JPH0742161B2 - Manufacturing method of magnesia porous plug - Google Patents
Manufacturing method of magnesia porous plugInfo
- Publication number
- JPH0742161B2 JPH0742161B2 JP61200444A JP20044486A JPH0742161B2 JP H0742161 B2 JPH0742161 B2 JP H0742161B2 JP 61200444 A JP61200444 A JP 61200444A JP 20044486 A JP20044486 A JP 20044486A JP H0742161 B2 JPH0742161 B2 JP H0742161B2
- Authority
- JP
- Japan
- Prior art keywords
- weight
- porous plug
- zirconia
- magnesia
- present
- 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.)
- Expired - Lifetime
Links
Landscapes
- Compositions Of Oxide Ceramics (AREA)
- Manufacture And Refinement Of Metals (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、マグネシア質ポーラスプラグの製造法に係
る。TECHNICAL FIELD The present invention relates to a method for manufacturing a magnesia porous plug.
従来の技術及びその問題点 従来、１）溶鋼温度及び成分を均一化し、２）水素など
の不純ガスを除去し、３）溶鋼中に懸濁している介在物
を浮上させて溶鋼の清浄度を高めるために、取鍋内の溶
鋼にアルゴンガス等の不活性ガスを吹込み、溶鋼を攪拌
する方法が広く採用されている。Conventional technology and its problems Conventionally, 1) the temperature and composition of molten steel are made uniform, 2) impure gas such as hydrogen is removed, and 3) inclusions suspended in molten steel are floated to clean the molten steel. In order to raise the temperature, a method in which an inert gas such as argon gas is blown into the molten steel in the ladle and the molten steel is stirred is widely adopted.
上記ガス吹込法では、取鍋底に、通気性の良好なプラグ
状に成形した耐火物（以下ポーラスプラグという）を装
着し、そのプラグを通してガスを吹込むのが一般的であ
る。In the gas blowing method, it is general that a refractory (hereinafter referred to as a porous plug) formed into a plug having good air permeability is attached to the bottom of a ladle, and gas is blown through the plug.
ポーラスプラグは溶鋼と直接接触するため、通気性だけ
でなく、耐火性、耐食性及び耐スポーリング性に優れ且
つ高い熱間強度を有することをも要求されている。マグ
ネシアクリンカーを主成分とするポーラスプラグは、高
耐食性及び高耐火性であるが、気孔率が高すぎるため熱
間強度が低く、耐スポーリング性も充分ではない。Since the porous plug is in direct contact with molten steel, it is required to have not only breathability but also excellent fire resistance, corrosion resistance and spalling resistance and high hot strength. Porous plugs containing magnesia clinker as a main component have high corrosion resistance and high fire resistance, but their porosity is too high, resulting in low hot strength and insufficient spalling resistance.
上記の欠点を解消するものとして、マグネシアクリンカ
ーに酸化鉄を添加したマグネシア質ポーラスプラグが提
案されている（特公昭61-1389号）。これは、マグネシ
アクリンカーの粗粒（0.2mm以上）を使用して通気性を
確保し、酸化鉄を添加して強度を向上させたものであ
る。しかしながら、これを溶融金属へのガス吹込みに使
用すると、酸化鉄によつて液相が生成し、熱間強度が充
分に発現されず、溶鋼による摩耗を受け易い。As a solution to the above drawbacks, a magnesia porous plug in which iron oxide is added to a magnesia clinker has been proposed (Japanese Patent Publication No. 61-1389). This is one in which coarse particles of magnesia clinker (0.2 mm or more) are used to ensure air permeability, and iron oxide is added to improve strength. However, when this is used for blowing gas into molten metal, a liquid phase is generated by iron oxide, the hot strength is not sufficiently expressed, and it is susceptible to wear by molten steel.
問題点を解決するための手段 本発明者は、上記従来技術の問題点に鑑みて鋭意研究を
重ねた結果、マグネシアクリンカーにジルコニアを添加
することによつて、耐火性、耐食性及び通気性に優れ、
熱間強度及び溶鋼に対する耐摩耗性が著しく改良された
ポーラスプラグが得られることを見出し、本発明を完成
した。Means for Solving the Problems The present inventor has conducted extensive studies in view of the problems of the above-mentioned prior art, and by adding zirconia to the magnesia clinker, it is excellent in fire resistance, corrosion resistance and air permeability. ,
The present invention has been completed by finding that a porous plug having significantly improved hot strength and wear resistance to molten steel can be obtained.
即ち本発明は、粒径3mm以下、純度90％以上のマグネシ
アクリンカー90〜99重量％と粒径2mm以下のジルコニア
１〜10重量％とからなる耐火物原料100重量部及びバイ
ンダー２〜６重量部を混練し、成形し、焼成することを
特徴とするマグネシア質ポーラスプラグの製造法に係
る。That is, the present invention is a refractory raw material 100 parts by weight consisting of 90 to 99% by weight of magnesia clinker having a particle size of 3 mm or less and a purity of 90% or more and 1 to 10% by weight of zirconia having a particle size of 2 mm or less and 2 to 6 parts by weight of a binder. The present invention relates to a method for producing a magnesia porous plug, which comprises kneading, molding, and firing.
本発明では、耐火物原料として、耐火性、耐食性及び通
気性に優れるマグネシアクリンカー、並びに熱間強度及
び溶鋼に対する耐摩耗性を著しく改良できるジルコニア
を使用する。In the present invention, as a refractory material, magnesia clinker having excellent fire resistance, corrosion resistance and air permeability, and zirconia capable of remarkably improving hot strength and wear resistance to molten steel are used.
マグネシアクリンカーとしては、粒径3mm以下、MgO含量
90％以上のものを使用する。粒径が3mmを越えると、耐
火物の強度が低下し好ましくない。またMgO含量が90重
量％未満では、耐火物の耐食性が低下する。本発明で
は、マグネシアクリンカーを使用するに当つては、例え
ば、３〜1mm程度のものが０〜80重量％、１〜0.3mm程度
のものが０〜80重量部、0.044mm以下程度のものが５〜2
0重量％程度となるように粒度調整すればよい。マグネ
シアクリンカーの配合量は、耐火物原料全量の90〜99重
量％程度とするのがよい。90重量％未満では、耐火物の
耐食性が低下する。一方99重量％を越えると、熱間強度
が低下する。As a magnesia clinker, particle size is 3mm or less, MgO content
Use 90% or more. If the particle size exceeds 3 mm, the strength of the refractory material decreases, which is not preferable. On the other hand, if the MgO content is less than 90% by weight, the corrosion resistance of the refractory material decreases. In the present invention, when using the magnesia clinker, for example, those having a thickness of 3 to 1 mm are 0 to 80% by weight, those having a diameter of 1 to 0.3 mm are 0 to 80 parts by weight, and those having a diameter of 0.044 mm or less are used. 5-2
The particle size may be adjusted to be about 0% by weight. The magnesia clinker content is preferably about 90 to 99% by weight of the total amount of the refractory raw material. If it is less than 90% by weight, the corrosion resistance of the refractory material decreases. On the other hand, if it exceeds 99% by weight, the hot strength decreases.
ジルコニア（ZrO2）としては、未安定化ジルコニア及び
安定化ジルコニアのいずれもが使用できるが、結晶系の
変態（単斜格子立方格子）によつて靱性の強化即ち耐
スポーリング性の向上を期待できる未安定化ジルコニア
の方が好ましい。As the zirconia (ZrO 2 ), both unstabilized zirconia and stabilized zirconia can be used, but it is expected that the toughness will be enhanced, that is, the spalling resistance will be improved by the crystal transformation (monoclinic cubic lattice). Unstabilized zirconia that can be obtained is preferable.
ジルコニアの粒径は2mm以下程度、好ましくは0.044mm以
下程度とするのがよい。粒径が2mmを越えるジルコニア
粒子を使用すると、耐火物組織中に均一に分散せず、耐
火物の強度が不均一となり好ましくない。The particle size of zirconia is about 2 mm or less, preferably about 0.044 mm or less. The use of zirconia particles having a particle size of more than 2 mm is not preferable because it does not disperse uniformly in the refractory structure and the refractory strength becomes uneven.
ジルコニアの配合量は、耐火物原料の１〜10重量％程度
とするのがよい。１重量％未満では、熱間強度向上効果
がなく、一方10重量％を越えると、耐火物が焼結し難く
なり、強度劣化を誘発する。The blending amount of zirconia is preferably about 1 to 10% by weight of the refractory raw material. If it is less than 1% by weight, there is no effect of improving the hot strength, while if it exceeds 10% by weight, it becomes difficult to sinter the refractory material and the strength is deteriorated.
ジルコニア粒子は、マグネシアクリンカー中のペリクレ
ース結晶とダイレクトボンドを形成するとともに、MgO
粒子中に生成する液相を高粘性、高融点化し、且つ液相
を分断するという効果を有するため、耐火物に実炉使用
に耐え得る充分な熱間強度を付与し、溶鋼に対する耐摩
耗性を向上させる。The zirconia particles form a direct bond with the periclase crystals in the magnesia clinker, and
Since it has the effect of making the liquid phase generated in the particles highly viscous, having a high melting point, and dividing the liquid phase, it gives the refractory material sufficient hot strength to withstand the use in an actual furnace and wear resistance to molten steel. Improve.
本発明では、バインダーとしては、通常耐火物に用いら
れるものが何れも使用でき、例えば、ニガリ、シヨ糖、
リグニン、糖蜜等を挙げることができる。バインダーの
配合量は、耐火物原料100重量部に対し２〜５重量部程
度とするのがよい。２重量部未満では、耐火物の成形性
が劣る。一方６重量部を越えると、ラミネーシヨン、亀
裂が発生しやすくなる。In the present invention, as the binder, any of those usually used for refractories can be used, for example, bittern, sucrose,
Examples include lignin and molasses. The binder content is preferably about 2 to 5 parts by weight per 100 parts by weight of the refractory raw material. If it is less than 2 parts by weight, the moldability of the refractory is poor. On the other hand, if it exceeds 6 parts by weight, lamination and cracks are likely to occur.
本発明ポーラスプラグは、上記各原料の夫々所定量を混
練し、この混練物をオイルプレス等の通常の方法にて40
0〜1000kg/cm2程度の圧力下に適当な大きさのプラグ状
に成形し、この成形体を1600〜1800℃で焼成することに
よつて製造される。The porous plug of the present invention is obtained by kneading a predetermined amount of each of the above raw materials, and kneading the kneaded product by an ordinary method such as an oil press.
It is manufactured by molding into a plug having an appropriate size under a pressure of about 0 to 1000 kg / cm 2 , and firing the molded body at 1600 to 1800 ° C.
発明の効果 本発明ポーラスプラグは、マグネシアクリンカーによつ
て優れた耐火物、耐食性及び通気性を付与され、更にジ
ルコニアによつて高い熱間強度及び溶鋼に対する耐摩耗
性を付与されている。また、溶鋼又はスラグ浸透層が極
めて薄く、使用時には表面のみが薄く剥離するので、通
気性を維持でき、更に耐スポーリング性を向上させるこ
とができる。EFFECTS OF THE INVENTION The porous plug of the present invention is provided with excellent refractories, corrosion resistance and air permeability by the magnesia clinker, and further provided with high hot strength and wear resistance to molten steel by zirconia. Further, since the molten steel or slag permeation layer is extremely thin and only the surface is thinly peeled off during use, breathability can be maintained and spalling resistance can be further improved.
実施例 以下に実施例及び比較例を挙げ、本発明をより一層明瞭
なものとする。EXAMPLES The present invention will be further clarified by giving Examples and Comparative Examples below.
実施例１〜５ 耐火物原料（マグネシアクリンカーのMgO含有量は95
％）を第１表に示す配合割合で使用し、耐火物原料100
重量部にバイダンダーとしてシヨ糖の50％水溶液3.5重
量部を加え、ミキサーで20分間混練した。この混練物
は、オイルプレスにて1000kg/cm2の圧力下に成形して、
高さ170mm、径80〜110mmの截頭円錐形（プラグ状）成形
体とした。この成形体を1690℃で焼成し、本発明ポーラ
スプラグを得た。Examples 1 to 5 Refractory raw material (MgO content of magnesia clinker is 95
%) Is used in the mixing ratio shown in Table 1, and the refractory raw material 100
3.5 parts by weight of a 50% aqueous solution of sucrose as a binder was added to the parts by weight, and the mixture was kneaded for 20 minutes with a mixer. This kneaded product was molded under an oil press under a pressure of 1000 kg / cm 2 ,
A frusto-conical (plug-shaped) molded body having a height of 170 mm and a diameter of 80 to 110 mm was used. The molded body was fired at 1690 ° C. to obtain the porous plug of the present invention.
得られた本発明ポーラスプラグ用耐火物を性能試験に供
した。結果を第１表に示す。The obtained refractory material for a porous plug of the present invention was subjected to a performance test. The results are shown in Table 1.
比較例１ ジルコニアに代えて酸化鉄（Fe2O3）を使用する以外は
実施例と同様にして従来のポーラスプラグを得、性能試
験を供した。結果を第１表に示す。Comparative Example 1 A conventional porous plug was obtained in the same manner as in the example except that iron oxide (Fe 2 O 3 ) was used instead of zirconia, and the performance test was performed. The results are shown in Table 1.
第１表より、本発明品（実施例１〜５）が、従来品（比
較例１）に比べ、通気性、耐食性、耐スポーリング性及
び熱間強度に優れていることが判る。 It can be seen from Table 1 that the products of the present invention (Examples 1 to 5) are superior to the conventional product (Comparative Example 1) in air permeability, corrosion resistance, spalling resistance and hot strength.
本発明品（実施例１）と従来品とを夫々取鍋に装着し、
アルゴンガスを通して各種溶鋼の撹拌を行ない、１チャ
ージ当りの溶損量（mm/ch）を調べた。結果を第２表に
示す。The product of the present invention (Example 1) and the conventional product are attached to a ladle,
Various molten steels were stirred through argon gas to examine the amount of melting loss (mm / ch) per charge. The results are shown in Table 2.
第２表より、本発明品が、従来品に比べ溶鋼に対する耐
摩耗性に優れていることが判る。 It can be seen from Table 2 that the product of the present invention is superior in wear resistance to molten steel as compared with the conventional product.
Claims (1)
クリンカー90〜99重量％と粒径2mm以下のジルコニア１
〜10重量％とからなる耐火物原料100重量部及びバイン
ダー２〜６重量部を混練し、成形し、焼成することを特
徴とするマグネシア質ポーラスプラグの製造法。1. A zirconia 1 having a particle diameter of 3 mm or less and a magnesia clinker 90 to 99% by weight having a purity of 90% or more and a particle diameter of 2 mm or less.
A method for producing a magnesia porous plug, characterized by kneading 100 parts by weight of a refractory raw material consisting of ˜10% by weight and 2 to 6 parts by weight of a binder, molding and firing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61200444A JPH0742161B2 (en) | 1986-08-26 | 1986-08-26 | Manufacturing method of magnesia porous plug |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61200444A JPH0742161B2 (en) | 1986-08-26 | 1986-08-26 | Manufacturing method of magnesia porous plug |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6355158A JPS6355158A (en) | 1988-03-09 |
| JPH0742161B2 true JPH0742161B2 (en) | 1995-05-10 |
Family
ID=16424398
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61200444A Expired - Lifetime JPH0742161B2 (en) | 1986-08-26 | 1986-08-26 | Manufacturing method of magnesia porous plug |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0742161B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4040458A1 (en) * | 1990-12-18 | 1992-06-25 | Aken Magnesitwerk Gmbh | POROESES, FIRE-RESISTANT SPOOL ELEMENT |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6051659A (en) * | 1983-08-30 | 1985-03-23 | ハリマセラミック株式会社 | Porous nozzle |
| JPS6065778A (en) * | 1983-09-19 | 1985-04-15 | ハリマセラミック株式会社 | Porous slag |
| JPS611389U (en) * | 1984-06-08 | 1986-01-07 | 正二 岩井 | Workbench |
-
1986
- 1986-08-26 JP JP61200444A patent/JPH0742161B2/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6051659A (en) * | 1983-08-30 | 1985-03-23 | ハリマセラミック株式会社 | Porous nozzle |
| JPS6065778A (en) * | 1983-09-19 | 1985-04-15 | ハリマセラミック株式会社 | Porous slag |
| JPS611389U (en) * | 1984-06-08 | 1986-01-07 | 正二 岩井 | Workbench |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6355158A (en) | 1988-03-09 |
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