JP2016175093A - Molten metal holding device - Google Patents

Molten metal holding device Download PDF

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JP2016175093A
JP2016175093A JP2015056289A JP2015056289A JP2016175093A JP 2016175093 A JP2016175093 A JP 2016175093A JP 2015056289 A JP2015056289 A JP 2015056289A JP 2015056289 A JP2015056289 A JP 2015056289A JP 2016175093 A JP2016175093 A JP 2016175093A
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molten metal
refractory
metal holding
silicon carbide
molten
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JP6472286B2 (en
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龍太 西田
Ryuta Nishida
龍太 西田
智宏 小嶋
Tomohiro Kojima
智宏 小嶋
剛 萱間
Go Kayama
剛 萱間
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TYK Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a molten metal holding device that comprises durability to the molten metal of nonferrous metal and is long life, and holds the molten metal of the nonferrous metal.SOLUTION: A molten metal holding device 1 has a molten metal holding unit made of a refractory for holding the molten metal of nonferrous metal. The molten metal holding unit includes a refractory brick 5(a) on a portion for receiving the molten metal of the nonferrous metal poured, and includes a castable layer 4 on the remaining portion. The refractory brick 5(a) is a firing shaped refractory with the porosity of 10% to 20%, containing a silicon carbide of 60% to 95% at the weight ratio and the remainder comprising alumina. The castable layer 4 is a monolithic refractory with the porosity of 5% to 15%, containing the silicon carbide of 30% to 90% at a weight ratio and the remainder comprising alumina. Furthermore, the percentage of weight of the silicon carbide of the refractory brick 5(a) is 1.05-2.00 times the percentage of weight of the silicon carbide of the castable layer 4. The porosity of the refractory brick 5(a) is 1.3-2.0 times the porosity of the castable layer 4.SELECTED DRAWING: Figure 2

Description

本発明は、銅、アルミニウム、亜鉛等の非鉄金属の溶湯を受け止め、この非鉄金属の溶湯を保持する溶湯保持装置に関する。   The present invention relates to a molten metal holding device that receives a molten non-ferrous metal such as copper, aluminum, and zinc and holds the molten non-ferrous metal.

流し込まれる高温の金属溶湯を受け止め、この金属溶湯を保持する溶湯保持装置が提供されている。従来、非鉄金属の溶湯を保持する溶湯保持装置は、流動性をもつ不定形耐火物であるキャスタブル材を現場で流し込むことにより形成されている。溶銑を保持する溶湯保持装置は、流動性をもつキャスタブル材を現場で流し込むことにより形成され、または、多数の煉瓦を現場で築造することにより形成されている。   There is provided a molten metal holding device that receives a molten high-temperature molten metal and holds the molten metal. 2. Description of the Related Art Conventionally, a molten metal holding device for holding a molten non-ferrous metal is formed by pouring a castable material, which is a fluid refractory refractory, on site. The molten metal holding device for holding molten iron is formed by pouring a castable material having fluidity on site or by building a large number of bricks on site.

しかし、不定形耐火物であるキャスタブル材を流し込んで形成した場合は耐久性が必ずしも充分でない。多数の煉瓦を現場で築造した場合には、煉瓦の目地に先行溶損が発生したり、築造に時間を要したり、使用条件によって煉瓦が脱落したりする問題がある。   However, when castable material that is an irregular refractory material is poured, the durability is not always sufficient. When a large number of bricks are built on site, there is a problem that prior melting damage occurs in the joints of the bricks, time is required for building, or the bricks fall off depending on use conditions.

特許文献1には、高炉から延設される出銑樋から出銑される溶銑を受け止め、この受け止めた溶銑を保持する傾注樋の発明が開示されている。   Patent Document 1 discloses an invention of a tilting iron that receives hot metal discharged from a hot metal extending from a blast furnace and holds the received hot metal.

特開2002−69515号公報JP 2002-69515 A

非鉄金属の溶湯は溶銑と比べ粘性が低く、溶銑と比べて溶湯が耐火物の奥深くまで浸透し易い。更に、非鉄金属の溶湯は溶銑と比べて耐火物表面によく濡れるため、耐火物表面に非鉄金属の溶湯が張り付き易い。そして、耐火物が冷えて温度が低下すると、耐火物内部に浸透した溶湯と耐火物表面に張り付いた溶湯とが共に繋がった状態で固化して非鉄金属が析出する。   Non-ferrous metal melt has a lower viscosity than hot metal, and the hot metal penetrates deeper into the refractory than hot metal. Furthermore, since the molten non-ferrous metal wets the surface of the refractory better than the molten iron, the molten non-ferrous metal tends to stick to the surface of the refractory. And when a refractory cools and temperature falls, the molten metal which permeate | transmitted the inside of the refractory and the molten metal adhering to the surface of a refractory are solidified, and a nonferrous metal precipitates.

この状態で溶湯保持装置に非鉄金属の溶湯を保持させると、耐火物内部に析出している非鉄金属が加熱膨張して周囲の耐火物に亀裂を発生させてから再び溶ける。その結果、耐火物のより一層深い部分まで非鉄金属の溶湯が浸透することになり溶湯保持装置の破損を招く。   When the molten metal holding device holds the molten nonferrous metal in this state, the nonferrous metal deposited inside the refractory is heated and expanded to cause cracks in the surrounding refractory and then melt again. As a result, the molten non-ferrous metal penetrates to a deeper portion of the refractory, resulting in damage to the molten metal holding device.

そこで、再加熱による溶湯の浸透を抑制するために冷却固化して析出した非鉄金属の除去作業を行うことが必要となる。しかしながら、耐火物の表面には非鉄金属の溶湯が張り付き易く、更に非鉄金属の溶湯は耐火物内部の奥深くまで浸透し易い。そのため、頻繁に除去作業を行う必要があり手間を要する。   Therefore, in order to suppress the penetration of the molten metal due to reheating, it is necessary to remove the non-ferrous metal deposited by cooling and solidification. However, the nonferrous metal melt tends to stick to the surface of the refractory, and the nonferrous metal melt easily penetrates deep into the refractory. For this reason, it is necessary to frequently perform the removal work, which is troublesome.

その一方で、頻繁に除去作業を行うと耐火物表面における面荒れが進行するため、より一層非鉄金属の溶湯が耐火物表面に付着し易くなる。従って、除去作業後の溶湯保持装置の使用によって、耐火物表面に析出する非鉄金属の厚みは増大する。更に、非鉄金属の溶湯は耐火物内の奥深くに浸透し易いため、1回の除去作業で剥離する必要がある耐火物の層の厚みが大きい。そのため、除染作業後の溶湯保持装置の使用によって、非鉄金属の溶湯は耐火物内のより一層深い位置まで浸透することになる。その結果、頻繁に除去作業を行うことで、耐火物自体が劣化して溶湯保持装置の寿命を縮める。   On the other hand, since the surface roughness on the surface of the refractory proceeds when the removal work is frequently performed, the non-ferrous metal melt is more likely to adhere to the surface of the refractory. Therefore, the thickness of the nonferrous metal deposited on the surface of the refractory increases by using the molten metal holding device after the removing operation. Furthermore, since the molten non-ferrous metal easily penetrates deep into the refractory, the thickness of the refractory layer that needs to be peeled off by one removal operation is large. Therefore, by using the molten metal holding device after the decontamination work, the molten non-ferrous metal penetrates to a deeper position in the refractory. As a result, by frequently performing the removal work, the refractory itself deteriorates and the life of the molten metal holding device is shortened.

そこで、本発明は、非鉄金属の溶湯に対する耐久性を具備した長寿命である非鉄金属の溶湯を保持する溶湯保持装置を提供することを課題とする。   Then, this invention makes it a subject to provide the molten metal holding | maintenance apparatus which hold | maintains the long-life nonferrous metal molten metal with durability with respect to the molten nonferrous metal.

本発明の溶湯保持装置は、非鉄金属の溶湯を保持する炭化珪素とアルミナで構成された耐火物製の溶湯保持部を有する溶湯保持装置であって、溶湯保持部は溶湯保持部に流し込まれる溶湯を受け止める焼成定形耐火物で形成された溶湯受け止め部と、残りの不定形耐火物で形成された本体部と、からなり、本体部を形成する不定形耐火物は重量比で炭化珪素を30%〜90%含み残りがアルミナからなり且つその気孔率は体積比で5%〜15%であり、溶湯受け止め部を形成する焼成定形耐火物は重量比で炭化珪素を60%〜95%含み残りがアルミナからなり該炭化珪素の重量の百分率は前記本体部を形成する不定形耐火物の炭化珪素の重量の百分率の1.05〜2.00倍であり、かつ、該焼成定形耐火物の気孔率は体積比で10%〜20%であり該気孔率は本体部の不定形耐火物の気孔率の1.3〜2.0倍である、ことを特徴とするものである。   The molten metal holding device according to the present invention is a molten metal holding device having a molten metal holding portion made of refractory made of silicon carbide and alumina for holding a molten non-ferrous metal, and the molten metal holding portion is poured into the molten metal holding portion. The molten metal receiving portion formed of a fired fixed refractory and a main body portion formed of the remaining amorphous refractory, and the amorphous refractory forming the main body portion contains 30% silicon carbide by weight. -90% containing remainder is made of alumina and the porosity is 5-15% by volume, and the fired fixed refractory forming the molten metal receiving part contains 60% -95% silicon carbide by weight. The percentage of the weight of the silicon carbide made of alumina is 1.05 to 2.00 times the percentage of the weight of the silicon carbide of the amorphous refractory forming the main body, and the porosity of the fired shaped refractory Is 10% to 2 by volume % A and the gas hole ratio is 1.3 to 2.0 times the porosity of the monolithic refractory of the main body, it is characterized in.

本発明の溶湯保持装置は耐火物製の溶湯保持部を有する。この溶湯保持部は容器状の構造であり、銅、アルミニウム、亜鉛等の非鉄金属の溶湯を保持する。なお、溶湯保持部は底浅であっても底深であってもよい。この溶湯保持部は、該溶湯保持部に流し込まれる溶湯を受け止める溶湯受け止め部と、残りの本体部と、から形成されている。   The molten metal holding | maintenance apparatus of this invention has a molten metal holding | maintenance part made from a refractory. This molten metal holding part has a container-like structure, and holds a molten metal of non-ferrous metal such as copper, aluminum, and zinc. The molten metal holding part may be shallow or deep at the bottom. The molten metal holding portion is formed of a molten metal receiving portion that receives the molten metal poured into the molten metal holding portion, and the remaining main body portion.

溶湯受け止め部は、取鍋やノズルから流下する非鉄金属の溶湯を直接受け止める部分である。そのため、この溶湯受け止め部は溶湯が浸透し易い部分である。また、この溶湯受け止め部は溶湯に浸食されやすい部分である。従って、溶湯受け止め部は非鉄金属の溶湯に対する耐浸透性と耐浸食性を十分に備える必要がある。そこで、この溶湯受け止め部は予め成形して焼成された焼成品であり、不焼成定形耐火物よりも面荒れが起きにくく耐久性に優れる焼成定形耐火物で形成される。溶湯受け止め部は、一枚の板状の焼成定形耐火物で形成することができる。この場合、目地に発生する溶損を防止できる。なお、溶湯受け止め部は、多数の焼成定形耐火物を敷設して形成することもできる。溶湯受け止め部は、重量比で炭化珪素を60%〜95%含み残りがアルミナからなり且つその気孔率は体積比で10%〜20%である焼成定形耐火物で形成されている。この焼成定形耐火物で形成される溶湯受け止め部は、非鉄金属の溶湯に対する耐浸透性と耐浸食性に優れている。   The molten metal receiving part is a part that directly receives the molten nonferrous metal flowing down from the ladle or nozzle. Therefore, the molten metal receiving portion is a portion where the molten metal easily penetrates. Further, the molten metal receiving portion is a portion that is easily eroded by the molten metal. Therefore, the molten metal receiving part needs to have sufficient penetration resistance and erosion resistance to the molten non-ferrous metal. Therefore, the molten metal receiving portion is a fired product that is molded and fired in advance, and is formed of a fired fixed refractory that is less likely to be rough than the unfired fixed refractory and has excellent durability. The molten metal receiving portion can be formed of a single plate-shaped fired fixed refractory. In this case, it is possible to prevent melting damage occurring at the joint. The molten metal receiving portion can be formed by laying a large number of fired fixed refractories. The molten metal receiving portion is formed of a fired fixed refractory material having a weight ratio of silicon carbide of 60% to 95%, the remainder being made of alumina, and a porosity of 10% to 20%. The molten metal receiving portion formed of the fired fixed refractory is excellent in penetration resistance and erosion resistance with respect to the molten non-ferrous metal.

本体部は、現場における施工が容易である不定形耐火物で形成される。不定形耐火物にはキャスタブル耐火物を用いることができる。この場合、流し込み用、吹付用またはこて塗用のキャスタブル耐火物を用いることができる。本体部は、重量比で炭化珪素を30%〜90%含み残りがアルミナからなり且つその気孔率は体積比で5%〜15%である不定形耐火物で形成されている。なお、ここでいう不定形耐火物の気孔率は乾燥後の不定形耐火物の気孔率である。本体部が重量比で炭化珪素を30%〜90%含む不定形耐火物で形成されると、該本体部の表面は非鉄金属の溶湯で濡れにくくなり、該本体部の表面に溶湯が張り付きにくくなる。また、該本体部は非鉄金属の溶湯に対する耐浸食性に優れる。更に、該本体部は耐スポーリング性にも優れる。その一方で、炭化珪素が重量比で30%より小さい場合は非鉄金属の溶湯が本体部の表面に張り付く傾向や非鉄金属の溶湯で本体部の表面が浸食される傾向がみられ、耐スポーリング性も低下する。炭化珪素が重量比で90%より大きい場合は不定形耐火物の流動性が低下するため、施工することに時間を要する。また、結合剤等の添加剤を用いて不定形耐火物を調整することが困難となり、不定形耐火物の熱伝導性や膨張性及び耐食性などを考慮した設計を行うことが困難になる。   The main body is formed of an irregular refractory that is easy to construct on site. A castable refractory can be used as the irregular refractory. In this case, castable refractories for pouring, spraying or ironing can be used. The main body is formed of an amorphous refractory having a weight ratio of 30% to 90% of silicon carbide, the remainder being made of alumina, and a porosity of 5% to 15%. The porosity of the amorphous refractory referred to here is the porosity of the amorphous refractory after drying. If the main body part is formed of an amorphous refractory containing 30% to 90% silicon carbide by weight, the surface of the main body part is difficult to get wet with a non-ferrous metal melt, and the molten metal is less likely to stick to the surface of the main body part. Become. Further, the main body portion is excellent in erosion resistance against molten metal of non-ferrous metal. Furthermore, the main body is excellent in spalling resistance. On the other hand, when silicon carbide is less than 30% by weight, the non-ferrous metal melt tends to stick to the surface of the main body and the surface of the main body is eroded by the non-ferrous metal melt. The nature is also reduced. When silicon carbide is larger than 90% by weight, the fluidity of the amorphous refractory is lowered, so that construction takes time. In addition, it becomes difficult to adjust the amorphous refractory using an additive such as a binder, and it becomes difficult to design the amorphous refractory in consideration of the thermal conductivity, expandability, and corrosion resistance.

更に、溶湯受け止め部を形成する焼成定形耐火物に含まれる炭化珪素の重量の百分率は、本体部を形成する不定形耐火物の炭化珪素の重量の百分率の1.05倍〜2.00倍である。すなわち、溶湯受け止め部を形成する焼成定形耐火物と本体部を形成する不定形耐火物の炭化珪素の重量の百分率は異なっており、上記した関係をもつ。溶湯受け止め部を形成する焼成定形耐火物の炭化珪素の重量の百分率と本体部を形成する不定形耐火物の炭化珪素の重量の百分率とが上記した関係にある場合、溶湯保持部全体の非鉄金属に対する耐浸食性が向上する。   Furthermore, the percentage of the weight of silicon carbide contained in the fired fixed refractory forming the molten metal receiving part is 1.05 to 2.00 times the percentage of the weight of silicon carbide of the amorphous refractory forming the main body part. is there. That is, the percentage of the weight of silicon carbide in the fired fixed refractory forming the molten metal receiving portion and the amorphous refractory forming the main body portion is different and has the above-described relationship. When the percentage of the weight of silicon carbide in the fired fixed refractory forming the molten metal receiving portion and the percentage of the weight of silicon carbide in the amorphous refractory forming the main body portion are in the above relationship, the non-ferrous metal of the entire molten metal holding portion The erosion resistance against is improved.

また、溶湯受け止め部を形成する焼成定形耐火物の気孔率は本体部を形成する不定形耐火物の気孔率の1.3倍〜2.0倍である。すなわち、溶湯受け止め部を形成する焼成定形耐火物と本体部を形成する不定形耐火物の気孔率は異なっており、上記した関係をもつ。溶湯受け止め部を形成する焼成定形耐火物の気孔率と本体部を形成する不定形耐火物の気孔率とが上記した関係にある場合、溶湯保持部全体の耐スポーリング性が向上する。   The porosity of the fired fixed refractory forming the molten metal receiving part is 1.3 to 2.0 times the porosity of the amorphous refractory forming the main body part. That is, the porosity of the fired fixed refractory forming the molten metal receiving portion and the amorphous refractory forming the main body portion are different and have the above-described relationship. When the porosity of the fired fixed refractory that forms the molten metal receiving portion and the porosity of the amorphous refractory that forms the main body portion are in the relationship described above, the spalling resistance of the entire molten metal holding portion is improved.

本発明の溶湯保持装置の溶湯保持部は、該溶湯保持部に保持された溶湯を放出する焼成定形耐火物で形成された溶湯放出部と、を更にもつことができる。   The molten metal holding part of the molten metal holding device of the present invention can further have a molten metal discharging part formed of a fired fixed refractory that discharges the molten metal held in the molten metal holding part.

溶湯放出部は、溶湯保持部に保持された非鉄金属の溶湯を溶湯保持装置の外部へ放出可能とする部分である。溶湯保持装置の外部に放出される溶湯がこの溶湯放出部に集中する。そのため、溶湯放出部は浸食されやすい。従って、この溶湯放出部は、不焼成定形耐火物よりも面荒れが起きにくく耐久性に優れた予め成形して焼成される焼成定形耐火物で形成されていることが好ましい。溶湯放出部は、重量比で炭化珪素を60%〜95%含み残りがアルミナからなりその気孔率は体積比で10%〜20%である焼成定形耐火物で形成されることが好ましい。この場合、非鉄金属の溶湯に対する耐浸食性が向上する。また、該焼成定形耐火物の炭化珪素の百分率は、本体部を形成する不定形耐火物の炭化珪素の重量の百分率の1.05〜2.00倍であるとよい。更に、該焼成定形耐火物の気孔率は該不定形耐火物の気孔率の1.3倍〜2.0倍であるとよい。この場合、溶湯保持部全体の非鉄金属の溶湯に対する耐浸食性と耐スポーリング性が向上するため、溶湯保持装置の更なる長寿命化を図ることができる。   A molten metal discharge | release part is a part which can discharge | release the molten metal of the nonferrous metal hold | maintained at the molten metal holding | maintenance part to the exterior of a molten metal holding | maintenance apparatus. The molten metal discharged to the outside of the molten metal holding device concentrates on the molten metal discharge portion. Therefore, the molten metal discharge part is easily eroded. Therefore, it is preferable that this molten metal discharge | release part is formed with the baking fixed refractory which carries out the shaping | molding and baking which was hard to produce surface roughness rather than a non-baking fixed refractory and was excellent in durability. The molten metal discharge part is preferably formed of a fired fixed refractory having a weight ratio of silicon carbide of 60% to 95%, the remainder being made of alumina and a porosity of 10% to 20%. In this case, the erosion resistance with respect to the molten nonferrous metal improves. The percentage of silicon carbide in the fired fixed refractory is preferably 1.05 to 2.00 times the percentage of silicon carbide in the amorphous refractory that forms the main body. Further, the porosity of the fired fixed refractory is preferably 1.3 to 2.0 times the porosity of the amorphous refractory. In this case, the erosion resistance and spalling resistance of the entire molten metal holding portion with respect to the molten nonferrous metal are improved, so that the life of the molten metal holding device can be further extended.

溶湯保持部が溶湯受け止め部と本体部とを備える溶湯保持装置は、取鍋、タンディッシュ、樋、又はルツボとして用いることができる。   The molten metal holding | maintenance apparatus with which a molten metal holding | maintenance part is provided with a molten metal receiving part and a main-body part can be used as a ladle, a tundish, a trough, or a crucible.

溶湯保持部が溶湯受け止め部と本体部と溶湯放出部とを備える溶湯保持装置は、取鍋、タンディッシュ、又は樋として用いることができる。   The molten metal holding | maintenance apparatus with which a molten metal holding | maintenance part is equipped with a molten metal receiving part, a main-body part, and a molten metal discharge | release part can be used as a ladle, a tundish, or a trough.

本発明の溶湯保持装置は、溶湯保持部の外周面に断熱層を設け、該断熱層の外周面を鉄皮で覆うこともできる。すなわち、本発明の溶湯保持装置は、鉄皮と該鉄皮の内周面に形成された断熱層と、該断熱層の内周面に形成された溶湯保持部と、から形成されていてもよい。この場合、溶湯の保温効果に優れる。   The molten metal holding | maintenance apparatus of this invention can also provide a heat insulation layer in the outer peripheral surface of a molten metal holding | maintenance part, and can also cover the outer peripheral surface of this heat insulating layer with an iron skin. That is, the molten metal holding device of the present invention may be formed of an iron skin, a heat insulating layer formed on the inner peripheral surface of the iron shell, and a molten metal holding portion formed on the inner peripheral surface of the heat insulating layer. Good. In this case, the heat retaining effect of the molten metal is excellent.

断熱層は、多数の焼成定形耐火物を敷設して形成することができる。また、炭素繊維やセラミックス繊維を敷き詰めて形成することもできる。   The heat insulating layer can be formed by laying a large number of fired fixed refractories. It can also be formed by spreading carbon fibers or ceramic fibers.

本発明の溶湯保持装置は、非鉄金属の溶湯に対する耐久性を具備しており、長寿命化を図ることができる。   The molten metal holding device of the present invention has durability against a molten non-ferrous metal, and can extend the life.

実施形態の溶湯保持装置の平面図である。It is a top view of the molten metal holding | maintenance apparatus of embodiment. 実施形態の溶湯保持装置の縦断面図(W1−W1線)である。It is a longitudinal cross-sectional view (W1-W1 line) of the molten metal holding | maintenance apparatus of embodiment. 実施形態の溶湯保持装置の横断面図(W2−W2線矢視図)である。It is a cross-sectional view (W2-W2 line arrow view) of the molten metal holding | maintenance apparatus of embodiment. 実施形態の溶湯保持装置の横断面図(W3−W3線矢視図)である。It is a cross-sectional view (W3-W3 line arrow view) of the molten metal holding | maintenance apparatus of embodiment. 実施形態の溶湯保持装置の横断面図(W4−W4線矢視図)である。It is a cross-sectional view (W4-W4 arrow view) of the molten metal holding | maintenance apparatus of embodiment.

実施形態の溶湯保持装置1を図1〜図5に示す。この実施形態の溶湯保持装置1は略直方体であり、その外周側の側面と底面を形成する容器状の鉄皮2と、断熱煉瓦層3と、溶湯保持装置1の内側に設けられたキャスタブル層4と、溶湯を受け止める部分に設けられた耐火煉瓦5aと、溶湯を放出する部分に設けられた耐火煉瓦5bと、から形成されている。そして、溶湯保持装置1の内側には、キャスタブル層4と耐火煉瓦(5a、5b)が壁面となるように、略長円形の容器状の空間が形成されている。また、この溶湯保持装置1の内側の空間と溶湯保持装置1の外部を連通する底穴6が形成されている。   The molten metal holding | maintenance apparatus 1 of embodiment is shown in FIGS. The molten metal holding device 1 of this embodiment is a substantially rectangular parallelepiped, a container-shaped iron skin 2 that forms a side surface and a bottom surface on the outer peripheral side, a heat insulating brick layer 3, and a castable layer provided inside the molten metal holding device 1. 4 and a refractory brick 5a provided at a portion for receiving the molten metal, and a refractory brick 5b provided at a portion for discharging the molten metal. And inside the molten metal holding | maintenance apparatus 1, the substantially oval container-shaped space is formed so that the castable layer 4 and a refractory brick (5a, 5b) may become a wall surface. Further, a bottom hole 6 that communicates the space inside the molten metal holding device 1 and the outside of the molten metal holding device 1 is formed.

すなわち、実施形態の溶湯保持装置1は、流し込まれる非鉄金属の溶湯を受け止める溶湯受け止め部を形成する耐火煉瓦5aと、本体部を形成するキャスタブル層4と、保持された溶湯を外部へ放出する溶湯放出部を形成する耐火煉瓦5bと、からなる非鉄金属の溶湯を保持する溶湯保持部を備えている。   That is, the molten metal holding device 1 of the embodiment includes a refractory brick 5a that forms a molten metal receiving portion that receives a molten non-ferrous metal, a castable layer 4 that forms a main body portion, and a molten metal that discharges the held molten metal to the outside. A refractory brick 5b that forms a discharge portion and a molten metal holding portion that holds a molten non-ferrous metal are provided.

鉄皮2は、図2〜図5の溶湯保持装置1の断面図に示すように、上面が開口であり、上面が底面よりも広くなるように側面のほぼ全体で傾斜をもつ略U字の断面をもつ容器形状である。また、底面の一部には穴が形成されている。   As shown in the cross-sectional views of the molten metal holding device 1 in FIGS. 2 to 5, the iron skin 2 has a substantially U-shape with the upper surface being an opening and the entire upper surface being inclined so that the upper surface is wider than the bottom surface. It is a container shape with a cross section. A hole is formed in a part of the bottom surface.

断熱煉瓦層3は、図2〜図5の溶湯保持装置1の断面図に示すように、鉄皮2の内周側に多数の耐火断熱煉瓦を敷設することで形成される。なお、耐火断熱煉瓦は、熱伝導率が低い耐火煉瓦である。耐火断熱層3の厚さは鉄皮2の厚さとほぼ同じになるように形成されている。   The heat insulating brick layer 3 is formed by laying a large number of refractory heat insulating bricks on the inner peripheral side of the iron shell 2 as shown in the cross-sectional views of the molten metal holding device 1 in FIGS. In addition, a refractory heat insulation brick is a refractory brick with low heat conductivity. The thickness of the refractory heat insulation layer 3 is formed to be substantially the same as the thickness of the iron skin 2.

キャスタブル層4は、鉄皮2の内周側に多数の耐火断熱煉瓦を敷設した後に、流動性をもつキャスタブル材を流し込んで鋳込み成形することで形成される。すなわち、図2〜図5の溶湯保持装置1の断面図に示すように、キャスタブル層4は、溶湯保持装置1の内側で鉄皮2と断熱煉瓦層3を覆うように形成されている。また、キャスタブル層4は、図2の溶湯保持装置1の断面図に示すように、溶湯保持装置1の底穴6へ溶湯を流す緩やかな傾斜面を形成している。この傾斜面の傾斜角は5°である。キャスタブル層4は、重量比で炭化珪素を30%〜90%含み残りがアルミナからなる。また、キャスタブル層4は体積比で5%〜15%の気孔率を有する。なお、キャスタブル層4の気孔率は乾燥後のキャスタブル層4の気孔率である。このキャスタブル層4の表面は非鉄金属の溶湯で濡れにくく、該溶湯がキャスタブル層4の表面に張り付きにくい。また、このキャスタブル層4は非鉄金属の溶湯に対する耐浸食性と耐スポーリング性に優れる。   The castable layer 4 is formed by pouring a castable material having fluidity after casting a large number of fireproof and heat insulating bricks on the inner peripheral side of the iron skin 2. That is, as shown in the sectional views of the molten metal holding device 1 in FIGS. 2 to 5, the castable layer 4 is formed so as to cover the iron skin 2 and the heat insulating brick layer 3 inside the molten metal holding device 1. Moreover, the castable layer 4 forms a gently sloping surface through which the molten metal flows into the bottom hole 6 of the molten metal holding device 1, as shown in the cross-sectional view of the molten metal holding device 1 in FIG. The inclination angle of this inclined surface is 5 °. The castable layer 4 is composed of 30% to 90% silicon carbide by weight and the remainder is made of alumina. The castable layer 4 has a porosity of 5% to 15% by volume ratio. The porosity of the castable layer 4 is the porosity of the castable layer 4 after drying. The surface of the castable layer 4 is difficult to get wet with the molten non-ferrous metal, and the molten metal is difficult to stick to the surface of the castable layer 4. The castable layer 4 is excellent in erosion resistance and spalling resistance with respect to a molten non-ferrous metal.

溶湯受け止め部を形成する耐火煉瓦5aと溶湯放出部を形成する耐火煉瓦5bは、図2、図3、図5の溶湯保持装置1の断面図に示すように、キャスタブル層4に埋設されており、このキャスタブル層4と一体となっている。この耐火煉瓦(5a、5b)は、不焼成定形耐火物よりも面荒れが起きにくく耐久性に優れる予め成形され焼成された焼成定形耐火物である。キャスタブル層4の傾斜面の上流側に配置され、溶湯受け止め部を形成している耐火煉瓦5aは、図1の溶湯保持装置1の平面図に示すように、一枚の平板形状である。一方で、キャスタブル層4の傾斜面の下流側に配置され、溶湯放出部を形成している耐火煉瓦5bは、図2と図5の溶湯保持装置1の断面図に示すように、溶湯を放出する穴を中心に備えた平板形状である。また、この穴は溶湯保持装置1の底穴6を形成している。耐火煉瓦5aおよび耐火煉瓦5bは、重量比で炭化珪素を60%〜95%含み残りがアルミナからなりその気孔率は体積比で10%〜20%である焼成定形耐火物から形成されている。この焼成定形耐火物で形成された耐火煉瓦(5a、5b)は、非鉄金属の溶湯に対する耐浸透性と耐浸食性に優れている。   The refractory brick 5a that forms the molten metal receiving portion and the refractory brick 5b that forms the molten metal discharge portion are embedded in the castable layer 4 as shown in the cross-sectional views of the molten metal holding device 1 in FIGS. The castable layer 4 is integrated. These refractory bricks (5a, 5b) are pre-formed and fired fired fixed refractories that are less prone to surface roughness than non-fired fixed refractories and have excellent durability. As shown in the plan view of the molten metal holding device 1 in FIG. 1, the refractory brick 5 a arranged on the upstream side of the inclined surface of the castable layer 4 and forming the molten metal receiving portion has a single flat plate shape. On the other hand, the refractory brick 5b, which is disposed downstream of the inclined surface of the castable layer 4 and forms the molten metal discharge portion, discharges the molten metal as shown in the cross-sectional views of the molten metal holding device 1 in FIGS. It has a flat plate shape with a center hole. Further, this hole forms a bottom hole 6 of the molten metal holding device 1. The refractory brick 5a and the refractory brick 5b are formed of a fired regular refractory having a weight ratio of silicon carbide of 60% to 95%, the remainder being made of alumina and a porosity of 10% to 20% by volume. The refractory bricks (5a, 5b) formed of the fired fixed refractory are excellent in permeation resistance and erosion resistance with respect to molten non-ferrous metal.

実施形態の溶湯保持装置1は上記の構成を備える。   The molten metal holding | maintenance apparatus 1 of embodiment is equipped with said structure.

次に、この実施形態の溶湯保持装置1の作用の一例を説明する。   Next, an example of the operation of the molten metal holding device 1 of this embodiment will be described.

まず、耐火煉瓦5aに向けて、図示されていない取鍋やノズルから非鉄金属の溶湯が流下する。このとき、耐火煉瓦5aは非鉄金属の溶湯の流下を直接受け止める。この耐火煉瓦5aに受け止められた溶湯は、キャスタブル層4と耐火煉瓦(5a、5b)からなる溶湯保持部で保持される。そして、保持された溶湯は、耐火煉瓦5bが形成している底穴6へキャスタブル層4の傾斜面を沿うように流れ、この底穴6を介して溶湯保持装置1の外部に放出される。なお、1600℃付近において、炭化珪素は空気雰囲気の下で分解するおそれがあるため、溶湯保持装置1内に保持されている非鉄金属の溶湯の温度は1400℃以下であることが好ましい。
このキャスタブル層4の表面は非鉄金属の溶湯で濡れにくく、該溶湯がキャスタブル層4の表面に張り付きにくい。また、このキャスタブル層4は非鉄金属の溶湯に対する耐浸食性と耐スポーリング性に優れる。その一方で、非鉄金属の溶湯の浸透や浸食が発生しやすい溶湯受け止め部と溶湯放出部は、耐火煉瓦(5a、5b)で形成されている。従って、溶湯保持部の耐久性を向上させることができる。そのため、実施形態の溶湯保持装置1は非鉄金属の溶湯に対する耐久性を具備しており長寿命化を図ることができる。
First, a non-ferrous metal melt flows down from a ladle or nozzle (not shown) toward the refractory brick 5a. At this time, the refractory brick 5a directly receives the flow of the molten non-ferrous metal. The molten metal received by the refractory brick 5a is held by a molten metal holding portion including the castable layer 4 and the refractory brick (5a, 5b). Then, the held molten metal flows along the inclined surface of the castable layer 4 to the bottom hole 6 formed by the refractory brick 5 b, and is discharged to the outside of the molten metal holding device 1 through the bottom hole 6. Since silicon carbide may decompose under an air atmosphere at around 1600 ° C., the temperature of the molten non-ferrous metal held in the molten metal holding device 1 is preferably 1400 ° C. or lower.
The surface of the castable layer 4 is difficult to get wet with the molten non-ferrous metal, and the molten metal is difficult to stick to the surface of the castable layer 4. The castable layer 4 is excellent in erosion resistance and spalling resistance with respect to a molten non-ferrous metal. On the other hand, the molten metal receiving portion and the molten metal discharge portion that are likely to cause penetration and erosion of the molten non-ferrous metal are formed of refractory bricks (5a, 5b). Therefore, the durability of the molten metal holding part can be improved. Therefore, the molten metal holding | maintenance apparatus 1 of embodiment has durability with respect to the molten metal of a nonferrous metal, and can achieve lifetime improvement.

1 溶湯保持装置
2 鉄皮
3 耐火断熱層
4 キャスタブル層
5(a)耐火煉瓦
5(b)耐火煉瓦
6 底穴
DESCRIPTION OF SYMBOLS 1 Molten metal holding device 2 Iron skin 3 Fireproof heat insulation layer 4 Castable layer 5 (a) Refractory brick 5 (b) Refractory brick 6 Bottom hole

Claims (5)

非鉄金属の溶湯を保持する炭化珪素とアルミナで構成された耐火物製の溶湯保持部を有する溶湯保持装置であって、
前記溶湯保持部は前記溶湯保持部に流し込まれる前記溶湯を受け止める焼成定形耐火物で形成された溶湯受け止め部と、残りの不定形耐火物で形成された本体部と、からなり、
前記本体部を形成する不定形耐火物は重量比で炭化珪素を30%〜90%含み残りがアルミナからなり且つその気孔率は体積比で5%〜15%であり、
前記溶湯受け止め部を形成する焼成定形耐火物は重量比で炭化珪素を60%〜95%含み残りがアルミナからなり該炭化珪素の重量の百分率は前記本体部を形成する不定形耐火物の炭化珪素の重量の百分率の1.05〜2.00倍であり、かつ、該焼成定形耐火物の気孔率は体積比で10%〜20%であり該気孔率は前記本体部の不定形耐火物の気孔率の1.3〜2.0倍である、
ことを特徴とする溶湯保持装置。
A molten metal holding device having a molten metal holding part made of refractory made of silicon carbide and alumina for holding a molten non-ferrous metal,
The molten metal holding part is composed of a molten metal receiving part formed of a fired fixed refractory that receives the molten metal poured into the molten metal holding part, and a main body part formed of the remaining amorphous refractory,
The amorphous refractory forming the main body is 30% to 90% silicon carbide by weight and the remainder is made of alumina, and the porosity is 5% to 15% by volume.
The fired fixed refractory forming the molten metal receiving portion is composed of 60% to 95% silicon carbide by weight and the remainder is made of alumina. The percentage of the weight of the silicon carbide is silicon carbide of the amorphous refractory forming the main body portion. 1.05 to 2.00 times the percentage by weight of the baked shaped refractory, and the porosity of the fired shaped refractory is 10% to 20% by volume, and the porosity of the amorphous refractory of the main body portion is 1.3 to 2.0 times the porosity,
The molten metal holding | maintenance apparatus characterized by the above-mentioned.
前記溶湯保持部は前記溶湯保持部に保持された前記溶湯を放出する焼成定形耐火物で形成された溶湯放出部と、を更にもち、
前記溶湯放出部を形成する焼成定形耐火物は重量比で炭化珪素を60%〜95%含み残りがアルミナからなり該炭化珪素の重量の百分率は前記本体部を形成する不定形耐火物の炭化珪素の重量の百分率の1.05倍〜2.00倍であり、かつ、該焼成定形耐火物の気孔率は体積比で10%〜20%であり該気孔率は前記本体部の不定形耐火物の気孔率の1.3倍〜2.0倍である、
請求項1に記載の溶湯保持装置。
The molten metal holding part further includes a molten metal discharge part formed of a fired fixed refractory that discharges the molten metal held in the molten metal holding part,
The fired fixed refractory forming the molten metal discharge part is composed of 60% to 95% silicon carbide by weight and the remainder is made of alumina. The percentage of the weight of the silicon carbide is silicon carbide of the amorphous refractory forming the main body part. 1.05 times to 2.00 times the percentage of the weight of the baked shaped refractory, and the porosity of the fired shaped refractory is 10% to 20% by volume. 1.3 to 2.0 times the porosity of
The molten metal holding device according to claim 1.
請求項1に記載の溶湯保持装置は取鍋、タンディッシュ、樋、又はルツボのいずれかである。   The molten metal holding device according to claim 1 is any of a ladle, a tundish, a jar, or a crucible. 請求項2に記載の溶湯保持装置は取鍋、タンディッシュ、又は樋のいずれかである。   The molten metal holding | maintenance apparatus of Claim 2 is either a ladle, a tundish, or a bowl. 鉄皮と該鉄皮の内周面に形成された断熱層と、
該断熱層の内周面に形成された前記溶湯保持部と、からなる
請求項1〜請求項4のいずれか一項に記載の溶湯保持装置。
A heat insulating layer formed on the inner peripheral surface of the iron skin and the iron skin,
The molten metal holding unit according to any one of claims 1 to 4, further comprising: the molten metal holding portion formed on an inner peripheral surface of the heat insulating layer.
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