the upper part of the molten steel 3 in the ladle 2 and the inner part can reduce the pressure, is set. The slag refining and the vacuum treatment are simultaneously and continuously executed while regulating to the suitable reduced pressure in the tube member 6 and the chamber 1.

6. 发明专利

JPH1150165A RECOVERY OF ZINC FROM IRON-MAKING DUST 失效
公开(公告)号：JPH1150165A
公开(公告)日：1999-02-23
申请号：JP21834197
申请日：1997-07-30
申请人： NIPPON KOKAN KK
发明人： IKEDA MASABUMI , HINO TADAAKI
IPC分类号： C22B7/02 , C21C5/38 , C22B19/30 , F27D17/00
摘要： PROBLEM TO BE SOLVED: To provide a method for efficiently recover zinc from iron-making dust. SOLUTION: The iron-making dust 12 having 5 wt.% moisture, is added into molten iron 4 held in a vessel 2 under an inert gas atmosphere or under reduced pressure, and stirring gas is blown into the molten iron. Iron oxide and zinc oxide are reduced with carbon in the molten iron and the iron is recovered, and exhaust gas 22 containing vaporized zinc, is cooled to recover the zinc 30. At this time, the adding speed of the iron-making dust 12 into the molten iron 4 is preferably >=50 kg/min. Further, the stirring gas is preferably blown into >=1 m depth of the molten iron.

7. 发明专利

JPH09316512A METHOD FOR MELTING STEEL USING IRON OXIDE BRIQUETTE AS AUXILIARY RAW MATERIAL 失效
公开(公告)号：JPH09316512A
公开(公告)日：1997-12-09
申请号：JP15920496
申请日：1996-05-31
申请人： NIPPON KOKAN KK , KEIHAN KK
发明人： WATANABE KYOJI , NAKATSUGAWA MANABU , KATOU NORIYASU , OKIMOTO SHINICHI , IKEDA MASABUMI , FUTAGAWA HIDEO , KOBAYASHI TADANOBU
IPC分类号： C21C5/28 , C22B1/244
摘要： PROBLEM TO BE SOLVED: To provide a melting method of a steel which efficiently charges powdery iron oxide and recovers iron content in the iron oxide in various kinds of steelmaking furnace. SOLUTION: In the steel melting method using pig iron and scrap as main raw materials and refining material, the following iron oxide briquette is used as an auxiliary raw material. The iron oxide briquette contains (a) powdery iron oxide as a main component and (b) a thermoplastic resin of 1-10wt.% based on the briquette wt. as a binder for the powdery iron oxide. As the powdery iron oxide, any one or more kinds among the iron ore, mill-scale, iron- making dust, can be used.

8. 发明专利

JPS63310912A PRODUCTION OF CAST IRON 失效
公开(公告)号：JPS63310912A
公开(公告)日：1988-12-19
申请号：JP14572587
申请日：1987-06-11
申请人： NIPPON KOKAN KK
发明人： UCHIDA SHIGETAKA , YAMASE OSAMU , IKEDA MASABUMI , NAKAJIMA HIROHISA
IPC分类号： C21C1/02 , C21C1/08
摘要： PURPOSE:To produce the title cast iron having high mechanical strength and toughness at a low cost by dephosphorizing molten iron in two stages to adjust the composition of the pretreated molten iron, and supplying the molten iron in a casting mold to cast the molten iron into a specified shape. CONSTITUTION:Blast-furnace molten iron is pretreated to reduce the content of impurities, especially phosphorus, to adjust the composition of the pretreated molten iron, and the molten iron is cast into a specified shape. In such a dephosphorizing stage, the molten iron is deslagged, the slag is removed, and the process is repeated twice. By this method, reinfiltration of phosphorus into the molten iron is practically prevented, the content of phosphorus is remarkably reduced, and the toughness can be increased. In addition, since the carbon content of the blast-furnace molten iron is close to the carbon content of the cast iron, the carbon content of the molten iron need not be sharply reduced. Moreover, since the cost of the blast-furnace molten iron itself is low, the production cost can be remarkably reduced.

9. 发明专利

JPS63274709A PRODUCTION OF CAST IRON 失效
公开(公告)号：JPS63274709A
公开(公告)日：1988-11-11
申请号：JP10684487
申请日：1987-04-30
申请人： NIPPON KOKAN KK
发明人： UCHIDA SHIGETAKA , YAMASE OSAMU , IKEDA MASABUMI , NAKAJIMA HIROHISA
IPC分类号： C21C1/02 , C21C1/04 , C21C1/08
摘要： PURPOSE:To produce a cast iron having high mechanical strength and ductility at low cost by reducing impurity content in molten iron of a blast furnace, adjusting component contents, raising molten iron temp. and casting into the prescribed shape to execute in order each process. CONSTITUTION:By blowing desiliconizing agent into the molten iron tapping from the blast furnace, Si content is reduced from about 0.3wt.% to about 0.1%, and after removing the desiliconized slag, desulfurization is executed by mechanical stirring type desulfurizing method and sulfur content is reduced from about 0.03% to about 0.001% and the desulfurized slag is removed. Next, while stirring the molten iron, oxygen source and Ca contained material are supplied and phosphorous content is reduced from about 0.1% to about 0.01% and dephosphorized slag is removed, to complete pretreatment of the molten iron. Further, after finely adjusting carbon content in the molten iron, the silicon is added, to adjust the silicon content, and the molten iron is heated and after raising the molten iron temp. to about 1,450 deg.C so as to cast, Mg is added and the casting is executed as quick as possible, to produce the product having the prescribed shape.

10. 发明专利

JPS61217687A VACUUM SKIMMING METHOD 失效
公开(公告)号：JPS61217687A
公开(公告)日：1986-09-27
申请号：JP5568285
申请日：1985-03-22
申请人： NIPPON KOKAN KK
发明人： UCHIDA SHIGETAKA , WADA TSUTOMU , MORI TAKASHI , IKEDA MASABUMI
IPC分类号： B22D1/00 , B22D37/00 , B22D43/00 , F27D3/15

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式