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41. 发明专利

JPH02221311A PRODUCTION OF MOLTEN STAINLESS STEEL BY SMELTING REDUCTION 失效
公开(公告)号：JPH02221311A
公开(公告)日：1990-09-04
申请号：JP4227889
申请日：1989-02-21
申请人： NIPPON KOKAN KK
发明人： TANABE HARUYOSHI , TAKI CHIHIRO , IWASAKI KATSUHIRO , KAWAKAMI MASAHIRO , TAKAOKA TOSHIO
IPC分类号： C21B11/00 , C21B13/00 , C22C33/04
摘要： PURPOSE:To produce an Ni-Cr stainless steel by producing an Ni-contg. iron from a molten iron and Ni ore in a converter having an oxygen top blowing lance, side blowing tuyere and bottom blowing tuyere, then charging Cr ore therein, reducing to Ni-Cr iron and subjecting the iron to decarburization refining by O2. CONSTITUTION:The molten iron, the Ni ore and carbonaceous material are charged into the converter type smelting furnace 10 having the oxygen top blowing lance 21, the bottom blowing tuyere 24 and the side blowing tuyere 25. Gaseous O2 is blown from the lance 21 and an inert gas is blown form the bottom blowing tuyere 24 to generate heat and raise temp. with the carbonaceous material as fuel and reducing agent as well as to reduce the Ni ore, by which the Ni-contg. iron is produced. The gaseous CO generated at this time is subjected to secondary combustion at >=30% in molten slag 11 to decrease the slopping of the molten metal. The molten slag is then removed and the Cr ore is charged into the furnace to directly reduce the Ni- contg. molten iron to the Ni-Cr contg. molten iron by the C therein; thereafter, the molten iron 12 is subjected to the oxidation decarburization by oxygen blowing to decarburize the refine the C therein. The Ni-Cr stainless steel is thus inexpensively produced from the molten iron, Ni ore and Cr ore.

42. 发明专利

JP2003112157A SEPARATION EQUIPMENT FOR METAL COMPOUNDED PLASTIC WASTE 审中-公开
公开(公告)号：JP2003112157A
公开(公告)日：2003-04-15
申请号：JP2002198702
申请日：2002-07-08
申请人： NIPPON KOKAN KK
发明人： ASANUMA MINORU , OKADA TOSHIHIKO , TAKAOKA TOSHIO , HIROHANE HIROYUKI , UENO ICHIRO , YOKOYAMA TAKASHI , NARA MASATOSHI
IPC分类号： F23G5/027 , B03B5/28 , B09B3/00 , B09B5/00 , F23G5/16 , F23G7/00
摘要： PROBLEM TO BE SOLVED: To provide a separation equipment for metal compounded plastic waste capable of efficiently separating plastics and an inorganic material. SOLUTION: This separation equipment for metal compounded plastic waste is equipped with a horizontal separation tank housing a heating medium and immersing the metal compounded plastic waste in the heating medium to separate the same, a waste feeder provided to one end of the horizontal separation tank to supply the waste to the horizontal separation tank, a heating medium feeder provided to one end of the horizontal separation tank to supply the heating medium to the horizontal separation tank, a first recovery device provided to the upper part of the other end of the horizontal separation tank to recover floated matter of the metal compounded plastic waste, a second recovery device provided to the lower part of the other end of the horizontal separation tank to recover the sediment of the metal compounded plastic waste, and a heating medium discharge device provided to the upper part of the other end of the horizontal separation tank.

43. 发明专利

JP2002098685A MEASURING PROBE FOR COMPONENT OF MOLTEN METAL 失效
公开(公告)号：JP2002098685A
公开(公告)日：2002-04-05
申请号：JP2000289423
申请日：2000-09-22
申请人： NIPPON KOKAN KK , OSAKA OXYGEN IND
发明人： WASHIMI FUMIHIRO , KIKUCHI YOSHITERU , KAWABATA RYO , KODAIRA SATOSHI , YOSHIDA KAZUO , ISHIDA TOMOHARU , CHINO ATSUSHI , TAKAOKA TOSHIO , INUI TAKASHI , FURUTA CHIKAYOSHI
IPC分类号： G01N1/10 , G01N21/31 , G01N33/20
摘要： PROBLEM TO BE SOLVED: To provide a measuring probe, for the component of a molten metal, which can obtain a stable molten-metal surface in order to measure the component of the molten metal irrespective of a molten-metal bulk condition. SOLUTION: In the measuring probe 1 for the component of the molten metal L, the molten metal L is sampled in order to measure the component of the molten metal L. The measuring probe 1 is provided with a probe body 2 which has a bottomed cylindrical shape and whose lower-part side face comprises molten-metal sampling holes 3 used to sample the molten metal L and a measuring-face formation means by which a gas at a pressure higher than an ambient pressure is introduced into the probe body 2 from the upper part and by which the gas is discharged from the probe body 2 so as to form a molten-metal measuring face S inside the probe body 2 when the probe body 2 is immersed inside the molten metal L.

44. 发明专利

JP2001316711A METHOD FOR DESILICONIZING MOLTEN IRON 失效
公开(公告)号：JP2001316711A
公开(公告)日：2001-11-16
申请号：JP2000135858
申请日：2000-05-09
申请人： NIPPON KOKAN KK
发明人： TAKAOKA TOSHIO , KAWAI YOSHIE , KIKUCHI YOSHITERU , KAWABATA RYO , WATANABE ATSUSHI , AKAI SHINICHI
IPC分类号： C21C7/04 , C21C1/04 , C21C7/072
摘要： PROBLEM TO BE SOLVED: To provide a method stably desiliconizing molten iron into the range of

45. 发明专利

JP2001228083A METHOD FOR DIRECTLY ANALYZING MOLTEN METAL 失效
公开(公告)号：JP2001228083A
公开(公告)日：2001-08-24
申请号：JP2000042097
申请日：2000-02-21
申请人： NIPPON KOKAN KK
发明人： ISHIDA TOMOHARU , KAWABATA RYO , TAKAOKA TOSHIO , KIKUCHI YOSHITERU , CHINO ATSUSHI , SUGIMOTO KAZUMASA , AKIYOSHI TAKANORI
IPC分类号： G01N33/20 , G01N21/31
摘要： PROBLEM TO BE SOLVED: To directly and rapidly analyze a component in a molten metal through atomic absorption analysis, even in case where the surface of the molten metal does not become a stationary surface. SOLUTION: In a method for directly analyzing molten metal by irradiating the surface 5 of the molten metal, by laser and receiving the reflected beam from the surface of the molten metal and calculating the concentration of a target element in the molten metal, on the basis of atomic absorption generated by the metal vapor 9 present in the light path of the reflected beam, measuring laser beam adjusted to the absorption wavelength of the element to be analyzed and comparing laser beam adjusted to a wavelength generating no atomic absorption in the molten are allowed to be incident on the surface of the molten metal using the same optical path to be reflected and the intensities of the reflected beams are continuously measured at a cycle of 10 msec or less, to calculate the absorbancy from the intensities of the reflected beams. Or both the laser beams are reflected, so that irradiation surface on the surface of the molten metal becomes a diameter of 5 mm or larger to calculate absorbancy from the intensities of the reflected beams.

46. 发明专利

JP2001165856A DUST-CONCENTRATION MEASURING METHOD 失效
公开(公告)号：JP2001165856A
公开(公告)日：2001-06-22
申请号：JP35419699
申请日：1999-12-14
申请人： NIPPON KOKAN KK
发明人： KAWABATA RYO , TAKAOKA TOSHIO , ARAI MANABU , TANAKA HIDESHIGE , TACHIKAKE KAZUNORI , WATANABE ATSUSHI , IZUNAGA TAKAKI
IPC分类号： G01N21/15 , C21C5/40 , C21C5/46 , G01N21/59
摘要： PROBLEM TO BE SOLVED: To provide a dust-concentration measuring method using light transmission ensuring a continuous measurement for a long period of time without deterioration of the measurement accuracy caused by dust adherence. SOLUTION: This dust-concentration measuring method comprises the steps of continuous by sampling dust-containing water, diluting the sampled dust- containing water by a predescribed amount of dilution water, measuring the ratio of a light attenuation factor of the diluted dust-containing water, and measuring the dust concentration of the dust-containing water from the measured ratio of light attenuation factor based on the relation between the premeasured dust concentration and the light attenuation factor of a sample solution. This measuring method further comprises the step of cleaning an inner wall of a light attenuation factor measuring part 3 within a continuous measurable time defined by an equation (1) TO=5O/(COXD), or replacing the light attenuation factor measuring part with another one which was cleaned preliminarily. In the equation (1), TO: is a continuous measurable thime(min), CO: average dust concentration of the diluted dust-containing water within the measuring time (g/I), D: light transmission thickness in the light attenuation factor measuring part (cm).

47. 发明专利

JPH1192814A CONVERTER BLOWING FOR RESTRAINING GENERATION OF DUST 失效
公开(公告)号：JPH1192814A
公开(公告)日：1999-04-06
申请号：JP27332197
申请日：1997-09-22
申请人： NIPPON KOKAN KK
发明人： TAKAOKA TOSHIO , KAWABATA RYO , KIKUCHI ICHIRO , KODAIRA SATOSHI , TANAKA HIDESHIGE
IPC分类号： C21C5/38 , C21C5/30
摘要： PROBLEM TO BE SOLVED: To provide a converter blowing method which restrains the generation of dust at the time of producing a steel by executing decarburize-refining to dephosphorized molten iron. SOLUTION: In a converter steelmaking method by mainly executing the decarburize-refining, when using P kgf/cm as dynamic pressure of a top-blown jet given to molten iron surface, the P is controlled in the range of 0.3 /min/T.

48. 发明专利

JPH09170013A METHOD FOR MELTING EXTRA-LOW CARBON AND HIGH MANGANESE STEEL 失效
公开(公告)号：JPH09170013A
公开(公告)日：1997-06-30
申请号：JP32913895
申请日：1995-12-18
申请人： NIPPON KOKAN KK
发明人： SAKURAI EIJI , KAWASHIMA HITOSHI , KAMEMIZU AKIRA , TANO MANABU , MATSUNO EIJU , TAKAOKA TOSHIO , MURAI TAKESHI , HIDE KANJI
IPC分类号： C21C7/068 , C21C7/10
摘要： PROBLEM TO BE SOLVED: To provide a melting method of an extra-low carbon and high manganese steel which can restrain a manganese loss quantity, oxidized loss quantity and vaporized loss quantity on a slag-metal interface. SOLUTION: At the time of melting the extra-low carbon and high manganese steel by using a vacuum degassing equipment and executing decarburizing treatment to molten high manganese steel, the carbon concn. in the molten steel before the decarburizing treatment is made to be

49. 发明专利

JPH09157728A METHOD FOR SMELTING CLEAN STEEL 失效
公开(公告)号：JPH09157728A
公开(公告)日：1997-06-17
申请号：JP31546295
申请日：1995-12-04
申请人： NIPPON KOKAN KK
发明人： MATSUNO EIJU , TAKAOKA TOSHIO , MURAI TAKESHI , KAWASHIMA KAZUTOSHI , SAKURAI EIJI
IPC分类号： C21C7/06 , C21C7/10
摘要： PROBLEM TO BE SOLVED: To provide a smelting method of a clean steel, by which the cleanliness of molten steel is improved and the smelting of the steel having little defect caused by inclusion can be simply executed. SOLUTION: At the time of adding cold material while circulating the molten steel by blowing gas in a circulating flow type vacuum degassing apparatus, the cold material adding quantity W (kg/ton of molten steel) and the circulating flow time (t) (min.) are adjusted so as to become the range regulated as the following inequality. t>=0.25W+2.

50. 发明专利

JPH09125127A MANUFACTURE OF TUYERE BRICK 失效
公开(公告)号：JPH09125127A
公开(公告)日：1997-05-13
申请号：JP28371295
申请日：1995-10-31
申请人： NIPPON KOKAN KK
发明人： KOMATANI MASANORI , IZAWA TOMOO , KATO HISAKI , TAKAOKA TOSHIO
IPC分类号： C21C5/48
摘要： PROBLEM TO BE SOLVED: To manufacture a tuyere brick without developing the deformation and the breakage to a pipe body for tuyere at the time of forming, even in the case of using a material having poor elasticity, such as a ceramics, as the pipe body for tuyere of the bottom-blown tuyere brick used to the furnace bottom of a converter for steelmaking. SOLUTION: The tuyere brick body 2 is divided into a lower brick body 2a and an upper brick body 2b, and semicircular-shape grooves 3a, 3b matched to the pipe body 1 for tuyere are arranged on the lower brick body 2a and the upper brick body 2b. The pipe body 1 for tuyere is fitted to the groove 3a of the lower brick body 2a, and the upper brick body 2b is laid on the lower brick body by matching the groove 3b to the pipe body 1 for tuyere and this assembly is shaped.

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