EP0462537A1 - Vorrichtung zur Vakuumentgasung - Google Patents

Vorrichtung zur Vakuumentgasung Download PDF

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Publication number
EP0462537A1
EP0462537A1 EP91109888A EP91109888A EP0462537A1 EP 0462537 A1 EP0462537 A1 EP 0462537A1 EP 91109888 A EP91109888 A EP 91109888A EP 91109888 A EP91109888 A EP 91109888A EP 0462537 A1 EP0462537 A1 EP 0462537A1
Authority
EP
European Patent Office
Prior art keywords
melt
porous member
vacuum
gas
porous
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP91109888A
Other languages
English (en)
French (fr)
Inventor
Masamichi Sano
Nobuo Miyagawa
Kunji Yamamoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TYK Corp
Original Assignee
TYK Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by TYK Corp filed Critical TYK Corp
Publication of EP0462537A1 publication Critical patent/EP0462537A1/de
Ceased legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
    • C22B9/04—Refining by applying a vacuum

Definitions

  • the present invention relates to a vacuum-suction degassing apparatus, in which gas-forming solute ingredients are removed or recovered from a melt, such as a molten metal, matte, or slag, through a porous member.
  • a melt such as a molten metal, matte, or slag
  • the RH method, DH method, and other degassing methods are used to remove gas-forming solute ingredients from a molten metal.
  • a large quantity of argon gas is blown into the melt, the surface of which is kept at a vacuum or at reduced pressure so that the partial pressure of the gas-forming ingredients is lowered, thereby removing these ingredients.
  • the object of the present invention is to provide a vacuum-suction degassing apparatus, in which gas-forming ingredients can be easily removed from a melt without using a large quantity of argon gas, so that the melt can be degassed at low cost by means of a simple apparatus.
  • a vacuum-suction degassing apparatus a vessel containing a melt; a porous member made of a porous material permeable to gas and impermeable to melts, a portion thereof being immersed in said melt in the vessel; and sucking means for sucking gas from said melt or gas produced by a reaction between said melt and said porous material through said partitioning member, in a manner such that the portion of said porous member which protrude over the surface of said melt is kept at a vacuum or at a reduced pressure.
  • a vacuum-suction degassing apparatus a vessel containging a melt; a cylindrical non-porous member; a porous member made of a porous material permeable to gas and impermeable to melts, being fitted into the lower portion of said non-porous member and immersed in said melt in said vessel; and sucking means for sucking gas from said melt or gas produced by a reaction between said melt and said porous material through said partitioning member, in a manner such that the inside of said non-porous member is kept at a vacuum or at a reduced pressure.
  • the partitioning member is sucked by said sucking means, thereby the inside of the partitioning member being kept at a vacuum or at reduced pressure.
  • the melt is stirred by moving said partitioning member in said melt by said stirring means so that gas in the melt or gas produced by the reaction between the melt and the porous member can be moved to vacuum or reduced pressure space inside the partitioning member through said partitioning member made of a porous material with high efficiency.
  • the vacuum suction degassing apparatus according to the present invention does not have to use argon gas, so that its running cost is low and also it is possible to suppress generation of splashes and reduce deposition of base metal onto a wall surface of the apparatus.
  • it is possible to reduce the equipment cost as well as its running cost.
  • a portion of a porous member made of a porous material which allows permeation of gases but does not allow permeation of molten materials is immersed in a melt, and another portion of said porous member which protrudes above the surface of melt is put in vacuum or under reduced pressure. Gases of said melt or gases produced by reactions between said melt and said porous material are sucked through said porous member by sucking means.
  • a porous member is fitted into the lower portion of a cylindrical non-porous member and the porous member is immersed in said melt. Inside of said non-porous member is evacuated or depressurized, and gases in said melt or gases produced by reactions between said melt and said porous material are sucked through said porous member by sucking means.
  • solute components in the melt which produce a gas phase, can easily be moved to the vacuum or reduced pressure atmosphere.
  • argon gas is not blown into, or a small volume of argon gas only enough to stir the melt is blown, so that an amount of argon gas used can remarkably be reduced. Also, as the amount of argon gas is extremely low, generation of splashes is suppressed, and deposition of base metal on a wall surface of a device can be reduced. For this reason, according to the present invention, equipment cost can be reduced by minimizing size of the apparatus, and also running cost can remarkbly be reduced.
  • Partitioning member 1 is made of a porous material which is permeable to gas, but impermeable to melts, such as molten metal, molten matte, or molten slag. If melt 2 is brought into contact with one side of porous member 1, and if the other side of member 1 is kept at a vacuum or at a reduced pressure 3, the pressure on the wall surface in contact with the melt drops without regard to the static pressure of melt 2.
  • gas-forming ingredients can be removed from the melt on the basis of the principle described above, and brought the present invention to completion.
  • the impurities in the melt may react with the ingredients of the porous member, to form gases, and then they may be removed through the porous member.
  • porous member is an oxide (M X O Y )
  • the impurities such as N , H , C , O , and S , and the valuable components are sucked and removed or recovered from the melt.
  • the present invention by adjusting content of components of the partitioning member which react with the impurities or valuable components in a melt, it is possible to control a reaction rate between the impurities or valuable components in the melt and components of the partitioning member.
  • a heating means may be added to heat a porous member or a melt by energizing the porous member or burying a resistance wire previously in the porous member and energizing the resistance wire, or by heating the melt from outside (by means of, for instance, plasma heating), for the purpose to prevent the decrease of temperature of the melt due to heat emission to atmosphere or the vessel or the decrease of temperature of the melt which occurs when the porous member is immersed into the melt, or decrease of temperature of the melt due to an endothermic reaction between components of the porous member and the melt.
  • porous member including metal oxides or other metallic compounds (non-oxides), carbon and mixtures thereof and metal, such as Al2O3, MgO, CaO, SiO2, Fe2O3, Fe3O4, Cr2O3, BN, Si3N4, SiC, C, etc.
  • the material used should not react with the principal ingredient of melt 2 so that porous member in contact with melt 2 can be prevented from erosion loss and melt 2 can be kept clean.
  • a material which hardly gets wet with melts must be used for the partitioning member so that only gases can pass through the partitioning member but any melt can not pass through the partitioning member. Furthermore, it is preferable that a porosity of the partitioning member is not more than 40%.
  • Fig.2 is a schematic cross-sectional view showing a vacuum-suction degassing apparatus according to an embodiment of the present invention.
  • Melt 2 is stored in vessel 5, and a lower half portion of porous member 6 is immersed in this molten material 2.
  • Porous member 6 has a form of rod, and is made of a porous material having pores which is permeable to gases and impermeable to melts, such as molten metal, molten slag, and molten matte. Therefore, melt 2 do not pass through.
  • Vessel 5 is placed in a decompression container (not shown), and inside of the decompression container is evacuated by the vacuum pump to maintain the inside in vacuum or under reduced pressure.
  • melt 2 does not permeate through porous member 6, but as gases contained in pores of porous member 6 are released to inside of the decompression container, inside of pores of porous member 6 are evacuated or depressurized. Therefore, gases in melt 2 or gases produced by reactions between components of the porous member 6 and the melt 2 pass through the pores of porous member 6, and are released into vacuum or reduced pressure atmosphere in the decompression container. And, the gases are sucked by the vacuum pump and removed from inside of the decompression container.
  • Fig.3 is a schematic cross-sectional view showing a vacuum suction degassing apparatus according to an embodiment of the second invention in this application.
  • Porous member 6a has a form of rod, and is fitted into the lower portion of cylindrical non-porous member 8 in a liquid-sealing manner.
  • Porous member 6a is made of a porous material having pores which gases can permeate through but melt 2, such as molten metal, molten slag, or molten matte can not enter and permeate through.
  • non-porous member 8 is made of a non-porous material which gases can not permeate through, and is linked to a vacuum pump (not shown).
  • porous member 6a has only to be immersed in molten material 2, and even if depth of a melt bath is small, degasification of molten materials can be performed.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
EP91109888A 1990-06-16 1991-06-17 Vorrichtung zur Vakuumentgasung Ceased EP0462537A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2158324A JPH0830227B2 (ja) 1990-06-16 1990-06-16 真空吸引式脱ガス装置
JP158324/90 1990-06-16

Publications (1)

Publication Number Publication Date
EP0462537A1 true EP0462537A1 (de) 1991-12-27

Family

ID=15669154

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91109888A Ceased EP0462537A1 (de) 1990-06-16 1991-06-17 Vorrichtung zur Vakuumentgasung

Country Status (3)

Country Link
EP (1) EP0462537A1 (de)
JP (1) JPH0830227B2 (de)
CA (1) CA2044725A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007016891A (ja) * 2005-07-07 2007-01-25 Noritz Corp エア抜き弁

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2752233A (en) * 1948-03-08 1956-06-26 Saint Gobain Method for extracting simple elements from fusible materials containing them
AT188038B (de) * 1954-09-11 1956-12-27 Roland Dr Mitsche Verfahren zur Entgasung von Flüssigkeiten, insbesonders von metallischen Schmelzen
GB829777A (en) * 1955-08-09 1960-03-09 Fischer Ag Georg Improvements in or relating to processes for refining liquid melts by degasification, and to apparatus for carrying such processes into effect

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5278602A (en) * 1975-12-25 1977-07-02 Toyota Motor Corp Vacuum degassing of molten metal

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2752233A (en) * 1948-03-08 1956-06-26 Saint Gobain Method for extracting simple elements from fusible materials containing them
AT188038B (de) * 1954-09-11 1956-12-27 Roland Dr Mitsche Verfahren zur Entgasung von Flüssigkeiten, insbesonders von metallischen Schmelzen
GB829777A (en) * 1955-08-09 1960-03-09 Fischer Ag Georg Improvements in or relating to processes for refining liquid melts by degasification, and to apparatus for carrying such processes into effect

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 10, no. 219 (C-363)(2275), 31 July 1986; & JP - A - 6156257 (JAPAN METALS & CHEM.), 20.03.1986 *

Also Published As

Publication number Publication date
CA2044725A1 (en) 1991-12-17
JPH0830227B2 (ja) 1996-03-27
JPH0448025A (ja) 1992-02-18

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