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61. 发明专利

JPS6328810A SMELTING AND REDUCING METHOD 失效
公开(公告)号：JPS6328810A
公开(公告)日：1988-02-06
申请号：JP16989986
申请日：1986-07-21
申请人： NIPPON KOKAN KK
发明人： YAMADA KENZO , USUI TSUTOMU , IWASAKI KATSUHIRO , INOUE SHIGERU , TANABE HARUYOSHI , KAWAKAMI MASAHIRO , FUKUMI JUNICHI
IPC分类号： C21B11/00
摘要： PURPOSE:To remarkably improve the thermal efficiency of a smelting and reducing reaction furnace by blowing up molten slag in the form of liquid drops into the secondary combustion zone in the furnace and causing the secondary combustion of the in-furnace gas at the time of producing a molten iron by using iron ore, reducing agent and auxiliary materials in said furnace. CONSTITUTION:The iron ore, carbonaceous material, slag forming agent, etc., are charged into the reaction furnace 1 of a reverberatory furnace type and gases such as C3H8 and O2 are blown from bottom tuyeres 5 into the furnace. The above- mentioned raw materials are heated and melted by the combustion of the C3H8 and the iron ore is reduced by the carbonaceous material, by which the molten iron 2 and the molten slag 3 are formed. Combustible gases contg. CO, H2, etc., exist as the reactive exhaust gas in the furnace. Gaseous oxygen is blown from an O2 introducing port 6 in the upper part of the furnace to cause the secondary combustion of the combustible gases in the furnace to increase the temp. Powders of CaO, MgO, etc., are blown diagnoally upward with a gas such as O2, N2 as a carrier gas from a nozzle 4 provided at the slag line part into the molten slag 3 and are splashed in the form of liquid drops 7 of the slag into the furnace, by which the temp. thereof is increased and the freshly charged raw materials such as ore are heated. The reaction furnace is thus operated with the good thermal efficiency.

62. 发明专利

JPS62280313A MELT REDUCTION METHOD 失效
公开(公告)号：JPS62280313A
公开(公告)日：1987-12-05
申请号：JP12224686
申请日：1986-05-29
申请人： NIPPON KOKAN KK
发明人： YAMADA KENZO , USUI TSUTOMU , IWASAKI KATSUHIRO , INOUE SHIGERU , TANABE HARUYOSHI , KAWAKAMI MASAHIRO , FUKUMI JUNICHI
IPC分类号： C21B11/00
摘要： PURPOSE:To efficiently transmit the heat generated by secondary combustion to a metal bath by burning a carbonaceous material by gaseous O2 so that ore is reduced by melting and splashing the formed metal as splashes to a secondary combustion zone by a gas contg. ore powder. CONSTITUTION:The carbonaceous material and ore are charged into the furnace 1 of the melt reduction furnace. On the other hand, the gaseous O2 is blown from bottom blowing tuyeres 6, etc., into the furnace to burn the above- mentioned carbonaceous material and to reduce the above-mentioned ore by melting, by which the metal bath 2 and slag 3 are formed. The gaseous CO formed by the combustion is secondarily burned by the gaseous O2 blown from tuyeres 4 and the metal bath 2 is heated by the heat generated by the combustion. The gaseous O2 contg. the ore powder is blown from tuyeres 5 to form splashes provided at the position at the height of the metal bath 2 in the above- mentioned operation. The metal of the metal bath 2 is easily splashed as splashes to the secondary combustion zone by the kinetic energy of the ore powder and the gas. The splashes of the metal efficiently absorb the heat generated by the secondary combustion and recover the same in the metal bath 2.

63. 发明专利

JPS62280311A MELT REDUCTION METHOD 失效
公开(公告)号：JPS62280311A
公开(公告)日：1987-12-05
申请号：JP12224486
申请日：1986-05-29
申请人： NIPPON KOKAN KK
发明人： YAMADA KENZO , USUI TSUTOMU , IWASAKI KATSUHIRO , INOUE SHIGERU , TANABE HARUYOSHI , KAWAKAMI MASAHIRO , FUKUMI JUNICHI
IPC分类号： C21B11/00
摘要： PURPOSE:To efficiently transmit the heat generated by secondary combustion to a metal bath by blowing gaseous O2 to a furnace to burn a carbonaceous material and to reduce ore and splashing the formed metal as splashes to a secondary combustion zone by a blowing gas. CONSTITUTION:The carbonaceous material and ore are charged into the melt reduction furnace 1 and the gaseous O2 is blown from bottom blowing tuyeres 6, etc., to burn the above-mentioned carbonaceous material. The above-mentioned ore is thereby reduced to form the metal bath 2 and slag 3. The gaseous CO formed by the combustion is secondarily burned by the gaseous O2 blown from tuyeres 4 and the metal bath 2 is heated by the generated heat. The gaseous O2 is blown from tuyeres 5 provided under the bath surface of the metal bath 2 to splash the metal of the metal bath 2 as splashes to the secondary combustion zone in the above-mentioned operation. As a result, the splashes efficiently absorb the heat generated by the secondary combustion and recover the same into the metal bath 2.

64. 发明专利

JPS62278216A METHOD FOR PROTECTING REFRACTORY OF NOZZLE FOR BLOWING GAS INTO CONVERTER 失效
公开(公告)号：JPS62278216A
公开(公告)日：1987-12-03
申请号：JP12021686
申请日：1986-05-27
申请人： NIPPON KOKAN KK
发明人： UCHIDA SHIGETAKA , FUKUMI JUNICHI , TANABE HARUYOSHI , KAWAKAMI MASAHIRO , TAKI CHIHIRO
IPC分类号： C21C5/48 , C21C5/44
摘要： PURPOSE:To prevent the erosion of a bottom blowing nozzle by forming porous solidified iron (mushroom) on the operation surface of the refractory of the nozzle in a converter with a gas blown from the nozzle and a solid coolant. CONSTITUTION:A small amount of molten steel is left in a converter after tapping and the molten steel is solidified around a bottom blowing nozzle by cooling with a gas blown from the nozzle or a solid coolant such as crude dolomite or quick lime to efficiently form a mushroom. This mushroom is easily formed and the extent of erosion of the refractory can be remarkably reduced.

65. 发明专利

JPS62274019A PRODUCTION OF HIGH-CHROMINUM ALLOY 失效
公开(公告)号：JPS62274019A
公开(公告)日：1987-11-28
申请号：JP11489386
申请日：1986-05-21
申请人： NIPPON KOKAN KK
发明人： USUI TSUTOMU , TANABE HARUYOSHI , FUKUMI JUNICHI , KAWAKAMI MASAHIRO , YAMADA KENZO
IPC分类号： C21C7/00
摘要： PURPOSE:To improve reduction efficiency and to decrease the consumption of a carbonaceous material by blowing Cr ore and the carbonaceous material together gas from side blowing tuyeres into the slag bath in a furnace body of a converter type at the time of specifying an OD ratio and subjecting the Cr ore, etc., to melt reduction in said furnace body. CONSTITUTION:A molten iron 2 is preliminarily put into the furnace body 1, and the Cr ore, charbonaceous material and flux are supplied from a hopper 3 into the furnace body; at the same time, oxygen is blown from a top blowing lance 4 into the furnace body and oxygen is blown from tuyeres 6 for secondary combustion therein to attain iota0.4 OD ratio. Then, the carbonaceous material is subjected to primary combustion by the oxygen from the lance 4 and the gaseous CO generated by such combustion is subjected to the secondary combustion by the oxygen from the tuyeres 6. The slag bath 5 is powerfully stirred when the Cr ore and carbonaceous material are blown together with the oxygen, air or gaseous nitrogen into the slag bath 5 from the side blowing tuyeres 7. A large quantity of heat generated by the primary and secondary combustion is thereby efficiently transferred to the slag bath 5. The reaction contact area of the Cr ore and carbonaceous material in the slag bath 5 is increased and the Cr ore is efficiently reduced.

66. 发明专利

JPS6293307A METHOD FOR CONTROLLING EXHAUST GAS FROM CONVERTER 失效
公开(公告)号：JPS6293307A
公开(公告)日：1987-04-28
申请号：JP23345485
申请日：1985-10-21
申请人： NIPPON KOKAN KK
发明人： KOTANINO NORIYUKI , SHIRATANI YUSUKE , ISHIKAWA MASARU , FUKUMI JUNICHI , KAWAKAMI MASAHIRO
IPC分类号： C21C5/38 , C21C5/32
摘要： PURPOSE:To keep the internal pressure of a converter constant and to obtain a low N2 steel by blowing converter gas, CO2, CO, Ar or other gas into the converter so as to keep the flow rate of exhaust gas constant. CONSTITUTION:In the last stage of refining by blowing in a converter, the amount of exhaust gas generated varies. At this times, a reducing gas such as converter gas (LDG) or CO, or an inert gas such as CO2 or Ar is blown into the converter so as to keep the flow rate of exhaust gas from the converter constant. As a result, the internal pressure of the converter is kept constant without considerably regulating an exhaust gas damper in an exhaust gas duct. The combustion of recovered exhaust gas with air sucked can be prevented, so the calorie of the recovered exhaust gas can be increased.

67. 发明专利

JPS6256513A METHOD FOR CONTROLLING END POINT OF CONVERTER BLOWING 失效
公开(公告)号：JPS6256513A
公开(公告)日：1987-03-12
申请号：JP19530985
申请日：1985-09-04
申请人： NIPPON KOKAN KK
发明人： KAWAMURA NOBUO , FUKUDA MASACHIKA , TANABE HARUYOSHI , NAKAMURA HIROMI , FUKUMI JUNICHI , KAWAKAMI MASAHIRO
IPC分类号： C21C5/30
摘要： PURPOSE:To improve the control accuracy of dynamic control by surely executing a sub-lance measurement at the optimum point of the time during blowing. CONSTITUTION:The transition of the concn. of C [C] of a molten steel is estimated by a predicting arithmetic unit 11 from the metallurgical reaction in a converter 1. The decarburization transition point CT at the blowing is determined by an arithmetic unit 13 in accordance with the flow rate Q of a bottom blowing gas in said blowing from the preliminarily obtd. relation between the oxygen blowing rate Q from a bottom blowing device 9 and the decarburization transition point or the preliminarily obtd. transition point in the case of not blowing the gaseous oxygen from the converter bottom. On the other hand, the predicted transition of the concn. of C of the molten steel is inputted to the unit 13 from the unit 11. The unit 13 lowers the sub-lance 6 to sample the molten steel by determining the point of the time when the momentarily decreasing concon. of C of the molten steel attains the decarburization transition point in accordance with such data. The data of the sampling is used for the dynamic control of the end point of blowing, by which the hit rate of the temp. and component compsn. of the molten steel at the end point is increased.

68. 发明专利

JPS627814A SLAG COATING METHOD 失效
公开(公告)号：JPS627814A
公开(公告)日：1987-01-14
申请号：JP14578385
申请日：1985-07-04
申请人： NIPPON KOKAN KK
发明人： UCHIDA SHIGETAKA , TANABE HARUYOSHI , FUKUMI JUNICHI , KAWAKAMI MASAHIRO
IPC分类号： C21C5/44
摘要： PURPOSE:To coat a converter inner wall with slag in a short time after tapping, by tapping molten steel after a steel making refining by the converter, throwing a reducing agent to a residual molten slag to lower its temp. by endothermic reaction in reduction of iron oxide in the molten slag and increasing the viscosity. CONSTITUTION:The refined molten steel in converter operation is tapped, and the excess molten slag is discharged while leaving a prescribed quantity of molten slag in the furnace. About 1/3 of quick lime, dolomite, etc. being flux to be used in next time charging is thrown to the remaining slag, and a suitable quantity of cokes being the reducing agent is added. After lowering the temp. of molten slag and increasing its viscosity by the reduction endothermic reaction of iron oxide in the molten slag due to the addition of flux being cooling material and cokes, the converter is turned and moved slightly. Thereby, the slag for protecting inner wall of the converter is coated in a short time after tapping.

69. 发明专利

JPS61217516A DETECTION OF SLAG LEVEL IN CONVERTER 失效
公开(公告)号：JPS61217516A
公开(公告)日：1986-09-27
申请号：JP5826685
申请日：1985-03-25
申请人： NIPPON KOKAN KK
发明人： HIRANO MINORU , FUKUMI JUNICHI , TANABE HARUYOSHI , KAWAKAMI MASAHIRO , NAKAMURA HIROMI
IPC分类号： C21C5/28 , C21C5/46
摘要： PURPOSE:To surely detect the slag level in a converter by inserting a lance embedded with many temp. sensors at suitable intervals in the longitudinal direction into the converter and measuring continuously the temp. in the converter by the temp. sensors. CONSTITUTION:The many thermocouples 3a-3n are embedded at suitable intervals into the water cooling lance 2 to measure the temp. in the converter 1 during blowing in the stage of executing blowing by charging a molten metal 4 and slag 5 into the converter 1 and inserting the lance 2 therein. The top surface 5a of the slag 5 exists near the position where the temp. in the converter measured by the thermocouples 3a-3n exhibits the max. value and the slag height is easily detected from the position of the thermocouple. Slopping is thereby predicted and prevented or the improvement of a yield, the production of a low-N steel, etc., are made possible by controlling the rate of oxygen feed, the height of the lance 2, etc.

70. 发明专利

JPS61210114A DETECTION OF SLAG LEVEL IN CONVERTER 失效
公开(公告)号：JPS61210114A
公开(公告)日：1986-09-18
申请号：JP5052685
申请日：1985-03-15
申请人： NIPPON KOKAN KK
发明人： HIRANO MINORU , NAKAMURA HIROMI , FUKUMI JUNICHI
IPC分类号： C21C5/46
摘要： PURPOSE:To prevent slopping by inserting a small tube consisting of a refractory material into a converter, ejecting an inert gas into the converter through the small tube and measuring continuously the back pressure thereof. CONSTITUTION:The small tube 3 consisting of the refractory material is inserted into a tap hole 2 of the converter 1 and the inert gas is ejected through the tube 3 into the converter during the converter operation. The back pressure of the tube 3 is increased by the resistance of slag 9 when the slag rises and arrives at the aperture level of the tube 3. The back pressure is continuously measured by a pressure gage 4 and an alarm is emitted by an alarm device 6 when the back pressure exceeds the threshold value. The generation of slopping is thus predicted.

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