JPH0489362A - Castable refractory for lining blast furnace ladle for pretreating molten pig iron - Google Patents
Castable refractory for lining blast furnace ladle for pretreating molten pig ironInfo
- Publication number
- JPH0489362A JPH0489362A JP2203629A JP20362990A JPH0489362A JP H0489362 A JPH0489362 A JP H0489362A JP 2203629 A JP2203629 A JP 2203629A JP 20362990 A JP20362990 A JP 20362990A JP H0489362 A JPH0489362 A JP H0489362A
- Authority
- JP
- Japan
- Prior art keywords
- blast furnace
- particle size
- pig iron
- castable refractory
- molten pig
- 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.)
- Granted
Links
- 229910000805 Pig iron Inorganic materials 0.000 title 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000002245 particle Substances 0.000 claims abstract description 11
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract description 11
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 9
- 239000010439 graphite Substances 0.000 claims abstract description 9
- 239000002184 metal Substances 0.000 claims description 12
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 239000004575 stone Substances 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 2
- 230000007797 corrosion Effects 0.000 abstract description 11
- 238000005260 corrosion Methods 0.000 abstract description 11
- 238000004901 spalling Methods 0.000 abstract description 7
- 229910052903 pyrophyllite Inorganic materials 0.000 abstract 2
- 239000007858 starting material Substances 0.000 abstract 2
- 238000002156 mixing Methods 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 6
- 239000011449 brick Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- 239000002893 slag Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000008595 infiltration Effects 0.000 description 3
- 238000001764 infiltration Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000003518 caustics Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 150000001639 boron compounds Chemical class 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Landscapes
- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Ceramic Products (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、高炉から出銑した溶銑を移送し、且つ溶銑を
予備処理する高炉鍋に使用される高炉鍋用ライニングキ
ャスタブルに関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a lining castable for a blast furnace ladle used in a blast furnace ladle for transporting hot metal tapped from a blast furnace and for pre-treating the hot metal.
従来の技術
昨今、クリーンスチールの要求に伴い高炉鍋で脱Ｓ、脱
Ｓｉ、脱Ｐ等いわゆる溶銑の予備処理が行われ年々その
処理比率が向上し、内張り耐火物に対しその使用条件は
苛酷化してきている。従来より内張り材としては主とし
てロー石煉瓦で築造されてきたが、耐蝕性が不満足なも
のとなり、処理剤であるＣａ０−ＣａＦ、−ＦｅＯ系フ
ランクスに対し高耐蝕性を示すＡ１１ｚＯｓ ＳｉＣ
Ｃ質煉瓦が使用されてきている。Conventional technology Recently, in response to the demand for clean steel, so-called preliminary treatment of hot metal, such as de-S, de-Si, de-P, etc., is carried out in blast furnace ladle, and the treatment ratio is increasing year by year, and the conditions of use for lined refractories are becoming more severe. I've been doing it. Conventionally, the lining material has been mainly made of low stone bricks, but its corrosion resistance is unsatisfactory, and A11zOs SiC, which has high corrosion resistance against Ca0-CaF and -FeO-based Franks treatment agents, has been used for construction.
C-grade bricks have been used.
発明が解決しようとする課題
高炉鍋は、高炉にて１５００℃以上の溶銑を受銑し転炉
への移送に用いられ、Ｃａ０−ＣａＦ。Problems to be Solved by the Invention A blast furnace ladle is used to receive hot metal at a temperature of 1500°C or higher in a blast furnace and transfer it to a converter.
ＦｅＯ系フラックスを処理剤とした溶銑の予備処理はこ
の移送途中に行われている。溜場時間は概略３ｈｒｓ／
回で１．５〜２回／日の割合で使用され、溶銑排出後は
鍋内雰囲気温度は５００℃程度まで低下する。煉瓦で築
造される高炉鍋の持つ問題として、目地からの溶損、地
金浸潤、又煉瓦使用上の煉瓦割り付けや築造時間に長時
間を有することや熟練した築炉玉不足等が挙げられる。Preliminary treatment of the hot metal using FeO-based flux as a treatment agent is performed during this transfer. The storage time is approximately 3hrs/
It is used 1.5 to 2 times per day, and after the hot metal is discharged, the atmospheric temperature inside the pot drops to about 500°C. Problems with blast furnace pots constructed with bricks include melting from the joints, infiltration of base metal, long brick allocation and construction times, and a lack of skilled bricklayers.
発明者らは目地が無く、施工者の熟練度に左右されずに
築造できるキャスタブルに着目した。The inventors focused on a castable structure that has no joints and can be constructed regardless of the skill level of the builder.
この様な条件下で使用される高炉鍋用ライニングキャス
タブルの必要特性は、流動性が良く施工でき収縮亀裂の
発生しないこと、Ｃａ０−（：、ａＦｚＦｅＯ系フラン
クスへの耐蝕性ならびに１５００℃から５００℃への繰
り返し受ける熱衝撃に対し高い抵抗性を示すことにある
。The required characteristics of lining castable for blast furnace pots used under such conditions are good fluidity, ease of construction, no shrinkage cracks, corrosion resistance to Ca0-(:, aFzFeO-based franks, and resistance between 1500°C and 500°C). The objective is to show high resistance to repeated thermal shocks.
課題を解決するための手段
上記目的を達成するため、本発明はアルミナ賞原料を主
組成とし、粒度０．０７４ｍｍ以下の炭化珪素５〜１０
ｗｔ％２粒度６〜１ｍｍのロー石５〜１０ｗｔ％と粒度
４〜１ｍｍの黒鉛を５〜１５ｗｔ％配合した溶銑予備処
理用高炉鍋ライニングキャスタブルを提供するものであ
る。Means for Solving the Problems In order to achieve the above-mentioned objects, the present invention mainly consists of an alumina prize raw material and contains 5 to 10 silicon carbide particles with a particle size of 0.074 mm or less.
The present invention provides a blast furnace ladle lining castable for hot metal pretreatment, which contains 5 to 10 wt % of low stone with a grain size of 6 to 1 mm and 5 to 15 wt % of graphite with a grain size of 4 to 1 mm.
即ち、本発明において、溶銑溶滓に対する耐蝕性とスラ
グ、メタル浸潤による剥離等を解消するためには炭化珪
素、黒鉛、カーボンおよび硬ピンチ等の微粉を活用した
。ただ黒鉛、カーボン、硬ピンチの微粉は、キャスタブ
ルとして流動性低下。That is, in the present invention, fine powders of silicon carbide, graphite, carbon, hard pinch, etc. are utilized in order to provide corrosion resistance to hot metal slag and eliminate peeling caused by slag and metal infiltration. However, fine powders such as graphite, carbon, and hard pinch powders have low fluidity as they are castable.
水量増の要因となり多量に活用できない。従って炭化珪
素にその効果を求めた。第１表（１）に示す電融アルミ
ナを骨材とした配合で、微粉０．０７４ｍｍ以下の部へ
粒度０．０７４ｍｍ以下の５ｉＣ（品位９２％）を２．
５ ｗ ｔ％、５ｗｔ％、１０ｗｔ％、１５ｗｔ％、
２Ｑｗｔ％と置換したキャスタブルを回転侵蝕炉に内
張すし、侵蝕剤としてＣａ０４０％、ＣａＦｚ １０
％ミルスケール５０％の混合物を投入溶融させ１５００
℃Ｘ６ｈｒｓ侵蝕テストを行った。結果を第１図に示す
。この結果から、このフラフクスに対してはＳｉＣ添加
量は５〜１０ｗｔ％が適量であることを見出した。This causes an increase in water volume and cannot be used in large quantities. Therefore, we sought this effect from silicon carbide. With the composition of fused alumina shown in Table 1 (1) as an aggregate, 2.
5 wt%, 5wt%, 10wt%, 15wt%,
A rotary erosion furnace was lined with castable substituted with 2Qwt%, and Ca040% and CaFz10 were added as corrosive agents.
% mill scale 50% mixture was added and melted to 1500
C. x 6 hrs erosion test was conducted. The results are shown in Figure 1. From this result, it was found that the appropriate amount of SiC to be added to this fluffx was 5 to 10 wt%.
１５ｗｔ％以上では変質層は形成されないものの侵蝕厚
みが大きく、５ｗｔ％未満では逆に侵蝕厚みは小さいも
のの変質層が形成され構造的スポールによる剥離が懸念
される。即ち、浸透防止、耐蝕性のバランスのとれる領
域として５ｉＣ５〜１０ｗｔ％が適量であることを見出
した。If it is 15 wt% or more, no altered layer will be formed, but the eroded thickness will be large; if it is less than 5 wt%, the eroded thickness will be small, but an altered layer will be formed, and peeling due to structural spalls may occur. That is, it has been found that 5 to 10 wt % of 5iC is an appropriate amount as a balance between penetration prevention and corrosion resistance.
次に、ロー石粒度６〜１ｍｍを５〜１０ｗｔ％としたの
は、材料に残存膨張性を持たせ、収縮亀裂を防止するた
めのもので、５ｗｔ％未満では効果が得られず、ｌ Ｑ
ｗ ｔ％超では耐蝕性的に問題が生じるためである。Next, the reason why the lowite grain size is 6 to 1 mm is set to 5 to 10 wt% is to give the material residual expansibility and prevent shrinkage cracks, and if it is less than 5 wt%, no effect can be obtained.
This is because if it exceeds wt%, a problem will arise in terms of corrosion resistance.
第１表（３）に示す配合において、電融アルミナ粒度６
〜１ｍｍ部に、ロー石粒度６〜１ｍｍを’ｌ、 ５ ｗ
ｔ％、５ｗｔ％、１０ｗｔ％、１５ｗｔ％と置換し、
１４００℃ｘ３ｈｒｓ焼成した後の線変化率ならびに前
記と同様Ｃａ０−ＣａＦｚミルスケールを侵蝕剤とした
回転侵蝕テスト結果を第２表に示す。In the formulation shown in Table 1 (3), fused alumina particle size 6
~1mm section, add low stone grain size 6~1mm, 5w
Replaced with t%, 5wt%, 10wt%, 15wt%,
Table 2 shows the linear change rate after firing at 1400° C. for 3 hours and the results of the rotary corrosion test using Ca0-CaFz mill scale as the corrosive agent as described above.
最後に黒鉛粒度４〜１ｍｍ５〜１５ｗｔ％としたのは、
キャスタブルの熱的スポール性を向上維持させるための
もので、５ｗｔ％未満ではその効果がみられず、１５ｗ
ｔ％超ではキャスタブルとしての流動性が得難（、混線
水量の増加で見掛気孔率が増大し粗な成型体となるため
である。黒鉛は耐スポール性に優れ、溶銑スラグに対す
る抵抗性、ならびにスラグ、メタル浸潤による剥離等を
解消する有用な特性を持つ一方、水への分散能に欠はキ
ャスタブルとして必要な流動性を得るためには混練水量
は増加する。従って、主に耐スポール性の向上を目的に
粗粒にて検討したものである。Finally, the graphite particle size was set to 4 to 1 mm and 5 to 15 wt%.
This is to improve and maintain the thermal spalling property of castable, and the effect is not seen at less than 5wt%, and 15w
If it exceeds t%, it is difficult to obtain the fluidity as a castable (because the apparent porosity increases due to the increase in the amount of mixed water, resulting in a rough molded product. Graphite has excellent spalling resistance, resistance to hot metal slag, It also has the useful property of eliminating peeling caused by slag and metal infiltration, but it lacks dispersibility in water, and the amount of kneading water increases in order to obtain the fluidity required for castable. This study was carried out using coarse grains with the aim of improving the
第２表（３）に示す配合において、電融アルミナ粒度６
〜１ｍｍ部に黒鉛粒度４〜１ｍｍを２．５ ｗ ｔ％、
５ｗｔ％、１０ｗｔ％、１５ｗｔ％、２０ｗｔ％置換し
、酸化防止剤とし硼素化合物１％を添加した材料の流し
込み成形後１１０℃×２４ｈｒｓ乾燥後の見掛気孔率な
らびに１４００°Ｃスポール試験結果を第３表に示す。In the formulation shown in Table 2 (3), fused alumina particle size 6
2.5 wt% of graphite particle size 4-1 mm in ~1 mm part,
The apparent porosity and 1400°C spall test results after casting and drying at 110°C x 24 hrs of materials substituted with 5wt%, 10wt%, 15wt%, and 20wt% and with 1% boron compound added as an antioxidant are shown below. It is shown in Table 3.
尚、耐スポール性の評価は、４０Ｘ４０Ｘ１６０ｍｍの
供試体を１４００℃Ｘ３ｈｒｓ前焼成し、この時の弾性
率（ＥＯ）とその後これを電気炉にて１４００℃Ｘ１５
ｍ１ｎｓ急熱後急冷する操作を２回繰り返しその弾性率
（Ｅ２）を測定（Ｅ２／ＥＯ）値で評価した。この値が
１に近い程耐スポール性が優れる。The spall resistance was evaluated by pre-firing a 40 x 40 x 160 mm specimen at 1,400°C for 3 hours, and measuring the elastic modulus (EO) at this time and then using it in an electric furnace at 1,400°C for 15 hours.
The operation of rapidly heating and then rapidly cooling for m1ns was repeated twice, and the elastic modulus (E2) was evaluated by the measured (E2/EO) value. The closer this value is to 1, the better the spalling resistance is.
実施例
以上の試験より得られた知見をもとに、高炉鍋用キャス
タブルを開発した。実施例１〜５ならびに比較例１〜４
を第４表に示す。Based on the knowledge obtained from the tests described above, a castable for blast furnace pots was developed. Examples 1 to 5 and Comparative Examples 1 to 4
are shown in Table 4.
（以下余白） 第 表 発明の効果 比較例Ｉ Ａｌｔｏｓ ＳｉＣ質材は、耐蝕性。(Margin below) No. table Effect of the invention Comparative Example I Altos SiC material is corrosion resistant.
耐スポール性に劣り、比較例２は、残存膨張性は満たす
ものの耐スポール性は更に低下する。又比較例３は、耐
スポーツ性は維持できているものの耐蝕性、残存膨張性
で満足が得られない。これに対し、本発明の実施例１〜
５に示す材料は、比較例４に示す高炉鍋使用のＡｌｚＣ
ｈ−３１ｃ−Ｃ煉瓦に近似した特性が得られると共に、
目地がなく均質組織で充填性良く、耐スポール性かつ耐
蝕性に優れた高炉鍋用ライニングキャスタブルが得られ
た。The spalling resistance is poor, and although Comparative Example 2 satisfies the residual expansion property, the spalling resistance further deteriorates. Comparative Example 3 maintains sports resistance but is unsatisfactory in terms of corrosion resistance and residual expansion. In contrast, Examples 1 to 1 of the present invention
The material shown in No. 5 is AlzC used in the blast furnace pot shown in Comparative Example 4.
Properties similar to h-31c-C bricks can be obtained, and
A lining castable for blast furnace pots with no joints, a homogeneous structure, good filling properties, and excellent spalling and corrosion resistance was obtained.
この様に好結果の得られる本発明の実施例３を比較例４
を使用している高炉鍋へ置き替えて使用した結果、築造
工数で２５％短縮で身０、寿命で３０％以上の改善が可
能となり、高炉鍋原単位の低下に寄与し、その効果は顕
著であった。Comparative Example 4
As a result of replacing the blast furnace pot with a blast furnace pot that currently uses the same, it was possible to reduce the construction man-hours by 25% and improve the lifespan by more than 30%, contributing to a reduction in the basic unit of blast furnace pots, and the effect is remarkable. Met.
第１図は、実線はＳｉＣ添加量と侵蝕厚みの関係を示す
グラフ、点線はＳｉＣ添加量と変質層厚みの関係を示す
グラフである。In FIG. 1, the solid line is a graph showing the relationship between the amount of SiC added and the thickness of the eroded layer, and the dotted line is a graph showing the relationship between the amount of SiC added and the thickness of the altered layer.
Claims (1)
の炭化珪素５〜１０ｗｔ％、粒度６〜１ｍｍのロー石５
〜１０ｗｔ％と粒度４〜１ｍｍの黒鉛を５〜１５ｗｔ％
配合した溶銑予備処理用高炉鍋ライニングキャスタブル
。The main composition is alumina raw material, 5 to 10 wt% of silicon carbide with a particle size of 0.074 mm or less, and low stone 5 with a particle size of 6 to 1 mm.
~10wt% and 5-15wt% graphite with particle size 4-1mm.
Blast furnace ladle lining castable for hot metal pretreatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2203629A JPH07112954B2 (en) | 1990-07-30 | 1990-07-30 | Blast furnace pot lining castable for hot metal pretreatment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2203629A JPH07112954B2 (en) | 1990-07-30 | 1990-07-30 | Blast furnace pot lining castable for hot metal pretreatment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0489362A true JPH0489362A (en) | 1992-03-23 |
| JPH07112954B2 JPH07112954B2 (en) | 1995-12-06 |
Family
ID=16477208
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2203629A Expired - Fee Related JPH07112954B2 (en) | 1990-07-30 | 1990-07-30 | Blast furnace pot lining castable for hot metal pretreatment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07112954B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015171991A (en) * | 2014-02-20 | 2015-10-01 | Ｊｆｅスチール株式会社 | Iron-making vessel |
| CN109020517A (en) * | 2018-08-23 | 2018-12-18 | 安徽瑞泰新材料科技有限公司 | A kind of preparation method of castable refractory |
-
1990
- 1990-07-30 JP JP2203629A patent/JPH07112954B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015171991A (en) * | 2014-02-20 | 2015-10-01 | Ｊｆｅスチール株式会社 | Iron-making vessel |
| CN109020517A (en) * | 2018-08-23 | 2018-12-18 | 安徽瑞泰新材料科技有限公司 | A kind of preparation method of castable refractory |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07112954B2 (en) | 1995-12-06 |
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|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| LAPS | Cancellation because of no payment of annual fees |