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1993 Fiscal Year Final Research Report Summary

新脱ガス法(真空吸引脱ガス法)による融体の高純度化に関する研究

Research Project

Project/Area Number 04555158
Research Category

Grant-in-Aid for Developmental Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 金属精錬・金属化学
Research InstitutionNAGOYA UNIVERSITY

Principal Investigator

SANO Masamichi  NAGOYA UNIVERSITY,DEPARTMENT OF MATERIALS PROCESSING ENGINEERING,PROFESSOR, 工学部, 教授 (70023174)

Co-Investigator(Kenkyū-buntansha) KUDO Ichiro  NIPPON STEEL CORP.MURORAN WORKS,EQUIPMENT TECHNOLOGY DIV., SENIOR MANAGER, 室蘭製鉄所・設備部, 部長代理
MIZUKAMI Yoshimasa  NIPPON STEEL CORP.CENTRAL R&D BUREAU,CHIEF RESEARCHER, 技術開発本部・名古屋技術研究部, 主幹研究員
YAMAMOTO Kimiji  TYK CORP.RESEARCH&DEVELOPMENT CENTER,GENERAL MANAGER, 研究所, 所長
Project Period (FY) 1992 – 1993
KeywordsMOLTEN METAL / HIGH PURITY METAL / VACUUM DEGASSING / DEHYDROGENATION / DENITROGENATION / DEOXIDATION / DECARBURIZATION / POROUS MATERIAL
Research Abstract

A vacuum suction degassing method (VSD method) has been proposed and applied to remove gas-forming impurities in molten metal. The melt is separated from the outside by means of a porous partition wall permeable to gas and impermeable to the melt, and outside is kept at a reduced pressure. Then, the gas-forming impurities gasify at the partition wall-melt interface and the formed gas is sucked through the wall to the outside. Thus, the removal of the impurities from the molten metal is enhanced.
Experiments of decarburization, denitrogenation of molten iron have been performed in the ranges of low concentrations by immersing a porous refractory tube into the melt. The decarburization proceeds by a reaction between the carbon in the melt and the refractory oxide, such as Al_2O_3, SiO_2, etc. The carbon concentration of the melt decreases down to a very low value of a few ppm, while the oxygen concentration is kept below 50ppm. The rate of decarburization with an Al_2O_3-SiO_2 tube is muc … More h higher than that with an Al_2O_3 tube. In crease in gas permeability of the porous tube makes the decarburization rate larger. It is shown that the vacuum suction degassing method can greatly increase the decarburization rate of molten iron. The VSD method has been applied to denitrogenate molten iron. The rate of denitrogenation increases by the simultaneous decarburization. The chemical reaction rate constant for the denitrogenation at the porous tube-molten iron interface is almost equal to that obtained previously by gas blowing onto the melt surface.
The deoxidation of molten copper with graphite has been studied by applying the VSD method. The deoxidation rate decreases due to suction of CO gas and hence lack of stirring by the CO bubbles. However, the minimum oxygen concentration decreases to a lower value than that obtained without using the VSD method.
The VSD method is also shown to be effective in dehydrogenating molten iron and molten aluminum. It is found that the dehydrogenation of molten iron is controlled by the liquid phase and the gas phase mass transfer and that of molten aluminum by the liquid phase mass transfer.
A test of practical application could not have been carried out and is the subject of a future study. Less

  • Research Products

    (13 results)

All Other

All Publications (13 results)

  • [Publications] 佐野正道ら: "真空吸引脱ガス法による溶鉄の脱ガス速度に対する多孔質浸漬管のガス透過性の影響" 材料とプロセス. 6. 191 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Sano et al.: "Vacuum Suction Degassing-Application to Degassing of Molten Metals" Aluminum Cast House Technology,ed.by M.Nilmani,TMS. 125-136 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Sano et al.: "Kinetics of Deoxidation of Molten Copper with Graphite" First Int.Conf.on Processing Materials for Properties,ed.by H.Henein and T.Oki,TMS. 413-416 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 佐野正道ら: "アルゴン吹付けによる溶鉄の脱水素速度" 材料とプロセス. 7. 269 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Sano et al.: "Decarburization Reaction of Molten Iron of Low Carbon Concentration with Vacuum Suction Degassing Method" ISIJ International. 34(発表予定). (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 佐野正道ら: "真空吸引脱ガス法による溶鉄の脱水素速度" 鉄と鋼. 80(発表予定). (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Masamichi Sano et al: "Effect of Gas Permeability of Porous Materials on the Degassing Rate of Molten Iron by Vacuum Suction Degassing Method" Current Advances in Materials and Process(CAMP). vol.6-No.1. 191 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Masamichi Sano et al.: "Vacuum Suction Degassing-Application to Degassing of Molten Metals" Aluminum Cast House Technology, edited by M.Nilmani, TMS. 125-136 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Masamichi Sano et al.: "Kinetics of Deoxidation of Molten Copper with Graphite" First Int.Conf.on Processing Materials for Properties, ed.by H.Henein and T.Oki, TMS. 413-417 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Masamichi Sano et al.: "Removal of Hydrogen from Molten Iron by Ar Gas Blowing" CAMP. vol.7-No.1. 269 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Masamichi Sano et al.: "Decarburization Reaction of Molten Iron of Low Carbon Concentration by Vacuum Suction Degassing Method" ISIJ International. vol.34 (to be published). (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Masamichi Sano et al.: "Removal of Hydrogen from Molten Iron with Vacuum Suction Degassing Method" ISIJ International. (to be published.).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Masamichi Sano et al.: "Removal of Hydrogen from Molten Iron by Vacuum Suction Degassing Method" Tetsu-to-Hagane. (to be published.).

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1996-04-15  

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