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1. 发明专利

JPS55110879A METHOD OF REPAIRING VACUUM CONTAINER 失效
公开(公告)号：JPS55110879A
公开(公告)日：1980-08-26
申请号：JP1865179
申请日：1979-02-20
申请人： KAWASAKI STEEL CO , KUROSAKI REFRACTORIES CO
发明人： KAZUTSUCHI FUMIO , KUBO SUEKI , MATSUNO TADAHIKO
IPC分类号： B05C3/02 , C21C7/10 , F27D1/16

2. 发明专利

JPS57200512A METHOD FOR CLOSING TUYERE 失效
公开(公告)号：JPS57200512A
公开(公告)日：1982-12-08
申请号：JP8443781
申请日：1981-06-03
申请人： KAWASAKI STEEL CO
发明人： TACHIBANA MASAHARU , HARITA AKIRA , MORISHITA HITOSHI , UMADA HAJIME , KAZUTSUCHI FUMIO
IPC分类号： C21C5/48
摘要： PURPOSE:To prevent the penetration of molten steel into a closed tuyere and to prevent the falling-off and the floating of a closing refractory material, in closing the tuyere of the damaged furnace bottom of a bottom blowing converter, the inside of the tuyere is filled with plural peaces of figurate refractory materials by using a small amount of an amorphous refractory material. CONSTITUTION:When a part of the furnace bottom tuyere of a bottom blowing converter is damaged, said tuyere is closed and the remaining tuyer is used to carry out refining. In closing the damaged tuyere, into the outer pipe 4 of the tuyere, plural pieces of figurate refractory materials 5a-5e having an outer diameter slightly smaller than the inner diameter of the tuyere outer pipe 4 are successively put as well as the peripheries of plural pieces of the figurate refractory materials are coated with an amorphous refractory material 6 such as magnesia mortar having a thermosetting resin as a binder compounded therein to close the inside of the tuyere outer pipe 4. Because the closing material is free from voids, the penetration of molten metal during refining or the falling-off and the floating of the closing refractory material are not generated and, therefore, molten metal is not leaked from this closed part.

3. 发明专利

JPS57192210A DEPHOSPHORIZATION OF LOW-SILICON PIG IRON 失效
公开(公告)号：JPS57192210A
公开(公告)日：1982-11-26
申请号：JP7472081
申请日：1981-05-18
申请人： KAWASAKI STEEL CO
发明人： MORISHITA HITOSHI , YAMADA SUMIO , KAZUTSUCHI FUMIO , TAKEUCHI HIDEJI
IPC分类号： C21C1/02 , C21C1/04
摘要： PURPOSE:To efficiently dephosphorize low-Si pig iron, by blowing and charging specified amounts of a powdery refining agent and a fluxing assistant to the low-Si pig iron in a bottom-blown converter, and holding the pig iron at a specified temperature by charge of a cooling agent. CONSTITUTION:Low-Si molten pig iron containing 0.15wt% or less of Si is poured into a bottom-blown converter, a powdery refining agent is injected by bottom-blowing refining gas as a carrier, a fluxing assistant is charged through the top opening of the vessel, and the temperature of the molten pig iron during blowing is held and controlled at 1,250-1,450 deg.C by charge of a cooling agent. In order to attain a dephosphorizing ratio of about 85% or more, 12kg or more of the powdery refining agent of calcium oxide powder is blown in, and 2kg or more of the fluxing assistant comprising at least one or fluorite, soda ash, cryolite, colemanite and red mud is charged. As the cooling agent is used at least one of iron ore, mill scale and scrap.

4. 发明专利

JPS57171615A REFINING METHOD FOR BOTTOM OF CONVERTER HAVING BOTTOM BLOWING TUYERE 失效
公开(公告)号：JPS57171615A
公开(公告)日：1982-10-22
申请号：JP5577881
申请日：1981-04-14
申请人： KAWASAKI STEEL CO
发明人： MORISHITA HITOSHI , UMADA HAJIME , KAZUTSUCHI FUMIO , TACHIBANA MASAHARU
IPC分类号： C21C5/48 , C21C5/44
摘要： PURPOSE:To refine the bottom of a bottom blown converter perfectly in a short time in refining the bottom part having bottom blowing tuyeres of said converter or the like by exchanging old tuyere pipes with new ones then flowing shapeless refractories into the furnace bottom and baking the same. CONSTITUTION:In the stage of refining a furnace bottom 11 having bottom blowing tuyere of a bottom or top blown converter, eroded old tuyere pipes are withdrawn from the outside and new tuyere pipes 13 are inserted. The top end parts of the pipes 13 are covered with a material which burns or melts at the temp. of molten metal, such as synthetic resins, Al, Cu or the like, after which a charging pipe 16 is inserted into the furnace and shapeless refractories 18 for refining are flowed through this pipe, whereby the furnace bottom 11 is refined. Next, a heater 19 such as burner lance is inserted to dry and bake the refractories 18. There is no need for the operator to enter the inside of the furnace and there is no exchanging of the entire part of the part 11; therefore, the furnace bottom including the tuyeres is refined safely in a short time.

5. 发明专利

JPS55110712A DESULFURIZING AGENT FOR BLOWINGGIN 失效
公开(公告)号：JPS55110712A
公开(公告)日：1980-08-26
申请号：JP1650979
申请日：1979-02-15
申请人： KAWASAKI STEEL CO , NIPPON SETSUKAI KOGYOSHO KK
发明人： HAIDA OSAMU , EMI TOSHIHIKO , YAMADA SUMIO , KAZUTSUCHI FUMIO , SONODA HIRAKI
IPC分类号： C01F11/02 , C21C1/02 , C21C7/064 , C22B9/10
摘要： PURPOSE:To obtain a quick lime desulfurizing agent which is excellent in desulfurizing performance due to its high reaction efficiency when blown into furnace and which contains fixed proportions of a fixed grained quick lime powder as the main component, a silicone oil surfactant, an alkaline earth metal carbonate, or hydroxide, and carbon. CONSTITUTION:A desulfurizing agent contains quick lime as the main component having a grains size (passing thru a sieve 50wt% or more), 0.015-1.0wt% a silicone oil surfactant, e.g., methyl hydrogen polysiloxane, 10-40wt% an alkaline earth metal carbonate or hydroxide, and 2-20wt% carbon. The carbonate or hydroxide used includes CaCO3 or Mg(OH)2, for example, and also carbon used includes charcoal, etc. The desulfurizing agent is cheap, can be used in the desulfurization of molten pig iron ladle or in torpedo car, and can cut down on the cost of desulfurization greatly.

6. 发明专利

JPS5785919A BLOWING METHOD FOR OXYGEN BOTTOM BLOWN CONVERTER 失效
公开(公告)号：JPS5785919A
公开(公告)日：1982-05-28
申请号：JP16132580
申请日：1980-11-18
申请人： KAWASAKI STEEL CO
发明人： YAMANAKA HIROMITSU , YAMADA SUMIO , KAZUTSUCHI FUMIO
IPC分类号： C21C5/34 , C21C5/35 , C21C5/46
摘要： PURPOSE:To prevent the breakage accident of a probe by interrupting the feeding of major part of blowing oxygen for a short time just prior to the insertion of a sensor lance and blowing a gas inert to blowing reaction in lieu of the oxygen to be blown thereby killing the blowing reaction, in charging the sensor lance. CONSTITUTION:Oxygen is supplied through a conduit 7 to an oxygen bottom blowing converter 1, and blowing is carried out. At the time of insertion of a sensor lance 11 into molten steel in order to obtain its information, the feeding of oxygen through the conduit 7 is interrupted temporarily at least with respect to the greater part by a valve 4. In lieu of this, one or >=2 kinds of gas such as Ar, N2, CO, CO2 inert to blowing reaction are blown through a conduit 9 so that the blowing reaction is killed during the sampling with the sensor lance 11.

7. 发明专利

JPS5713110A DEPHOSPHORIZATION TREATMENT OF MOLTEN IRON 失效
公开(公告)号：JPS5713110A
公开(公告)日：1982-01-23
申请号：JP8808180
申请日：1980-06-28
申请人： KAWASAKI STEEL CO
发明人： MORISHITA HITOSHI , UMADA HAJIME , KAZUTSUCHI FUMIO
IPC分类号： C21C1/02 , C21C1/04 , C21C5/35
摘要： PURPOSE:To effectively perform dephosphorization and to reduce the oxidation loss of Mn by specifying the basicity after the treatment of molten iron, the compounding of powdery refining agents, the amount of blowing oxygen, the temp. of treatment and the amount of bottom blowing gas. CONSTITUTION:Molten iron added with a coolant which suppresses temp. rise owing to blowing treatment is charged into a blowing vessel which is provided, at least, with a passage opening in the bottom wall and further permits adding of top blowing of blowing oxygen according to need. The molten iron temp. during blowing is kept at 1,250-1,450 deg.C. A powdery refining agent prepd. by compounding a flux consisting of at least one kind of fluorite, soda ash, cryolite, colemanite and red mud with calcium oxide which is a main component is blown together with blowing gas from the bottom part, the the slag basicity CaO/SiO2 after the treatment is controlled to 3-6. The amount of oxygen due to the charging of the coolant is set at 8-15Nm per ton of the molten iron, and the blowing gas is fed from the bottom part at a >=0.5Nm feed rate per minute per ton of the molten iron.

8. 发明专利

JPS563613A FEEDING METHOD OF BASICITYYCONTROL SAND INTO CONVERTER 失效
公开(公告)号：JPS563613A
公开(公告)日：1981-01-14
申请号：JP7725279
申请日：1979-06-19
申请人： KAWASAKI STEEL CO
发明人： MORISHITA HITOSHI , NAGAI JIYUN , KAZUTSUCHI FUMIO
IPC分类号： C21C5/34 , C21C5/36
摘要： PURPOSE:To control the basicity of molten slag with high accuracy by blowing the SiO2-contained ore such as silica sand into the molten metal through the bottom tuyeres at the bottom blowing converter operation thereby adding the same into the molten slag at a high yield. CONSTITUTION:Molten slag is made to have high basicity in order to let desulphurization and dephosphorization be accomplished in the bottom blowing converter. Since this high-basicity molten slag has a high CaO content and is not good in slag- off, inexpensive slag-forming agents of a high SiO2 content such as silica sand are added. In this case, the SiO2-base slag-forming agents having been sized to fine particles of 1mm. or less are blown together with oxygen gas or inert gas into the molten metal through the refining-oxygen-blowing central pipe of the double tuyeres of the converter bottom. Since slag-forming agents are not blown from the upper part of the converter, they will not be sucked by a dust collector and are melted into the molten slag at an extremely high yield, thus the basicity of the molten slag may be made to the target value at a high success ratio.

9. 发明专利

JPS55161015A BLOWING METHOD FOR BOTTOM BLOWING CONVERTER 失效
公开(公告)号：JPS55161015A
公开(公告)日：1980-12-15
申请号：JP6938479
申请日：1979-06-05
申请人： KAWASAKI STEEL CO
发明人： NAKANISHI KIYOUJI , SUZUKI KENICHIROU , NAGAI JIYUN , KAZUTSUCHI FUMIO
IPC分类号： C21C5/34
摘要： PURPOSE:To reduce the using amount of hydrocarbon and also, to decrease the damage of refractory material of tuyere and its circumference, by keeping the using amount of hydrocarbon for tuyere cooling used at the same time constant, on occasion of exceeding the sending amount of oxygen from the double tube tuyere of furnace bottom more than a fix amount at the time of operating the bottom blowing converter. CONSTITUTION:Oxygen for oxidation refining and hydrocarbon for tuyere cooling, are jetted from the double tube tuyere provided at the bottom of furnace, at the time of refining steel from molten pig iron in the bottom blowing converter. On this occasion, using amount of the hydrocarbon gas for tuyere cooling using jointly with oxygen, is jetted keeping at a constant value without increasing in proportion to the flowing amount of oxygen, when the flowing amount of oxygen gas per sectional area of the tuyere, is made 2.0Nm /min/cm or more. Using amount of the hydrocarbon is able to reduce more than the usual operation and also, exfoliation of refractory brick around tuyere based on excess cooling of the tuyere by spalling and shortening of life of the furnace bottom are prevented.

10. 发明专利

JPS5569211A PREVENTING METHOD FOR METAL STICKING ON INNER WALL OF CONVERTER AT BOTTOMMBLOWN CONVERTER 失效
公开(公告)号：JPS5569211A
公开(公告)日：1980-05-24
申请号：JP14135178
申请日：1978-11-15
申请人： KAWASAKI STEEL CO
发明人： ISHIZAKA KUNIHIKO , UMADA HAJIME , KAZUTSUCHI FUMIO
IPC分类号： C21C5/28 , C21C5/34 , C21C5/46
摘要： PURPOSE:To prevent the sticking of metal on the inner wall of converter without damaging the refractory material of the converter by melting, by jetting inactive gas containing a specific amount of oxygen from the tuyere at the time of inclining converter in tapping time. CONSTITUTION:Sticking of metal on the inner wall of lower opening of converter, is able to repress by using inactive gas containing oxygen of 15-30% as blowing gas at tapping time. Also, removing amount of sticked metal by melting is able to adjust by changing the content of oxygen in blowing gas in the above extent according to the thickness of sticked metal.

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