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1. 发明专利

JP2003213313A METHOD FOR DESULFURIZING MOLTEN IRON 审中-公开
公开(公告)号：JP2003213313A
公开(公告)日：2003-07-30
申请号：JP2002012856
申请日：2002-01-22
申请人： NIPPON STEEL CORP
发明人： YAMADA WATARU , IDEMOTO YOJI , AKI HIROSHI , TOKI MASAHIRO
IPC分类号： C21C1/02
摘要： PROBLEM TO BE SOLVED: To provide a desulfurizing method of the molten iron with which high desulfurizing ratio can be achieved by promoting entrapment of desulfurizing agent into molten iron, by adding the desulfurizing agent into a vessel including the molten iron and by mechanical stirring using an impeller. SOLUTION: In the method for applying the desulfurizing treatment by adding the desulfurizing agent into the molten iron in the vessel and stirring, it is desirable to add the desulfurizing agent in which CaO concentration in the desulfurized slag after this treatment, is ≥40 mass%, and the shape having ≥70% slag mass-ratio after this treatment, appears granular-state whose size is 3 to 20 mmϕ diameter expresed in terms of the sphere and specific gravity is ≥3.5, and further, the component is adjusted so that the liquid phase ratio at the treating temperature becomes 5 to 30%. COPYRIGHT: (C)2003,JPO

2. 发明专利

JP2002256326A METHOD FOR REFINING MOLTEN IRON 失效
公开(公告)号：JP2002256326A
公开(公告)日：2002-09-11
申请号：JP2001059455
申请日：2001-03-05
申请人： NIPPON STEEL CORP
发明人： IDEMOTO YOJI , KITAMURA SHINYA , SASAKI NAOTO
IPC分类号： C21C5/35 , C21C1/02 , C21C5/36
摘要： PROBLEM TO BE SOLVED: To provide a method with which unit requirement of lime and the amount of discharge of slag to the outside of the system are reduced to the lower limits by reusing the slag and also, only slag having extremely small amount of non-slagging lime can be discharged to the outside of the system. SOLUTION: In a steelmaking method by using two sets of refining furnaces, in which the one side is used for a decarburizing furnace and the other side is used for molten iron dephosphorizing furnace, in the decarburizing furnace, while leaving the whole or a part of the decarburized slag produced in this decarburizing furnace, the decarburize-refining is performed to the molten iron refined in the molten iron dephosphorizing furnace. In the molten iron dephosphorizing furnace, while leaving the whole or a part of the dehosphorized slag produced in this molten iron dephosphorizing furnace, a process for refining a blast furnace molten iron or the molten iron applying a desiliconizing treatment and/or a desulfurizing treatment, is preformed at least one time.

3. 发明专利

JP2002129220A METHOD FOR DEPHOSPHORIZING MOLTEN IRON WITH HIGH REACTION EFFICIENCY 失效
公开(公告)号：JP2002129220A
公开(公告)日：2002-05-09
申请号：JP2000324520
申请日：2000-10-24
申请人： NIPPON STEEL CORP
发明人： SASAKI NAOTO , IDEMOTO YOJI , KITAMURA SHINYA
IPC分类号： C21C5/35 , C21C1/02 , C21C5/36
摘要： PROBLEM TO BE SOLVED: To provide a method enabling a high speed refining with the high reaction efficiency while restraining slopping without using halogenide, such as fluorite as the typical example. SOLUTION: In a dephosphorizing treatment with lime and oxygen and/or iron oxide by using a refining furnace having a top-bottom combined-blown function, slag basicity is regulated to 0.8-1.8, (T.Fe) is regulated to 8-19 mass% and (S) is regulated to

4. 发明专利

JP2002105526A METHOD FOR DEPHOSPHORIZING MOLTEN IRON GENERATING LITTLE NON-SLAGGING LIME 失效
公开(公告)号：JP2002105526A
公开(公告)日：2002-04-10
申请号：JP2000296785
申请日：2000-09-28
申请人： NIPPON STEEL CORP
发明人： KITAMURA SHINYA , IDEMOTO YOJI , SASAKI NAOTO
IPC分类号： C21C5/35 , C21C1/02
摘要： PROBLEM TO BE SOLVED: To provide a method by which added lime is fully melted without using a halogenide, typically fluorite, and also, dephosphorization-refining generating little erosion of a refractory can be performed. SOLUTION: In the dephosphorizing treatment of molten iron using a refining furnace having a top and bottom-combined blowing function, this method generating little non-slagging lime, is characterized in that the slag basicity is made to 0.8-1.8, T.Fe in the slag is made to 8-19 mass% and the unit requirement of bulky lime source having >=10 mm is made to

5. 发明专利

JPH1180826A LOW SILICON STEEL AND PRODUCTION THEREOF 失效
公开(公告)号：JPH1180826A
公开(公告)日：1999-03-26
申请号：JP23589997
申请日：1997-09-01
申请人： NIPPON STEEL CORP
发明人： NAKADA MASAHIRO , IDEMOTO YOJI , TAKAHASHI HIROMI
IPC分类号： B22D11/00 , C21C7/00 , C21C7/04 , C21C7/076
摘要： PROBLEM TO BE SOLVED: To provide a steel having component system which can cast the low Si steel by using Al addition without developing the problem even in a billet continuous caster, and a producing method thereof. SOLUTION: In the low Si steel containing by wt.% of >=0.010% Al and =0.005%. The producing method of this low Si steel is executed by adjusting the slag composition before adding Ca to the following composition. (a) CaO/SiO2 is made to >=5 and (b) SiO2 made to

6. 发明专利

JPH0941017A METHOD FOR MELTING FERROUS SCRAP 失效
公开(公告)号：JPH0941017A
公开(公告)日：1997-02-10
申请号：JP20000295
申请日：1995-08-04
申请人： NIPPON STEEL CORP
发明人： KITAMURA SHINYA , IDEMOTO YOJI
IPC分类号： C21C5/28 , C21B11/00
摘要： PROBLEM TO BE SOLVED: To enhance a secondary combustion rate and to improve scrap melting efficiency by providing an oxygen blowing lance with cooling gas ejection holes above the ejection holes of the lance and blowing gases, such as N2 and CO2 , from these holes at the time of melting the ferrous scrap by using a top blown converter type melting furnace. SOLUTION: The top blowing lance 1 is provided with the cooling gas ejection holes 3 separately from the oxygen-contg. gas ejection holes. The cooling gas ejection holes 3 are disposed in at least one piece, more preferably 4 to 20 pieces on the peripheral surface of the range where the distance H2 from the bottom end face of the lance 1 to the center of the ejection holes attains 0.2H1 =2 kinds of N2 , Ar, Co and CO2 are blown at a rate corresponding to 5 to 30% of the supplying rate (Nm /h) of the oxygen-contg. gas. One or >=2 kinds of Mg, CO3 , CaCO3 or coal powder contg. >=20wt.% volatile content or >=5wt.% moisture are blown together with the cooling gases.

7. 发明专利

JPH07316620A STEELMAKING METHOD IN CONVERTER 失效
公开(公告)号：JPH07316620A
公开(公告)日：1995-12-05
申请号：JP11159994
申请日：1994-05-25
申请人： NIPPON STEEL CORP
发明人： OGAWA YUJI , YANO MASATAKA , IDEMOTO YOJI
IPC分类号： C21C5/28
摘要： PURPOSE:To provide an efficient reusing method of hot state decarburized slag by executing quick deoxidizing treatment to the decarburized slag. CONSTITUTION:The whole quantity of the decarburized slag produced at the time of executing a decarburizing treatment in a converter is remained in the converter, and 5-10% of the molten iron necessary for the next charge are precedingly charged. After completing the charge, the charged molten iron is left as it is for 2-3min, the reduction treatment to the iron oxide in the decarburized slag is executed by carbon in the molten iron and, thereafter, the remained molten iron is charged. Further, after executing the decarburizing treatment in the converter, >85% to

8. 发明专利

JP2004115910A Method for refining molten iron 审中-公开
公开(公告)号：JP2004115910A
公开(公告)日：2004-04-15
申请号：JP2003310276
申请日：2003-09-02
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： OGAWA YUJI , IDEMOTO YOJI
IPC分类号： C21C1/02 , C21C5/32
摘要： PROBLEM TO BE SOLVED: To provide a method for producing low-phosphorous steel by stable, high efficiency dephosphorization refining.
SOLUTION: In the method for refining molten iron by performing the addition of flux and the top-blowing of oxygen, the converting condition of the dephosphorization flux into molten slag with the lapse of time is grasped by using a slag forming detection means. On and after the conversion of the flux into the molten slag, one or more selected from the flow rate of top-blown oxygen, the height of the top-blowing lance, the diameter of the nozzle throat part in the top-blowing lance and the number of nozzles in the lance are controlled so that the top-blown oxygen is not directly contacted with the molten iron due to blocking by slag.
COPYRIGHT: (C)2004,JPO

9. 发明专利

JP2001234223A METHOD FOR REFINING CONVERTER TYPE MOLTEN PIG IRON DEPHOSPHORIZATION FURNACE 失效
公开(公告)号：JP2001234223A
公开(公告)日：2001-08-28
申请号：JP2000040573
申请日：2000-02-18
申请人： NIPPON STEEL CORP
发明人： KITAMURA SHINYA , SASAKI NAOTO , IDEMOTO YOJI
IPC分类号： C21C5/36 , C21C1/02
摘要： PROBLEM TO BE SOLVED: To execute a molten pig iron dephosphorization treatment with a little quicklime unit requirement and without using halide. SOLUTION: In the method for executing the molten pig iron dephosphrization treatment by the quicklime and oxygen and/or iron oxide in a top and bottom blown converter, a stage of tapping the molten pig iron while allowing dephosphorization slag to remain wholly or partly in the furnace after the end of the dephosphorization treatment, then charging the molten pig iron of the next charge into the furnace in the state of allowing the dephosphorization slag to remain and subjecting the molten pig iron to the dephosphorization is executed at least >=1 times. The slag basicity at the end of the dephosphorization treatment is preferably regulated to 1.5 to 3 and the [Si] concentration in the molten pig iron to be charged to

10. 发明专利

JP2000309831A METHOD FOR REMOVING ZINC FROM STEELMAKING DUST 失效
公开(公告)号：JP2000309831A
公开(公告)日：2000-11-07
申请号：JP11564999
申请日：1999-04-23
申请人： NIPPON STEEL CORP
发明人： IDEMOTO YOJI , OGAWA YUJI , KITAMURA SHINYA , TOKUMITSU NAOKI
IPC分类号： C22B3/04 , C21C5/40 , C22B7/02 , C22B19/20 , F27D17/00
摘要： PROBLEM TO BE SOLVED: To efficiently remove zinc component by restraining the elution of the iron component from steelmaking dust produced in a steelmaking furnace, such as a converter, molten iron pretreating furnace and containing a low concn. of zinc. SOLUTION: This zinc removing method is successively executed as the following processes, i.e., a process in which the steelmaking dust containing the zinc is contact-mixed with water while stirring by blowing air in a reaction vessel, a process in which the hydrogen ion concn. in the water is adjusted to pH 3-6 to elute the zinc component in the dust into the solution side, a process in which the water dissolving the zinc and the iron-containing dust are separated, and a process in which the zinc component is deposited and separated by adjusting the hydrogen ion concn. in the water dissolving the zinc into a pH of 6 to 9.

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