JP6887724B2 - Mud material for filling the tap hole of the blast furnace - Google Patents
Mud material for filling the tap hole of the blast furnace Download PDFInfo
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- JP6887724B2 JP6887724B2 JP2017021377A JP2017021377A JP6887724B2 JP 6887724 B2 JP6887724 B2 JP 6887724B2 JP 2017021377 A JP2017021377 A JP 2017021377A JP 2017021377 A JP2017021377 A JP 2017021377A JP 6887724 B2 JP6887724 B2 JP 6887724B2
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- 239000000463 material Substances 0.000 title claims description 45
- 239000002994 raw material Substances 0.000 claims description 51
- 229910052903 pyrophyllite Inorganic materials 0.000 claims description 26
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 18
- YGANSGVIUGARFR-UHFFFAOYSA-N dipotassium dioxosilane oxo(oxoalumanyloxy)alumane oxygen(2-) Chemical compound [O--].[K+].[K+].O=[Si]=O.O=[Al]O[Al]=O YGANSGVIUGARFR-UHFFFAOYSA-N 0.000 claims description 17
- 229910052627 muscovite Inorganic materials 0.000 claims description 17
- 229910052799 carbon Inorganic materials 0.000 claims description 16
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 6
- 239000011707 mineral Substances 0.000 claims description 6
- 230000009970 fire resistant effect Effects 0.000 claims description 4
- 239000003575 carbonaceous material Substances 0.000 claims description 2
- 238000005260 corrosion Methods 0.000 description 24
- 230000007797 corrosion Effects 0.000 description 24
- 238000011156 evaluation Methods 0.000 description 9
- 229910000805 Pig iron Inorganic materials 0.000 description 6
- 239000000853 adhesive Substances 0.000 description 6
- 230000001070 adhesive effect Effects 0.000 description 6
- 239000011230 binding agent Substances 0.000 description 6
- 230000003628 erosive effect Effects 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 239000006229 carbon black Substances 0.000 description 4
- 239000002893 slag Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 3
- 229910010271 silicon carbide Inorganic materials 0.000 description 3
- 229910052581 Si3N4 Inorganic materials 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 239000011449 brick Substances 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 2
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 1
- 239000003830 anthracite Substances 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- 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
-
- 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
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 tap hole in a blast furnace.
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 mud material for filling the pig iron hole in the blast furnace (hereinafter, also simply referred to as “mud material”) is a clay-like material that closes the pig iron hole after the pig iron in the blast furnace, and the pig iron hole is used with a mud gun. Is filled with. Due to the recent increase in size of blast furnaces and high-pressure operation, the environment in which mud materials are used is becoming harsher.
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 are wear resistance and corrosion resistance to 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 (see, for example, 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 materials (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 the 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, it is said that muscovite reacts in a high temperature range of 900 ° C. or higher and contributes to improvement of corrosion resistance (slag resistance) and strength of mud material (page 2, lower right column, No. 16). Lines to page 3, upper left column, line 8), as a result of tests and examinations by the inventors of the present application, it can be said that the mud material described in Patent Document 1 has sufficient adhesiveness to the pig iron hole (blast furnace wall). However, it was also found that there was a problem of so-called hole cutting.
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, an object to be solved by the present invention is to provide a mud material capable of improving adhesiveness while ensuring 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 studies by the inventors of the present application, it has been found that it is important to sufficiently secure the expansion of the mud material in the central region of the tap hole in the longitudinal direction in order to improve the adhesiveness of the mud material. That is, the temperature in the central region of the tap hole in the longitudinal direction is about 600 to 1000 ° C. (hereinafter, this temperature range is referred to as "intermediate temperature range"), and sufficient expansion of the mud material is ensured in this intermediate temperature range. Is to do. From this point of view, the inventors of the present application focused on pyrophyllite as a raw material for mud material, and further conducted tests and studies focusing on its mineral composition. It was found that the expansion of the mud material in the above can be sufficiently 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。
「主原料として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。）であり、
かつ、マッド材中のマスコバイトの含有量が０．５質量％以上２．６質量％以下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 materials are provided.
"A mud material for filling tap holes in a blast furnace that contains a fireproof raw material as the main raw material.
The fire-resistant raw material contains 10% by mass or more and 50% by mass or less of pyrophyllite having a content of muscovite as a mineral composition of 3% by mass or more and 9% by mass or less.
The content of the carbon material in the refractory raw material (including 0.) 30 wt% or less der is,
Moreover, the mud material for filling the tap hole of the blast furnace in which the content of muscovite in the mud material is 0.5% by mass or more and 2.6% by mass or less. "
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 pyrophyllite in which the content of muscovite as a mineral composition is 3% by mass or more and 9% by mass or less in the fireproof raw material. Rouseki contains pyroferrite, quartz, etc. as the main mineral composition, but in the present invention, as described above, mascovite (chemical composition is KAl 2) from the viewpoint of sufficiently ensuring the expansion of the mud material in the intermediate temperature range. Rouseki containing (Si 3 Al) O 10 (OH) 2 (mineral represented by 2) in an amount of 3% by mass or more and 9% by mass or less is used. If the content of muscovite in the pyrophyllite is less than 3% by mass, the mud material cannot be sufficiently expanded in the intermediate temperature range, and the adhesiveness cannot be improved. On the other hand, when the content of muscovite in pyrophyllite is more than 9% by mass, the melting point of muscovite is low (about 1250 ° C.), so that the corrosion resistance is lowered. The preferable content of muscovite in pyrophyllite 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。 The content of pyrophyllite in the fireproof raw material is 10% by mass or more and 50% by mass or less. If the content of pyrophyllite in the fireproof raw material is less than 10% by mass, the effect of improving the adhesiveness of the pyrophyllite (mascovite) cannot be sufficiently obtained. On the other hand, if the content of pyrophyllite in the refractory raw material is more than 50% by mass, the fire resistance of the pyrophyllite is low and the corrosion resistance is lowered. The preferable content of pyrophyllite in the fireproof 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 fireproof raw material is 30% by mass or less (including 0). This is because if the content of the carbon raw material in the fire-resistant raw material exceeds 30% by mass, the wear resistance and the corrosion resistance are lowered. The content of the carbon raw material in the fireproof 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, and anthracite, but 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 pyrophyllite and carbon raw materials, the fireproof raw materials can contain raw materials used for ordinary mud materials. For example, an alumina raw material, a silicon nitride raw material, a silicon carbide raw material, carbon black, clay and the like can be appropriately contained. Then, an appropriate amount of binder is added to the fireproof raw material in the same manner as the ordinary mud material. Examples of the binder include tar, pitch, and phenol resin, and the amount of the binder added is preferably about 10% by mass to 20% by mass with respect to the fireproof raw material. Further, if necessary, a solvent such as Cleocoat 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。
The wear resistance, corrosion resistance (corrosion resistance to hot metal slag) and adhesiveness of the mud materials of each example shown in Table 1 were evaluated.
In Table 1, "Mus content" means the content of muscovite in pyrophyllite. "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 externally to the fireproof 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 as follows, and a comprehensive evaluation was made based on these evaluation results.
<Abrasion resistance>
After the mud material of each example was pressure-molded at 7 MPa, the amount of wear of the test piece obtained by baking at 500 ° C. was measured by the method specified in JIS R2252-1, and the amount of wear of Example 1 was measured. The wear resistance index set to 100 was obtained. The smaller the wear resistance index, the better the wear resistance. In Table 1, the case where the wear resistance index is 120 or less is indicated by ⊚ (excellent), the case where the wear resistance index is more than 120 and 140 or less is indicated by ◯ (good), and the case where the wear resistance index is more than 140 is indicated as × (bad).
<Corrosion resistance>
The mud material of each example was pressure-molded at 7 MPa, and then the test piece obtained by baking at 500 ° C. was lined in a high-frequency furnace using pig iron and blast furnace slag as an erosion agent, and the temperature was 1550 ° C. for 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 obtained. The smaller the corrosion resistance index, the better the corrosion resistance. In Table 1, the case where the corrosion resistance index is 120 or less is indicated by ⊚ (excellent), the case where the corrosion resistance index is more than 120 and 140 or less is indicated by ◯ (good), and the case where the corrosion resistance index is more than 140 is indicated as × (poor).
<Adhesiveness>
A through hole of Φ50 × 50 mm is provided in the center of the carbon brick assuming the blast furnace wall, and after molding the mud material of each example with Amsler in this through hole, the upper and lower parts are restrained and the baking process is performed by heating at 500 ° C. went. Then, firing was performed in a reducing atmosphere at 1000 ° C. for 3 hours assuming an intermediate temperature range, 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 by ⊚ (excellent), the case where the adhesive strength is 1 MPa or more and less than 2.5 MPa is indicated by ◯ (good), and the case where the adhesive strength is less than 1 MPa is indicated as × (bad).
<Comprehensive evaluation>
If all the evaluations of wear resistance, corrosion resistance and adhesiveness are ◎ (excellent), there is an evaluation of ◎ (excellent), ◎ (excellent) or ○ (good), and if there is no evaluation of × (bad), ○ ( The cases where there were evaluations of good) and x (bad) were evaluated as x (bad).
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 keeping the content of pyrophyllite and carbon raw materials in the fire-resistant raw material and the content of muscovite in the pyrophyllite within the scope of the present invention, the adhesiveness can be maintained while ensuring the wear resistance and corrosion resistance of the mud material. It was confirmed that it could be improved. In Examples 1, 7, 8 and 9, in which the content of the pyrophyllite and carbon raw materials in the pyrophyllite and the content of muscovite in the pyrophyllite are within a preferable range, the overall evaluation is ⊚ (excellent). It was particularly 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 was an example in which the content of pyrophyllite in the fireproof raw material was small, and the adhesiveness was lowered.
Comparative Example 2 is an example in which the content of pyrophyllite in the fireproof raw material is high, and the corrosion resistance is lowered.
Comparative Example 3 is an example in which the content of muscovite in pyrophyllite is low, and the adhesiveness is lowered.
Comparative Example 4 is an example in which the content of muscovite in pyrophyllite is high, and the corrosion resistance is lowered.
Comparative Example 5 is an example in which the content of the carbon raw material in the fireproof raw material is large, and the wear resistance is lowered. In addition, since the content of the carbon raw material in the fireproof raw material is high, the amount of the binder is increased and the structure of the mud material is roughened, so that the corrosion resistance is lowered.
Claims (4)
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。）であり、
かつ、マッド材中のマスコバイトの含有量が０．５質量％以上２．６質量％以下である高炉出銑孔充填用マッド材。 A mud material for filling tap holes in a blast furnace that contains a fireproof raw material as the main raw material.
The fire-resistant raw material contains 10% by mass or more and 50% by mass or less of pyrophyllite having a content of muscovite as a mineral composition of 3% by mass or more and 9% by mass or less.
The content of the carbon material in the refractory raw material (including 0.) 30 wt% or less der is,
Moreover, the mud material for filling the tap hole of the blast furnace in which the content of muscovite in the mud material is 0.5% by mass or more and 2.6% by mass or less.
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| PCT/JP2018/002538 WO2018147099A1 (en) | 2017-02-08 | 2018-01-26 | Mud material for filling blast furnace tap hole |
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| JP2574681B2 (en) * | 1987-12-23 | 1997-01-22 | 川崎炉材株式会社 | Blast furnace taphole plugging material |
| JP4367824B2 (en) * | 2002-06-28 | 2009-11-18 | 黒崎播磨株式会社 | Mud material for filling blast furnace exit hole |
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| DE112007002497B4 (en) * | 2006-10-20 | 2014-07-10 | Krosakiharima Corp. | Taphole |
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