JPH09103870A - Structure of packing material for tap hole - Google Patents
Structure of packing material for tap holeInfo
- Publication number
- JPH09103870A JPH09103870A JP28803595A JP28803595A JPH09103870A JP H09103870 A JPH09103870 A JP H09103870A JP 28803595 A JP28803595 A JP 28803595A JP 28803595 A JP28803595 A JP 28803595A JP H09103870 A JPH09103870 A JP H09103870A
- Authority
- JP
- Japan
- Prior art keywords
- particles
- molten metal
- filler
- feldspar
- oxygen
- 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.)
- Withdrawn
Links
Landscapes
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
- Porous Artificial Stone Or Porous Ceramic Products (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、溶湯容器出湯孔の無酸
素開孔に適した充填材構造に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filler structure suitable for oxygen-free opening of a molten metal container outlet.
【０００２】[0002]
【従来の技術】溶湯容器の出湯孔にはスライディングノ
ズル，ロータリノズル等が装着されており、ノズルの開
閉によって出湯及び出湯停止が行われる。ノズル部に溶
湯の侵入があると、侵入した溶湯が凝固してノズル閉塞
が生じる。閉塞したノズルは、酸素吹込みによってノズ
ル部を強制開孔する作業が必要とされ、製銑・製鋼工程
のタイムスケジュールを狂わせる原因となる。酸素吹込
みによるノズル部の強制開孔を少なくするため、出湯ま
での間ノズル部に充填材を詰めて溶湯の侵入を防止し、
出湯時にノズルを開放したとき充填材をノズル部から落
下させる無酸素開孔が採用されている。2. Description of the Related Art Sliding nozzles, rotary nozzles, etc. are mounted in the tap holes of a molten metal container, and tapping and stopping of tapping are performed by opening and closing the nozzles. When the molten metal enters the nozzle portion, the invaded molten metal solidifies to cause nozzle clogging. For the clogged nozzle, it is necessary to forcibly open the nozzle portion by blowing oxygen, which causes the time schedule of the ironmaking / steelmaking process to be upset. In order to reduce the forced opening of the nozzle part due to oxygen injection, the nozzle part is filled with filler to prevent molten metal from entering,
Oxygen-free openings are used to drop the filler from the nozzle when the nozzle is opened when tapping hot water.
【０００３】充填材としては、珪石，珪砂等を基材と
し、湯差し防止のために充填材／溶湯の界面に粘稠な膜
を形成させる長石を配合したものが使用されている。た
とえば、特公昭５５−１８１９４号公報では、２〜１２
重量％のアルカリ類を配合した粒径０．５〜２．５ｍｍ
のシリカからなる充填材が紹介されている。この種の充
填材には、湯差しを防ぎ、しかも溶湯荷重が加わったと
きに破壊される適度の厚みをもつ焼結層が形成される焼
結性をもつことが要求される。焼結し難い材料では充填
材内部に湯差しが生じ、却って酸素吹込みによる強制開
孔が必要になる。逆に、過度に焼結し易い材料では、焼
結層の成長が著しく、ノズルを開放したとき充填材に加
わる溶湯荷重によっても焼結層が破壊されず、充填材が
ノズル部から落下しなくなる。その結果、同様に酸素吹
込みによる強制開孔が必要になる。As the filler, there is used one in which silica stone, silica sand or the like is used as a base material, and feldspar which forms a viscous film at the filler / molten metal interface is blended in order to prevent simmering. For example, in Japanese Patent Publication No. 55-18194, 2-12
Particle size 0.5-2.5 mm blended with weight% alkalis
The filler made of silica is introduced. This type of filler is required to have a sinterability that prevents pouring and forms a sintered layer having an appropriate thickness that is destroyed when a molten metal load is applied. For materials that are difficult to sinter, there is a pouring of water inside the filling material, which in turn requires forced opening by blowing oxygen. On the contrary, if the material is excessively easy to sinter, the growth of the sintered layer is remarkable, and the molten layer applied to the filler when the nozzle is opened does not destroy the sintered layer and the filler does not drop from the nozzle. . As a result, forced opening is also required by blowing oxygen.
【０００４】最近の高清浄度鋼溶湯に対する要求が高ま
ってきている傾向に対応して、溶湯容器内における溶湯
の精錬負荷が増大し、溶湯容器内に溶湯が長時間保持さ
れるようになってきている。そのため、溶湯容器の出湯
孔を閉塞するために従来から使用されている珪石，珪砂
等のＳｉＯ2 系充填材では、高温の溶湯に長時間曝され
るため過焼結してしまい、無酸素開孔ができなくなる。
そこで、より適切な焼結性を持つ充填材の開発が要求さ
れる。適度の焼結性をもち、無酸素開孔に適した充填材
としては、溶湯との接触により湯差し防止に有効な粘稠
の焼結層を形成する上層と、焼結層の成長を抑制する難
焼結性の下層との２層構造をもつ充填材構造が知られて
いる。たとえば、特開平５−２００５０６号公報では、
ＳｉＯ2 を主成分とする粒子を上層用充填材とするノズ
ル内充填構造において、Ａｌ2 Ｏ3 含有量６０〜１００
重量％，粒径０．３ｍｍ以上の粒子を下層充填材として
使用することが紹介されている。In response to the recent increasing demand for high-cleanliness steel molten metal, the refining load of the molten metal in the molten metal container has increased, and the molten metal has been held in the molten metal container for a long time. ing. Therefore, SiO 2 -based fillers such as silica stones and silica sand that have been conventionally used to block the tap holes of the molten metal container are over-sintered because they are exposed to the high temperature molten metal for a long time, resulting in oxygen-free opening. No holes are formed.
Therefore, development of a filler having more appropriate sinterability is required. As a filler that has appropriate sinterability and is suitable for oxygen-free openings, it suppresses the growth of the sintered layer and the upper layer that forms a viscous sintered layer that is effective for preventing pouring when it contacts the molten metal. There is known a filler structure having a two-layer structure with a hard-to-sinter lower layer. For example, in Japanese Unexamined Patent Publication No. 5-200506,
In a nozzle filling structure in which particles having SiO 2 as a main component are used as a filler for the upper layer, an Al 2 O 3 content of 60 to 100
It has been introduced to use particles having a weight percentage of 0.3 mm or more as a lower layer filler.
【０００５】[0005]
【発明が解決しようとする課題】しかし、従来の２層充
填材構造の下層成分であるＡｌ2 Ｏ3 は、溶湯温度近傍
の１５００〜１８００Ｋで熱伝導性がＳｉＯ2 よりも約
４倍高い。そのため、単にＡｌ2 Ｏ3 粒子を充填材とし
て使用しただけでは、充填材に接した溶湯の凝固を招
き、生成した凝固シェルが無酸素開孔率を低下させる原
因となる。また、Ａｌ2 Ｏ3 含有量が７０重量％を下回
ったり、或いはＡｌ2 Ｏ3 粒子の粒径が１ｍｍ以下にな
ると、Ａｌ2 Ｏ3 粒子が相互に焼結する傾向がみられ
る。これによっても、無酸素開孔率が低下する。本発明
は、このような問題を解消すべく案出されたものであ
り、特定粒径のＡｌ2 Ｏ3 粒子と長石粒子を組み合わせ
て使用することにより、湯差しや過焼結をを防止し、出
湯時の無酸素開孔率を高めた充填材構造を提供すること
を目的とする。However, Al 2 O 3, which is a lower layer component of the conventional two-layer filler structure, has a thermal conductivity about 4 times higher than that of SiO 2 at 1500 to 1800 K near the temperature of the molten metal. Therefore, simply using Al 2 O 3 particles as the filler causes solidification of the molten metal in contact with the filler, and the solidified shell thus formed causes the oxygen-free porosity to decrease. Further, when the Al 2 O 3 content is less than 70% by weight or when the particle size of Al 2 O 3 particles is 1 mm or less, the Al 2 O 3 particles tend to sinter each other. This also reduces the oxygen free porosity. The present invention has been devised to solve such a problem, and by using Al 2 O 3 particles having a specific particle diameter and feldspar particles in combination, it is possible to prevent jug and oversintering. An object of the present invention is to provide a filler structure having an improved oxygen-free porosity when tapping hot water.
【０００６】[0006]
【課題を解決するための手段】本発明の出湯孔用充填材
構造は、その目的を達成するため、Ａｌ2 Ｏ3 含有量７
０重量％以上，粒径１．０〜２．０ｍｍの粒子からなる
多孔質又は中空の下層と、粒径０．５〜２．０ｍｍの長
石粒子又は粒径０．５〜２．０ｍｍの長石粒子と粒径
０．５〜２．０ｍｍの珪石粒子との混合物からなる上層
との二層構造をもつことを特徴とする。長石と珪石との
混合物を上層に使用する場合、珪石の配合割合を８０重
量％以下にする必要がある。The filler structure for tap holes according to the present invention has an Al 2 O 3 content of 7 in order to achieve the object.
0% by weight or more, a porous or hollow lower layer composed of particles having a particle size of 1.0 to 2.0 mm, and feldspar particles having a particle size of 0.5 to 2.0 mm or feldspar having a particle size of 0.5 to 2.0 mm It is characterized by having a two-layer structure of an upper layer made of a mixture of particles and silica stone particles having a particle size of 0.5 to 2.0 mm. When a mixture of feldspar and silica stone is used in the upper layer, it is necessary that the blending ratio of silica stone be 80% by weight or less.
【０００７】[0007]
【作用】本発明者等は、充填材の種類と性質との関係に
ついて予備実験を繰り返した。その結果、易焼結性のＳ
ｉＯ2 系やＭｇＯ系の粒子を充填材の基材として使用す
ると焼結層が厚くなってしまうこと、難焼結性のＡｌ2
Ｏ3 系粒子を使用すると湯差しが生じ易いこと、またＡ
ｌ2 Ｏ3 系の粒子は熱伝導率が高いために断熱性が低い
充填層となることを知見した。そこで、本発明の充填材
構造においては、充填材の焼結層を薄くするため難焼結
性のＡｌ2 Ｏ3 系粒子を基材として多孔質又は中空状の
下層を形成し、その上に粘稠な膜を形成する長石が配置
された２層構造を採用した。The present inventors repeated a preliminary experiment on the relationship between the type of filler and its properties. As a result, easily sinterable S
When io 2 or MgO particles are used as the base material of the filler, the sintered layer becomes thicker and Al 2
If O 3 type particles are used, it is easy to cause a jug
It has been found that the particles of the l 2 O 3 system have a high thermal conductivity and thus form a packed layer having a low heat insulating property. Therefore, in the filler structure of the present invention, in order to make the sintered layer of the filler thin, a porous or hollow lower layer is formed using Al 2 O 3 -based particles, which are difficult to sinter, as a base material, and the lower layer is formed thereon. A two-layer structure was used in which feldspars forming a viscous film were arranged.
【０００８】下層は、充填材と接触する溶湯が凝固しな
いように、Ａｌ2 Ｏ3 粒子を多孔質又は中空状にするこ
とにより断熱性を向上させた。多孔質又は中空状とは、
内部に空隙があるものをいい、空隙率Ｐは次式で表され
る。 Ｐ＝（ｄ0 −ｄ）／ｄ0 ＝Ｖ0 ／（Ｖb ＋Ｖp ） ただし、ｄ：真の密度 ｄ0 ：見掛けの密度 Ｖp ：空隙部の総体積 Ｖb ：物質の体積 本発明者等の実験によるとき、後述の実施例でも示され
ているようにＡｌ2 Ｏ3 の空隙率を５０％以上にする
と、見掛けの熱伝導率をＳｉＯ2 以下にすることができ
る。これにより、断熱性の向上が図られる。下層の成分
は、焼結特性を調査した結果、Ａｌ2 Ｏ3 粒子以外の成
分が３０重量％以下であれば特に焼結性に悪影響を及ぼ
さないことが判った。しかし、粒径１．０ｍｍ未満の粒
子を含む場合、Ａｌ2 Ｏ3 粒子の焼結反応が促進され、
強固な焼結層が生成し易くなる。このような焼結層の生
成を防止するため、粒径が１．０ｍｍ以上のＡｌ2 Ｏ3
粒子を使用する必要がある。しかし、粒径が２．０ｍｍ
を超える粗粒が含まれると、粒子間隙への長石の侵入に
よって過焼結が生じ易くなる。The lower layer has improved heat insulating properties by making Al 2 O 3 particles porous or hollow so that the molten metal contacting the filler does not solidify. What is porous or hollow?
It has a void inside, and the void ratio P is expressed by the following equation. P = (d 0 -d) / d 0 = V 0 / (V b + V p) , however, d: a true density d 0: apparent density V p: the total volume V b of the void portions: the volume of the material present invention According to the experiments by the inventors, when the porosity of Al 2 O 3 is 50% or more, the apparent thermal conductivity can be made SiO 2 or less, as shown in the examples described later. Thereby, the heat insulating property is improved. As a result of investigating the sintering characteristics of the components of the lower layer, it was found that the components other than the Al 2 O 3 particles did not adversely affect the sinterability particularly if the components were 30% by weight or less. However, when particles having a particle size of less than 1.0 mm are included, the sintering reaction of Al 2 O 3 particles is promoted,
A strong sintered layer is easily generated. In order to prevent the formation of such a sintered layer, Al 2 O 3 having a grain size of 1.0 mm or more is used.
It is necessary to use particles. However, the particle size is 2.0 mm
If coarse particles exceeding 1 are contained, oversintering easily occurs due to the intrusion of feldspar into the interstices of the particles.
【０００９】他方、上層としては、湯差しを防ぐための
添加材に長石を使用する。長石は、焼結層をより薄くす
るため、基材Ａｌ2 Ｏ3 と混合することなく、充填材の
上層として使用する。この長石粒子は、０．５〜２．０
ｍｍの粒径をもつものが好ましい。粒径が０．５ｍｍ未
満の微細粒子ではＡｌ2 Ｏ3 粒子と過焼結する虞れがあ
り、粒径が２．０ｍｍを超える粗粒では溶鋼に洗い流さ
れて流失する割合が多くなる。長石のみで形成される上
層は、溶湯の温度や溶湯容器内の撹拌強度等の精錬条件
によっては、溶湯に洗い流されて流失する虞れがある。
このような場合、溶湯温度で溶融しない粒子を長石と混
合して用いることが好ましい。溶湯温度で溶融しない粒
子としては、コスト等の面からすると珪石が好適であ
る。長石に対する珪石の配合比率は、８０重量％を超え
るとき長石のもつ粘稠な膜を生成する作用が損なわれる
ことから、８０重量％以下にすることが好ましい。On the other hand, as an upper layer, feldspar is used as an additive material for preventing a water jug. Feldspar is used as the upper layer of the filler without being mixed with the base material Al 2 O 3 in order to make the sintered layer thinner. This feldspar particle is 0.5-2.0
Those with a particle size of mm are preferred. Fine particles with a particle size of less than 0.5 mm may be over-sintered with Al 2 O 3 particles, and coarse particles with a particle size of more than 2.0 mm are more likely to be washed away by molten steel and flow away. Depending on the refining conditions such as the temperature of the molten metal and the stirring strength in the molten metal container, the upper layer formed only of feldspar may be washed away by the molten metal and may be washed away.
In such a case, it is preferable to use particles that do not melt at the temperature of the molten metal mixed with feldspar. Silica stone is preferable as a particle that does not melt at the temperature of the molten metal from the viewpoint of cost and the like. When the blending ratio of silica stone to feldspar exceeds 80% by weight, the action of feldspar to form a viscous film is impaired, so that it is preferably 80% by weight or less.
【００１０】[0010]
【実施例】表１及び表２に示した充填材構造で出湯孔を
閉塞した溶湯容器を使用し、ＳＵＳ４３０溶鋼７５トン
をＶＯＤで約６０分精錬し、１５９０℃で出鋼した。出
湯孔の閉塞に際し、本実施例ではマスレンガの上に充填
材の盛り上げ部を高さ１００ｍｍで形成したが、この盛
り上げには上層材を使用した。なお、表１及び表２にお
ける充填材高さは、深さ３５０ｍｍのマスレンガに対し
て上層及び下層それぞれを充填した高さを示す。また、
下層に多孔質材を使用したときには気孔体積を、中空材
を使用したときには嵩比重をそれぞれ併せ示した。EXAMPLE Using a molten metal container having the filling material structure shown in Tables 1 and 2 and having tap holes closed, 75 tons of SUS430 molten steel was smelted by VOD for about 60 minutes and tapped at 1590 ° C. At the time of closing the tap hole, in this example, the filling portion of the filling material was formed with a height of 100 mm on the mass brick, but the upper layer material was used for this raising. In addition, the height of the filler in Table 1 and Table 2 indicates the height at which the upper layer and the lower layer are filled with respect to a mass brick having a depth of 350 mm. Also,
The pore volume is shown when a porous material is used for the lower layer, and the bulk specific gravity is shown when a hollow material is used.
【００１１】 [0011]
【００１２】 [0012]
【００１３】実施例１〜３は、上層に珪石を配合せず、
下層に多孔質材を使用し、上層及び下層の充填高さを変
更した例である。この場合、深さ３５０ｍｍのマスレン
ガに対して下層を２００〜３００ｍｍの範囲で充填した
場合について実機に適用したところ、８０％以上の高い
無酸素開孔率が得られた。実施例４は、下層を中空材と
し、アルミナ含有量を７２．１重量％まで低下した例で
ある。アルミナ含有量の低下に伴って過焼結し易くなる
が、実施例４から７０重量％までアルミナ含有量を低下
しても過焼結の影響がなく高い無酸素開孔率が得られて
いることが判る。実施例５，６は、下層を多孔質材と
し、上層に珪石を配合した例である。珪石を８０重量％
配合した実施例６にあっても、８０％の高い無酸素開孔
率が得られている。何れの実施例においても、表２に比
較例８として示す従来材の無酸素開孔率が７０％である
ことと比較すると、無酸素開孔率が向上していることが
判る。In Examples 1 to 3, silica stone was not mixed in the upper layer,
In this example, a porous material is used for the lower layer and the filling heights of the upper layer and the lower layer are changed. In this case, when the lower layer was filled in a range of 200 to 300 mm with respect to a mass brick having a depth of 350 mm, when it was applied to an actual machine, a high oxygen-free open area ratio of 80% or more was obtained. Example 4 is an example in which the lower layer is a hollow material and the alumina content is reduced to 72.1% by weight. Although oversintering tends to occur as the alumina content decreases, even if the alumina content is reduced from Example 4 to 70% by weight, there is no effect of oversintering and a high oxygen-free porosity is obtained. I understand. Examples 5 and 6 are examples in which the lower layer is made of a porous material and silica stone is mixed in the upper layer. 80% silica by weight
Even in the compounded Example 6, a high oxygen-free open area ratio of 80% was obtained. In any of the examples, it can be seen that the oxygen-free porosity is improved as compared with the conventional material shown in Table 2 as Comparative Example 8 having an oxygen-free porosity of 70%.
【００１４】比較例１は、下層に中実材を使用した例で
ある。この場合、無酸素開孔率が４５％に低下した。こ
の低い無酸素開孔率は、Ａｌ2 Ｏ3 粒子の熱伝導率が高
いために充填材と接触した溶鋼が凝固した結果と推察さ
れる。比較例２，３は、下層の粒径を変更した例であ
る。粗粒を含む比較例２及び細粒を含む比較例３の何れ
にあっても、無酸素開孔率が５５〜６５％と低下してい
る。この無酸素開孔率の低下は、粒径１．０ｍｍ未満の
Ａｌ2 Ｏ3 粒子が含まれると過焼結が生じ、２ｍｍを超
える粒径のＡｌ2 Ｏ3 粒子が含まれると上層からの長石
の侵入によって過焼結が生じた結果である。比較例４
は、下層のＡｌ2 Ｏ3 粒子として中空材を使用し、Ａｌ
2 Ｏ3 含有量を５４．７重量％まで低下した例である。
この場合、Ａｌ2 Ｏ3 粒子の不純物が増加したためにＡ
ｌ2 Ｏ3 粒子が過焼結され、無酸素開孔率が５０％まで
低下したものと推察される。Comparative Example 1 is an example in which a solid material is used for the lower layer. In this case, the oxygen free porosity was reduced to 45%. This low oxygen-free porosity is presumed to be the result of solidification of the molten steel in contact with the filler due to the high thermal conductivity of the Al 2 O 3 particles. Comparative Examples 2 and 3 are examples in which the particle size of the lower layer was changed. In both Comparative Example 2 containing coarse particles and Comparative Example 3 containing fine particles, the oxygen-free open area ratio was lowered to 55 to 65%. This decrease in the oxygen-free porosity is caused by over-sintering when Al 2 O 3 particles having a particle size of less than 1.0 mm are contained, and from the upper layer when Al 2 O 3 particles having a particle size of more than 2 mm is contained. This is the result of oversintering caused by the intrusion of feldspars. Comparative Example 4
Uses a hollow material as the Al 2 O 3 particles in the lower layer.
This is an example in which the 2 O 3 content is reduced to 54.7% by weight.
In this case, the amount of impurities in the Al 2 O 3 particles increased, so
It is speculated that the 1 2 O 3 particles were over-sintered and the oxygen-free porosity was reduced to 50%.
【００１５】比較例５，６は、上層として使用される長
石の粒径を変更した例である。粗粒を含む長石を使用し
た比較例５及び細粒を含む長石を使用した比較例６共
に、無酸素開孔率が５５〜６５％に低下している。この
無酸素開孔率の低下は、粒径が２．０ｍｍを超える粒子
を含む長石がＶＯＤ精錬中に溶鋼で洗い流され、また
０．５ｍｍ未満の粒子を含む長石がＡｌ2 Ｏ3 粒子と過
焼結した結果であると推察される。比較例７は、下層を
多孔質材とし、上層に珪石を配合した例である。珪石を
９０重量％まで配合すると、無酸素開孔率が４５％まで
低下した。このことから、珪石の配合比率が８０重量％
を超えると、長石のもつ粘稠な膜を生成する作用が損な
われるため湯差しが生じ、結果として無酸素開孔率が低
下することが確認される。Comparative Examples 5 and 6 are examples in which the particle size of the feldspar used as the upper layer is changed. In both Comparative Example 5 using feldspar containing coarse particles and Comparative Example 6 using feldspar containing fine particles, the oxygen-free porosity was reduced to 55 to 65%. This decrease in oxygen-free porosity is due to the fact that feldspars containing particles with a diameter of more than 2.0 mm are washed away with molten steel during VOD refining, and feldspars containing particles of less than 0.5 mm pass over with Al 2 O 3 particles. It is assumed that this is the result of sintering. Comparative Example 7 is an example in which the lower layer is made of a porous material and the upper layer is mixed with silica stone. When silica was blended up to 90% by weight, the oxygen-free porosity decreased to 45%. From this, the blending ratio of silica stone is 80% by weight.
It is confirmed that when it exceeds, the effect of forming a viscous film of feldspar is impaired and a jug occurs, resulting in a decrease in anoxic open area ratio.
【００１６】[0016]
【発明の効果】以上に説明したように、本発明において
は、Ａｌ2 Ｏ3 系の下層に長石を主とする上層を重ねた
二層の充填材構造とし、且つ下層を多孔質又は中空状に
することによって断熱性を持たせ湯差しを防止し、使用
するＡｌ2 Ｏ3 ，長石等の粒径を制御することによって
過焼結を抑制している。このようにして、本発明の充填
材構造によるとき、精錬負荷が大きな溶湯容器にあって
も高い無酸素開孔率が確保される。As described above, in the present invention, the Al 2 O 3 -based lower layer is laminated with the upper layer mainly composed of feldspar to form a two-layer filler structure, and the lower layer is porous or hollow. In order to prevent the over-sintering by controlling the grain size of Al 2 O 3 , feldspar, etc. to be used. In this way, according to the filling material structure of the present invention, a high oxygen-free porosity is secured even in a molten metal container having a large refining load.
Claims (2)
１．０〜２．０ｍｍの粒子からなる多孔質又は中空の下
層と、粒径０．５〜２．０ｍｍの長石粒子からなる上層
との二層構造をもち、溶湯容器の出湯孔に投入された充
填材で形成される出湯孔用充填材構造。1. A porous or hollow lower layer composed of particles having an Al 2 O 3 content of 70% by weight or more and a particle size of 1.0 to 2.0 mm and feldspar particles having a particle size of 0.5 to 2.0 mm. The filling material structure for the tap hole, which has a two-layer structure with the upper layer, and is formed by the filler put into the tap hole of the molten metal container.
長石粒子に粒径０．５〜２．０ｍｍの珪石粒子を８０重
量％以下配合した混合物を使用した請求項１記載の出湯
孔用充填材構造。2. The tap water according to claim 1, wherein the upper layer is a mixture of feldspar particles having a particle size of 0.5 to 2.0 mm and silica stone particles having a particle size of 0.5 to 2.0 mm in an amount of 80% by weight or less. Filler structure for holes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28803595A JPH09103870A (en) | 1995-10-09 | 1995-10-09 | Structure of packing material for tap hole |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28803595A JPH09103870A (en) | 1995-10-09 | 1995-10-09 | Structure of packing material for tap hole |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09103870A true JPH09103870A (en) | 1997-04-22 |
Family
ID=17724988
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28803595A Withdrawn JPH09103870A (en) | 1995-10-09 | 1995-10-09 | Structure of packing material for tap hole |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09103870A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021212781A1 (en) * | 2020-04-24 | 2021-10-28 | 中信戴卡股份有限公司 | Ladle for casting aluminum alloy |
-
1995
- 1995-10-09 JP JP28803595A patent/JPH09103870A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021212781A1 (en) * | 2020-04-24 | 2021-10-28 | 中信戴卡股份有限公司 | Ladle for casting aluminum alloy |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20030107 |