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1. 发明专利

JP2001192726A METHOD FOR SMELTING EXTRA-LOW NITROGEN STEEL AND DEGASSING TREATMENT DEVICE 失效
公开(公告)号：JP2001192726A
公开(公告)日：2001-07-17
申请号：JP2000002421
申请日：2000-01-11
申请人： NIPPON KOKAN KK
发明人： TANO MANABU , SAKURAI EIJI , KOMATANI MASANORI , NIMURA YOICHI , TANABE HARUYOSHI
IPC分类号： C21C7/10
摘要： PROBLEM TO BE SOLVED: To develop a technique which prevents molten steel from picking up nitrogen by infiltration of the nitrogen in the atmosphere air from the outside of an immersion pipe of a degassing treatment device when melting extra-low nitrogen steel. SOLUTION: Gas piping 21 is disposed within the thick part of at least the descending side immersion pipe 3 and at a portion of this piping is provided with a gas outlet 21 and is so provided therewith in such a manner that the outlet is not exposed to the outer peripheral surface and inner peripheral surface of the piping 21. Inert gas is filled in the refractory 4 segment within the thick part of the immersion pipe to shut off the infiltration of the nitrogen in the atmosphere air into the immersion pipe. A plurality of the he supply piping 21 for the inert gas for preventing the infiltration of the atmosphere air into the immersion pipe 3 are previously branched from a header pipe 24 and are disposed to improve execution workability and to prevent the leakage of the inert gas.

2. 发明专利

JP2000197810A METHOD FOR LESSENING CARBON DIOXIDE GAS EMISSION 失效
公开(公告)号：JP2000197810A
公开(公告)日：2000-07-18
申请号：JP13711399
申请日：1999-05-18
申请人： NIPPON KOKAN KK
发明人： TAKAHASHI TATSUTO , ISOO NORIO , KATO MAKOTO , TANABE HARUYOSHI
IPC分类号： B01D53/34 , B01D53/62
摘要： PROBLEM TO BE SOLVED: To lessen the emission amount of CO2 to atmospheric air by efficiently absorption-removing CO2 of a waste gas generated in an industrial process. SOLUTION: The concentration of CO2 in a waste gas is lowered by bringing a CO2-containing waste gas into contact with the agglomerate of a solid particle containing CaO and/or Ca(OH)2 and fixing CO2 in the waste gas as CaCO3 in the solid particle. Preferably, the main solid particle to be brought into contact with the CO2-containing waste gas contains water and further preferably the main solid particle to be brought into contact with the CO2-containing waste gas contains water adhering to the surface.

3. 发明专利

JP2000157095A CREATION OR IMPROVEMENT OF ALGA BANK 失效
公开(公告)号：JP2000157095A
公开(公告)日：2000-06-13
申请号：JP35386598
申请日：1998-11-27
申请人： NIPPON KOKAN KK
发明人： TAKAHASHI TATSUTO , ISOO NORIO , KATO MAKOTO , NAKAJIMA HIROHISA , TANABE HARUYOSHI
IPC分类号： A01K61/00 , A01G33/00 , C04B32/00 , C04B40/02
摘要： PROBLEM TO BE SOLVED: To provide a method for creating an alga bank, capable of creating the alga bank in a wide selection range for alga bank creation places with reduced labors at a low cost in a short period and further enabling the creation of the alga bank in a large scale. SOLUTION: This method for creating an alga bank utilizes an existing alga bank itself for the imbedding and growth of the seedlings of sea algae to an artificial base on the basis of the growth action of the sea algae in the existing alga bank. The characteristic of the method for creating the alga bank comprises using an artificial stone material prepared by coagulating and caking the powder and/or granules of a stone material containing a non-carbonated Ca-containing material (excluding slag) or its mixture with slag as a main raw material with a binder comprising CaCO3 produced by the carbonation reaction of the non-carbonated Ca mainly contained in the powder and/or granules, as a material for sinking and disposing in water. The material comprising the artificial stone material is temporarily sunk and disposed on an existing alga bank to imbed and grow sea algae to the surface of the material. The material is then recovered and transferred as a seed material to a place to create a new alga bank. One or more other materials comprising the artificial stone material are disposed around the seed material to spread, imbed and grow the sea algae on the seed material to the other materials.

4. 发明专利

JPH10251730A CONVERTER BLOWING METHOD CAPABLE OF RESTRAINING METAL FROM STICKING ON FURNACE OPENING HOLE 失效
公开(公告)号：JPH10251730A
公开(公告)日：1998-09-22
申请号：JP6362997
申请日：1997-03-17
申请人： NIPPON KOKAN KK
发明人： KODAIRA SATOSHI , TANAKA HIDESHIGE , IZAWA TOMOO , KIKUCHI ICHIRO , KAWASHIMA KAZUTOSHI , TANABE HARUYOSHI
IPC分类号： C21C5/30 , C21C5/46
摘要： PROBLEM TO BE SOLVED: To provide a blowing method hardly causing the sticking of metal to a furnace opening hole in a converter type refining furnace. SOLUTION: The sticking of the metal is restrained by executing the heat having =10kg/t-steel slag in the previous heat and having =80% in the arbitrary continuous plural heats. Further, the pre-dephosphorized molten iron having the P concn. at less than the P concn. required in the product can used.

5. 发明专利

JPH10245617A STEELMAKING METHOD USING PLURAL CONVERTERS 失效
公开(公告)号：JPH10245617A
公开(公告)日：1998-09-14
申请号：JP6739197
申请日：1997-03-05
申请人： NIPPON KOKAN KK
发明人： KOMATSU YOSHIMI , TANABE HARUYOSHI , NAKAJIMA HIROHISA , KODAIRA SATOSHI , KIKUCHI ICHIRO , ARAI MANABU , TANAKA HIDESHIGE
IPC分类号： C21C5/28 , C21C1/02
摘要： PROBLEM TO BE SOLVED: To improve the productivity of a steel by using molten iron having 0.3wt.%, the Si content is preliminary refined into

6. 发明专利

JP2556077B2 失效
公开(公告)号：JP2556077B2
公开(公告)日：1996-11-20
申请号：JP33097887
申请日：1987-12-26
申请人： NIPPON KOKAN KK
发明人： TANABE HARUYOSHI , KAWAKAMI MASAHIRO , TAKAHASHI KENJI , IWASAKI KATSUHIRO , INOE SHIGERU
IPC分类号： C22B5/10 , C21B11/00 , C21B13/00 , C21B13/02 , C21C5/28

7. 发明专利

JPH0835022A SMELTING REDUCTION METHOD FOR NICKEL OXIDE-CONTAINING RAW MATERIAL 失效
公开(公告)号：JPH0835022A
公开(公告)日：1996-02-06
申请号：JP19214794
申请日：1994-07-22
申请人： NIPPON KOKAN KK
发明人： WATANABE ATSUSHI , INOUE AKIHIKO , NAKAMURA HIDEO , INOUE SHIGERU , TANABE HARUYOSHI
IPC分类号： C22B23/00
摘要： PURPOSE:To provide a method, in which the erosion of refractory of a smelting furnace body is restrained and the scattering of charged materials is prevented and the good smelting yield is obtd. and the operating stability of the smelting reduction is secured, by controlling the slag so as to have the suitable composition. CONSTITUTION:In the smelting reduction method by supplying the raw material containing Ni oxide and carbonaceous material into the smelting furnace lined with MgO-base refractory and supplying oxidizing gas, the solid phase ratio of the slag at the operating temp. of the smelting reduction is in the range of -10-60wt.% and the chemical component of the solid phase is composed of MgO and/or compound consisting essentially of MgO. Further, the component series of the slag is substantially a quartenary system of CaO-SiO2-MgO-Al2O3 and the chemical component of the solid phase is MgO and/or compound consisting essentialy of a forsterite, and the basicity indicated with CaO/SiO2 in the slag is composed of

8. 发明专利

JPH07310113A SUPPRESSION OF ATTRITION OF MAGNESIA-BASED REFRACTORY 失效
公开(公告)号：JPH07310113A
公开(公告)日：1995-11-28
申请号：JP9874294
申请日：1994-05-12
申请人： NIPPON KOKAN KK
发明人： MIYATA YASUTO , INOUE SHIGERU , NAKAMURA HIDEO , MIZUKAMI HIDEAKI , WATANABE ATSUSHI , TANABE HARUYOSHI
IPC分类号： C21C5/36 , C21B11/00
摘要： PURPOSE:To provide a method for suppressing the attrition of a magnesia-base refractory with a high melting speed and at lower cost, at the time of suppressing the attrition of the magnesia-base refractory in the vessel lined with the refractory. CONSTITUTION:A magnesia clinker is added so that the magnesia content of the generated sludge is 1-20% excess over the saturation solubility in the sludge to suppress the attrition of a magnesia-base refractory. The magnesia clinker consists of the periclase crystal grains having

9. 发明专利

JPH079017B2 失效
公开(公告)号：JPH079017B2
公开(公告)日：1995-02-01
申请号：JP12224786
申请日：1986-05-29
申请人： NIPPON KOKAN KK
发明人： YAMADA KENZO , USUI TSUTOMU , IWASAKI KATSUHIRO , INOE SHIGERU , TANABE HARUYOSHI , KAWAKAMI MASAHIRO , FUKUMI JUNICHI
IPC分类号： C21B11/00

10. 发明专利

JPH02179807A SMELTING REDUCTION METHOD FOR IRON ORE 失效
公开(公告)号：JPH02179807A
公开(公告)日：1990-07-12
申请号：JP33165788
申请日：1988-12-28
申请人： NIPPON KOKAN KK
发明人： IWASAKI KATSUHIRO , KAWAKAMI MASAHIRO , KAWADA HITOSHI , TANABE HARUYOSHI , TAKAHASHI KENJI , KITAGAWA TORU
IPC分类号： C21B11/00 , C21B13/00
摘要： PURPOSE:To prevent explosion caused by unreacted O2 remaining in a furnace at the starting time of blowing and to stabilize OD ratio at high level by making the pressure in the furnace atmospheric pressure during the specific period at the starting time of the blowing in the subject method with iron bath type smelting reduction furnace. CONSTITUTION:Iron ore and carbonaceous material are supplied in the reduction furnace 1, and O2 is blown on slag 8 through a lance 2 inserted in the furnace 1 at low dynamic pressure, and stirring gas of N2, etc., is blown into the iron bath 7 through blowing holes 3 arranged at the bottom and/or side wall of the furnace. Then, C in the molten iron and C in the carbonaceous material are reacted with the blown O2 to change the generated CO into CO2 and the iron ore is reduced and changed into the molten iron. In this case, at the time of starting the blowing, the pressure in the furnace 1 is substantially made to the atmospheric pressure until CO gas is generated sufficiently. By this method, as decarburizing effect in the molten iron with the blown O2 becomes high, the unreacted O2 can hardly exist in the furnace and in this result, the gas explosion in the furnace can be prevented. After that, as the furnace operation is executed while making the pressure in the furnace high, the lowering of the OD ratio does not occur.

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