JP2922998B2 - Irregular refractories for blast furnace gutters - Google Patents
Irregular refractories for blast furnace guttersInfo
- Publication number
- JP2922998B2 JP2922998B2 JP2192298A JP19229890A JP2922998B2 JP 2922998 B2 JP2922998 B2 JP 2922998B2 JP 2192298 A JP2192298 A JP 2192298A JP 19229890 A JP19229890 A JP 19229890A JP 2922998 B2 JP2922998 B2 JP 2922998B2
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- Japan
- Prior art keywords
- weight
- raw material
- blast furnace
- silicon carbide
- temperature
- 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.)
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Description
【発明の詳細な説明】 産業上の利用分野 本発明は、高炉樋材用等の不定形耐火物に関する。Description: TECHNICAL FIELD The present invention relates to an amorphous refractory for blast furnace gutters and the like.
従来の技術 従来の高炉樋材は、炭化珪素質原料10〜20重量％、ア
ルミナ質原料50〜90重量％、カーボン質原料１〜５重量
％、シリカ質原料４〜10重量％と、これに金属アルミニ
ウム、金属シリコン、結合剤、分散剤を加えたものであ
った。2. Description of the Related Art Conventional blast furnace gutter materials are composed of 10 to 20% by weight of a silicon carbide material, 50 to 90% by weight of an alumina material, 1 to 5% by weight of a carbon material, and 4 to 10% by weight of a silica material. Metal aluminum, metal silicon, a binder, and a dispersant were added.
従来では高炉の出銑温度が1450℃〜1500℃の比較的低
い温度であったので、上記した高炉樋材が問題を生じる
ことなく使用できた。Conventionally, the tapping temperature of the blast furnace was a relatively low temperature of 1450 ° C to 1500 ° C, so that the above-mentioned blast furnace gutter could be used without any problem.
発明が解決しようとする課題 しかし、最近では、高炉の操業温度が1500℃〜1550℃
になり、高炉樋材のスラグラインの損耗が著しくなっ
た。損耗速度で比較すると、従来では、0.3mm/1000
t-Pig Ironだったものが、0.5mm/1000t-Pig Ironと倍位
になった。Problems to be Solved by the Invention However, recently, the operating temperature of the blast furnace has been increased from 1500 ° C to 1550 ° C.
And the slag line of the blast furnace gutter material was significantly worn. Compared to the wear rate, conventionally, 0.3 mm / 1000
what was t-Pig Iron is, it became a 0.5mm / 1000 t-Pig Iron and double position.
この現象を観察した結果、スラグラインの損耗メカニ
ズムは高温で粘性の下がったスラグが浸入し、マトリッ
クスがスラグに侵食されて洗い流されてしまうことがわ
かった。As a result of observing this phenomenon, it was found that the slag line was worn out at a high temperature and the matrix was eroded by the slag and washed away.
一般的に、スラグの浸透防止にはカーボン質原料や炭
化珪素質原料を増加すると効果的であり、高温で強度を
増加させるには金属シリコンとカーボンを添加すれば効
果がある。Generally, it is effective to increase the amount of carbonaceous material or silicon carbide material to prevent slag from penetrating, and to increase the strength at high temperatures, it is effective to add metallic silicon and carbon.
しかし、カーボン質や炭化珪素質原料を増加すると、
樋材の焼結状態が悪くなり、却って損耗が増大する結果
となることがあった。However, when carbon and silicon carbide raw materials are increased,
In some cases, the sintering state of the gutter material deteriorates, resulting in increased wear.
課題を解決するための手段 本発明は上記のような点に鑑みたもので、上記の課題
を解決するために、アルミナ質原料を10〜50重量％、炭
化珪素質原料を50〜80重量％、カーボン質原料を１〜３
重量％、金属アルミニウムを0.1〜1.5重量％、金属シリ
コンを0.5〜3.0重量％を含有するとともに、上記した炭
化珪素質原料とカーボン質原料の合計含有量に対して炭
化硼素を0.3〜12.0重量％を含有することを特徴とする
高炉樋材用等の不定形耐火物を提供するにある。Means for Solving the Problems The present invention has been made in view of the above points, and in order to solve the above problems, an alumina-based material is contained in an amount of 10 to 50% by weight, and a silicon carbide-based material is used in an amount of 50 to 80% by weight. , 1 to 3 carbonaceous raw materials
% Of metal, 0.1 to 1.5% by weight of metallic aluminum, 0.5 to 3.0% by weight of metallic silicon, and 0.3 to 12.0% by weight of boron carbide with respect to the total content of the above-mentioned silicon carbide raw material and carbon raw material. An object of the present invention is to provide an amorphous refractory for a blast furnace gutter material or the like, characterized by containing:
作 用 本発明の不定形耐火物を使用して高炉樋を施工する
と、アルミナ質原料を10〜50重量％とすることによって
高温での体積不定性がはかれるとともに、炭化珪素質原
料の50〜80重量％の含有によって出銑温度が1550度と高
温であっても高温に耐えられ、かつカーボン質原料の１
〜３重量％の含有によってスラグライン部にスラグが浸
透するのを抑制できる。そして、炭化硼素を0.3〜12.0
重量％含有していることによって、上記したアルミナ質
原料、炭化珪素質原料、カーボン質原料の酸化防止がは
かれるとともに、組織を緻密化して熱間での結合力を高
め、耐食性を改善できる。また、上記のように組織を緻
密化できるとともに、所定量の金属アルミニウムや金属
シリコンで乾燥昇熱時間の短縮化がはかれ、高温での耐
食性を低下させなくできる。When a blast furnace gutter is constructed using the amorphous refractory of the present invention, the volumetric irregularity at a high temperature is measured by setting the alumina raw material to 10 to 50% by weight, and the silicon carbide raw material of 50 to 80% is used. With the content of 1% by weight, it can withstand high temperatures even when the tapping temperature is as high as 1550 ° C, and is one of the carbonaceous raw materials.
The content of 浸透 3% by weight can suppress slag from penetrating into the slag line portion. And boron carbide is 0.3 ~ 12.0
By containing by weight, the above-mentioned alumina-based raw material, silicon carbide-based raw material, and carbon-based raw material can be prevented from being oxidized, and the structure can be densified to enhance the hot bonding force and improve the corrosion resistance. Further, the structure can be densified as described above, and the drying and heating time can be shortened with a predetermined amount of metal aluminum or metal silicon, so that the corrosion resistance at high temperatures can be prevented from lowering.
実施例 以下、本考案を実施例にもとづいて説明する。Embodiment Hereinafter, the present invention will be described based on an embodiment.
本発明の不定形耐火物は、アルミナ質原料を10〜50重
量％、炭化珪素質原料を50〜80重量％、カーボン質原料
を１〜３重量％、金属アルミニウムを0.1〜1.5重量％、
金属シリコンを0.5〜3.0重量％を含有するとともに、上
記した炭化珪素質原料とカーボン質原料の合計含有量に
対して炭化硼素を0.3〜12.0重量％を含有することを特
徴としている。The amorphous refractory of the present invention comprises 10 to 50% by weight of an alumina material, 50 to 80% by weight of a silicon carbide material, 1 to 3% by weight of a carbon material, 0.1 to 1.5% by weight of metallic aluminum,
It is characterized by containing 0.5 to 3.0% by weight of metallic silicon and 0.3 to 12.0% by weight of boron carbide based on the total content of the silicon carbide-based material and the carbonaceous material.
アルミナ質原料は、高温での体積安定性、耐スラグ性
に優れ、10〜50重量％配合するのが好ましい。しかし、
炭化珪素原料が50重量％以下では、高温に耐えられな
い。また、80重量％以上とすると、樋材を施工する時に
作業性が困難になる。The alumina raw material is excellent in volume stability at high temperature and slag resistance, and is preferably blended at 10 to 50% by weight. But,
If the silicon carbide raw material is 50% by weight or less, it cannot withstand high temperatures. On the other hand, when the content is 80% by weight or more, workability becomes difficult when the gutter material is constructed.
カーボン質原料は、耐スラグ浸透性に有効である。し
かし、カーボン質原料は３重量％以下がスラグ浸透防止
に効果があり、それ以上になると組織の焼結を阻害して
効果がなくなる。また１重量％以下となると、スラグ浸
透防止の効果が発揮できない。Carbonaceous raw materials are effective for slag penetration resistance. However, if the carbonaceous raw material is 3% by weight or less, it is effective in preventing slag penetration. If the content is less than 1% by weight, the effect of preventing slag penetration cannot be exhibited.
金属アルミニウムは、乾燥昇熱時の爆裂防止に有効で
ある。金属アルミニウムは昇熱時の耐爆裂性向上に必要
であるが、0.1重量％以下ではH2ガス発生量が少なくて
効果がない。また1.5重量％以上ではH2ガスが多量に発
生し、気孔の多い組織になって好ましくない。Metal aluminum is effective in preventing explosion during drying and heating. Although metallic aluminum is required for resistance to explosion improvement during Noborinetsu, no effect less H 2 gas generation amount is 0.1 wt% or less. If the content is 1.5% by weight or more, a large amount of H 2 gas is generated, and a structure having many pores is not preferable.
金属シリコンは、高温で上記したカーボン質原料と反
応して組織状のβ−SiCを形成し、熱間での結合力を増
加させるのに有効である。しかし、金属シリコンは、0.
5重量％以下では効果がなく、３重量％以上ではSiO2に
なってしまって、高温での耐食性を低下させるので好ま
しくない。Metallic silicon is effective for forming a textured β-SiC by reacting with the above-mentioned carbonaceous raw material at a high temperature and increasing the bonding force between heat. However, metallic silicon has a 0.
If it is less than 5% by weight, there is no effect, and if it is more than 3% by weight, it becomes SiO 2 , deteriorating the corrosion resistance at high temperatures, which is not preferable.
炭化硼素は、上記した炭化珪素質原料、カーボン質原
料の酸化の防止に有効であるとともに、熱間での結合力
を増加させる。これは、炭化硼素（一般にB4Cをいう）
が、2C＋O2→2CO、B4C＋6CO→2B2O3＋7Cの反応が生じる
ものと考えられる。空気中やスラグ中から浸入した酸素
は、すぐにカーボンと反応して前者の反応が生じ、COガ
スになる。このCOガスがB4Cと反応し、後者の反応が生
じてB2O2の液相を生成する。このB2O3の液相焼結によっ
てSiCの焼結が助長されて緻密な組織となり、熱間強度
を向上しているものと思われる。炭化硼素は、炭化珪素
質原料とカーボン質原料との合計含有量に対して0.3重
量％以下では効果がなく、12.0重量％以上となると余分
なB2O3が組織を軟化させ、高温での強度を低下させるの
で好ましくない。Boron carbide is effective in preventing the oxidation of the above-mentioned silicon carbide-based raw material and carbon-based raw material, and also increases the bonding force between heat. This is boron carbide (generally B 4 C)
However, it is considered that a reaction of 2C + O 2 → 2CO and B 4 C + 6CO → 2B 2 O 3 + 7C occurs. Oxygen that has penetrated from the air or slag immediately reacts with carbon to cause the former reaction to become CO gas. This CO gas reacts with B 4 C, and the latter reaction occurs to generate a B 2 O 2 liquid phase. It is considered that the liquid phase sintering of B 2 O 3 promotes the sintering of SiC to form a dense structure, thereby improving the hot strength. Boron carbide has no effect when the content is less than 0.3% by weight with respect to the total content of the silicon carbide-based material and the carbonaceous material, and when it exceeds 12.0% by weight, excess B 2 O 3 softens the structure, It is not preferable because the strength is reduced.
以上の配合の他に、例えばシリカ質原料、スピネル質
原料、塩基性原料等の樋材として耐用するものを充当す
ることができる。In addition to the above-mentioned composition, for example, a material which can be used as a gutter material such as a silica material, a spinel material, and a basic material can be used.
また、シリカ質原料は、700〜1000℃の中間温度域で
の熱間強度を向上させるのに有効である。特に、シリカ
質原料で粒径１μ以下の粒子が90％以上のものを炭化珪
素質原料とカーボン質原料の合計含有量に対して1.4重
量％以下の量で併用すると、緻密な組織が得られて好ま
しい。しかし、1.4重量％以上添加すると、高温におけ
る耐食性が著しく劣ってよい効果が得られない。Further, the siliceous raw material is effective for improving the hot strength in an intermediate temperature range of 700 to 1000 ° C. In particular, when a siliceous raw material having 90% or more of particles having a particle diameter of 1 μm or less is used together in an amount of 1.4% by weight or less based on the total content of the silicon carbide raw material and the carbonaceous raw material, a dense structure can be obtained. Preferred. However, if added in an amount of 1.4% by weight or more, the corrosion resistance at high temperatures is remarkably inferior, and no good effect can be obtained.
配合例と使用例 上表に、本発明のいろいろな実施品の配合例を従来品
と比較している。本発明の実施品は、上記した配合比に
もとづいている。なお、結合剤としては、たとえは、ヘ
キサメタリン酸ソーダ、分散剤としては、たとえばカル
シウムアルミネートが使用できる。Formulation examples and usage examples In the above table, examples of blending of various working products of the present invention are compared with conventional products. The product of the present invention is based on the above-mentioned compounding ratio. As the binder, for example, sodium hexametaphosphate can be used, and as the dispersant, for example, calcium aluminate can be used.
上表の本発明のNo.1に示した配合のものについて、Ａ
製鉄所の高炉樋に施工した。施工条件としては、気温20
℃、水温22℃、施工量20トン、施工水量6.5重量％で流
し込み施工した。その結果、上記したように不定形耐火
物の組織の強度が非常に大きくなり、乾燥昇熱時の水蒸
気圧に、より耐えられるようになったので、従来36時間
かかっていたものが、10時間で使用温度まで昇熱するこ
とができ、乾燥昇熱時間を大幅に短縮することができ
た。For the composition shown in No. 1 of the present invention in the above table, A
It was constructed on a blast furnace gutter of a steelworks. The construction conditions are as follows: temperature 20
C., water temperature 22 ° C., construction volume 20 tons, construction water volume 6.5% by weight. As a result, as described above, the strength of the structure of the amorphous refractory became extremely large, and it became possible to withstand the steam pressure during the drying and heating. Thus, the temperature could be raised to the use temperature, and the drying and heating time could be significantly reduced.
また、操業温度を1550℃として、20日間使用したとこ
ろ、樋材の損耗速度は0.2mm/1000t-pig Ironとなって、
従来に比して50％以上改善できた。In addition, when the operating temperature was 1550 ° C and used for 20 days, the wear rate of the gutter material was 0.2 mm / 1000 t-pig Iron ,
It has been improved by more than 50% compared to the past.
上記では、本発明の不定形耐火物を高炉樋用について
説明したが、高温操業の他の耐火壁や溶融金属容器の内
張り、その他にも適用できる。In the above description, the amorphous refractory of the present invention is used for blast furnace gutters, but it can be applied to other refractory walls for high-temperature operation, lining of molten metal containers, and the like.
発明の効果 以上のように本発明にあっては、高温での体積安定性
をはかれ、組織を緻密化できて流し込み施工の乾燥昇熱
時間を大幅に短縮することができるとともに、特に1550
度での高温操業に対して耐食性を向上でき、さらにスラ
グライン部でのスラグの浸透も抑制できて耐火壁等の耐
久性を一段と向上することができる。また、含有する炭
化硼素によって、含有するアルミナ質原料、炭化珪素質
原料とカーボン質原料の酸化防止がはかれるとともに、
組織を緻密化して熱間での結合力を高め耐食性を改善で
き、所定量の金属アルミニウムや金属シリコンで乾燥昇
熱時間の短縮化がはかれて、高温での耐食性を低下させ
なくできる。Advantageous Effects of the Invention As described above, in the present invention, the volume stability at high temperature can be obtained, the structure can be densified, and the drying and heating time of casting can be significantly reduced, and in particular, 1550
Corrosion resistance to high-temperature operation at a high temperature can be improved, and slag penetration in the slag line can be suppressed, so that the durability of fire-resistant walls and the like can be further improved. Also, the contained boron carbide prevents oxidation of the contained alumina raw material, silicon carbide raw material and carbon raw material,
The structure can be densified to increase the hot bonding force to improve the corrosion resistance, and the predetermined amount of metallic aluminum or metallic silicon can shorten the drying and heating time, thereby preventing the corrosion resistance at high temperatures from being reduced.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 鳥谷 恭信 兵庫県赤穂市中広字東沖1576番地の２ 川崎炉材株式会社内 (72)発明者 佐藤 健一 兵庫県赤穂市中広字東沖1576番地の２ 川崎炉材株式会社内 (72)発明者 寒川 郁彦 兵庫県赤穂市中広字東沖1576番地の２ 川崎炉材株式会社内 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Yasunobu Toriya 1576 east off Nakahirohiro, Ako City, Hyogo Prefecture 2 Inside Kawasaki Furnace Materials Co., Ltd. 1576-2 Kawasaki Furnace Materials Co., Ltd. (72) Inventor Ikuhiko Samukawa 1576-2 Kawasaki Furnace Materials Co., Ltd.
Claims (1)
質原料を50〜80重量％、カーボン質原料を１〜３重量
％、金属アルミニウムを0.1〜1.5重量％、金属シリコン
を0.5〜3.0重量％を含有するとともに、 上記した炭化珪素質原料とカーボン質原料の合計含有量
に対して炭化硼素を0.3〜12.0重量％を含有することを
特徴とする高炉樋材用等の不定形耐火物。1. An alumina raw material of 10 to 50% by weight, a silicon carbide raw material of 50 to 80% by weight, a carbonaceous raw material of 1 to 3% by weight, metallic aluminum of 0.1 to 1.5% by weight, metallic silicon of 0.5 to 0.5%. Characterized by containing 0.3 to 12.0% by weight of boron carbide with respect to the total content of the above-mentioned silicon carbide-based material and carbonaceous material in addition to 3.0% by weight. Stuff.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2192298A JP2922998B2 (en) | 1990-07-19 | 1990-07-19 | Irregular refractories for blast furnace gutters |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2192298A JP2922998B2 (en) | 1990-07-19 | 1990-07-19 | Irregular refractories for blast furnace gutters |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0477368A JPH0477368A (en) | 1992-03-11 |
| JP2922998B2 true JP2922998B2 (en) | 1999-07-26 |
Family
ID=16288950
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2192298A Expired - Fee Related JP2922998B2 (en) | 1990-07-19 | 1990-07-19 | Irregular refractories for blast furnace gutters |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2922998B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6077877B2 (en) * | 2013-02-13 | 2017-02-08 | 黒崎播磨株式会社 | Castable refractories for blast furnace firewood |
-
1990
- 1990-07-19 JP JP2192298A patent/JP2922998B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0477368A (en) | 1992-03-11 |
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