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1. 发明专利

JP2002363631A METHOD FOR DISCRIMINATING SLAG AT FIRING POINT, AND METHOD FOR DEPHOSPHORIZING MOLTEN IRON BASED ON THE METHOD 失效
公开(公告)号：JP2002363631A
公开(公告)日：2002-12-18
申请号：JP2001171836
申请日：2001-06-07
申请人： NIPPON KOKAN KK
发明人： KAWABATA RYO , SHIMIZU HIROSHI , TAKAOKA TOSHIO , KIKUCHI YOSHITERU , MURAI TAKESHI , NAKAI YOSHIE , MATSUNO EIJU , OSHIGE TAKAHIKO
IPC分类号： C21C5/46 , C21C1/02
摘要： PROBLEM TO BE SOLVED: To establish a method for discriminating whether slag exists or not in a firing point formed at a collision point when oxygen-containing gas is blown toward molten iron surface or molten steel surface and also discriminating a molten state of the slag. SOLUTION: When oxygen or mixed gas containing oxygen is blown toward the molten iron surface or the molten steel surface, the temperature of the firing point formed at the collision point, is measured, and the measured temperature at the firing point is compared with a solidus temperature and a liquidus temperature of the slag floated up on the molten iron surface or the molten steel surface, and a solidus temperature and a liquidus temperature of the molten iron and the molten steel, to discriminate whether or not the slag at the firing point exists and the molten state of the slag.

2. 发明专利

JP2000337776A METHOD FOR IMPROVING SECONDARY COMBUSTION RATE AND HEATING EFFICIENCY OF MELTING FURNACE, OR THE LIKE 失效
公开(公告)号：JP2000337776A
公开(公告)日：2000-12-08
申请号：JP14472499
申请日：1999-05-25
申请人： NIPPON KOKAN KK
发明人： KIKUCHI YOSHITERU , KAWABATA RYO , TAKAOKA TOSHIO , ISHII TOSHIO
IPC分类号： C22B1/20 , C21B11/00 , C21C5/30 , C21C5/52 , F27B3/22 , F27D17/00
摘要： PROBLEM TO BE SOLVED: To increase the secondary combustion rate and heating efficiency of a melting furnace, etc., without shortening the service lives of refractories, etc., and suppressing the flying out of slag, etc., by using a gas containing an oxygen gas more than a specific amount as a combustion supporting gas for secondary combustion. SOLUTION: The method for improving secondary combustion rate and heating efficiency of melting furnace, etc., uses a gas containing >=60% oxygen gas as a combustion supporting gas for secondary combustion. In order to heat the oxygen gas for secondary combustion to a high temperature, oxygen gas preheaters 5 are installed to the oxygen gas introducing sections of lances 2. Because of the preheaters 5, the oxygen gas can be heated to a temperature of about 1,100 deg.C and the temperature of the oxygen gas at the discharge ports of the lances 2 can be maintained at >=950 deg.C. In addition, the flow speeds of the oxygen gas discharged from nozzles are set at 100, 250, and 500 m/sec. Therefore, when the melting of a raw material is accelerated or the temperature in a melting furnace, such as the converter, electric furnace, etc., is raised at the time of melting the raw material in the furnace, the raw material can be melted by reducing the used amount of fuel or the combustion supporting gas without worsening the operability of the furnace nor damaging refractories by improving the heating efficiency of secondary compustion.

3. 发明专利

JP2000290716A METHOD FOR REFINING MOLTEN IRON 失效
公开(公告)号：JP2000290716A
公开(公告)日：2000-10-17
申请号：JP10092199
申请日：1999-04-08
申请人： NIPPON KOKAN KK
发明人： KIKUCHI YOSHITERU , TAKAOKA TOSHIO , KAWABATA RYO
IPC分类号： C21C1/02 , C21C1/04
摘要： PROBLEM TO BE SOLVED: To provide an environmentally sound molten iron refining method by which the consumption of ferro-manganese can be reduced in comparison with conventional methods and the resource and the energy are saved and the generated quantity of the slag, etc., can be reduced as much as possible. SOLUTION: In the refining method of molten iron from a blast furnace, where a molten iron pretreatment is executed and at least desiliconizing process, dephosphorizing process and decarburizing process are executed in this order, and in the desiliconizing treatment of the blast furnace molten iron in the desiliconizing process, at least a part of the total manganese source to be charged in the molten iron refining process, is charged and the manganese concn. in the molten iron is raised and also, the silicon concn. in the molten iron is controlled to

4. 发明专利

JPH09194958A METHOD FOR RESTRAINING WEARING OF MAGNESIA-BASE REFRACTORY 失效
公开(公告)号：JPH09194958A
公开(公告)日：1997-07-29
申请号：JP168196
申请日：1996-01-09
申请人： NIPPON KOKAN KK
发明人： MIYATA YASUTO , ISOO NORIO , KOMATANI MASANORI , TAKAOKA TOSHIO , INOUE AKIHIKO , WATANABE ATSUSHI
IPC分类号： C22B5/10 , C21C5/28 , C21C5/36 , C22B23/02 , C22B34/32
摘要： PROBLEM TO BE SOLVED: To provide a method for restraining the wear of a magnesia-base refractory lined in the inner surface of a smelting reduction furnace. SOLUTION: Molten iron is charged into a smelting reduction furnace lined with the magnesia-base refractory and metallic oxide is added together with carbonaceous material into the molten iron to execute smelting reduction of the molten metal. Then, Mg-containing material is added into the slag at the heat-raising period before adding metallic oxide, and magnesia content in the slag is made by 1-20wt.% excess than the saturated concn. in the produced slag.

5. 发明专利

JPH05340918A 失效
公开(公告)号：JPH05340918A
公开(公告)日：1993-12-24
申请号：JP16999592
申请日：1992-06-05
申请人： OSAKA OXYGEN IND , SASABE MINORU , NIPPON KOKAN KK
发明人： SASABE MINORU , FURUTA CHIKAYOSHI , NAGATSUKA TOSHIO , MIHASHI KENJI , TAKAOKA TOSHIO , KIKUCHI YOSHITERU , WASHIMI IKUHIRO
IPC分类号： G01N27/411
摘要： PURPOSE:To improve the measuring precision and the measurement success rate of a probe by mixing an iron oxide beforehand in a coating made of an oxide of a solute element to be measured or a composite oxide containing the oxide of the solute element to be measured. CONSTITUTION:A standard electrode 2 is disposed in contact with a solid electrolyte 1 and a standard electrode lead 3 is taken out, while a coating 4 is disposed on the opposite side of the electrolyte 1 to the standard electrode 2. When the coating 4 comes into contact with a molten metal 5, a layer 6 of local equilibrium being different from the metal 5 is formed. In the layer 6 of equilibrium, an oxide of a solute element to be measured and the solute element to be measured in the molten iron reach equilibrium, and the activity of oxygen in the layer 6 of equilibrium has a value corresponding to the activity of the solute element to be measured in the molten iron. When a difference in oxygen potential between the standard electrode 2 and the layer 6 of equilibrium is measured between the lead 3 and a measuring electrode 7, accordingly, a superpower corresponding to the activity of the solute element to be measured in the molten iron is obtained by a potentiometer 8.

6. 发明专利

JPH0551652B2 失效
公开(公告)号：JPH0551652B2
公开(公告)日：1993-08-03
申请号：JP27386386
申请日：1986-11-19
申请人： NIPPON KOKAN KK
发明人： MYANO HARUO , WATANABE ATSUSHI , PPONGO YUKIO , MORI HAJIME , KIKUCHI YOSHITERU , TAKAOKA TOSHIO
IPC分类号： C21C5/52 , C21C7/00 , C22C33/04

7. 发明专利

JPH0317236A MANUFACTURE OF FOAMED METAL 失效
公开(公告)号：JPH0317236A
公开(公告)日：1991-01-25
申请号：JP14941889
申请日：1989-06-14
申请人： NIPPON KOKAN KK
发明人： MATSUNO EIJU , KIKUCHI YOSHITERU , TAKAOKA TOSHIO , KAWAI YOSHIHIKO , NISHIOKA SHINICHI , USUI TSUTOMU
IPC分类号： C22C1/08
摘要： PURPOSE:To manufacture the formed metal in which fine gas bubbles are uniformly dispersed over the whole of the metal with high productivity by dissolving a soluble gas into a molten metal, rapidly reducing the pressure to generate gas bubbles and solidifying them in a formed state. CONSTITUTION:A soluble gas (such as an H2 gas and an N2 gas) is dissolved into a molten metal 1 by bubbling and is abundantly incorporated. Next, the pressure in the atmosphere is rapidly reduced and the dissolved gas components are generated as fine gas bubbles over the whole area of the molten metal 1. In the above state, e.g. cooled copper plates 2 are charged into the molten metal 1, which is rapidly solidified as formed and the solidified zone X is discharged as a foamed metal. Furthermore, for regulating the foaming rate to about >=0.8, the atmospheric pressure Pa in a furnace in the treatment at the time of reducing pressure to the equilibrium gas partial pressure Px of the soluble gas components dissolved in the molten metal 1 is controlled by the condition shown in the inequality of Px-Pa>=0.1 (atm). In this way, the foamed metal in a uniform foaming state can easily be manufactured.

8. 发明专利

JPH02285017A PRODUCTION OF MOLTEN STAINLESS STEEL 失效
公开(公告)号：JPH02285017A
公开(公告)日：1990-11-22
申请号：JP10889789
申请日：1989-04-27
申请人： NIPPON KOKAN KK
发明人： TAKAOKA TOSHIO
IPC分类号： C21B11/00 , C21B13/00
摘要： PURPOSE:To simplify equipment and to shorten treating time by carrying out, in the same furnace, a treatment consisting of blowing oxygen, etc., into a smelting furnace charged with Ni ore, carbon material, etc., charging Cr material into the resulting Ni-containing molten metal, and exerting smelting reduction. CONSTITUTION:Ni ore is charged together with carbon material and slagging agent into a smelting furnace and oxygen for decarburization is blown through a lance 21 into a molten metal 12, and simultaneously, oxygen for secondary combustion is blown into slag 11. Subsequently, CO gas, etc., are blown through a tuyere 24, and the value of (H2O+CO2)/(H2+H2O+CO+CO2) is held at >=0.3 to carry out reduction, by which an Ni-containing molten metal 12 is prepared. After dephosphorization and desulfurization are performed, Cr material is charged, by which an Ni- and Cr-containing molten pig iron is prepared. Then, oxygen for decarburization and gas for agitation are blown through the above lance 21 and the tuyere 24, respectively, by which decarburizing blowing is carried out.

9. 发明专利

JPH02274824A SMELTING REDUCTION METHOD FOR NI ORE 失效
公开(公告)号：JPH02274824A
公开(公告)日：1990-11-09
申请号：JP9815189
申请日：1989-04-18
申请人： NIPPON KOKAN KK
发明人： TAKAOKA TOSHIO
IPC分类号： C22B23/02
摘要： PURPOSE:To produce a Ni pig iron without developing slopping of molten slag by charging molten iron and carbonaceous material into a converter having oxygen top blowing lance and bottom blowing tuyere, and charging Ni ore after raising temp. of the molten iron with oxygen blowing and reducing NiO and FeO in the Ni ore. CONSTITUTION:The molten iron and the carbonaceous material are charged into the converter 10 provided with the oxygen top blowing lance 21 and the bottom blowing tuyeres 24, and by feeding the oxygen from the oxygen top blowing lance 21, the carbonaceous material is burnt to raise the temp. of the molten iron 11 at 1500 to 1750 deg.C. Successively, Ni oxide ore of silica-magnesia- Ni ore, etc., is charged and stirring gas is blown from the bottom blowing tuyeres 24 at the ratio of 0.3 to 3.0N, /min/ton of molten iron and also oxygen is blown from the oxygen lance 21 to reduce NiO and FeO in the ore. In this case, by adjusting Fe content in the molten slag to

10. 发明专利

JPH02270909A METHOD FOR CLEANING MOLTEN METAL 失效
公开(公告)号：JPH02270909A
公开(公告)日：1990-11-06
申请号：JP8977089
申请日：1989-04-11
申请人： NIPPON KOKAN KK
发明人： KAWAI YOSHIHIKO , KIKUCHI YOSHITERU , TAKAOKA TOSHIO , MATSUNO EIJU , ISHII TOSHIO , WATANABE ATSUSHI
IPC分类号： C22B9/05 , C21C7/072 , C21C7/10
摘要： PURPOSE:To improve removal efficiency of inclusion by adding two or more kinds of deoxidize elements, the deoxidizing strength of which are analogous, in the molten steel at the time of catching and removing the inclusion with gas bubbles by generating fine gas bubbles of dissolved gas under reducing the pressure after dissolving soluble gas into the molten metal of molten steel, etc., containing the inclusion. CONSTITUTION:As gas of O2, H2, etc., and Al2O3 and the other non-metallic inclusion are contained in the molten steel, the gas of N2, etc., is blown with bubbling into the molten steel and dissolved. The N2 gas dissolved, by reducing the pressure of surface atmosphere on the molten steel, is discharged as the fine gas bubbles, and when the gas bubbles rises in the molten steel, the gas of O2, H2, etc., contained in the molten steel is discharged at the same time, and also the non-metallic inclusion of Al2O3, etc., is caught, floated up and removed. When the molten steel is Al-killled steel, by adding the sub-deoxidizing elements of Ca, Mg, etc., the deoxidizing strength of which are analogous, the non-metallic inclusion is made coarsen by flocculating, and the effect of the floating-up and removal is further improved.

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