专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明专利

JPH05117046A BAKING REPARATIVE MATERIAL AND METHOD FOR BAKING AND REPAIRING FURNACE USING BAKING REPARATIVE MATERIAL 失效
公开(公告)号：JPH05117046A
公开(公告)日：1993-05-14
申请号：JP30387891
申请日：1991-10-24
申请人： NIPPON KOKAN KK , SHINAGAWA REFRACTORIES CO
发明人： KATO HISAKI , FUKUMI JUNICHI , NISHI MASAAKI , YAMAMURA TAKASHI , NAKAMURA RYOSUKE , TAKESHITA YASUO
IPC分类号： B22D41/02 , C04B35/66 , F27D1/16
摘要： PURPOSE:To provide a baking reparative material which is a baking reparative material capable of forming repaired bodies of a dense structure without reducing metallic oxides in an inner lining refractory for a furnace or reducing iron oxides in slag at high temperatures, causing deterioration in bonding strength and deteriorating refractoriness even at high temperatures. CONSTITUTION:A baking reparative material is composed of a refractory material, a phenolic resin and a sintering agent and characterized by adding the phenolic resin so as to provide 0.5-2.5% amount of the residual carbon when kept at 1000 deg.C under nonoxidizing conditions for 3hr to the refractory material and further adding a mixture composed of metallic silicon powder and metallic aluminum powder at a ratio of both within the range of (1:3) to (3:1) as the sintering agent thereto.

2. 发明专利

JPH0941027A PRODUCTION OF HIGHLY CLEANED STEEL 失效
公开(公告)号：JPH0941027A
公开(公告)日：1997-02-10
申请号：JP21680895
申请日：1995-08-02
申请人： NIPPON KOKAN KK
发明人： SAKURAI EIJI , TAKASUGI HIDETO , TANO MANABU , FUKUMI JUNICHI , FURUNO YOSHIKATSU , MATSUNO EIJU , YAMAGUCHI RYUJI , MURAI TAKESHI
IPC分类号： C21C7/04 , C21C7/10
摘要： PROBLEM TO BE SOLVED: To promote the reduction of oxide contained in a slag and to obtain a highly cleaned steel by adding reducing agent and circulating the molten steel while blowing inert gas into an immersion tube for sucking up, at the time of executing molten steel treatment by using an RH type vacuum degassing refining apparatus. SOLUTION: Firsty, a prescribed quantity of deoxidizing agent 5 of Al, etc., is added into the slag 4 floating on the surface of the molten steel 3 tapped into a ladle 2 from a converter 1. Successively, at the time of executing the molten steel treatment by using the RH type vacuum degassing refining apparatus 6, the inert gas having >=11.0Nm /min.m of cross sectional area of the immersion tube 8 is blown into the molten steel 3 sucked up through the immersion tube 8 for sucking up the molten steel from an introducing pipe 10 to circulate the molten steel. By this operation, the molten steel surface in the ladle 2 is shaken and low grade oxide of T.Fe, MnO, etc., in the slag 4 are sufficiently reduced by Al. Therefore, the reducing reaction is promoted without unnecessarily suspending the slag in the molten steel 3, and the highly cleaned steel can be obtd.

3. 发明专利

JPH07173521A RH DEGASSING APPARATUS 失效
公开(公告)号：JPH07173521A
公开(公告)日：1995-07-11
申请号：JP32163393
申请日：1993-12-21
申请人： NIPPON KOKAN KK , HARIMA CERAMIC CO LTD
发明人： NAKANISHI HIROAKI , FUKUMI JUNICHI , FURUNO YOSHIKATSU , NISHI MASAAKI , SAKURAI EIJI , NISHIDA MICHIO
IPC分类号： C21C7/10
摘要： PURPOSE:To improve the damaging balance of bedded refractory and prolong the service life of a degassing vessel by piling up the height of the refractory lining on the bedding center part between two circulating tubes and at the neiborhood thereof in a vacuum degassing vessel higher than the height of the surrounding part. CONSTITUTION:The height level 15 of the refractory lining 25 on the bedding center part 24 between the mutual circulating tubes, by which the molten steel 12 is sucked up into the vessel 22 from a molten steel container 11 through one side of the circulating tube 3 and degassed and the molten steel in the vessel is returned back from the other side of the circulating tube 3, and at the neighborhood thereof, is higher than the height level 14 of the refractory lining of the bedding surrounding part 27 by 30-130mm. Further, the bedding center part piling up the refractory lining is the range corresponding to 50-250% of the inner diameter of the tube in the direction crossed at the right angle to the arrangement of the circulating tubes as the intermediate point of the mutual circulating tubes is the center.

4. 发明专利

JPH0559422A METHOD FOR CONTROLLING SECONDARY COMBUSTION IN MELTING AND REFINING FURNACE 失效
公开(公告)号：JPH0559422A
公开(公告)日：1993-03-09
申请号：JP21873291
申请日：1991-08-29
申请人： NIPPON KOKAN KK
发明人： TAKI CHIHIRO , UCHINO TOMOHIKO , FUKUMI JUNICHI
IPC分类号： C21C5/30
摘要： PURPOSE:To provide a control method for the secondary combustion in a melting and refining furnace by using a water cooled lance to execute the oxygen blowing refining and burning the generated combustible gas. CONSTITUTION:In the control method for secondary combustion in the melting and refining furnace 2 by using the water cooled lance of execute the top blowing refining of oxygen and burning the generated combustible gas (CO), temp. difference at between the inlet side 3 and the outlet side 4 of cooling water in the water cooled lance, is detected and the height of the water cooled lance 1 is adjusted so as to become the constant temp. difference. In the figure No.17 shows a lance lifting guide. With so simple operation as to continuously detect the temp. difference at between the inlet and the outlet of cooling water in the water cooled lance during blowing, as abnormal condition of the secondary combustion is rapidly confirmed and this is controlled so as to become the normal condition, the service life of refractory in the furnace selected so as to bear to the normal condition of the secondary combustion, can be extended.

5. 发明专利

JPH0533030A METHOD FOR REPAIRING REFRACTORY IN SMELTING REDUCTION FURNACE 失效
公开(公告)号：JPH0533030A
公开(公告)日：1993-02-09
申请号：JP18277891
申请日：1991-07-24
申请人： NIPPON KOKAN KK
发明人： UCHINO TOMOHIKO , TAKI CHIHIRO , FUKUMI JUNICHI
IPC分类号： C21C5/44
摘要： PURPOSE:To prevent peeling of coated slag for long time by remaining the slag enriched to MgO in the furnace after steel-tapping by executing smelting reduction to Ni oxide ore with carbonaceous material and injecting inert gas to this slag. CONSTITUTION:In a smelting reduction furnace 1 after steel-tapping by executing the smelting reduction to the Ni oxide ore with the carbonaceous material, a part or all of the slag enriched to MgO is remained. The inert gas 4 is injected to this slag 2 from a lance 3. The slag 2 is stuck to refractory 5 in the furnace as splash and cooled. Then, on upper surface of the refractory 5, the coating layer of smooth cupped slag 2 at the surface, is formed. At the time of executing the smelting reduction by charging the Ni oxide ore into the slag coated smelting reduction furnace 1, the slag coated layer except a part of furnace bottom is left and it is proved that there is sufficient collecting effect.

6. 发明专利

JPH04289111A EXHAUST GAS TREATING EQUIPMENT FOR METALLURGICAL FURNACE 失效
公开(公告)号：JPH04289111A
公开(公告)日：1992-10-14
申请号：JP7577391
申请日：1991-03-15
申请人： NIPPON KOKAN KK , KAWASAKI HEAVY IND LTD
发明人： KANETANI GENJI , FUKUMI JUNICHI , TAKI CHIHIRO , SUGA NORIAKI , AZUMA HIDEKI , FUJIKURA NOBUYUKI
IPC分类号： C21C5/40
摘要： PURPOSE:To provide the equipment in which stable dust removing efficiency is obtd. even in the case flow rate of exhaust gas discharged from a cooler in an exhaust gas hood varies due to large variation in gas quantity generated in a metallugical furnace of a converter, etc., during blowing and the stable operation can be executed in low pressure loss without any trouble of clogging even in the case dust concn. in the waste gas increases. CONSTITUTION:A horizontal type cyclone 3 which connects an inlet duct 6 in tangential direction of a cylindrical body at one end part of axial direction in the cylindrical body forming circular chamber 4 extended to side direction of round shape, an outlet duct 7 at the other end part of axial direction and a hollow device 8 having tapered shape downward at lower part of the cylindrical body, is set at downstream side of the cooler in the exhaust gas hood as the dust removing apparatus.

7. 发明专利

JPH03134113A RH DEGASSING VESSEL 失效
公开(公告)号：JPH03134113A
公开(公告)日：1991-06-07
申请号：JP26966789
申请日：1989-10-17
申请人： NIPPON KOKAN KK
发明人： FURUNO YOSHIKATSU , FUKUMI JUNICHI , USUI TSUTOMU , INOUE SHIGERU , NAKANISHI HIROAKI , NAKAGAWA TOSHIAKI
IPC分类号： C21C7/10
摘要： PURPOSE:To prevent floating-up of bricks at center of a lower vessel and to prolong the service life of vessel by applying a wedge in the bricks lined interbetween one pair of molten metal passages in the single tube communicated with submerged tubes and fixing the bricks to the other member. CONSTITUTION:This RH degassing vessel 10 is formed with an upper vessel 11 communicated with degassing passage, the lower vessel 20 connected to this and the submerged tube 30 connected to one pair of the molten metal passages 32 in the single tube part 24, etc. The wedge 43 is applied in the lined bricks 27, 40, 41 provided interbetween one pair of the molten metal passages 32 in the above single tube part 24. Further, this lined bricks 27, 40, 41 are fixed to the other member.

8. 发明专利

JPH03134112A RH DEGASSING VESSEL 失效
公开(公告)号：JPH03134112A
公开(公告)日：1991-06-07
申请号：JP26966689
申请日：1989-10-17
申请人： NIPPON KOKAN KK
发明人： FURUNO YOSHIKATSU , FUKUMI JUNICHI , USUI TSUTOMU , INOUE SHIGERU , NAKANISHI HIROAKI , NAKAGAWA TOSHIAKI
IPC分类号： C21C7/10
摘要： PURPOSE:To finish repair and exchange of a lower vessel in a short time by arranging single tube part connected to submerged tubes to the lower vessel body part and enabling separation with joints. CONSTITUTION:This RH degassing vessel 10 is formed with an upper vessel 11 communicated with a degassing passage, the lower vessel body part 21 connected to this and the single tube part 24 connected to the submerged tubes 30, etc. The above single tube part 24 is arranged to the above lower vessel body 21 and made as separatable with the joints 23, 25.

9. 发明专利

JPH03104813A PRODUCTION OF LOW NITROGEN STEEL 失效
公开(公告)号：JPH03104813A
公开(公告)日：1991-05-01
申请号：JP24051789
申请日：1989-09-19
申请人： NIPPON KOKAN KK
发明人： FURUNO YOSHIKATSU , ARAI MANABU , FUKUMI JUNICHI
IPC分类号： C21C7/00
摘要： PURPOSE:To rapidly produce a low nitrogen steel at a low cost by adding a deoxidizer to a molten steel after the conclusion of blowing in a converter, tapping the molten steel while protecting it by means of a CO2 gas, etc., and directly delivering the molten steel to continuous casting equipment. CONSTITUTION:Prescribed amounts of metallic Al are thrown and added into a molten steel after the conclusion of blowing in a converter to carry out the deoxidation of the molten steel. An atmosphere in the region through which the tapping stream of the above molten steel is allowed to pass is previously substituted by Ar gas, He gas, CO2 gas, CO gas, etc., and then, the molten steel is tapped while being protected by means of the substituted gas and is directly delivered to continuous casting equipment to undergo continuous casting. By this method, [N] picking up can be effectively prevented though the molten steel is oxidized, and the low nitrogen steel can be rapidly obtained at a low cost.

10. 发明专利

JPH0361318A METHOD FOR REFINING DEAD-SOFT CARBON STEEL 失效
公开(公告)号：JPH0361318A
公开(公告)日：1991-03-18
申请号：JP19270389
申请日：1989-07-27
申请人： NIPPON KOKAN KK
发明人： FURUNO YOSHIKATSU , FUKUMI JUNICHI , INOUE SHIGERU , USUI TSUTOMU
IPC分类号： C21C7/10
摘要： PURPOSE:To accelerate the reaction between [C] and [O] and to produce a dead-soft carbon steel by detecting the amount of CO generated in the latter stage in a refining period, blowing specific amounts of gas into a molten steel according to the detected value, and increasing the agitation of the molten metal due to the resulting bubbles at the time of subjecting a molten steel to decarburizing refining in an RH-type degassing refining apparatus. CONSTITUTION:A molten steel 3 in a ladle 2 is sucked into a vacuum tank in an RH-type vacuum degassing refining apparatus 10, and CO gas as a decarburization product due to the reaction between [C] and [O] is discharged in a bubble state from the molten steel 3, and the CO gas is discharged while agitating the molten steel. This reaction exhaust gas is evacuated by means of an evacuation duct 30, and the amount of CO generated is measured by means of a flowmeter 34 and an analyzer 35 for the exhaust gas. At the point of time when reduction in the amount of CO generated takes place as a result of reduction in [C] content in the latter stage in a refining period, a gas of Ar, etc., is blown from a gas supply source 37 through a blowing nozzle 46 into the molten steel. At this time, the sum of the amount of CO generated and the amount of Ar blown is regulated so that it is higher than the amount of CO exhaust gas generated in the former stage in the refining period and agitation power due to gas bubbles in the molten steel is increased so that it is similar to that in the former stage in the refining period, by which the reaction between [C] and [O] is accelerated. By this method, a dead-soft carbon steel of

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式