EP0462538B1 - Dispositif de dégazage continu sous vide - Google Patents

Dispositif de dégazage continu sous vide Download PDF

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Publication number
EP0462538B1
EP0462538B1 EP91109889A EP91109889A EP0462538B1 EP 0462538 B1 EP0462538 B1 EP 0462538B1 EP 91109889 A EP91109889 A EP 91109889A EP 91109889 A EP91109889 A EP 91109889A EP 0462538 B1 EP0462538 B1 EP 0462538B1
Authority
EP
European Patent Office
Prior art keywords
melt
vacuum
porous
gases
degassing
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.)
Expired - Lifetime
Application number
EP91109889A
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German (de)
English (en)
Other versions
EP0462538A1 (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
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Filing date
Publication date
Application filed by TYK Corp filed Critical TYK Corp
Publication of EP0462538A1 publication Critical patent/EP0462538A1/fr
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    • 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 continuous degassing apparatus, in which gas-forming solute ingredients are removed or recovered from a metallurgical melt, such as a molten metal, matte, or slag, through a porous member.
  • a metallurgical 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.
  • GB-A-829 777 a vacuum-suction degassing apparatus is known.
  • Said GB-A-829 777 discloses a device for degassing liquid melts, wherein two chambers are separated from one another by a preferably metallic wall having a portion which is gas-permeable but which portion is not permeable to the liquid melt. The melt is introduced into the one chamber while in the other chamber there is maintained low pressure so as to have a refining effect.
  • a first surface of a porous member which is made of a porous materials permeable to gas and impermeable to melts, contact the melt, and a second surface is kept in vacuum or under reduced pressure, so that gases in the melt or gases produced by reactions between the melt and components of the porous member permeate through said porous member from the first surface side to the second surface side, and are released on the second surface into vacuum or depressurized atmosphere.
  • a pipe member is buried in said porous member and a cooling medium flows in the pipe member, so that said porous member is cooled together with said pipe member, thus softening and melting thereof being prevented.
  • degasfication of the melt can be performed continuously. Also, if the melt penetrates into pinholes of the porous member. the melt is cooled by the pipe members and solidified so that the intrusion of melt into the vacuum atmosphere side can be prevented.
  • argon gas is not blown, or a small volume of argon gas only enough to stir the molten metal is blown, so that an amount of argon gas 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 the apparatus can be reduced. Thus, according to this invention, reduction of equipment cost by minimizing the apparatus and remarkable reduction of running cost can be realized.
  • 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 ar at a reduced pressure 3, the pressure on the wall surface in contact with the melt drops without regard to the static pressure of the 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.
  • porous member including metallic oxides or other metallic compounds (non-oxides), carbon and mixtures thereof and metal, such as Al 2 O 3 , MgO, CaO, SiO 2 , Fe 2 O 3 , Fe 3 O 4 , Cr 2 O 3 , BN, Si 3 N 4 , 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% and its diameter is about 200 ⁇ m or less.
  • said pipe member buried in the porous member strengthens the porous member.
  • the pipe member when degasfication of melt is peformed continuously and for a long time, the pipe member is easy to be fused.
  • a cooling medium flows through the pipe member, softening and melting of the pipe member due to heat from melt can be prevented. For this reason, degasification can be made for a long time. Also, for instance, if the melt penetrates into pinholes of the porous member, the melt is cooled by the pipe members and solidified so that the intrusion of melt into the vacuum atmosphere side can be prevented.
  • Fig. 2 is a schematic cross-sectional view showing the vacuum suction-continuous degassing apparatus according to the first embodiment of this invention.
  • Cylindrical melt flow pipe 15 made of a porous material is arranged penetrating vacuum container 14. And, at both edges of melt flow pipe 15 are connected to melt flow pipe 15a.
  • Vacuum container 14 is connected to a vacuum pump in an appropriate manner, and inside of vacuum container 14 is kept in a vacuum state.
  • Melt flow pipe 15 is made of a porous material, and this melt flow pipe 15 has pores which allows permeation of gases but does not allows permeation of melts 2 such as molten metal, molten slag, and molten matte. Also, in the pipe wall of this melt flow pipe 15 is buried a pipe-formed center member 16 in the form of coil. And, a cooling medium such as gas or liquid flows in center member 16.
  • melt 2 flows in flow pipe 15 and passes through vacuum container 14 a portion of melt 2 contacting flow pipe 15 is exposed to vacuum through this flow pipe made of this porous material. With this, gases in melt 2 or gases generated through reactions between melt 2 and the porous member are removed, and a processing to remove gas generating components from melt 2 can be made continuously.
  • Fig. 3 is a cross-sectional view showing a vacuum suction continuous degassing apparatus according to the second embodiment of this invention.
  • a plurality of plate-formed banks 21 are arranged at an interval in parallel to each other.
  • plurality of melt pass-through holes 22 penetrating in the direction of width thereof are arranged at one edge in the direction of width thereof in the direction of height of bank 21.
  • plurality of gas suction holes 23 penetrating in the direction of height thereof are formed and arranged in the direction of width of bank 21.
  • pipe form of center member 24 is buried in bank 21.
  • This bank 21 is made of a porous material having pores which allows permeation of gases but does not allow intrusion of melts such as molten metal, molten slag, and molten matte.
  • entrance 20a and exit 20b for melt 2 are arranged in container 20.
  • melt 2 enters container 20 from entrance 20a, and a flow route thereof is restricted by bank 21.
  • This melt 2 passes through melt pass-through hole 22 of bank 21 and flow in a zigzag form, when viewed from a top, in container 20 as shown by arrow marks in the figure.
  • gas suction holes 23 arranged in bank 21 are kept in vacuum via piping (not shown), and melt is exposed to a vacuum state via bank 21 while flowing with a flow route restricted by bank 21. With this, gas generating components in melt 2 are removed.
  • center member wherein cooling liquid or cooling gas flows is buried in bank 21, softening or melting of center member 24 is prevented. For this reason, the apparatus can be run continuously.
  • melt 2 is cooled and solidified around center member 24, so that intrusion of melt into gas suction holes 23 can be prevented.
  • degasification of a melt can be made continuously, and as an area where the melt contacts the porous member is large, gas-forming components in the melt can be removed at a high efficiency.
  • Fig. 4 is a cross-sectional view of a vacuum-suction continuous degassing apparatus according to the third embodiment of this invention.
  • Melt 2 flows through entrance for melt 33 into container 31 from near a wall surface of box-type container 31, and traverses container 31, and then flows out through exit for melt 34 from near another wall surface facing the aforementioned wall surface of container 31 to the outside.
  • Degassing member 32 comprises a plurality of partition members 32b having a form like a cylinder with the lower edge closed and non-porous member 32 linked to the upper edge of these partition members 32b.
  • degassing member 32 is buried a pipe-formed center member (not shown) with edges of the center edges leading to outside and connected to a cooler to feed a cooling gas or a cooling liquid into inside of the center member.
  • degassing member 32 with partition member 32b immersed in melt 2 is allocated above container 31.
  • degassing member 32 is linked to an appropriate vacuum system, and inside of degassing member 32 is kept in a vacuum state being sucked by this vacuum system.
  • Partition block 32b is made or a porous material having pores which gases can permeate through and melts such as molten metal, molten slag, and molten matte can not permeate through.
  • non-porous member 32a is made of a material which does not allow permeation of any gas, or a processing to inhibit permeation of gases is applied to non-porous member 32a.
  • Degassing member 32 can be made, for instance, by using pipe assembled into a specified form as a center member, allocating a porous material around the center member and forming it into a form of degassing member 32, and coating upper portion of degassing member 32 with a non-porous material which does not allows permeation of any gas to obtain a non-porous member 32a.
  • melt 2 enters container 31 from entrance 33, traverses container 31, and flows out from exit 34. Inside of degassing member is kept in a vacuum, and melt 2 is exposed to a vacuum state through partition member 32b while flowing in container 31. And, gas-forming components in melt 2 moves through partition member 32b to inside of degassing member 32. As a cooling gas or a cooling liquid is flowing in the center member buried in degassing member 32, softening or melting of the center member due to heat of melt 2 can be prevented, and degasification of melt 2 can be made continuously. Also, melts going into degassing member 32, for instance, through a pinhole in the partition member 32 is cooled by a liquid or a gas flowing in the center member, so that intrusion of melt 2 into degassing member 32 can be prevented.
  • an external heating apparatus can be arranged to heat the melt.
  • a filter with small pressure loss may be arranged between the degassing apparatus and the vacuum system to solidify and trap the melt.

Landscapes

  • 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)

Claims (5)

  1. Dispositif de dégazage en continu par aspiration sous vide pour dégazer un produit métallurgique fondu (2) comprenant :
    un élément poreux (15, 21, 32b) construit en un matériau poreux lequel est perméable aux gaz et imperméable aux produits métallurgiques fondus (2) ;
    des moyens (15a, 20, 20a, 20b, 31) pour mettre en contact une première surface dudit élément poreux (15, 21, 32b) avec ledit produit métallurgique fondu (2) ;
    des moyens (14, 23, 32) pour mettre en contact une seconde surface dudit élément poreux (15, 21, 32b) avec le vide ou une atmosphère dépressurisée grâce à quoi les gaz contenus dans ledit produit métallurgique fondu (2) ou les gaz produits par des réactions entre ledit produit métallurgique fondu (2) et les composants dudit élément poreux (15, 21, 32b) sont aspirés à travers ledit élément poreux (15, 21, 32b) vers le côté de la seconde surface ;
    un élément formant tuyau (16, 24) noyé dans ledit élément poreux (15, 21, 32b) ; et
    des moyens de refroidissement pour faire circuler un milieu de refroidissement à travers ledit élément formant tuyau (16, 24).
  2. Dispositif de dégazage en continu par aspiration sous vide, selon la revendication 1, caractérisé en ce qu'il comprend encore :
       des moyens de chauffage pour chauffer ledit produit métallurgique fondu (2).
  3. Dispositif de dégazage en continu par aspiration sous vide, selon la revendication 1, caractérisé en ce que ledit élément poreux (15) a une forme cylindrique, en ce que ladite première surface est constituée par sa surface interne et en ce que ladite seconde surface est constituée par sa surface externe.
  4. Dispositif de dégazage en continu par aspiration sous vide, selon la revendication 1, caractérisé en ce que ledit élément poreux (21) a la forme d'une plaque comprenant des surfaces avant et arrière et des trous traversants (23) pour le passage des gaz, ladite première surface est formée sur les surfaces avant et arrière, et ladite seconde surface est formée par ladite surface interne desdits trous traversants (23) pour le passage des gaz.
  5. Dispositif de dégazage en continu par aspiration sous vide, pour dégazer un produit métallurgique fondu (2) comprenant :
    une pluralité d'éléments poreux (32b) ayant chacun une forme cylindrique fermée au fond ;
    un élément de dégazage (32) relié en commun aux parties supérieures desdits éléments poreux (32b) ;
    des moyens pour appliquer à l'intérieur desdits éléments poreux (32b) un vide ou une atmosphère à pression réduite par l'intermédiaire dudit élément de dégazage (32), de façon à aspirer des gaz contenus dans ledit produit métallurgique fondu (2) ou des gaz produits par des réactions entre ledit produit métallurgique fondu (2) et des composants desdits éléments poreux (32b) ;
    un élément de formant tuyau noyé dans lesdits éléments poreux (32b) ; et des moyens de refroidissement pour faire circuler un milieu de refroidissement à travers ledit élément formant tuyau.
EP91109889A 1990-06-16 1991-06-17 Dispositif de dégazage continu sous vide Expired - Lifetime EP0462538B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2158325A JPH0753894B2 (ja) 1990-06-16 1990-06-16 真空吸引式連続脱ガス装置
JP158325/90 1990-06-16

Publications (2)

Publication Number Publication Date
EP0462538A1 EP0462538A1 (fr) 1991-12-27
EP0462538B1 true EP0462538B1 (fr) 1996-10-16

Family

ID=15669176

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91109889A Expired - Lifetime EP0462538B1 (fr) 1990-06-16 1991-06-17 Dispositif de dégazage continu sous vide

Country Status (6)

Country Link
EP (1) EP0462538B1 (fr)
JP (1) JPH0753894B2 (fr)
AT (1) ATE144293T1 (fr)
CA (1) CA2044722A1 (fr)
DE (1) DE69122667T2 (fr)
ES (1) ES2096602T3 (fr)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE817814C (de) * 1950-02-12 1951-10-22 Hellmuth Holz Dr Anordnung von Kuehlrohren in Schmelzgefaessen
US2809107A (en) * 1953-12-22 1957-10-08 Aluminum Co Of America Method of degassing molten metals
DE1032553B (de) * 1955-08-09 1958-06-19 Fischer Ag Georg Verfahren zur Entgasung von fluessigen Schmelzen und Vorrichtung zur Durchfuehrung des Verfahrens
US2859262A (en) * 1955-09-05 1958-11-04 Hoerder Huettenunion Ag Apparatus for degasifying liquid metal
GB1253841A (en) * 1968-02-25 1971-11-17 Pilkington Brothers Ltd Improvements in or relating to the extraction of gases from a molten metal bath

Also Published As

Publication number Publication date
ES2096602T3 (es) 1997-03-16
CA2044722A1 (fr) 1991-12-17
ATE144293T1 (de) 1996-11-15
JPH0448026A (ja) 1992-02-18
DE69122667D1 (de) 1996-11-21
EP0462538A1 (fr) 1991-12-27
DE69122667T2 (de) 1997-03-13
JPH0753894B2 (ja) 1995-06-07

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