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71. 发明专利

JPH05171233A METHOD FOR CHARGING COLLECTED DUST IN SMELTING REDUCTION EQUIPMENT 失效
公开(公告)号：JPH05171233A
公开(公告)日：1993-07-09
申请号：JP34509691
申请日：1991-12-26
申请人： NIPPON KOKAN KK
发明人： IWASAKI KATSUHIRO , HASEGAWA TERUYUKI , TAKAHASHI KENJI , MUROYA MASAHIRO , YAMASE OSAMU , FUKUSHIMA HIRONORI
IPC分类号： C21B11/02
摘要： PURPOSE:To produce molten iron in good yield of raw material by recovering dust generated in a smelting reduction apparatus provided with a pre-reduction furnace for iron ore through a cyclone and supplying the dust into the smelting reduction furnace. CONSTITUTION:The iron ore is charged into the fluidized bed type pre-reduction furnace 2 and high temp. reducing exhaust gas generated from the smelting reduction furnace 1 at the following process is passed through a duct 7 and the cyclone 3, and the iron ore and coke powders in the exhaust gas are recovered and introduced into the smelting reduction furnace 1 through chutes 10 and 14 by using carrier gas 11 of N2, etc. The high temp. reducing exhaust gas removing the powders by the cyclone 3 is fed into the pre-reduction furnace 2 through a duct 8, and the iron ore in the furnace is preheated and also the pre-reduced iron ore is supplied into the smelting reduction furnace 1 through a chute 5. Dust-mixed exhaust gas generated in the pre- reduction furnace 2 is fed to a cyclone 4 through a duct 9, and after separating and recovering coarse granular iron ore, this iron ore is passed through a piping 12 and introduced into the smelting reduction furnace 1 through a piping 14 together with the powder-mixed raw material from the cyclone 3 and effectively utilized as the raw material of the molten iron.

72. 发明专利

JPH04218644A FE-NI ALLOY COLD ROLLED SHEET EXCELLENT IN CLEANLINESS AND ETCHING PIERCEABILITY AND ITS MANUFACTURE 失效
公开(公告)号：JPH04218644A
公开(公告)日：1992-08-10
申请号：JP8093191
申请日：1991-03-19
申请人： NIPPON KOKAN KK
发明人： WATANABE ATSUSHI , HASEGAWA TERUYUKI , INOUE TADASHI , OKITA TOMOYOSHI , KIKUCHI YOSHITERU , MATSUNO EIJU
IPC分类号： C21C7/076 , B22D11/10 , B22D11/108 , B22D11/111 , C22C38/00 , C22C38/40 , H01J29/07
摘要： PURPOSE:To manufacture an Fe-Ni alloy cold rolled sheet excellent in cleanliness and etching pierceability by adding Al to an Fe-Ni alloy having a specified compsn. and bringing the above into reaction with slag having a specified compsn. in a ladle made of a specified refractory. CONSTITUTION:A prescribed amt. of Al is added to a desulfurized and decarburized Fe-Ni molten alloy contg. 30 to 45wt.% Ni. This addition is executed in a ladle made of an MgO-CaO series refractory contg. 20 to 40% CaO, and this alloy is successively brought into reaction with CaO-Al2O3-MgO series slag constituted of >=57% CaO+AlO3, >=0.45% CaO/(CaO+Al2O3),

73. 发明专利

JPH04218611A MANUFACTURE OF GAS INJECTING REFRACTORY FORMED BODY FOR STEELMAKING FURNACE 失效
公开(公告)号：JPH04218611A
公开(公告)日：1992-08-10
申请号：JP9344191
申请日：1991-03-30
申请人： NIPPON KOKAN KK
发明人： KIMURA SHIGETO , HASEGAWA TERUYUKI
IPC分类号： C21C5/48 , B22D1/00 , C21C7/072 , F27D3/16
摘要： PURPOSE:To obtain a formed body, in which through holes are distributed in a dense condition and large flowing rate of gas can be injected by disposing many metal pipes in the formed frame, packing non-porous refractory materials and executing pressurizing-forming or casting-forming. CONSTITUTION:The many straight metal pipes 5 having 0.1-5mm inside diameter are disposed in the dense condition in the forming frame and also the non-porous refractory materials 1 are packed. This is formed with the pressurizing-forming or the casting-forming. Since the metal pipe 5 is not deformed even with the pressurizing at the time of forming, the gas injecting refractory formed body for a steel making furnace stably forming the multiple through-holes 4 having a fixed diameter, penetrated linearly from a contact face with molten metal to a back part in the refractory forming body, is obtd. Since the through-holes are formed with the inside wall of metal pipe, even if the crack is developed in the refractory, gas leakage from the inner face of through-hole can be suitably prevented.

74. 发明专利

JPH03297537A LADLE BOTTOM BLOWING POROUS BRICK AND METHOD FOR REMOVING STUCK METAL TO THE BRICK 失效
公开(公告)号：JPH03297537A
公开(公告)日：1991-12-27
申请号：JP9857690
申请日：1990-04-13
申请人： NIPPON KOKAN KK
发明人： TADA MITSUHIRO , ISHIZAKA SHO , TASAKA HISASHI , HASEGAWA TERUYUKI
IPC分类号： B22D1/00 , C21C7/00
摘要： PURPOSE:To shorten removing time of stuck metal to a ladle bottom blowing porous brick by dividing the porous brick into columnar center part and cylindrical outskirt part and separately supplying gas at each part. CONSTITUTION:At the time of executing refining in the ladle, in order to blow inert gas for stirring molten steel from bottom part of the ladle, the ladle bottom blowing porous brick is used. Then, the porous brick is divided into the columnar center part 2 and the cylindrical outskirt part 3 with a cylindrical partitioned trick 1. Further, by using a blasing box 4 for center part and a blasting box 5 for outskirt part to each part, the gas is separately supplied. To the center part, gas containing oxygen is supplied and also to the outskirt part, inert gas is supplied to remove the stuck metal to the ladle bottom blowing porous trick. By this method, times of clogging of the ladle bottom blowing porous brick can be reduced.

75. 发明专利

JPH03248026A THERMOCOUPLE PROTECTING PIPE CHARACTERIZED BY HIGH CORROSION RESISTANCE FOR MEASURING TEMPERATURE OF MOLTEN IRON 失效
公开(公告)号：JPH03248026A
公开(公告)日：1991-11-06
申请号：JP4634790
申请日：1990-02-27
申请人： NIPPON KOKAN KK
发明人： KONDO HIROKAZU , HASEGAWA TERUYUKI
IPC分类号： G01K1/08 , C04B35/10 , C04B35/103 , C04B35/48 , F27D21/00
摘要： PURPOSE:To measure temperature continuously for a long time and even intermittently and to facilitate operation by constituting a part containing a slug line part of zircornia-based refractory, constituting a part other than the slug line part with alumina-based refractory, and providing a unitary structure for the entire refractory. CONSTITUTION:A protecting pipe part 2 at the tip side including an interface A of molten steel 11 is formed of zirconia-based refractory. A remaining protecting pipe part 3 is formed of alumina-graphite-based refractory. A thermocouple 4 is housed in the protecting pipe. The melting damage of the protecting pipe due to the slug can be prevented because the protecting pipe part including the interface of the molten steel in the protecting pipe is formed of the zirconia-based refractory and the corrosion resistance of the zirconia-based refractory is high in the case of the molten steel having a slug layer at the upper surface. The corrosion resistance of the zirconia-based refractory is high against iron oxide and manganese oxide which are formed at the interface between atmosphere and the molten steel. Therefore, the melting damage of the protecting pipe can be prevented by the same way.

76. 发明专利

JPH0278945A PROBE FOR MEASURING ACTIVITY OF SOLUTE ELEMENT IN MOLTEN METAL 失效
公开(公告)号：JPH0278945A
公开(公告)日：1990-03-19
申请号：JP23098488
申请日：1988-09-14
申请人： NIPPON KOKAN KK , OSAKA OXYGEN IND , SASABE MINORU
发明人： SASABE MINORU , HASEGAWA TERUYUKI , ISHIKAWA HIROAKI , KAWAI YOSHIHIKO , FURUTA CHIKAYOSHI , NAGATSUKA TOSHIO , MATSUSHIGE HARUHIKO
IPC分类号： G01N27/411 , G01N27/406 , G01N33/20
摘要： PURPOSE:To allow the measurement of respective electromotive forces with a piece of element by using the element for measuring a solute element formed by coating the outer periphery of a solid electrolyte having oxygen ion conductivity with such a material with which the activity of the oxidation of the solute element to be measured attains a specified value. CONSTITUTION:A counter electrode 1 of the probe for measuring activity is mounted on a housing 10 and is connected to a potentiometer via a connector 11. A standard electrode 2 is consisting of the blinded cylindrical solid electrolyte 4, an Mo wire electrode 6 which is immersed at the front end in a reference material 5 put therein and the connector 11 of which is connected to the potentiometer, and the coating 7 of such material with which the activity aMOX of the oxide MOx of the element M attains the specified value and which is applied on the surface of the electrolyte 4. A 1st equil. part A and a 2nd equil. part B appear in an electromotive force curve upon lapse of time and stabilize thereafter if the probe constituted in such a manner is immersed into a molten metal. The electromotive force E in the equil. part A corresponds to the electromotive force of the solute element in the molten metal and the electromotive force E in the equil. part B corresponds to the oxygen electromotive force in the molten metal.

77. 发明专利

JPH0273148A METHOD FOR MEASURING ACTIVITY OF SOLUTE ELEMENT IN MOLTEN METAL AND MEASURING PROBE 失效
公开(公告)号：JPH0273148A
公开(公告)日：1990-03-13
申请号：JP22433788
申请日：1988-09-07
申请人： NIPPON KOKAN KK , OSAKA OXYGEN IND , SASABE MINORU
发明人： SASABE MINORU , HASEGAWA TERUYUKI , ISHIKAWA HIROAKI , KAWAI YOSHIHIKO , FURUTA CHIKAYOSHI , NAGATSUKA TOSHIO , MATSUSHIGE HARUHIKO
IPC分类号： G01N27/411 , C21C5/28 , C21C5/46
摘要： PURPOSE:To measure the activity aM of a solute element M by charging the probe coated with material the activity of the oxide of which is a function of the solute to be measured even if the activity is not constant into a molten metal. CONSTITUTION:A standard material 5 is inserted into and brought into contact with a cylindrical solid electrolyte 4 and a coating 7 of the oxide MOx of the element M is applied to the outer side thereof to form a standard electrode 2. This material is immersed together with an electrode 1 into the molten metal (a) and the activity aM is determined. The prescribed equation of the activities aM and aMOX is obtd. in accordance with the electromotive force EMF generated in a potentiometer 3 by using the standard formation free energy DELTAGMO-MOx of the reaction when the element M and O2 are in the equil. state and the standard formation free energy DELTAGNO-NOy at the time when the element N of the standard material oxidizes and forms 1mol NOy and the Faraday's con stant. The aM becomes the function of EMF and temp. and can be measured if the aMOx is rounded as the function of the activity aM. The activity of the Mn, Cr, etc., in the molten metal is rapidly measured according to this method.

78. 发明专利

JPH0238510A METHOD FOR PREDICTION-RESTRAINING SLOPPING 失效
公开(公告)号：JPH0238510A
公开(公告)日：1990-02-07
申请号：JP18784088
申请日：1988-07-27
申请人： NIPPON KOKAN KK
发明人： MURAKI YASUNORI , HASEGAWA TERUYUKI , KOBAYASHI SHUJI
IPC分类号： C21C5/46
摘要： PURPOSE:To quickly restrain slopping without any delaying by executing picture processing and arithmetic processing to pickup-image near a steel tapping hole to predict the development of the slopping and charging slopping restrainer. CONSTITUTION:The steel tapping hole 25 in a converter 20 and the neighborhood are picked up with an image pickup device 11 and the picture processing is executed with a picture processor 12. This signal is received with an arithmetic processing unit 14 and the brightness of the steel tapping hole 25 or variety with the lapse of time is quantitatively obtd., and the development of the slopping is predicted from correlation with the pre-obtd. slopping development. This signal is received in a slag condition display device 15 to display slag foaming condition, and further, the picture of the steel tapping hole 25 and the neighborhood are monitored with a furnace condition display device 13. Based on the signal of the arithmetic processing unit 14, the slopping restrainer is charged into the converter 20 from the restrainer charging device 30. By this method, timing for charging the restrainer is made suitable and the slopping can be quickly restrained.

79. 发明专利

JPH01143747A NOZZLE HOLDING DEVICE 失效
公开(公告)号：JPH01143747A
公开(公告)日：1989-06-06
申请号：JP29773587
申请日：1987-11-27
申请人： NIPPON KOKAN KK
发明人： HASEGAWA TERUYUKI , OGURA YASUTSUGU , INAGAKI KIMIO
IPC分类号： B22D11/10 , B22D41/56
摘要： PURPOSE:To prevent leakage of molten steel at a discharging hole in a vessel by arranging an arm, which supports a nozzle and presses to the vessel, and also a pressure measuring instrument to the arm and controlling arm pressing force based on the pressure measured value. CONSTITUTION:In connecting part between a tundish 14 as the vessel and a submerged nozzle 20, a socket 24 is arranged to the short nozzle 20 and one pair of arms 30 are arranged to handles 26, 28. The pressure measuring instrument 34 of load cell, etc., is arranged to the arm 30 and connected with a control device 36 for arm driving device 32. During continuous casting, when the pressing force between the handles 26, 28 and the arm 30 lowers, the instrument 34 detects lowering of the detected pressure, and by controlling the driving device 32, the pressing force of the arm 30 is increased. By this method, as the submerged nozzle 20 is always pressed to the vessel 14 at the prescribed pressure, the leakage of the molten steel at the discharging hole in the vessel is surely prevented.

80. 发明专利

JPS62278213A METHOD FOR PREVENTING SLOPPING IN CONVERTER 失效
公开(公告)号：JPS62278213A
公开(公告)日：1987-12-03
申请号：JP11871686
申请日：1986-05-23
申请人： NIPPON KOKAN KK
发明人： YOSHIOKA KEIJI , TOYODA KOJI , HASEGAWA TERUYUKI
IPC分类号： C21C5/28 , C21C5/36
摘要： PURPOSE:To prevent slopping in a converter and to improve the operation efficiency of refining by blowing as well as to ensure stable refining by adding a material for regulating the viscosity of slag, to the charge in the converter, so as to inhibit the foaming of slag during refining by blowing. CONSTITUTION:When the amount of Si in molten pig iron in a converter is about 0.4-0.9%, a material for regulating the viscosity of slag, e.g., MgO, fluorite or CaO is added to the charge in the converter so as to regulate the viscosity of slag to 10cps. By this method, the foaming of slag is inhibited, and slopping in the converter during refining by blowing can surely be prevented.

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