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WO2011158607A1 - Produit réfractaire à tube de circulation pour four rh - Google Patents

Produit réfractaire à tube de circulation pour four rh Download PDF

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Publication number
WO2011158607A1
WO2011158607A1 PCT/JP2011/061737 JP2011061737W WO2011158607A1 WO 2011158607 A1 WO2011158607 A1 WO 2011158607A1 JP 2011061737 W JP2011061737 W JP 2011061737W WO 2011158607 A1 WO2011158607 A1 WO 2011158607A1
Authority
WO
WIPO (PCT)
Prior art keywords
cylindrical
furnace
refractory
reflux tube
tube refractory
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
PCT/JP2011/061737
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English (en)
Japanese (ja)
Inventor
則孝 橋本
敏昭 西角
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.)
Shinagawa Refractories Co Ltd
Original Assignee
Shinagawa Refractories Co Ltd
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 Shinagawa Refractories Co Ltd filed Critical Shinagawa Refractories Co Ltd
Publication of WO2011158607A1 publication Critical patent/WO2011158607A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/10—Handling in a vacuum
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/013—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics containing carbon
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/03—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite
    • C04B35/04—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite based on magnesium oxide
    • C04B35/043—Refractories from grain sized mixtures
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/42—Non metallic elements added as constituents or additives, e.g. sulfur, phosphor, selenium or tellurium
    • C04B2235/422—Carbon
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance

Definitions

  • the present invention relates to a reflux tube refractory for an RH furnace, and in particular, the reflux tube refractory is formed as a single-piece cylindrical structure, and there is little cracking or breakage, and there is no progress of damage from a joint part, and the durability is excellent.
  • the present invention relates to a new improvement for obtaining a new structure.
  • a refractory for a reflux pipe is used by assembling a refractory member divided in the vertical direction or circumferential direction in a cylindrical structure with a mortar interposed. This is done in order to manufacture the refractory material to be constructed at a low cost, but has a problem of melting from a joint part having poor corrosion resistance and mechanical strength.
  • the can body is deformed by thermal stress during operation, so that mechanical stress acts on the reflux tube, and the refractory may be cracked or broken, or damage may develop.
  • the inner wall of the reflux pipe is formed of a single-piece sleeve brick, thereby suppressing melting damage caused by inserting molten steel into the joint.
  • the inner wall of the reflux tube is formed of a sleeve brick having a thickness of 150 mm, and the connection between the dip tube and the unevenness are formed, thereby forming a boundary between the reflux tube and the dip tube. This prevents melting of the part.
  • Patent Document 3 discloses a repair method in which an integral or divided cylindrical refractory is bonded to a lining with an indeterminate refractory.
  • a cylindrical magnesia carbonaceous brick integrally formed with an inner diameter of 600 mm and an outer diameter of 860 mm is used as the first layer of the reflux tube. Used for eyes.
  • the well-known RH furnace lower tank 1 shown in FIG. 7 is provided with a pair of cylindrical reflux pipe refractories 2, which are shown in FIGS.
  • a lower part 3 formed in a cylindrical shape and a rectangular upper part 4 formed on the upper part of the lower part 3 are formed.
  • the lower part 3 and the upper part 4 are also composed of a plurality of pieces, and the pieces are joined together.
  • only the inner wall was formed as the sleeve 5.
  • the second conventional configuration shown in FIGS. 10 to 12 is the same as the configuration excluding the sleeve 5 in the first conventional configuration described above. Shall be omitted.
  • JP-A-2-25513 Japanese Patent Laid-Open No. 9-241721 Japanese Examined Patent Publication No. 7-62168 JP 2007-197780
  • a Japanese Patent No. 2758585
  • Patent Document 3 since the refractory material is inserted from below and bonded with mortar after removing the damaged portion of the lining, the work is complicated, and there is also a problem in the adhesive strength with the lining.
  • Patent Document 4 only the inner wall uses an integrally structured cylindrical brick, and the entire reflux tube refractory is not made into an integral structure, so that joints are formed on the outer periphery of the cylindrical portion.
  • Patent Document 5 and the second conventional configuration of FIGS. 10 to 12 there is a joint at a portion in contact with the molten steel, and damage from the joint is inevitable.
  • the reflux tube refractory for an RH furnace is a refrigeration tube refractory for an RH furnace that is used in a lower tank of an RH furnace and is composed of a cylindrical reflux tube refractory.
  • the cylindrical structure is composed of a cylindrical lower part and a polygonal or cylindrical upper part having a diameter larger than the diameter of the cylindrical lower part, and The cylindrical structure is composed of a cylindrical lower part and a cylindrical upper part having the same diameter as that of the cylindrical lower part, and the cylindrical structure is formed by an isobaric press.
  • the cylindrical structure is made of MgO—C material, and the C content is 3 to 10%.
  • the reflux tube refractory for an RH furnace is configured as described above, the following effects can be obtained. That is, in the RH furnace reflux tube refractory used for the lower tank of the RH furnace and made of a cylindrical reflux tube refractory, the reflux tube refractory is formed as an integral cylindrical structure, thereby preventing cracks and breakage. In addition, it is possible to obtain a reflux tube that prevents the occurrence of damage from the joint, and the durability can be dramatically improved.
  • the cylindrical structure includes a cylindrical lower part and a polygonal or cylindrical upper part having a diameter larger than the diameter of the cylindrical lower part, and the cylindrical structure includes a cylindrical lower part and a cylindrical lower part.
  • the shape of the upper part can be freely formed, and a shape suitable for the purpose of use can be obtained.
  • the cylindrical structure is formed by an isobaric press, it is possible to easily obtain a freely integrated shape with high accuracy.
  • the cylindrical structure is made of an MgO—C material, and the amount of C is 3 to 10%, so that a spalling resistance can be ensured and a long life configuration can be obtained.
  • FIG. 3 is a front view of FIG. 2. It is a top view which shows the other form of FIG. It is a top view which shows the reflux tube refractory for RH furnaces of FIG.
  • FIG. 6 is a front view of FIG. 5. It is a top view which shows the state by which the conventional RH furnace reflux tube refractory was provided in the RH furnace lower tank. It is a top view which shows the reflux tube refractory for RH furnaces of FIG. It is a front view of FIG.
  • FIG. 1 It is a top view which shows the state by which the conventional RH furnace reflux tube refractory was provided in the RH furnace lower tank. It is a top view which shows the reflux tube refractory for RH furnaces of FIG. It is a front view of FIG.
  • An object of the present invention is to provide a reflux tube refractory for an RH furnace in which the reflux tube refractory is formed as a single-piece cylindrical structure to prevent cracking and breakage and damage from joints. .
  • the reflux pipe refractory 2 is formed by a cylindrical lower part 3 having a cylindrical lower part, and an upper part 4 formed by molding from the cylindrical lower part 3 as a single body is shown in FIG.
  • the cylindrical lower part 3 and the upper part 4 are formed integrally with each other.
  • the upper portion 4 integrally formed with the cylindrical lower portion 3 may be a polygonal shape or a cylindrical shape that is not limited to a quadrangle having a diameter larger than the diameter of the cylindrical lower portion 3, for example, an outer side having an outer diameter.
  • a shape having a diameter of 500 mm to 1300 mm, or 500 mm square to 1000 mm square, and an inner size of an inner hole through which the molten steel passes can be employed, for example, ⁇ 200 mm to ⁇ 800 mm.
  • the thickness as an example, the 650 mm square, the hole diameter was 300 mm, and the minimum thickness portion was 175 mm.
  • the upper part 4 of the reflux pipe refractory 2 is cylindrical, bricks are arranged around the circle, and the joints with the surrounding bricks are large joints close to a triangle, so that the construction is difficult and the joints are difficult. Since damage or the like tends to occur, the upper portion 4 is preferably a polygon such as a square, hexagon, or octagon. Further, since the reflux pipe refractory 2 needs to ensure its mechanical strength, the molding machine is manufactured by well-known CIP molding with a pressurizing force of 1 ton / cm 2 or more. The strength is 30 MPa or more.
  • the refractory pipe 2 has an integral structure as a whole, so there is no joint part, no damage from the joint part, and it is large and integrated with the lower tank base part 1a of the RH furnace lower tank 1. Therefore, the refractory can be prevented from rising due to the molten steel. Moreover, the damage to the reflux tube axial direction in the lower tank bed part 1a can be suppressed.
  • the material of the reflux tube refractory 2 is not particularly limited as a result of various experiments.
  • magnesia-chromic brick, magnesia-carbonaceous unfired brick, alumina-silica brick, alumina-magnesia brick, alumina -Spinel brick can be alumina-spinel-magnesia brick, etc.
  • MgO-C material is most suitable, and as shown in Table 1 of Table 1, C content is less than 3% In this case, the spalling resistance due to slag infiltration decreases, and when it exceeds 10%, there is a concern about the life due to the brittleness of the structure due to decarburization during operation. As a conclusion, the C content is 3% to 10%. % Range is preferred, more preferably 5% to 8%.
  • MgO—C the addition of metallic aluminum powder, metallic silicon powder, boron carbide, etc. is effective in increasing strength and preventing oxidation.
  • a method for producing the reflux pipe refractory 2 will be described.
  • a binder is externally added to a raw material mixture in which MgO and C are blended at a predetermined ratio, and the kneaded clay is put into a rubber frame by an isobaric press, preferably made of a CIP molding method, for example.
  • a mandrel is set in a predetermined shape.
  • the resulting molded body is dried, for example, at 150 to 400 ° C. for 16 to 60 hours. If the drying time is less than 16 hours, it is not preferable because the internal volatile components cannot be removed due to the large-sized product. Further, after drying, baking may be performed at 400 to 800 ° C. for 3 to 20 hours.
  • the firing temperature exceeds 800 ° C. or the firing time exceeds 10 hours, it is not preferable because of surface oxidation. It is preferable to cut, polish, and finish as necessary after molding, drying, or firing.
  • molding method The shaping
  • magnesia-chromic brick, magnesia-carbonaceous unfired brick, alumina-silica brick, alumina-magnesia Brick, alumina-spinel brick, alumina-spinel-magnesia brick can be used for the RH furnace lower tank 1 with a wall or lower tank part 1a lined with an irregular refractory or the like. Therefore, in the present invention, for the purpose of eliminating the joint portion of the reflux tube refractory 2 and increasing the mechanical strength, the conventional divided structure is a large-sized one-piece structure.
  • the cylindrical shape is entirely thick, or the cylindrical lower portion 3 and the upper portion 4 of a polygon (square, hexagonal, octagonal, etc.) having a diameter larger than that of the cylindrical lower portion 3.
  • Reflux tube refractories for RH furnaces according to the present invention can be applied not only to RH furnaces but also to other large furnaces and the like.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Structural Engineering (AREA)
  • Metallurgy (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Compositions Of Oxide Ceramics (AREA)

Abstract

L'invention concerne un produit réfractaire à tube de circulation qui est une structure cylindrique d'un corps simple et qui empêche les fissures, la rupture, et des dommages au niveau des joints. Le produit réfractaire à tube de circulation selon l'invention pour un four RH est utilisé dans un récipient (1) au fond du four RH et comprend un produit réfractaire à tube de circulation cylindrique (2). Ledit produit (2) est configuré comme une structure cylindrique d'un corps simple.
PCT/JP2011/061737 2010-06-14 2011-05-23 Produit réfractaire à tube de circulation pour four rh Ceased WO2011158607A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2010134816A JP2012001742A (ja) 2010-06-14 2010-06-14 Ｒｈ炉用環流管耐火物
JP2010-134816 2010-06-14

Publications (1)

Publication Number Publication Date
WO2011158607A1 true WO2011158607A1 (fr) 2011-12-22

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Application Number Title Priority Date Filing Date
PCT/JP2011/061737 Ceased WO2011158607A1 (fr) 2010-06-14 2011-05-23 Produit réfractaire à tube de circulation pour four rh

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WO (1) WO2011158607A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6092652B2 (ja) * 2013-02-19 2017-03-08 トヨタ自動車株式会社 可変容量型オイルポンプの制御装置
CN108842038A (zh) * 2018-07-03 2018-11-20 洛阳利尔耐火材料有限公司 一种rh精炼炉中改进环流管的砌筑方法
KR102293736B1 (ko) * 2019-12-20 2021-08-27 (주)포스코케미칼 진공탈가스 설비의 상승관 구조 및 이를 포함하는 진공탈가스 설비
JP7303781B2 (ja) * 2020-07-28 2023-07-05 東京窯業株式会社 環流管
CN111732417B (zh) * 2020-08-28 2020-12-08 北京利尔高温材料股份有限公司 一种抗氧化性能优异的耐冲刷超低碳镁碳砖及其制备方法
CN111732416B (zh) * 2020-08-28 2020-12-08 北京利尔高温材料股份有限公司 一种抗氧化、抗剥落性能优异的钢包内衬用超低碳镁碳砖及其制备方法

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0225513A (ja) * 1988-07-14 1990-01-29 Nkk Corp 環流式真空脱ガス装置の下部構造
JPH04168215A (ja) * 1990-10-31 1992-06-16 Kurosaki Refract Co Ltd 真空脱ガス装置中間槽のライニング構造
JPH0514146U (ja) * 1991-02-18 1993-02-23 品川白煉瓦株式会社 真空脱ガス設備用上昇管
JPH10140230A (ja) * 1996-11-08 1998-05-26 Tokyo Yogyo Co Ltd 真空脱ガス装置用浸漬管
JPH11131129A (ja) * 1997-10-27 1999-05-18 Shinagawa Refract Co Ltd 精錬炉の内張り構造
JPH11279629A (ja) * 1998-03-31 1999-10-12 Tokyo Yogyo Co Ltd 真空脱ガス装置用環流管
JP2000160231A (ja) * 1998-11-27 2000-06-13 Harima Ceramic Co Ltd 真空脱ガス装置真空槽の内張り構造
JP2001089808A (ja) * 1999-09-20 2001-04-03 Kurosaki Harima Corp Ｒｈ真空脱ガス炉の内張り構造
JP2003129124A (ja) * 2001-10-17 2003-05-08 Kawasaki Steel Corp Ｒｈ真空脱ガス槽用還流管の構造

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0225513A (ja) * 1988-07-14 1990-01-29 Nkk Corp 環流式真空脱ガス装置の下部構造
JPH04168215A (ja) * 1990-10-31 1992-06-16 Kurosaki Refract Co Ltd 真空脱ガス装置中間槽のライニング構造
JPH0514146U (ja) * 1991-02-18 1993-02-23 品川白煉瓦株式会社 真空脱ガス設備用上昇管
JPH10140230A (ja) * 1996-11-08 1998-05-26 Tokyo Yogyo Co Ltd 真空脱ガス装置用浸漬管
JPH11131129A (ja) * 1997-10-27 1999-05-18 Shinagawa Refract Co Ltd 精錬炉の内張り構造
JPH11279629A (ja) * 1998-03-31 1999-10-12 Tokyo Yogyo Co Ltd 真空脱ガス装置用環流管
JP2000160231A (ja) * 1998-11-27 2000-06-13 Harima Ceramic Co Ltd 真空脱ガス装置真空槽の内張り構造
JP2001089808A (ja) * 1999-09-20 2001-04-03 Kurosaki Harima Corp Ｒｈ真空脱ガス炉の内張り構造
JP2003129124A (ja) * 2001-10-17 2003-05-08 Kawasaki Steel Corp Ｒｈ真空脱ガス槽用還流管の構造

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