WO2018147099A1 - Mud material for filling blast furnace tap hole - Google Patents
Mud material for filling blast furnace tap hole Download PDFInfo
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- WO2018147099A1 WO2018147099A1 PCT/JP2018/002538 JP2018002538W WO2018147099A1 WO 2018147099 A1 WO2018147099 A1 WO 2018147099A1 JP 2018002538 W JP2018002538 W JP 2018002538W WO 2018147099 A1 WO2018147099 A1 WO 2018147099A1
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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
- C21B7/12—Opening or sealing the tap holes
Definitions
- the present invention relates to a mud material for filling a blast furnace outlet hole.
- the blast furnace filling hole mud material (hereinafter also simply referred to as “mud material”) is a clay-like material that closes the pouring hole after the completion of the pouring in the blast furnace. Filled. With the recent increase in blast furnace size and high-pressure operation, the use environment for mud materials is becoming increasingly severe.
- the properties required for mud materials include wear resistance and corrosion resistance against slag and hot metal.
- a technique for improving wear resistance and corrosion resistance a mud material obtained by adding muscovite to a carbon raw material, a silicon carbide raw material, an alumina raw material, or the like is known (for example, see Patent Document 1).
- the mud material described in Patent Document 1 contains a large amount of carbon raw material (graphite, coke, etc.) (60 to 80% by weight in the mud material).
- carbon raw material graphite, coke, etc.
- Patent Document 1 muscovite reacts in a high temperature range of 900 ° C. or higher and contributes to improvement of the corrosion resistance (slag resistance) and strength of the mud material (page 2, lower right column, column 16). Line to page 3, upper left column, line 8), as a result of tests and examinations by the inventors of the present application, the mud material described in Patent Document 1 has sufficient adhesion to the tap hole (blast furnace wall). It has also been found that there is a problem of so-called hole breakage.
- the problem to be solved by the present invention is to provide a mud material that can improve adhesion while ensuring the wear resistance and corrosion resistance required for the mud material.
- the temperature in the central region in the longitudinal direction of the tap hole is about 600 to 1000 ° C. (hereinafter, this temperature region is referred to as “intermediate temperature region”), and sufficient expansion of the mud material in this intermediate temperature region is ensured. Is to do.
- the inventors of the present invention paid attention to wax stone as a raw material for the mud material, and further examined and examined its mineral composition.By using a wax stone containing an appropriate amount of mascobite, an intermediate temperature range was obtained. It has been found that sufficient expansion of the mud material can be secured.
- the following mud material is provided.
- a blast furnace mud filling mud material containing refractory materials In the refractory raw material, the content of mascobite as a mineral composition is 3% by mass or more and 9% by mass or less, containing 10% by mass or more and 50% by mass or less of a wax.
- the adhesiveness can be improved while ensuring the wear resistance and corrosion resistance of the mud material.
- the mud material of the present invention contains 10% by mass or more and 50% by mass or less of a rock stone having a mascobite content of 3% by mass or more and 9% by mass or less as a mineral composition in the refractory raw material.
- Rouseki contains pyroferrite, quartz, and the like as the main mineral composition.
- mascobite chemical composition is KAl 2 from the viewpoint of ensuring sufficient expansion of the mud material in the intermediate temperature range.
- a wax stone containing 3% by mass or more and 9% by mass or less of (a mineral represented by (Si 3 Al) O 10 (OH) 2 ) is used.
- the content of the mascobite in the wax is less than 3% by mass, the expansion of the mud material in the intermediate temperature range cannot be sufficiently ensured, and the adhesion cannot be improved.
- the content of mascobite in the wax is more than 9% by mass, the corrosion resistance is lowered because the melting point of mascobite is low (about 1250 ° C.).
- a preferable content of mascobite in the wax is 4% by mass or more and 7% by mass or less.
- the content of the wax stone in the refractory raw material is 10% by mass or more and 50% by mass or less.
- the content of the rock stone in the refractory raw material is less than 10% by mass, the effect of improving the adhesiveness by the rock stone (mascobite) cannot be sufficiently obtained.
- the content of the rock stone in the refractory raw material is more than 50% by mass, the corrosion resistance is lowered because the fire resistance of the rock stone is low.
- the preferable content of the wax in the refractory raw material is 15% by mass or more and 30% by mass or less.
- the content of the carbon raw material in the refractory raw material is 30% by mass or less (including 0). This is because if the content of the carbon raw material in the refractory raw material exceeds 30% by mass, the wear resistance and the corrosion resistance decrease.
- the content of the carbon raw material in the refractory raw material is preferably 15% by mass or less (including 0), and more preferably 5% by mass or less (including 0).
- examples of the carbon raw material include coke, graphite, anthracite, and the like.
- carbon black is excluded from the “carbon raw material”. This is because carbon black does not reduce wear resistance.
- the refractory materials can contain materials used in ordinary mud materials.
- materials used in ordinary mud materials For example, an alumina raw material, a silicon nitride raw material, a silicon carbide raw material, carbon black, clay, or the like can be appropriately contained.
- an appropriate amount of binder is added to the refractory raw material in the same manner as a normal mud material.
- the binder include tar, pitch, phenol resin and the like, and the addition amount is preferably about 10% by mass to 20% by mass with respect to the refractory raw material.
- a solvent such as creocoat is added to the binder.
- abrasion resistance abrasion resistance with respect to hot metal slag
- adhesiveness abrasion resistance with respect to hot metal slag
- “Mus content” means the content of mascobite in the wax.
- “Other raw materials” are silicon nitride raw materials, silicon carbide raw materials, carbon black and clay. Tar was used as the “binder”, and 15% by mass or 25% by mass was added to the refractory raw material.
- Abrasion resistance, corrosion resistance and adhesiveness were evaluated in the following manner, and comprehensive evaluation was performed based on these evaluation results.
- ⁇ Abrasion resistance> For each test piece obtained by pressure-molding the mud material of each example at 7 MPa and then baking at 500 ° C., the amount of wear was measured by the method specified in JIS R2252-1. A wear resistance index of 100 was determined. The smaller the wear resistance index, the better the wear resistance. In Table 1, a case where the wear resistance index is 120 or less is indicated as ⁇ (excellent), a case where it is over 120 and 140 or less is indicated as ⁇ (good), and a case where it is over 140 is indicated as ⁇ (defective).
- ⁇ Corrosion resistance> After pressure-molding the mud material of each example at 7 MPa, a test piece obtained by baking at 500 ° C. is lined in a high-frequency furnace using pig iron and blast furnace slag as an erodant, 1550 ° C. ⁇ 5 hours. An erosion test was performed. After the erosion test, the erosion dimension (maximum erosion site) of the test piece was measured, and the corrosion resistance index with the erosion dimension of Example 1 as 100 was determined. The smaller the corrosion resistance index, the better the corrosion resistance.
- the adhesive strength was measured by hollowing out the mud material in the carbon brick with Amsler.
- Table 1 the case where the adhesive strength is 2.5 MPa or more is indicated as ⁇ (excellent), the case where it is 1 MPa or more and less than 2.5 MPa is indicated as ⁇ (good), and the case where it is less than 1 MPa is indicated as x (defect).
- ⁇ Comprehensive evaluation> Abrasion resistance, corrosion resistance, and adhesion are all evaluated as ⁇ (excellent), ⁇ (excellent), ⁇ (excellent), or ⁇ (good) are evaluated, and ⁇ (defect) is not evaluated.
- the case where there were evaluations of “good” and “x” (defective) was defined as “x” (defective).
- Examples 1 to 9 within the scope of the present invention the overall evaluation was ⁇ (excellent) or ⁇ (good), and good results were obtained. That is, by making the content of the wax material and carbon material in the refractory raw material, and the content of mascobite in the rock stone within the scope of the present invention, while ensuring the wear resistance and corrosion resistance of the mud material, adhesion It was confirmed that it could be improved.
- Examples 1, 7, 8, and 9 in which the content of the wax stone and the carbon raw material in the refractory raw material and the content of the mascobite in the wax stone are within a preferable range are ⁇ (excellent) in overall evaluation, Especially good.
- Comparative Example 1 is an example in which the content of waxy stone in the refractory raw material is low, and the adhesiveness is lowered.
- the comparative example 2 is an example with much content of the wax in a refractory raw material, and corrosion resistance fell.
- Comparative Example 3 was an example in which the content of mascobite in the wax was low, and the adhesiveness was lowered.
- Comparative Example 4 was an example in which the content of mascobite in the wax was high, and the corrosion resistance was lowered.
- Comparative Example 5 is an example in which the content of the carbon raw material in the refractory raw material is large, and the wear resistance is lowered. In addition, since the content of the carbon raw material in the refractory raw material is large, the amount of the binder is increased, and the structure of the mud material becomes rough, so that the corrosion resistance is lowered.
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Abstract
The present invention provides a mud material with which adhesiveness can be improved while ensuring the wear resistance and corrosion resistance required of mud materials. The fireproofing material of this mud material contains 10 mass% to 50 mass% of agalmatolite, in which the content of the mineral composition muscovite is 3 mass% to 9 mass%, and the carbon material content in the fireproofing material is 30 mass% or less (including 0).
Description
本発明は、高炉出銑孔充填用マッド材に関する。
The present invention relates to a mud material for filling a blast furnace outlet hole.
高炉出銑孔充填用マッド材（以下、単に「マッド材」ともいう。）は、高炉において出銑終了後の出銑孔を閉塞する練り土状の材料であり、マッドガンを用いて出銑孔に充填される。近年の高炉の大型化や高圧操業によって、マッド材の使用環境は過酷化の一途をたどっている。
The blast furnace filling hole mud material (hereinafter also simply referred to as “mud material”) is a clay-like material that closes the pouring hole after the completion of the pouring in the blast furnace. Filled. With the recent increase in blast furnace size and high-pressure operation, the use environment for mud materials is becoming increasingly severe.
マッド材に要求される特性としては、耐摩耗性、スラグや溶銑に対する耐食性がある。耐摩耗性や耐食性を向上させる技術としては、炭素原料、炭化珪素原料、アルミナ原料等に白雲母を加えてなるマッド材が知られている（例えば、特許文献１参照）。
The properties required for mud materials include wear resistance and corrosion resistance against slag and hot metal. As a technique for improving wear resistance and corrosion resistance, a mud material obtained by adding muscovite to a carbon raw material, a silicon carbide raw material, an alumina raw material, or the like is known (for example, see Patent Document 1).
特許文献１に記載のマッド材は、炭素原料（黒鉛、コークス等）を多量（マッド材中に６０～８０重量％）含むものである。しかし、本願発明者らによる試験及び検討の結果、炭素原料が多量であるマッド材は、耐摩耗性及び耐食性に劣ることが判明した。
The mud material described in Patent Document 1 contains a large amount of carbon raw material (graphite, coke, etc.) (60 to 80% by weight in the mud material). However, as a result of tests and studies by the inventors of the present application, it has been found that a mud material containing a large amount of carbon raw material is inferior in wear resistance and corrosion resistance.
また、特許文献１によると、白雲母が９００℃以上の高温域で反応してマッド材の耐食性（耐スラグ性）及び強度の向上に寄与するとされているが（第２頁右下欄第１６行～第３頁左上欄第８行）、本願発明者らによる試験及び検討の結果、特許文献１に記載のマッド材は、出銑孔（高炉炉壁）との接着性が十分とはいえず、いわゆる孔切れが生じる問題があることも判明した。
Further, according to Patent Document 1, muscovite reacts in a high temperature range of 900 ° C. or higher and contributes to improvement of the corrosion resistance (slag resistance) and strength of the mud material (page 2, lower right column, column 16). Line to page 3, upper left column, line 8), as a result of tests and examinations by the inventors of the present application, the mud material described in Patent Document 1 has sufficient adhesion to the tap hole (blast furnace wall). It has also been found that there is a problem of so-called hole breakage.
そこで、本発明が解決しようとする課題は、マッド材に要求される耐摩耗性及び耐食性を確保しつつ、接着性を向上できるマッド材を提供することにある。
Therefore, the problem to be solved by the present invention is to provide a mud material that can improve adhesion while ensuring the wear resistance and corrosion resistance required for the mud material.
本願発明者らによる試験及び検討の結果、マッド材の接着性を向上するには出銑孔の長手方向中央領域でのマッド材の膨張を十分に確保することが重要であることが判明した。すなわち、出銑孔の長手方向中央領域の温度は６００～１０００℃程度（以下、この温度域を「中間温度域」という。）であり、この中間温度域でのマッド材の膨張を十分に確保するということである。この観点から本願発明者らはマッド材の原料として蝋石に着目し、さらにその鉱物組成に着目して試験及び検討を重ねたところ、マスコバイトを適量含有する蝋石を使用することで、中間温度域でのマッド材の膨張を十分に確保できることが判明した。
As a result of tests and examinations by the present inventors, it has been found that it is important to sufficiently ensure the expansion of the mud material in the central region in the longitudinal direction of the tap hole in order to improve the adhesiveness of the mud material. That is, the temperature in the central region in the longitudinal direction of the tap hole is about 600 to 1000 ° C. (hereinafter, this temperature region is referred to as “intermediate temperature region”), and sufficient expansion of the mud material in this intermediate temperature region is ensured. Is to do. From this point of view, the inventors of the present invention paid attention to wax stone as a raw material for the mud material, and further examined and examined its mineral composition.By using a wax stone containing an appropriate amount of mascobite, an intermediate temperature range was obtained. It has been found that sufficient expansion of the mud material can be secured.
すなわち、本発明の一観点によれば、次のマッド材が提供される。
「耐火原料を含む高炉出銑孔充填用マッド材であって、
耐火原料中に、鉱物組成としてのマスコバイトの含有量が３質量％以上９質量％以下である蝋石を１０質量％以上５０質量％以下含有し、
耐火原料中の炭素原料の含有量が３０質量％以下（０を含む。）である高炉出銑孔充填用マッド材。」 That is, according to one aspect of the present invention, the following mud material is provided.
"A blast furnace mud filling mud material containing refractory materials,
In the refractory raw material, the content of mascobite as a mineral composition is 3% by mass or more and 9% by mass or less, containing 10% by mass or more and 50% by mass or less of a wax.
A blast furnace outlet hole filling mud material in which the content of the carbon raw material in the refractory raw material is 30% by mass or less (including 0). "
「耐火原料を含む高炉出銑孔充填用マッド材であって、
耐火原料中に、鉱物組成としてのマスコバイトの含有量が３質量％以上９質量％以下である蝋石を１０質量％以上５０質量％以下含有し、
耐火原料中の炭素原料の含有量が３０質量％以下（０を含む。）である高炉出銑孔充填用マッド材。」 That is, according to one aspect of the present invention, the following mud material is provided.
"A blast furnace mud filling mud material containing refractory materials,
In the refractory raw material, the content of mascobite as a mineral composition is 3% by mass or more and 9% by mass or less, containing 10% by mass or more and 50% by mass or less of a wax.
A blast furnace outlet hole filling mud material in which the content of the carbon raw material in the refractory raw material is 30% by mass or less (including 0). "
本発明によれば、マッド材の耐摩耗性及び耐食性を確保しつつ、接着性を向上できる。
According to the present invention, the adhesiveness can be improved while ensuring the wear resistance and corrosion resistance of the mud material.
本発明のマッド材は、耐火原料中に、鉱物組成としてのマスコバイトの含有量が３質量％以上９質量％以下である蝋石を１０質量％以上５０質量％以下含有する。蝋石は、主要な鉱物組成としてパイロフェライト、石英等を含有するが、本発明では、上述のとおり中間温度域でのマッド材の膨張を十分に確保する点から、マスコバイト（化学組成がＫＡｌ２（Ｓｉ３Ａｌ）Ｏ１０（ＯＨ）２で表される鉱物）を３質量％以上９質量％以下含有する蝋石を使用する。蝋石中のマスコバイトの含有量が３質量％未満であると、中間温度域でのマッド材の膨張を十分に確保できず、接着性を向上することができない。一方、蝋石中のマスコバイトの含有量が９質量％超であると、マスコバイトの融点が低い（約１２５０℃）ため耐食性が低下する。蝋石中のマスコバイトの好ましい含有量は４質量％以上７質量％以下である。
The mud material of the present invention contains 10% by mass or more and 50% by mass or less of a rock stone having a mascobite content of 3% by mass or more and 9% by mass or less as a mineral composition in the refractory raw material. Rouseki contains pyroferrite, quartz, and the like as the main mineral composition. In the present invention, as described above, mascobite (chemical composition is KAl 2) from the viewpoint of ensuring sufficient expansion of the mud material in the intermediate temperature range. A wax stone containing 3% by mass or more and 9% by mass or less of (a mineral represented by (Si 3 Al) O 10 (OH) 2 ) is used. If the content of the mascobite in the wax is less than 3% by mass, the expansion of the mud material in the intermediate temperature range cannot be sufficiently ensured, and the adhesion cannot be improved. On the other hand, if the content of mascobite in the wax is more than 9% by mass, the corrosion resistance is lowered because the melting point of mascobite is low (about 1250 ° C.). A preferable content of mascobite in the wax is 4% by mass or more and 7% by mass or less.
また、耐火原料中の蝋石の含有量は１０質量％以上５０質量％以下とする。耐火原料中の蝋石の含有量が１０質量％未満であると、蝋石（マスコバイト）による接着性向上効果が十分には得られない。一方、耐火原料中に蝋石の含有量が５０質量％超であると、蝋石の耐火性が低いため耐食性が低下する。耐火原料中の蝋石の好ましい含有量は１５質量％以上３０質量％以下である。
In addition, the content of the wax stone in the refractory raw material is 10% by mass or more and 50% by mass or less. When the content of the rock stone in the refractory raw material is less than 10% by mass, the effect of improving the adhesiveness by the rock stone (mascobite) cannot be sufficiently obtained. On the other hand, if the content of the rock stone in the refractory raw material is more than 50% by mass, the corrosion resistance is lowered because the fire resistance of the rock stone is low. The preferable content of the wax in the refractory raw material is 15% by mass or more and 30% by mass or less.
本発明のマッド材において、耐火原料中の炭素原料の含有量は３０質量％以下（０を含む。）とする。耐火原料中の炭素原料の含有量が３０質量％を超えると、耐摩耗性及び耐食性が低下するからである。耐火原料中の炭素原料の含有量は１５質量％以下（０を含む。）であることが好ましく、５質量％以下（０を含む。）であることがより好ましい。ここで、炭素原料としてはコークス、黒鉛、無煙炭等が挙げられるが、本発明においてカーボンブラックは「炭素原料」から除かれるものとする。カーボンブラックは耐摩耗性を低下させないからである。
In the mud material of the present invention, the content of the carbon raw material in the refractory raw material is 30% by mass or less (including 0). This is because if the content of the carbon raw material in the refractory raw material exceeds 30% by mass, the wear resistance and the corrosion resistance decrease. The content of the carbon raw material in the refractory raw material is preferably 15% by mass or less (including 0), and more preferably 5% by mass or less (including 0). Here, examples of the carbon raw material include coke, graphite, anthracite, and the like. In the present invention, carbon black is excluded from the “carbon raw material”. This is because carbon black does not reduce wear resistance.
耐火原料中には上述の蝋石、炭素原料のほかに通常のマッド材に使用されている原料を含有することができる。例えば、アルミナ原料、窒化珪素原料、炭化珪素原料、カーボンブラック、粘土等を適宜含有することができる。そして、通常のマッド材と同様に耐火原料に適量の結合剤を添加する。結合剤としては、タール、ピッチ、フェノール樹脂等が挙げられ、その添加量は耐火原料に対して外掛けで１０質量％～２０質量％程度が好ましい。また、必要によっては結合剤に対し、例えばクレオコートなどの溶剤が添加される。
In addition to the above-mentioned wax stones and carbon materials, the refractory materials can contain materials used in ordinary mud materials. For example, an alumina raw material, a silicon nitride raw material, a silicon carbide raw material, carbon black, clay, or the like can be appropriately contained. Then, an appropriate amount of binder is added to the refractory raw material in the same manner as a normal mud material. Examples of the binder include tar, pitch, phenol resin and the like, and the addition amount is preferably about 10% by mass to 20% by mass with respect to the refractory raw material. If necessary, a solvent such as creocoat is added to the binder.
表１に示した各例のマッド材について、耐摩耗性、耐食性（溶銑スラグに対する耐食性）及び接着性を評価した。
なお、表１中、「Mus含有量」とは蝋石中のマスコバイトの含有量のことを意味する。「その他の原料」とは窒化珪素原料、炭化珪素原料、カーボンブラック及び粘土である。「結合剤」としてはタールを使用し、耐火原料に対して外掛けで１５質量％又は２５質量％添加した。 About the mud material of each example shown in Table 1, abrasion resistance, corrosion resistance (corrosion resistance with respect to hot metal slag), and adhesiveness were evaluated.
In Table 1, “Mus content” means the content of mascobite in the wax. “Other raw materials” are silicon nitride raw materials, silicon carbide raw materials, carbon black and clay. Tar was used as the “binder”, and 15% by mass or 25% by mass was added to the refractory raw material.
なお、表１中、「Mus含有量」とは蝋石中のマスコバイトの含有量のことを意味する。「その他の原料」とは窒化珪素原料、炭化珪素原料、カーボンブラック及び粘土である。「結合剤」としてはタールを使用し、耐火原料に対して外掛けで１５質量％又は２５質量％添加した。 About the mud material of each example shown in Table 1, abrasion resistance, corrosion resistance (corrosion resistance with respect to hot metal slag), and adhesiveness were evaluated.
In Table 1, “Mus content” means the content of mascobite in the wax. “Other raw materials” are silicon nitride raw materials, silicon carbide raw materials, carbon black and clay. Tar was used as the “binder”, and 15% by mass or 25% by mass was added to the refractory raw material.
耐摩耗性、耐食性及び接着性については以下の要領で評価し、これらの評価結果に基づき総合評価を行った。
＜耐摩耗性＞
各例のマッド材を７ＭＰａで加圧成形した後、５００℃加熱のベーキング処理を行って得た試験片について、ＪＩＳＲ２２５２－１に規定する方法で摩耗量を測定し、実施例１の摩耗量を１００とする耐摩耗性指数を求めた。この耐摩耗性指数が小さいほど耐摩耗性に優れていることを示す。表１では、耐摩耗性指数が１２０以下の場合を◎（優）、１２０超１４０以下の場合を○（良）、１４０超の場合を×（不良）と表記した。
＜耐食性＞
各例のマッド材を７ＭＰａで加圧成形した後、５００℃加熱のベーキング処理を行って得た試験片を、銑鉄及び高炉スラグを侵食剤とする高周波炉に内張りし、１５５０℃×５時間の侵食試験を行った。侵食試験後、試験片の溶損寸法（最大溶損部位）を測定し、実施例１の溶損寸法を１００とする耐食性指数を求めた。この耐食性指数が小さいほど耐食性に優れていることを示す。表１では、耐食性指数が１２０以下の場合を◎（優）、１２０超１４０以下の場合を○（良）、１４０超の場合を×（不良）と表記した。
＜接着性＞
高炉炉壁を想定したカーボンれんがの中心部にΦ５０×５０ｍｍの貫通孔を設け、この貫通孔部分に各例のマッド材をアムスラーで成形した後、上下を拘束し、５００℃加熱のベーキング処理を行った。その後、還元雰囲気で中間温度域を想定した１０００℃×３時間の焼成を行い、焼成後、常温でマッド材の接着強度を測定した。この接着強度の測定時には、アムスラーにてカーボンれんが内のマッド材をくり抜くようにして接着強度の測定を行った。表１では、接着強度が２．５ＭＰａ以上の場合を◎（優）、１ＭＰａ以上２．５ＭＰａ未満の場合を○（良）、１ＭＰａ未満の場合を×（不良）と表記した。
＜総合評価＞
耐摩耗性、耐食性及び接着性の評価が全て◎（優）の場合を◎（優）、◎（優）又は○（良）の評価があり、×（不良）の評価がない場合を○（良）、×（不良）の評価がある場合を×（不良）とした。 Abrasion resistance, corrosion resistance and adhesiveness were evaluated in the following manner, and comprehensive evaluation was performed based on these evaluation results.
<Abrasion resistance>
For each test piece obtained by pressure-molding the mud material of each example at 7 MPa and then baking at 500 ° C., the amount of wear was measured by the method specified in JIS R2252-1. A wear resistance index of 100 was determined. The smaller the wear resistance index, the better the wear resistance. In Table 1, a case where the wear resistance index is 120 or less is indicated as ◎ (excellent), a case where it is over 120 and 140 or less is indicated as ◯ (good), and a case where it is over 140 is indicated as × (defective).
<Corrosion resistance>
After pressure-molding the mud material of each example at 7 MPa, a test piece obtained by baking at 500 ° C. is lined in a high-frequency furnace using pig iron and blast furnace slag as an erodant, 1550 ° C. × 5 hours. An erosion test was performed. After the erosion test, the erosion dimension (maximum erosion site) of the test piece was measured, and the corrosion resistance index with the erosion dimension of Example 1 as 100 was determined. The smaller the corrosion resistance index, the better the corrosion resistance. In Table 1, a case where the corrosion resistance index is 120 or less is indicated as ◎ (excellent), a case where it is over 120 and 140 or less is indicated as ◯ (good), and a case where it is over 140 is indicated as × (poor).
<Adhesiveness>
A through hole of Φ50 × 50mm is provided in the center of the carbon brick assuming the blast furnace wall, and the mud material of each example is formed in this through hole part with Amsler, and the upper and lower sides are constrained, and baking treatment at 500 ° C. is performed. went. Thereafter, firing was performed at 1000 ° C. for 3 hours assuming an intermediate temperature range in a reducing atmosphere, and after firing, the adhesive strength of the mud material was measured at room temperature. At the time of measuring the adhesive strength, the adhesive strength was measured by hollowing out the mud material in the carbon brick with Amsler. In Table 1, the case where the adhesive strength is 2.5 MPa or more is indicated as ◎ (excellent), the case where it is 1 MPa or more and less than 2.5 MPa is indicated as ◯ (good), and the case where it is less than 1 MPa is indicated as x (defect).
<Comprehensive evaluation>
Abrasion resistance, corrosion resistance, and adhesion are all evaluated as ◎ (excellent), ◎ (excellent), ◎ (excellent), or ○ (good) are evaluated, and × (defect) is not evaluated. The case where there were evaluations of “good” and “x” (defective) was defined as “x” (defective).
＜耐摩耗性＞
各例のマッド材を７ＭＰａで加圧成形した後、５００℃加熱のベーキング処理を行って得た試験片について、ＪＩＳＲ２２５２－１に規定する方法で摩耗量を測定し、実施例１の摩耗量を１００とする耐摩耗性指数を求めた。この耐摩耗性指数が小さいほど耐摩耗性に優れていることを示す。表１では、耐摩耗性指数が１２０以下の場合を◎（優）、１２０超１４０以下の場合を○（良）、１４０超の場合を×（不良）と表記した。
＜耐食性＞
各例のマッド材を７ＭＰａで加圧成形した後、５００℃加熱のベーキング処理を行って得た試験片を、銑鉄及び高炉スラグを侵食剤とする高周波炉に内張りし、１５５０℃×５時間の侵食試験を行った。侵食試験後、試験片の溶損寸法（最大溶損部位）を測定し、実施例１の溶損寸法を１００とする耐食性指数を求めた。この耐食性指数が小さいほど耐食性に優れていることを示す。表１では、耐食性指数が１２０以下の場合を◎（優）、１２０超１４０以下の場合を○（良）、１４０超の場合を×（不良）と表記した。
＜接着性＞
高炉炉壁を想定したカーボンれんがの中心部にΦ５０×５０ｍｍの貫通孔を設け、この貫通孔部分に各例のマッド材をアムスラーで成形した後、上下を拘束し、５００℃加熱のベーキング処理を行った。その後、還元雰囲気で中間温度域を想定した１０００℃×３時間の焼成を行い、焼成後、常温でマッド材の接着強度を測定した。この接着強度の測定時には、アムスラーにてカーボンれんが内のマッド材をくり抜くようにして接着強度の測定を行った。表１では、接着強度が２．５ＭＰａ以上の場合を◎（優）、１ＭＰａ以上２．５ＭＰａ未満の場合を○（良）、１ＭＰａ未満の場合を×（不良）と表記した。
＜総合評価＞
耐摩耗性、耐食性及び接着性の評価が全て◎（優）の場合を◎（優）、◎（優）又は○（良）の評価があり、×（不良）の評価がない場合を○（良）、×（不良）の評価がある場合を×（不良）とした。 Abrasion resistance, corrosion resistance and adhesiveness were evaluated in the following manner, and comprehensive evaluation was performed based on these evaluation results.
<Abrasion resistance>
For each test piece obtained by pressure-molding the mud material of each example at 7 MPa and then baking at 500 ° C., the amount of wear was measured by the method specified in JIS R2252-1. A wear resistance index of 100 was determined. The smaller the wear resistance index, the better the wear resistance. In Table 1, a case where the wear resistance index is 120 or less is indicated as ◎ (excellent), a case where it is over 120 and 140 or less is indicated as ◯ (good), and a case where it is over 140 is indicated as × (defective).
<Corrosion resistance>
After pressure-molding the mud material of each example at 7 MPa, a test piece obtained by baking at 500 ° C. is lined in a high-frequency furnace using pig iron and blast furnace slag as an erodant, 1550 ° C. × 5 hours. An erosion test was performed. After the erosion test, the erosion dimension (maximum erosion site) of the test piece was measured, and the corrosion resistance index with the erosion dimension of Example 1 as 100 was determined. The smaller the corrosion resistance index, the better the corrosion resistance. In Table 1, a case where the corrosion resistance index is 120 or less is indicated as ◎ (excellent), a case where it is over 120 and 140 or less is indicated as ◯ (good), and a case where it is over 140 is indicated as × (poor).
<Adhesiveness>
A through hole of Φ50 × 50mm is provided in the center of the carbon brick assuming the blast furnace wall, and the mud material of each example is formed in this through hole part with Amsler, and the upper and lower sides are constrained, and baking treatment at 500 ° C. is performed. went. Thereafter, firing was performed at 1000 ° C. for 3 hours assuming an intermediate temperature range in a reducing atmosphere, and after firing, the adhesive strength of the mud material was measured at room temperature. At the time of measuring the adhesive strength, the adhesive strength was measured by hollowing out the mud material in the carbon brick with Amsler. In Table 1, the case where the adhesive strength is 2.5 MPa or more is indicated as ◎ (excellent), the case where it is 1 MPa or more and less than 2.5 MPa is indicated as ◯ (good), and the case where it is less than 1 MPa is indicated as x (defect).
<Comprehensive evaluation>
Abrasion resistance, corrosion resistance, and adhesion are all evaluated as ◎ (excellent), ◎ (excellent), ◎ (excellent), or ○ (good) are evaluated, and × (defect) is not evaluated. The case where there were evaluations of “good” and “x” (defective) was defined as “x” (defective).
表１に示すとおり、本発明の範囲内にある実施例１から９は、総合評価が◎（優）又は○（良）であり、良好な結果が得られた。すなわち、耐火原料中の蝋石及び炭素原料の含有量、並びに蝋石中のマスコバイトの含有量を本発明の範囲内とすることで、マッド材の耐摩耗性及び耐食性を確保しつつ、接着性を向上できることが確認された。なお、耐火原料中の蝋石及び炭素原料の含有量、並びに蝋石中のマスコバイトの含有量が好ましい範囲内にある実施例１、７、８、９は、総合評価が◎（優）であり、特に良好であった。
As shown in Table 1, in Examples 1 to 9 within the scope of the present invention, the overall evaluation was ◎ (excellent) or ◯ (good), and good results were obtained. That is, by making the content of the wax material and carbon material in the refractory raw material, and the content of mascobite in the rock stone within the scope of the present invention, while ensuring the wear resistance and corrosion resistance of the mud material, adhesion It was confirmed that it could be improved. In addition, Examples 1, 7, 8, and 9 in which the content of the wax stone and the carbon raw material in the refractory raw material and the content of the mascobite in the wax stone are within a preferable range are ◎ (excellent) in overall evaluation, Especially good.
これに対して、比較例１は耐火原料中の蝋石の含有量が少ない例で、接着性が低下した。
比較例２は耐火原料中の蝋石の含有量が多い例で、耐食性が低下した。
比較例３は蝋石中のマスコバイトの含有量が少ない例で、接着性が低下した。
比較例４は蝋石中のマスコバイトの含有量が多い例で、耐食性が低下した。
比較例５は耐火原料中の炭素原料の含有量が多い例で、耐摩耗性が低下した。加えて、耐火原料中の炭素原料の含有量が多いため、結合剤の量が増加し、マッド材の組織が粗になるため、耐食性が低下した。 On the other hand, Comparative Example 1 is an example in which the content of waxy stone in the refractory raw material is low, and the adhesiveness is lowered.
The comparative example 2 is an example with much content of the wax in a refractory raw material, and corrosion resistance fell.
Comparative Example 3 was an example in which the content of mascobite in the wax was low, and the adhesiveness was lowered.
Comparative Example 4 was an example in which the content of mascobite in the wax was high, and the corrosion resistance was lowered.
Comparative Example 5 is an example in which the content of the carbon raw material in the refractory raw material is large, and the wear resistance is lowered. In addition, since the content of the carbon raw material in the refractory raw material is large, the amount of the binder is increased, and the structure of the mud material becomes rough, so that the corrosion resistance is lowered.
比較例２は耐火原料中の蝋石の含有量が多い例で、耐食性が低下した。
比較例３は蝋石中のマスコバイトの含有量が少ない例で、接着性が低下した。
比較例４は蝋石中のマスコバイトの含有量が多い例で、耐食性が低下した。
比較例５は耐火原料中の炭素原料の含有量が多い例で、耐摩耗性が低下した。加えて、耐火原料中の炭素原料の含有量が多いため、結合剤の量が増加し、マッド材の組織が粗になるため、耐食性が低下した。 On the other hand, Comparative Example 1 is an example in which the content of waxy stone in the refractory raw material is low, and the adhesiveness is lowered.
The comparative example 2 is an example with much content of the wax in a refractory raw material, and corrosion resistance fell.
Comparative Example 3 was an example in which the content of mascobite in the wax was low, and the adhesiveness was lowered.
Comparative Example 4 was an example in which the content of mascobite in the wax was high, and the corrosion resistance was lowered.
Comparative Example 5 is an example in which the content of the carbon raw material in the refractory raw material is large, and the wear resistance is lowered. In addition, since the content of the carbon raw material in the refractory raw material is large, the amount of the binder is increased, and the structure of the mud material becomes rough, so that the corrosion resistance is lowered.
Claims (4)
- 耐火原料を含む高炉出銑孔充填用マッド材であって、
耐火原料中に、鉱物組成としてのマスコバイトの含有量が３質量％以上９質量％以下である蝋石を１０質量％以上５０質量％以下含有し、
耐火原料中の炭素原料の含有量が３０質量％以下（０を含む。）である高炉出銑孔充填用マッド材。 A blast furnace mud filling mud material containing a refractory material,
In the refractory raw material, the content of mascobite as a mineral composition is 3% by mass or more and 9% by mass or less, containing 10% by mass or more and 50% by mass or less of a wax.
A blast furnace outlet hole filling mud material in which the content of the carbon raw material in the refractory raw material is 30% by mass or less (including 0). - 前記蝋石中の前記マスコバイトの含有量が４質量％以上７質量％以下である請求項１に記載の高炉出銑孔充填用マッド材。 2. The blast furnace outlet filling mud material according to claim 1, wherein the content of the mascobite in the wax is 4% by mass or more and 7% by mass or less.
- 前記耐火原料中に、前記蝋石を１５質量％以上３０質量％以下含有する請求項１又は２に記載の高炉出銑孔充填用マッド材。 The blast furnace outlet filling mud material according to claim 1 or 2, wherein the refractory raw material contains 15% by mass to 30% by mass of the wax.
- 前記耐火原料中の前記炭素原料の含有量が１５質量％以下（０を含む。）である請求項１から３のいずれか一項に記載の高炉出銑孔充填用マッド材。 The blast furnace outlet filling mud material according to any one of claims 1 to 3, wherein the content of the carbon raw material in the refractory raw material is 15% by mass or less (including 0).
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| JP2017021377A JP6887724B2 (en) | 2017-02-08 | 2017-02-08 | Mud material for filling the tap hole of the blast furnace |
| JP2017-021377 | 2017-02-08 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6016873A (en) * | 1983-07-08 | 1985-01-28 | 坂井化学工業株式会社 | Heat resistant inorganic sealing agent for non-metal moldings |
| JPH01168804A (en) * | 1987-12-23 | 1989-07-04 | Kawasaki Refract Co Ltd | Plugging material for tapping hole in blast furnace |
| JP2004035284A (en) * | 2002-06-28 | 2004-02-05 | Kurosaki Harima Corp | Mud material for filling blast furnace tap hole |
| JP2006037126A (en) * | 2004-07-22 | 2006-02-09 | Kurosaki Harima Corp | Method for repairing tapping hole of blast furnace, and repairing material to be used therefor |
| JP2015168595A (en) * | 2014-03-06 | 2015-09-28 | 黒崎播磨株式会社 | Mud material |
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| US8163666B2 (en) * | 2006-10-20 | 2012-04-24 | Krosakiharima Corporation | Taphole mix |
| JP2009161888A (en) * | 2008-01-10 | 2009-07-23 | Mitsubishi Paper Mills Ltd | Coated paper for printing |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6016873A (en) * | 1983-07-08 | 1985-01-28 | 坂井化学工業株式会社 | Heat resistant inorganic sealing agent for non-metal moldings |
| JPH01168804A (en) * | 1987-12-23 | 1989-07-04 | Kawasaki Refract Co Ltd | Plugging material for tapping hole in blast furnace |
| JP2004035284A (en) * | 2002-06-28 | 2004-02-05 | Kurosaki Harima Corp | Mud material for filling blast furnace tap hole |
| JP2006037126A (en) * | 2004-07-22 | 2006-02-09 | Kurosaki Harima Corp | Method for repairing tapping hole of blast furnace, and repairing material to be used therefor |
| JP2015168595A (en) * | 2014-03-06 | 2015-09-28 | 黒崎播磨株式会社 | Mud material |
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