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11. 发明专利

JPH01240609A METHOD FOR CONTROLLING BLOWING IN CONVERTER USING MN SENSOR 失效
公开(公告)号：JPH01240609A
公开(公告)日：1989-09-26
申请号：JP6353888
申请日：1988-03-18
申请人： NIPPON KOKAN KK
发明人： ISHIKAWA HIROAKI , MIYAHARA HIROAKI
IPC分类号： C21C5/30 , C21C5/46
摘要： PURPOSE:To control blowing oxygen rate and molten steel temp. and to assume C content at the end point of refining under good accuracy by submerging the specific construction of an Mn sensor into the molten steel with a sub-lance at the time of refining the molten steel wit less slag oxygen blowing in a converter and assuming the Mn content in the molten steel from electromotive force and the molten steel temp. obtd. from the sensor. CONSTITUTION:Molten iron tapped fro a blast furnace is pre-desiliconized and dephosphorized by oxidizing with scale, etc., on the casting floor in front of the furnace and by executing the less slag oxygen bowing in the converter, the molten iron is refined into the molten steel with decarbonizing reaction. In this case, the Mn sensor having a solid electrolyte 4 of ZnO2+7% MgO, normal electrode 2 and a Mo-made measuring electrodes 1, 1' and having MnO or Mn3O4 coat 5 on the surface of the solid electrolyte 4, and a thermocouple 7 are fitted to the sub-lance and submerged into the molten-metal 8. Mn activated value in the molten metal is calculated from voltage between both electrodes 1, 1' for the sensor and the measured temp. with the thermocouple 7 for measuring the molten metal temp., and the Mn content in the molten metal 8 is assumed from this value, and further, Mn oxidizing loss at the end period of the blowing is assumed, to control the O2 blowing rate and the molten metal temp., and the content at the end point of the refining is assumed and hit to the aimed value at high accuracy.

12. 发明专利

JPH01215918A METHOD FOR DETECTING SLAG FOAMING IN CONVERTER 失效
公开(公告)号：JPH01215918A
公开(公告)日：1989-08-29
申请号：JP4058888
申请日：1988-02-25
申请人： NIPPON KOKAN KK
发明人： ISHIKAWA HIROAKI , MIYAHARA HIROAKI
IPC分类号： C21C5/46
摘要： PURPOSE:To predict the development of slag foaming and to prevent the development of slopping by measuring furnace temp. with a temp. sensor arranging at the prescribed part in a furnace body at the time of steelmaking refining with oxygen-blowing in the converter and comparing the above temp. with the slag foaming temp. CONSTITUTION:The molten iron 13 in the converter 1 is charged, and by blowing oxygen gas from the top-blowing lance 12, the carbon content is oxidized and decarbonized to produce the molten steel. In this case, by fitting the temp. sensor 15 at the upper position of steel tapping hole 14, etc., in the converter, the temp. in the furnace is continuously measured. The molten slag 17 comes to the foaming state in accordance with progressing the decarbonizing reaction and the measured temp. is raised with the temp. sensor 15, according to raise the temp. in the furnace. In this case, beforehand the developing temp. of the molten slag foaming is actually measured, and by comparing this temp., the developing of slag foaming is predicted and the development of the slag forming with the adjustment, etc., of oxygen supplying quantity from a lance 12 is prevented and the development of slopping is prevented from occurring, to stabilize the converter operation.

13. 发明专利

JPS63176411A DETECTION OF SLAG FOAMING IN CONVERTER 失效
公开(公告)号：JPS63176411A
公开(公告)日：1988-07-20
申请号：JP606087
申请日：1987-01-16
申请人： NIPPON KOKAN KK
发明人： ODA MINORU , MIYAHARA HIROAKI , ISHIKAWA HIROAKI , NARA MASATOSHI
IPC分类号： C21C5/46
摘要： PURPOSE:To predict slag foaming in an early period and to stabilize the condition of a converter by inserting a sub-lance mounted with a photodetector at the top end into the converter during converter operation and computing the fluctuation in the field area of an observation hole changing with the slag sticking near the observation hole of the photodetector. CONSTITUTION:The sub-lance 2 which has the furnace inside observation hole 3 at the top end and the photodetector 4 behind said hole is inserted into the converter and the photovideo on the inside of the converter is detected through the observation hole 3. The detection signal thereof is projected on a monitor 6 through a video processor 5. The fluctuation in the ratio at which the slag sticking and forming near the hole 3 occupies the field area of the hole 3 is computed by an arithmetic unit 7. The result of the computation is sent to a decision device 8 which compares the same with the predetermined initial field area of the hole 3 as a reference. An alarm for the generation of the slag foaming is emitted from an alarm device 9 at need according to the result thereof so that the slag foaming is prevented. The decrease in the yield of tapping by sloping and the decrease in the recovering rate of gaseous OG are thereby prevented and the oxygen blowing operation is stabilized.

14. 发明专利

JPS6372810A METHOD FOR PREVENTING SLOPPING 失效
公开(公告)号：JPS6372810A
公开(公告)日：1988-04-02
申请号：JP21773886
申请日：1986-09-16
申请人： NIPPON KOKAN KK
发明人： KURIBAYASHI AKIO , HIRANO MINORU , MIYAHARA HIROAKI , ISHIKAWA HIROAKI
IPC分类号： C21C5/28
摘要： PURPOSE:To prevent occurrence of slopping caused by foaming slag by injecting reducing agent into the foaming slag developing in a converter from a lance at the time of refining molten iron to molten steel in the converter providing a bottom blowing tuyere and the top blowing lance. CONSTITUTION:The molten iron 12 is charged into the converter 10 having the bottom blowing tuyere, and the lance 16 is descended into the converter to blow oxygen 17 on the surface of molten iron 12 from a blowing hole 22 at the constant interval, and also the oxygen is blown from the bottom blowing tuyere, to refine the molten steel as decarburizing by oxidizing C in the molten iron. Then, at the time of inserting the lance 16 in the molten slag 14 generated in the converter in foaming by viscosity and increasing its volume, it is detected by a slag level detector. And, coke powder 33 is injected in the foaming slag 14 from injecting holes 18 at outer pipe part of the lance by Ar gas through a piping 30 by driving a pump 29 to reduce the viscosity by reduction of FeO in the slag. As CO gas generated by decarburizing reaction is easily vented upward on the slag 14, the occurrence of slopping is prevented.

15. 发明专利

JPS61183405A REFINING METHOD IN CONVERTER BY BLOWING 失效
公开(公告)号：JPS61183405A
公开(公告)日：1986-08-16
申请号：JP2179485
申请日：1985-02-08
申请人： NIPPON KOKAN KK
发明人： HIRANO MINORU , ISHIKAWA HIROAKI , FUKUMI JUNICHI , TANABE HARUYOSHI , KAWAKAMI MASAHIRO
IPC分类号： C21C5/34 , C21C5/28 , C21C5/35
摘要： PURPOSE:To increase the yield of iron and to save the used amount of ferro- alloy by stopping the operation of a converter, charging a reducing agent such as coke into the converter and carrying out agitation with gas blown from the bottom to reduce effective components in slag and to transfer the resulting metals to molten steel. CONSTITUTION:At the operation of a converter having a bottom blowing function, after the gas blowing, the reducing agent such as coke or Al is charged into the converter, and agitation is carried out with gas blown from the bottom. The preferred amount of the gas blown from the bottom is >=0.04Nm /min per 1ton molten steel, and Ar, N2 or other inert gas are preferably used as the gas for blowing. By the agitation, effective components such as FeO and MnO in the slag are reduced, and the resulting metals are transferred to the molten steel. Thus, the used amount of ferroalloy is saved and the yield of iron is increased.

16. 发明专利

JPH10330831A METHOD FOR DENITRIFYING MOLTEN STEEL 失效
公开(公告)号：JPH10330831A
公开(公告)日：1998-12-15
申请号：JP14769497
申请日：1997-06-05
申请人： NIPPON KOKAN KK
发明人： MURAI TAKESHI , MATSUNO EIJU , KAWASHIMA KAZUTOSHI , ISHIKAWA HIROAKI , SAKURAI EIJI
IPC分类号： C21C7/00 , C21C7/10
摘要： PROBLEM TO BE SOLVED: To produce an extra-low nitrogen molten steel having the same grade as the conventional method in shorter treating time than the conventional method by blowing gas into molten steel from the side wall of a vacuum lower vessel in an RH degassing equipment. SOLUTION: While supplying desulrizing agent into the molten steel 2a in an uptake tube 4, the molten steel in the lower extending direction of the uptake tube 4 or the molten steel 2a' in the upper extending direction thereof, inert gas and/or CO gas are blown into the molten steel 2b in the vacuum vessel from the lower vessel side wall of the vacuum vessel 6. Desirably, the dephosphorizing agent contains CaO and the injecting speed WCa O' (kg/min/ton) of this CaO content satisfies 1.75×10 CS Q/W ) of the lower vessel].

17. 发明专利

JPH10317049A METHOD FOR MELTING HIGH CLEAN STEEL 失效
公开(公告)号：JPH10317049A
公开(公告)日：1998-12-02
申请号：JP12988997
申请日：1997-05-20
申请人： NIPPON KOKAN KK
发明人： SAKURAI EIJI , KAWASHIMA HITOSHI , ISHIKAWA HIROAKI , SUGIYAMA SHINICHI , KUBOTA ATSUSHI , YOSHIOKA KEIJI
IPC分类号： C21C7/04 , C21C7/06
摘要： PROBLEM TO BE SOLVED: To provide a method for melting a high cleanliness steel having small non-metallic inclusion by combining a converter and an RH degassing method. SOLUTION: Molten steel 3 is tapped from the converter 1 under unoxidizing condition and T.Fe content in slag is regulated to =10 Nl/min ton of molten steel by the RH degassing method, the oxygen concn. in the molten steel is measured. Then, a carbon-containing material 6 is added into the molten steel 3 until the oxygen concn. in the molten steel becomes

18. 发明专利

JPH03297553A METHOD FOR OPERATING LADLE USING ALUMINA/ALUMINA-SPINEL QUALITY REFRACTORY 失效
公开(公告)号：JPH03297553A
公开(公告)日：1991-12-27
申请号：JP9858090
申请日：1990-04-13
申请人： NIPPON KOKAN KK
发明人： ISHIKAWA HIROAKI , WATANABE TOSHIO
IPC分类号： B22D41/00 , B22D41/02 , B22D43/00
摘要： PURPOSE:To eliminate restriction of steel receiving quantity by charging lime into molten steel poured in a ladle and removing deoxidation products on an alumina/alumina-spinel quality refractory surface layer. CONSTITUTION:In the operation of ladle using the alumina/alumina-spinel quality refractory, build-up layer generated by the deoxidation product stuck to surface of the alumina/alumina-spinel quality refractory is reacted with the lime charged into the molten steel poured in the ladle and melted. By this method, the restriction of steel receiving caused by developing the build-up layer can be eliminated and breaking work of the refractory at the time of repairing does not need labor and time so much.

19. 发明专利

JPS63161111A METHOD FOR DETECTING SLAG LEVEL IN CONVERTER 失效
公开(公告)号：JPS63161111A
公开(公告)日：1988-07-04
申请号：JP30622886
申请日：1986-12-24
申请人： NIPPON KOKAN KK
发明人： ISHIKAWA HIROAKI , NAGAMUNE AKIO , MIYAHARA HIROAKI
IPC分类号： C21C5/46
摘要： PURPOSE:To quickly, surely and quantitatively detect slag level in a converter by emitting monocycle pulse wave to slag on the molten steel surface and measuring the time after emission to return back by reflection. CONSTITUTION:A built-in antenna 4 in the water-cooled box 3 is set at the upper part of hood 2 in the converter 1. The antenna 4 emits monocycle pulse wave A to the slag 10 in the converter 1 through a hole 2a of hood 2. The reflective wave of monocycle pulse wave A returned back by reflecting on the slag 10 surface is received and the time from emission to receive is measured. From this time, the distance from the antenna 4 to the slag 10 surface is operated. Laser controller 5, image converting device 6 and monitor 7 are connected to the antenna 4. Further, from the distance from the antenna 4 and the slag surface, the slag level of foamed slag 10 is detected.

20. 发明专利

JPS6347323A DETECTION OF SLAG LEVEL 失效
公开(公告)号：JPS6347323A
公开(公告)日：1988-02-29
申请号：JP19028886
申请日：1986-08-13
申请人： NIPPON KOKAN KK
发明人： KURIBAYASHI AKIO , HIRANO MINORU , MIYAHARA HIROAKI , ISHIKAWA HIROAKI
IPC分类号： C21C5/46
摘要： PURPOSE:To enable quick and exact quantitative detection of a slag level by providing plural magnetic field generating coils are receiving coils horizontally and stepwise so as to face each other to the wall of a converter and measuring continuously the current values of the magnetic fields generated in the converter. CONSTITUTION:The magnetic field generating coils 4a-4c parted from each other at prescribed spacings are embedded horizontally in multiple stages to one side of the wall 1a of the converter 1 above the surface of a molten steel 2. The receiving coils 6a-6c are embedded horizontally in multiple stages to the other side of the wall 1a so as to face the coils 4a-4c. ACs are supplied from respective power sources 5a-5c to the magnetic field generating coils 4a-4c constituted in the above-mentioned manner to generate the magnetic fields A, B, C. The magnetic fields A, B, C are continuously measured by the receiving coils 6a-6c opposite to said coils and are displayed on ammeters 8a-8c via amplifiers 7a-7c. The current values of the magnetic fields C, B, A change successively when the foaming of the slag 3 in the converter 1 progresses. The slag level in the converter 1 is thus exactly detected and slopping is prevented.

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