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1. 发明专利

JPH09227927A METHOD FOR PROTECTING LINING REFRACTORY IN VACUUM DEGASSING VESSEL 失效
公开(公告)号：JPH09227927A
公开(公告)日：1997-09-02
申请号：JP3489596
申请日：1996-02-22
申请人： NIPPON KOKAN KK
发明人： SAKURAI EIJI , YOSHIDA MASANORI , KAWASHIMA KAZUTOSHI , TAKASUGI HIDETO , KAMEMIZU AKIRA , TANO MANABU , TAKAOKA TOSHIO , MATSUNO EIJU , MURAI TAKESHI
IPC分类号： C21C7/10
摘要： PROBLEM TO BE SOLVED: To provide a protecting method for lining refractory of a vacuum degassing vessel in an RH degassing equipment. SOLUTION: In the RH degassing equipment, the circulating flow of molten metal is substantially stopped under condition of sucking up the molten metal into the vacuum vessel 1 and refractory protecting agent 6 is added on the molten metal surface in the vacuum vessel 1. Further, the vacuum degree in the vessel is varied and the molten metal surface is gradually lowered and the refractory protecting agent 6 floated up on the molten metal surface is stuck to the surface of the lining refractory of the vacuum vessel 1 to protect the lining refractory with the stuck refractory protecting agent 6.

2. 发明专利

JPH0649524A PRODUCTION OF HIGHLY CLEAN STEEL 失效
公开(公告)号：JPH0649524A
公开(公告)日：1994-02-22
申请号：JP20389992
申请日：1992-07-30
申请人： NIPPON KOKAN KK
发明人： KAMEMIZU AKIRA , INOUE AKIHIKO , KODAIRA SATOSHI , KOMATSU YOSHIMI
IPC分类号： C21C7/00 , C21C7/076
摘要： PURPOSE:To improve the Al2O3 absorbability of ladle slag by decreasing (T, Fe) in the slag of the molten steel tapped from a converter and to suppress the outflow of the ladle slag into a continuous casting tundish. CONSTITUTION:The molten steel is melted in the converter. This molten steel is tapped into the ladle and the slag floating on the molten steel received into the ladle is deoxidized. The molten steel is then subjected to a vacuum degassing treatment. The molten steel is tapped in an undeoxidized state and lime is added to the molten steel under tapping at the time of melting the molten steel in the converter. Metal Al is added as a slag deoxidizing agent to the molten steel to adjust the ratio of the (CaO)/(Al2O3) in the slag to 1.3 to 1.5 right after the addition of the Al and to 0.6 to 0.8 after the vacuum degassing, by which the ladle slag after the vacuum degassing is solidified in the deoxidizing stage of the slag.

3. 发明专利

JPH08311530A DEGASSING REFINING METHOD 失效
公开(公告)号：JPH08311530A
公开(公告)日：1996-11-26
申请号：JP11737295
申请日：1995-05-16
申请人： NIPPON KOKAN KK
发明人： KAMEMIZU AKIRA , FURUNO YOSHIKATSU , FUKUMI JUNICHI , TOYODA KOJI
IPC分类号： C21C7/10
摘要： PURPOSE: To prevent the diffusion of outer air into a vessel and the absorption of nitrogen into molten steel by passing inert gas in a gas passage during RH degassing treatment. CONSTITUTION: The gas passages 43, 44, 45 are formed so as to surround molten steel flowing passages 24a, 25a of a circulating tube 23 in a circulating tube refractories 32, 33 at the upper part from a connecting part of the lower vessel 11 of an RH degassing apparatus 10 and immersion tubes 24, 25. During degassing treatment, the inert gas is passed in the flow rate range of 5-50Nm /hr into the gas passages 43, 45 only in the downtake side refractory. The inner parts of the circulating tube refractories 32, 33 are made in the inert gas atmosphere and the molten steel 5 passed through the molten steel flowing passages 24a, 25a of the circulating tube 23 is shut off from the outer air. Further, at the time of blowing gaseous argon into the molten steel passage 24a from a gas blowing pipe 28, the molten steel 5 is sucked up into the lower vessel 11 from a ladle and thereafter, the molten steel is descended in the other immersion tube 25 and returned back into the ladle from the lower vessel 11.

4. 发明专利

JPH06200311A METHOD FOR DEPHOSPHORIZING MOLTEN IRON 失效
公开(公告)号：JPH06200311A
公开(公告)日：1994-07-19
申请号：JP20793
申请日：1993-01-05
申请人： NIPPON KOKAN KK
发明人： INOUE AKIHIKO , KOMATSU YOSHIMI , KAWAKAMI MASAHIRO , KAMEMIZU AKIRA , KOMATANI MASANORI
IPC分类号： C21C1/02
摘要： PURPOSE:To efficiently and inexpensibly execute the dephosphorization of molten iron by using a converter or a refining furnace provided with a slag separating device. CONSTITUTION:In the converter or the refining vessel 1 having a slag separating device, the prescribed molten iron raw material and refining material are charged and slag of the wt. corresponding to >=1% molten iron treating wt. in the slag 5 generated after the dephosphorize-refining is remained in the converter, etc., and the remaining slag is discharged, and thereafter, the molten iron and the refining material are charged to repeatedly execute the dephosphorizing treatment. Further, when the slag generated at the preceding dephosphorize-refining has the dephosphorizing performance, after executing the dephosphorizing treatment two or more times while discharging the preceding slag to the outside of the refining furnace, the generated slag is partially remained to successively execute the dephosphorizing treatment.

5. 发明专利

JPH0633128A METHOD FOR AUTOMATICALLY STOPPING STEEL-TAPPING IN CONVERTER 失效
公开(公告)号：JPH0633128A
公开(公告)日：1994-02-08
申请号：JP19411892
申请日：1992-07-21
申请人： NIPPON KOKAN KK
发明人： KOMATANI MASANORI , KAMEMIZU AKIRA , KOMATSU YOSHIMI
IPC分类号： C21C5/46
摘要： PURPOSE:To automatically stop steel-tapping from a converter by detecting molten steel height in a ladle and, on the other hand, detecting flow-out of slag in the converter from a steel-tapping hole at the time of tapping the steel in the converter. CONSTITUTION:At the time of tapping the molten steel from the converter, the molten steel surface height in the ladle (a first molten steel surface height in the ladle) to detect whether the slag is flowed out or not from the steel-tapping hole based on raw material charged quantity and the molten steel surface height (a second molten steel surface height in the ladle) to stop the steel-tapping, are calculated, respectively. While detecting the molten steel surface height in the ladle and whether the slag is flowed out or not from the steel-tapping hole, when the molten steel surface height in the ladle becomes to the first molten steel surface height or higher in the ladle and the slag is detected or when the molten steel surface height becomes the second molten steel surface height or higher, the steel-tapping is stopped. By this method, at the time of tapping the molten steel from the converter, the flow-out of the slag into the ladle and the overflow of the molten steel, etc., from the ladle can automatically be prevented, thus contributing to the automation of steelmaking operation.

6. 发明专利

JPH0559419A METHOD FOR DEPHOSPHORIZING MOLTEN IRON 失效
公开(公告)号：JPH0559419A
公开(公告)日：1993-03-09
申请号：JP24829491
申请日：1991-09-02
申请人： NIPPON KOKAN KK
发明人： INOUE AKIHIKO , KAMEMIZU AKIRA
IPC分类号： C21C1/02
摘要： PURPOSE:To provide a dephosphorizing method for molten iron executing efficient dephosphorization with the necessary lower limit of adding quantity of soda ash. CONSTITUTION:At the time of executing the dephosphorizing treatment by adding flux composed of gaseous oxygen, solid oxygen source, lime and soda ash, and slag melting accelerator into the molten iron beforehand reducing Si content to =0.35Nm per 1kg of the soda ash. By this method, the dephosphorization is efficiently executed with the necessary lower limit of the adding quantity of the soda ash.

7. 发明专利

JP2000119732A MELTING METHOD FOR HIGH CLEANLINESS EXTRA-LOW CARBON STEEL 失效
公开(公告)号：JP2000119732A
公开(公告)日：2000-04-25
申请号：JP28487698
申请日：1998-10-07
申请人： NIPPON KOKAN KK
发明人： KOMATSU YOSHIMI , NAKAJIMA HIROHISA , TANAKA HIDESHIGE , KAMEMIZU AKIRA
IPC分类号： C21C7/00 , C21C7/068 , C21C7/076 , C21C7/10
摘要： PROBLEM TO BE SOLVED: To reduce particularly alumina base non-metallic inclusion by satisfying each specific condition before and after Al deoxidizing treatment of molten steel in the following process with respect to slag after reforming in a third process. SOLUTION: In the third process, after completing the tapping of molten steel, a reducing agent is added into new slag formed by consisting of the slag inevitably flowing into a ladle during tapping the molten steel and lime charged into the ladle to reform the new slag. In the following process, a vacuum decarburizing treatment and the deoxidizing treatment are applied to the molten steel in the ladle covering the upper surface with the reformed slag by using a vacuum degassing apparatus. At this time, the slag before deoxidizing treatment, is regulated to in the range of 3.0-7.0 basicity shown with CaO/SiO2 and in the range of 30-45% Al2O3 content shown by Al2O3/(Al2O3+SiO2+ CaO)}×100(%) and the slag after deoxidizing treatment, is regulated to

8. 发明专利

JP2985643B2 失效
公开(公告)号：JP2985643B2
公开(公告)日：1999-12-06
申请号：JP3064394
申请日：1994-02-28
申请人： NIPPON KOKAN KK
发明人： MURAI TAKESHI , KAMEMIZU AKIRA , TERAOKA TAKUJI
IPC分类号： C21C7/10 , C21C7/00 , C21C7/068

9. 发明专利

JPH083627A DUST COLLECTING EQUIPMENT OF VACUUM DEGASSING EQUIPMENT 失效
公开(公告)号：JPH083627A
公开(公告)日：1996-01-09
申请号：JP14038994
申请日：1994-06-22
申请人： NIPPON KOKAN KK , MATSUBOO KK
发明人： HIDE KANJI , KAMEMIZU AKIRA , KISHIDA EIMEI , INOUE YASUHIDE
IPC分类号： C21C7/10 , F27D17/00
摘要： PURPOSE:To obtain high dust collection efficiency and to reduce the repair cost of a vacuum discharge system by providing a waste gas line with a waste gas cooler, bag filter dust collectors and devices for back washing this bag filter. CONSTITUTION:A gas tank 1 as a cooler for cooling waste gases by adiabatic expansion of a compressed gas (inert gas) is connected to the waste gas line of a vacuum degassing treatment device. A gas cooler 2 for indirect cooling by a cooling medium is installed. A settling chamber 3 is disposed behind this gas cooler 2 to capture coarse-grained dust, metals, etc. Two systems of the switchable bag filter dust collectors 4 are disposed behind this settling chamber 3 to capture dive dusts in the waste gases. Pulsating gas jet back washing mechanisms are installed to back wash the bag filter cloth. As a result, the high dust collection efficiency is obtd., the equipment is capable of easily meeting the regulations for waste gases and the repair cost is reduced.

10. 发明专利

JPH06192716A PRODUCTION OF LOW PHOSPHORUS MOLTEN IRON UTILIZING SCRAP MELTING 失效
公开(公告)号：JPH06192716A
公开(公告)日：1994-07-12
申请号：JP34604992
申请日：1992-12-25
申请人： NIPPON KOKAN KK
发明人： INOUE AKIHIKO , KOMATSU YOSHIMI , KAWAKAMI MASAHIRO , KAMEMIZU AKIRA , KOMATANI MASANORI
IPC分类号： C21C1/02 , C21C5/28 , C21C5/52
摘要： PURPOSE:To efficiently produce a low phosphorus molten iron while utilizing melting of large quantity of scrap by charging the prescribed quantity of molten iron and a large quantity of scrap into a converter, executing dephosphorize-refining, leaving unmolten scrap and tapping steel. CONSTITUTION:Into converter or the converter-type refining vessel, the prescribed molten iron and quantity of more than the wt. possible to be melted in a single dephosphorizing treatment, are charged. Successively, the prescribed quantities of refining agent and oxygen are charged into this refining vessel to execute the deposphorize- refining. Thereafter, the refining vessel is tilted, and while leaving the unmolten scrap in the vessel, the molten low phosphorus iron after refining is discharged into a carrying vessel. Successively, in the condition of leaving the unmolten scrap, the prescribed molten iron is charged into the refining vessel to execute dephosphorize-refining. At this time, in the dephosphorize-refining after the second time, the melting of the remained scrap is promoted in the sufficiently preheated condition. By this method, the low phosphorus molten iron is obtd. while utilizing melting of a large quantity of scrap without generating extension of the refining time, scrap working process, oxidizing loss of C in the molten iron, etc.

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