WO2015111394A1 - 溶融金属容器のライニング構造体の製造方法及び溶融金属容器のライニング構造体 - Google Patents
溶融金属容器のライニング構造体の製造方法及び溶融金属容器のライニング構造体 Download PDFInfo
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- WO2015111394A1 WO2015111394A1 PCT/JP2015/000185 JP2015000185W WO2015111394A1 WO 2015111394 A1 WO2015111394 A1 WO 2015111394A1 JP 2015000185 W JP2015000185 W JP 2015000185W WO 2015111394 A1 WO2015111394 A1 WO 2015111394A1
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- molten metal
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D1/16—Making or repairing linings increasing the durability of linings or breaking away linings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/02—Linings
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- 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
- C04B35/10—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 aluminium oxide
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- 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
- C04B35/10—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 aluminium oxide
- C04B35/101—Refractories from grain sized mixtures
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- 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
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/04—Blast furnaces with special refractories
- C21B7/06—Linings for furnaces
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- 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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/44—Refractory linings
- C21C5/441—Equipment used for making or repairing linings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D1/0003—Linings or walls
- F27D1/0006—Linings or walls formed from bricks or layers with a particular composition or specific characteristics
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- 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
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B2235/3206—Magnesium oxides or oxide-forming salts thereof
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- 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
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B2235/3208—Calcium oxide or oxide-forming salts thereof, e.g. lime
- C04B2235/321—Dolomites, i.e. mixed calcium magnesium carbonates
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- 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
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
- C04B2235/3222—Aluminates other than alumino-silicates, e.g. spinel (MgAl2O4)
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- 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
- C04B2235/80—Phases present in the sintered or melt-cast ceramic products other than the main phase
Definitions
- the present invention relates to a manufacturing method of a lining structure of a molten metal container and a lining structure of a molten metal container.
- the lining structures of various molten metal containers are the outer shells of the molten metal container.
- steel shell is provided, and is made up of a permanent refractory and a lining refractory in order toward the inside of the molten metal container.
- the working surface of the innermost refractory (working face refractory) is in contact with the molten metal.
- the characteristics of the lining refractory in the molten metal container are required to have corrosion resistance against slag, which is a molten metal and a coexisting molten oxide, and resistance to spalling due to temperature change.
- lining refractories containing alumina and magnesia undergo spinelization by sintering after construction.
- the volume of the refractory expands as the spinelization progresses, and the voids present in the refractory decrease. Accordingly, the refractory can be densified to reduce the porosity, and the slag can be prevented from entering the refractory, so that the wear rate of the refractory can be reduced.
- Patent Document 1 alumina and magnesia that are not spineled are used as main materials as the refractory for the lining, and after the refractory for the lining is applied, firing is performed at a high temperature of 1300 ° C. or more for 4 hours or more. By doing so, it is disclosed to spinel the refractory for lining before using the molten metal container.
- Patent Document 2 proposes that a small amount of silica (silica) that lowers the melting point is added to rapidly advance spinelization.
- Patent Document 2 a small amount of silica that lowers the melting point is added and a liquid phase is partially generated, so that a rapid spinel formation is achieved with respect to normal solid phase diffusion.
- the decrease in fire resistance due to the addition of silica impairs the advantage of spinelization that densifies the refractory and prevents the intrusion of slag.
- fire resistance is inferior compared to.
- the present invention has been made for such a problem, and does not require a strong burner facility as in the prior art, and a method for producing a molten metal container lining structure having sufficient fire resistance and melting
- An object of the present invention is to provide a lining structure for a metal container.
- Non-fired refractory containing 60% by mass or more of alumina and 4% by mass or more of magnesia as the lining refractory and having a linear change rate at room temperature of 0.8% or more before and after heat treatment at 1500 ° C. for 3 hours.
- the manufacturing method of the lining structure of a molten metal container which preheats the working surface of the said lining refractory before using the said molten metal container.
- the lining refractory before construction contains 50% by mass or more of the magnesia as periclase or calcined dolomite, In the preheating before use of the molten metal container, the molten metal container according to [1], wherein in the lining refractory before construction, a part of magnesia that is periclase or calcined dolomite is preheated until it is spineled with alumina.
- Method for manufacturing the lining structure of the present invention [3] A molten metal container lining structure manufactured by the method for manufacturing a molten metal container lining structure according to [1] or [2].
- the manufacturing method of the lining structure of the molten metal container which has sufficient fireproof performance, and the lining structure of a molten metal container which do not require the strong burner installation like the past can be provided. .
- FIG. 1 is a view showing a lining structure of a molten metal container according to an embodiment of the present invention.
- FIG. 2 is a diagram showing the relationship between the distance from the working surface of the lining refractory according to Invention Example 1 (with heat insulation) and Comparative Example 3 (without heat insulation) and the spinelization ratio of magnesia.
- the present invention uses a material that can spinel alumina and magnesia as the lining refractory after the lining refractory construction, while providing a heat insulating layer between the iron skin and the permanent refractory. It was discovered that by installing it, the refractory cost could be greatly reduced without deteriorating the equipment cost and energy cost, and it was completed.
- a heat insulating layer is provided on the iron skin side of the lining refractory.
- the ratio of spinel formation during preheating after construction is increased, and spinelization is further advanced to a sufficiently deep portion, so that the expansion associated with the progress of spinelization after the start of actual use, that is, after the operation of the lining refractory starts. It is possible to reduce cracks and suppress cracks. Thereby, the refractory cost can be greatly reduced without deteriorating the equipment cost and the energy cost.
- the back surface of the lining refractory refers to a surface opposite to the working surface, that is, the surface in contact with the molten metal.
- FIG. 1 is a view showing an example of a lining structure of a molten metal container according to an embodiment of the present invention.
- An iron skin 1 is provided on the outermost side of the molten metal container.
- the lining structure is in contact with molten metal (not shown) on the inner side, that is, on the right side of the drawing.
- the lining structure includes a heat insulating material 2, a permanent refractory material 3, and a lining refractory material 4 in order from the iron skin 1 to the inside, that is, in the direction in which molten metal enters (lining direction).
- the heat insulating material 2 has a heat transfer coefficient of 100 W / m 2 K or less.
- the heat transfer coefficient of the permanent refractory 3 is about 100 W / m 2 K.
- the heat transfer coefficient is a value obtained by dividing the thermal conductivity of each refractory layer such as the lining refractory 4, the permanent refractory 3, and the heat insulating material 2 by the thickness of each layer.
- the heat insulating material 2 As a heat insulating material having a heat transfer coefficient of 100 W / m 2 K or less, which is lower than that of the permanent refractory 3, the temperature gradient inside the lining refractory 4 is gradually reduced, In addition, the temperature up to the back surface can be increased, and spinelization of the lining refractory 4 can be sufficiently advanced by preheating before use. Since the heat insulating material 2 is generally porous and has low fire resistance, the heat insulating material 2 is provided between the iron shell 1 and the permanent refractory 3 in order to keep the temperature of the heat insulating material 2 low.
- the thermal conductivity of an inexpensive heat insulating material is about 0.3 W / mK. If such a heat insulating material is applied as the heat insulating material 2 and the construction thickness is 3 mm, the heat transfer coefficient is 100 W / m 2 K. For example, the construction thickness is doubled to 6 mm, the heat transfer coefficient is lowered to 50 W / m 2 K, or the heat conductivity is about 0.03 W / mK, although it is somewhat expensive, If the heat transfer coefficient can be lowered to 10 W / m 2 K, the effect of the present invention is further increased.
- the permanent refractory 3 is usually made of brick such as alumina and has a joint filled with mortar.
- the heat transfer coefficient of the permanent refractory 3 is about 100 W / m 2 K. Although illustrated as one layer in FIG. 1, two layers of the permanent refractory 3 may be provided.
- the lining refractory 4 is an unfired refractory and / or an amorphous refractory in which alumina and magnesia are spineled by sintering after application of the refractory, including alumina and magnesia.
- the “non-fired refractory” refers to a refractory that is not fired in advance after molding and before construction
- the “indefinite refractory” refers to a refractory that is not previously molded before construction.
- the lining refractory 4 is preferably composed of one or both of an unfired refractory and an amorphous refractory containing 60% by mass or more of alumina and 4% by mass or more of magnesia. More preferably, it is preferable that the lining refractory 4 contains 80% by mass or more of alumina and 5% by mass or more of magnesia except when graphite or the like is blended for a special application.
- the lining refractory 4 before spinelizing alumina and magnesia 50 mass% or more of magnesia is included in the refractory as periclase or baked dolomite.
- the ratio which turns into a spinel after construction can be made high, the effect which densifies the lining refractory 4 and improves corrosion resistance is acquired.
- it is more preferable that 90% by mass or more of magnesia is supplied as periclase.
- the unfired refractory and / or the amorphous refractory constituting the lining refractory 4 has a linear change rate at room temperature before and after heat treatment at 1500 ° C.
- line change after heat treatment at 1500 ° C. The rate is also adjusted to 0.8% or more.
- the linear change rate after heat treatment at 1500 ° C. to 0.8% or more, in the case of the lining structure including the heat insulating material 2 described above, after use as a molten metal container during preheating after refractory construction ( After operation), the effect of improving the corrosion resistance by densifying the lining refractory 4 by spineling of alumina and magnesia is obtained.
- the heat treatment temperature is set to 1500 ° C.
- the heat treatment time is set to 3 hours, considering the temperature history on the working surface side of the lining refractory 4 after use (after operation) as a molten metal container, and a lining by spinel formation. This is because the refractory 4 is used as an index of densification.
- the linear change rate at room temperature after heat treatment at 1500 ° C. is less than 0.8%, the effect of improving the corrosion resistance by densifying the lining refractory 4 even when the lining structure including the heat insulating material 2 is used. Is not enough.
- the lining structure that does not include the layer of the heat insulating material 2 if the linear change rate at room temperature after heat treatment at 1500 ° C.
- the linear change rate at room temperature after heat treatment at 1500 ° C. is 1.5% or more in order to improve the corrosion resistance by densifying the lining refractory 4.
- the linear change rate after heat treatment at 1500 ° C. is a method in which the positive value corresponds to expansion and the negative value corresponds to contraction, respectively, and the content of magnesia in the refractory to be contained in the refractory as periclase or baked dolomite is increased. And can be adjusted to decrease by a method such as increasing the content of titania, iron oxide, and silica contained in the refractory as impurities.
- a material containing 60% by mass of alumina and 4% by mass or more of magnesia can sufficiently exhibit the effect of improving corrosion resistance by spinelization. Can do.
- the effect of promoting the spinelization of the lining refractory 4 is a molten metal. Appears in the drying / preheating process of the lining refractory 4 before use of the container.
- the temperature of the working surface of the lining refractory 4 can be raised to 800 ° C. by providing the heat insulating material 2 having a heat transfer coefficient of 100 W / m 2 K or less on the back side of the lining refractory 4. In this case, spinelization of the lining refractory 4 in the vicinity of the working surface can be sufficiently advanced.
- the surface (working surface) temperature of the lining refractory at the end of the drying / preheating process is more preferably 900 to 1200 ° C.
- the inner refractory 4 is 91 mass% alumina-6 mass% magnesia, and 5/6 of magnesia (mass basis) is preliminarily blended as alumina-magnesia spinel at 1500 ° C.
- a cast amorphous refractory material having a linear change rate of 0.1% at room temperature after the heat treatment was used.
- the heat insulating sheet 2 was not constructed.
- the heat transfer coefficient of the permanent refractory 3 is 100 W / m 2 K. The lifetime was 225 heat.
- the infiltration depth of calcium oxide or silica, which is a slag component, into the refractory is as deep as 40 mm compared to the usual 30 mm, and cracks at the boundary was also recognized.
- Comparative Example 4 As the lining refractory 4, a non-cast refractory made of a material in which 94% by mass of alumina-3% by mass magnesia and 95% by mass or more of magnesia was blended as periclase was used. An insulation sheet was constructed. As a result, the life of the lining refractory 4 was longer than that of the conventional example but shorter than that of Comparative Example 3. This is because even when magnesia with a high periclase ratio is used, if the total amount of magnesia is less than 4% by mass, the linear change rate at room temperature after heat treatment at 1500 ° C. is as low as 0.7%, and the effect of densifying the refractory is sufficient.
- the life extension by changing the material of the lining refractory 4 is 11%, which is the extension of the life of the comparative example 3, and in addition to this, the life extension by providing a layer of the heat insulating material 2 is an example of the present invention. This is considered to be 22%, which is the difference in the extension of the lifetime between 1 and Comparative Example 3.
- FIG. 2 is a diagram showing the relationship between the distance from the working surface of the lining refractory and the magnesia spinelization ratio in Invention Example 1 (with heat insulating material) and Comparative Example 3 (without heat insulating material).
- the thickness of the lining refractory 4 is 130 mm.
- Example 1 of the present invention that has the heat insulating material 2
- the spinelization ratio is 24 to 30 points higher in each part, particularly in the central portion having a depth of 56 to 75 mm.
- the ratio was 35% with respect to 11%, and the ratio of spinelization was 3.2 times that of Comparative Example 3.
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Abstract
Description
[1] 外側に鉄皮、内側に内張り耐火物を有し、さらに鉄皮と内張り耐火物の間に永久張り耐火物とを有する溶融金属容器のライニング構造体の製造方法であって、
前記鉄皮と前記永久張り耐火物の間に、熱伝達係数が100W/m2K以下の断熱材を設け、
前記内張り耐火物として、アルミナ60質量%以上、及びマグネシア4質量%以上を含有し、かつ、1500℃で3時間熱処理した前後で室温での線変化率が0.8%以上である不焼成耐火物(unfired refractory)および/または不定形耐火物(unshaped refractory)を施工し、
前記溶融金属容器の使用前に、前記内張り耐火物の稼動面を予熱する、溶融金属容器のライニング構造体の製造方法。
[2] 施工前の前記内張り耐火物は、前記マグネシアの50質量%以上をペリクレース(periclase)または焼成ドロマイト(calcined dolomite)として含み、
前記溶融金属容器の使用前の予熱では、施工前の前記内張り耐火物において、ペリクレースまたは焼成ドロマイトであったマグネシアの一部が、アルミナとスピネル化するまで予熱する[1]に記載の溶融金属容器のライニング構造体の製造方法。
[3] [1]または[2]に記載の溶融金属容器のライニング構造体の製造方法によって製造された溶融金属容器のライニング構造体。
内張り耐火物4を構成する不焼成耐火物および/または不定形耐火物は、1500℃で3時間の熱処理の前と後での室温での線変化率(以下、1500℃の熱処理後の線変化率とも称する)を0.8%以上とするように調整する。1500℃の熱処理後の線変化率を0.8%以上とすることにより、前述した断熱材2を含むライニング構造体とした場合に、耐火物施工後の予熱時及び溶融金属容器として使用後(稼動後)に、アルミナとマグネシアのスピネル化によって内張り耐火物4を緻密化して耐食性を向上する効果が得られる。ここで、熱処理温度を1500℃、熱処理時間を3時間としたのは、溶融金属容器として使用後(稼動後)の内張り耐火物4の稼動面側の温度履歴を考慮して、スピネル化による内張り耐火物4の緻密化の指標とするためである。
また、1500℃の熱処理後の室温での線変化率が、0.8%未満では、断熱材2を含むライニング構造体とした場合においても、内張り耐火物4を緻密化して耐食性を向上する効果が十分に得られない。一方、断熱材2の層を含まないライニング構造体においては、1500℃の熱処理後の室温での線変化率を0.8%以上とすると、施工後の予熱時に低温でスピネル化する比率が低いために、内張り耐火物4の使用(稼動)初期にスピネル化による膨張が急激に進行するので、内張り耐火物4の使用開始後の急激な温度上昇時の熱膨張とスピネル化による膨張との合成膨張によって割れが生じて、スピネル化による耐火物の緻密化で耐食性が向上して耐火物寿命を延長する効果が十分に享受できなくなるおそれがある。
さらに、1500℃の熱処理後の室温での線変化率は1.5%以上とすることが、内張り耐火物4を緻密化して耐食性を向上するためにより望ましい。ここで、1500℃熱処理後の線変化率は、正値が膨張、負値が収縮にそれぞれ対応し、ペリクレースまたは焼成ドロマイトとして耐火物に含有させる耐火物のマグネシアの含有量を増加させる等の方法によって増加が可能であり、また、不純物等として耐火物中に含有されるチタニア、酸化鉄、シリカの含有量を増加させる等の方法によって減少するように調整できる。
(比較例4)内張り耐火物4として、94質量%アルミナ-3質量%マグネシアで、マグネシアの95質量%以上がペリクレースとして配合された材質の流し込み不定形耐火物を用い、比較例1と同様の断熱シートを施工した。この結果、内張り耐火物4の寿命が、従来例よりは長いが比較例3よりは短くなった。これは、ペリクレース比率の高いマグネシアを用いても、マグネシア総量が4質量%未満では1500℃の熱処理後の室温での線変化率が0.7%と低く、耐火物の緻密化の効果が十分得られないためと考えられた。
(比較例5)内張り耐火物4として、やや不純物の多いアルミナ原料を用い、90質量%アルミナ-6質量%マグネシアで、マグネシアの95質量%以上がペリクレースとして配合し、アルミナ原料から来る不純物(チタニア、酸化鉄、シリカ)が1質量%である、1500℃の熱処理後の線変化率が0.7%の材質の流し込み不定形耐火物を用い、比較例1と同様の断熱シートを施工した。この結果、内張り耐火物4の寿命が、従来例よりは長いが比較例3よりは短くなった。これは、ペリクレース比率の高いマグネシアを用いても、低融点の液相が生じやすい不純物の影響で1500℃の熱処理後の室温での線変化率が0.7%と低く、耐火物の緻密化の効果が十分得られないためと考えられた。
なお、他の比較例、従来例及び本発明例1で用いた内張り耐火物4では、アルミナ原料から来る不純物(チタニア、酸化鉄、シリカ)は0.5質量%であり、表1に示した何れの試験例においても、組成として示した数値の合計以外の残部は、マグネシア原料及びアルミナセメントから来るアルミナ及びマグネシア以外の不純物などの成分である。
2 断熱材
3 永久張り耐火物
4 内張り耐火物
Claims (3)
- 鉄皮側から順に、永久張り耐火物と、内張り耐火物とを有する溶融金属容器のライニング構造体の製造方法であって、
前記鉄皮と前記永久張り耐火物の間に、熱伝達係数が100W/m2K以下の断熱材を設け、
前記内張り耐火物として、アルミナ60質量%以上、及びマグネシア4質量%以上を含有し、かつ、1500℃で3時間熱処理した前後で室温での線変化率が0.8%以上である不焼成耐火物および/または不定形耐火物を施工し、
前記溶融金属容器の使用前に、前記内張り耐火物の稼動面を予熱する、溶融金属容器のライニング構造体の製造方法。 - 施工前の前記内張り耐火物は、前記マグネシアの50質量%以上をペリクレースまたは焼成ドロマイトを含み、
前記溶融金属容器の使用前の予熱では、施工前の前記内張り耐火物において、ペリクレースまたは焼成ドロマイトであったマグネシアの一部が、アルミナとスピネル化するまで予熱する請求項1に記載の溶融金属容器のライニング構造体の製造方法。 - 請求項1または2に記載の溶融金属容器のライニング構造体の製造方法によって製造されたライニング構造体。
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