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1. 发明专利

JP2003138312A METHOD FOR REFINING MOLTEN METAL AND TOP-BLOWING LANCE FOR REFINING MOLTEN METAL 审中-公开
公开(公告)号：JP2003138312A
公开(公告)日：2003-05-14
申请号：JP2001336567
申请日：2001-11-01
申请人： NIPPON KOKAN KK
发明人： WASHIMI FUMIHIRO , KIKUCHI YOSHITERU , KAWABATA RYO , KODAIRA SATOSHI , AKAI SHINICHI
IPC分类号： C21C5/46
摘要： PROBLEM TO BE SOLVED: To reduce splashing of molten metal and occurrence of dust at high oxygen feed rate in the high carbon range at the blowing in a converter and further, to restrain oxidization of the molten metal at low oxygen feed rate in the final stage of the blowing in the converter. SOLUTION: In the method for refining molten metal by using a top-blowing lance 1 provided with a sectorial nozzle 4 at its tip part and blowing the oxygen toward the molten metal, the refining is performed by using the top-blowing lance provided with the sectorial nozzle having a straight barrel part 5 whose length (Ls) is determined to be L

2. 发明专利

JP2003105425A TOP BLOW LANCE FOR BLOWING CONVERTER 审中-公开
公开(公告)号：JP2003105425A
公开(公告)日：2003-04-09
申请号：JP2001303266
申请日：2001-09-28
申请人： NIPPON KOKAN KK
发明人： WASHIMI FUMIHIRO , KIKUCHI YOSHITERU , KAWABATA RYO , KODAIRA SATOSHI , AKAI SHINICHI
IPC分类号： C21C5/46
摘要： PROBLEM TO BE SOLVED: To provide a top blow lance for blowing a converter, in which the adjustment range of oxygen feeding speed is extensive, the oxygen feeding speed can be freely changed according to states in the converter, iron scattering and dust generation at a high oxygen feeding speed are reduced, iron oxidation at a low oxygen feeding speed at the last stage of blowing is suppressed, and stabilization of the reaction is improved. SOLUTION: In the top blow lance 1 for blowing the converter with a Laval nozzle 4 installed on a tip, the throat diameter Dt (mm) of the Laval nozzle 4 satisfies the inequalities 90.W/n.P

3. 发明专利

JP2000309815A PRODUCTION OF MOLTEN IRON EXTRA-LOW IN Si AND EXTRA-LOW IN P 失效
公开(公告)号：JP2000309815A
公开(公告)日：2000-11-07
申请号：JP11774399
申请日：1999-04-26
申请人： NIPPON KOKAN KK
发明人： SAKURAI EIJI , WATANABE ATSUSHI , KODAIRA SATOSHI , KIKUCHI ICHIRO , TANAKA HIDESHIGE , AKAI SHINICHI
IPC分类号： C21C1/02 , C21C1/04
摘要： PROBLEM TO BE SOLVED: To solve the problems of damage to an equipment and the shortage of heat in molten iron during the refining in a converter by using slag produced in the other decarburize-refining and/or dephosphor-refining for a molten iron treatment-reacting vessel for executing the desiliconizing treatment and/or dephosphorizing treatment of the molten iron. SOLUTION: In the molten iron treatment-reacting vessel 1, the molten iron 2 to be treated with the desiliconizing or dephosphorizing and the necessary slag 3 are charged. Gas 5 for stirring is blown into the molten iron 2 from an immersion lance 4, and while stirring the molten iron 2 and the slag 3, gaseous oxygen 7 is top-blown near the surface of the slag 3 and the molten iron 2 from a top-blowing lance 6 to execute the siliconization and the dephosphorization in the molten iron 2. When the desiliconizing or dephosphorizing treatment is executed to the molten iron 2 tapped from a blast furnace, the decarburized slag 8 already used for the decarburize-refining and/or the dephosphorized slag 9 already used for the dephosphorizing treatment are added into the treatment-reacting vessel 1. In this way, the slags 8, 9 are fluidized, and the slag 3 is diluted and the content of SiO2 or P2O5 in the slag 3 is lowered and their activities are lowered.

4. 发明专利

JPH11193414A STEEL MANUFACTURING METHOD USING A PLURALITY OF CONVERTERS 失效
公开(公告)号：JPH11193414A
公开(公告)日：1999-07-21
申请号：JP36955597
申请日：1997-12-29
申请人： NIPPON KOKAN KK
发明人： TANAKA HIDESHIGE , KOMATSU YOSHIMI , KIKUCHI ICHIRO , KODAIRA SATOSHI , ARAI MANABU
IPC分类号： C21C5/28 , C21C1/02
摘要： PROBLEM TO BE SOLVED: To provide a steel-making method in which the steel making is efficiently achieved through the dephosphorization-refining and decarburization- refining using a plurality of converters, and the generated slag is minimized. SOLUTION: (a) The molten iron of

5. 发明专利

JPH10317044A CONVERTER BLOWING METHOD OF RESTRAINING STUCK METAL ON FURNACE OPENING HOLE PART 失效
公开(公告)号：JPH10317044A
公开(公告)日：1998-12-02
申请号：JP30732097
申请日：1997-11-10
申请人： NIPPON KOKAN KK
发明人： KODAIRA SATOSHI , TANAKA HIDESHIGE , IZAWA TOMOO , KIKUCHI ICHIRO , KAWASHIMA HITOSHI , TANABE HARUYOSHI , KAWABATA RYO
IPC分类号： C21C5/46 , C21C5/30
摘要： PROBLEM TO BE SOLVED: To provide a blowing method developing little stickiness of metal on a furnace opening hole part in a converter type refining furnace. SOLUTION: The blowing which is =10 kg/t-steel slag in the previous heat and restrains the slag in the furnace in the present heat to =80% of plural continued arbitrary heats. In at least one heat in plural arbitrary heats, a lance 5 providing a nozzle 7 for melting the stuck metal on the furnace opening hole part is used and blown under condition of 1-50% ratio b/a of oxygen quantity (b) for melting the stuck metal on the furnace opening hole part to oxygen quantity (a) for blowing. In such a way, the stickiness of the metal is little and the stuck metal is melted and removed. Further, the molten iron, in which P concn. is pre-dephosphorized to =40 deg. angle θ.

6. 发明专利

JPH10245615A METHOD FOR DEPHOSPHORIZING MOLTEN IRON IN CONVERTER TYPE REFINING VESSEL 失效
公开(公告)号：JPH10245615A
公开(公告)日：1998-09-14
申请号：JP6738897
申请日：1997-03-05
申请人： NIPPON KOKAN KK
发明人： TANAKA HIDESHIGE , KOMATSU YOSHIMI , KIKUCHI ICHIRO , KODAIRA SATOSHI , IZAWA TOMOO
IPC分类号： C21C5/28 , C21C1/02
摘要： PROBLEM TO BE SOLVED: To recycle iron and to smoothly dephosphorize by reusing magnetic waste produced in dephosphorization and/or decarburization. SOLUTION: (a) The slag produced in the dephosphorization and/or the decarburization is subjected to magnetic separation in advance and selected into a part containing much iron content (magnetic slag) and a part containing small iron content. (b) The part containing much iron content (magnetic slag) and molten iron are charged into a converter type refining vessel to executed the dephosphorize-refining. Further, prior to the charge of the molten iron, it is desirable to charge the part containing much iron content (magnetic slag) into the converter type refining vessel for executing dephosphorization in advance.

7. 发明专利

JPH10245614A STEELMAKING METHOD USING TWO OR MORE SETS OF CONVERTERS 失效
公开(公告)号：JPH10245614A
公开(公告)日：1998-09-14
申请号：JP6738797
申请日：1997-03-05
申请人： NIPPON KOKAN KK
发明人： KOMATSU YOSHIMI , TANAKA HIDESHIGE , KODAIRA SATOSHI
IPC分类号： C21C5/28 , C21C1/02
摘要： PROBLEM TO BE SOLVED: To provide a steelmaking method using two or more sets of converters which dephosphorize-refine molten iron in one side of the converter and charge this molten iron into the other side of converter to execute decarburize-refining within the dephosphorize-refining time. SOLUTION: (a) In one side of the converter, the molten iron having

8. 发明专利

JPH0920916A METHOD FOR SUPPRESSING EROSION OF CONVERTER REFRACTORIES 失效
公开(公告)号：JPH0920916A
公开(公告)日：1997-01-21
申请号：JP16578395
申请日：1995-06-30
申请人： NIPPON KOKAN KK
发明人： INOUE SHIGERU , TANAKA HIDESHIGE , KODAIRA SATOSHI , OGURA YASUTSUGU , KATO HISAKI , MIYATA YASUTO
IPC分类号： C21C5/44
摘要： PURPOSE: To greatly improve the life of the furnace body refractories of a converter lined with the magnesia refractories by suppressing the elusion rate of the furnace body refractories. CONSTITUTION: This method for suppressing the erosion of the converter refractories is a refining method which comprises adding magnesia raw materials to the molten slag in the converter at a ratio at which the magnesia content (weight %) in the molten slag is excessive up to the max. 10wt.% in excess of the magnesia saturation solubility (weight %) of the molten slag and adding >=10wt.% the magnesia raw materials with a magnesia clinker. The addition of the magnesia clinker is completed within 5 minutes before blowing of the converter or after the starting of the converter. The characteristic of the magnesia clinker to be added is preferably

9. 发明专利

JPH08269528A CONVERTER AND OPERATION OF CONVERTER 失效
公开(公告)号：JPH08269528A
公开(公告)日：1996-10-15
申请号：JP10037895
申请日：1995-03-31
申请人： NIPPON KOKAN KK
发明人： KATO HISAKI , INOUE SHIGERU , TANAKA HIDESHIGE , KODAIRA SATOSHI
IPC分类号： C04B35/043 , C21C5/44
摘要： PURPOSE: To provide a converter, in which the worn profile of lined refractory of converter body is uniformized and the unit consumption of the refractory can be reduced without wastefulness after using, and an operational method for the converter in such a way. CONSTITUTION: The working surface side 6a of the side wall part 6 of the converter 1 is constituted of a magnesia and carbon-based high grade refractory containing fused magnesia. Further, this back surface side 6b is constituted of a low grade refractory without containing the fused magnesia. Then, the converter having such a structure is used and in the first half of one campaign of the converter the decarburizing refining of molten iron is executed and in the latter half of one campaign of the converter the dephosphorizing refining of the molten iron is executed.

10. 发明专利

JPS6473013A DEVICE FOR OBSERVING FURNACE BODY 失效
公开(公告)号：JPS6473013A
公开(公告)日：1989-03-17
申请号：JP22978987
申请日：1987-09-16
申请人： NIPPON KOKAN KK
发明人： KODAIRA SATOSHI , NAKAMURA HIROMI
IPC分类号： C21C5/46 , F27D21/00
摘要： PURPOSE:To prevent the development of hot spot and to extend service life of a furnace lining by picture-processing the detected signal of heat ray radiated from outer surface of the furnace body using a heat ray detecting means and continuously grasping the furnace condition. CONSTITUTION:This furnace body observing device is composed of a heat ray detecting device 18 and a picture processing means 20. The said detecting means 18 detects the heat radiated from the outer face of the furnace body 10. Further, the said processing means 20 analyzes the picture of temp. distribution on the outer face of the body 10 based on the detected signal given by the above detecting means 18. Then, by this picture-analysis, the erosion state of the refractory 12 lined on the furnace body 10 is grasped.

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