JP2003322479A - Electrode member - Google Patents
Electrode memberInfo
- Publication number
- JP2003322479A JP2003322479A JP2002127200A JP2002127200A JP2003322479A JP 2003322479 A JP2003322479 A JP 2003322479A JP 2002127200 A JP2002127200 A JP 2002127200A JP 2002127200 A JP2002127200 A JP 2002127200A JP 2003322479 A JP2003322479 A JP 2003322479A
- Authority
- JP
- Japan
- Prior art keywords
- electrode member
- raw material
- graphite
- furnace bottom
- expanded graphite
- 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.)
- Pending
Links
Landscapes
- Discharge Heating (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
- Furnace Details (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、電気炉に使用され
る電極部材、特に導電性（電気比抵抗）に優れる電極部
材に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrode member used in an electric furnace, and particularly to an electrode member excellent in conductivity (electrical specific resistance).
【０００２】[0002]
【従来の技術】直流電気炉等の電極（炉底電極）は、電
気抵抗値が十分に低いこと、また高温に曝されるため、
高耐スポーリング性、更に溶鋼の流動による浸食作用を
受けるため、高耐食性等が要求される。そのため炉底電
極では、電気の導通部にMgO-C質，Al2O3-C質等の炭素を
含有した炉底電極部材を用い、通電させながら鋼やスラ
グの加熱や溶解処理が行われる場合がある。該炉底電極
部材の電気抵抗値が高いと、所望の通電が得られず、ま
た炉底電極部材内部において電気抵抗によって発熱が生
じて耐火物の耐用性が低下する問題がある。2. Description of the Related Art Electrodes (furnace bottom electrodes) of direct current electric furnaces, etc. have sufficiently low electric resistance and are exposed to high temperatures.
Since high spalling resistance and erosion due to the flow of molten steel, high corrosion resistance is required. Therefore, in the furnace bottom electrode, a furnace bottom electrode member containing carbon such as MgO-C quality, Al 2 O 3 -C quality, etc. is used in the electrical conduction part, and heating and melting treatment of steel and slag are performed while energizing. There are cases. When the electric resistance value of the furnace bottom electrode member is high, there is a problem that desired energization cannot be obtained and heat is generated due to the electric resistance inside the furnace bottom electrode member to deteriorate the durability of the refractory.
【０００３】前記炉底電極部材に焼成しないものを用い
た場合には、使用開始時の電気抵抗が高く、上記の問題
が生じる。これらの問題に対処するために、MgO-C質やA
l2O3-C質等については、予め還元雰囲気で焼成する処理
が一般に行われている。When a non-fired material is used as the furnace bottom electrode member, the electric resistance at the start of use is high and the above-mentioned problems occur. To address these issues, MgO-C quality and A
For l 2 O 3 -C quality and the like, a treatment of firing in a reducing atmosphere in advance is generally performed.
【０００４】これらの炭素を含有する炉底電極部材には
バインダーとして樹脂が使用されているが、これが炉底
電極部材内の電気伝導を妨げている。還元焼成すること
で、樹脂バインダーが熱分解して電気抵抗の小さい炭素
に変化する。その結果、炉底電極部材の導電性が改善さ
れ、電気抵抗値が小さくなる。A resin is used as a binder for the furnace bottom electrode member containing these carbons, and this hinders electric conduction in the furnace bottom electrode member. By the reduction firing, the resin binder is thermally decomposed and converted into carbon having a low electric resistance. As a result, the conductivity of the furnace bottom electrode member is improved and the electric resistance value is reduced.
【０００５】従来の技術として、直流電気炉の炉底電極
部材の導電性については、「耐火物」(47(9)1995の頁45
0〜456)に以下の記載がなされている。「MgO-Cれんが
（黒鉛含有）の比抵抗は予備加熱の有無で変わり、成形
されたれんがの比抵抗は、加熱温度が上がるとともに低
下し、800℃以上では、ほぼ一定値をとるようになる。
そして、この値は、その後の冷却過程においても変化し
ない。また、一旦加熱された試料は加熱中、冷却中とも
に、比抵抗の変化はほとんどない。」また、「これは、
バインダーであるフェノールレジンの炭化程度に依存し
ている。」という記載もなされている。即ち、従来の黒
鉛とフェノールレジンを使用するMgO-Cれんがにおいて
は、電気抵抗値を減少させるために高温での熱処理が必
要であることが判る。As a conventional technique, the conductivity of the bottom electrode member of a DC electric furnace is described in "Refractory" (47 (9) 1995, page 45).
The following description is made in 0-456). "The specific resistance of MgO-C brick (containing graphite) changes depending on the presence or absence of preheating, and the specific resistance of the molded brick decreases as the heating temperature increases, and it becomes almost constant at 800 ° C or higher. .
And this value does not change in the subsequent cooling process. Further, the once-heated sample hardly changes in specific resistance during heating and during cooling. "Also, this is
It depends on the degree of carbonization of the binder, phenolic resin. Is also described. That is, it can be seen that in MgO-C bricks using conventional graphite and phenolic resin, heat treatment at high temperature is necessary to reduce the electric resistance value.
【０００６】[0006]
【発明が解決しようとする課題】しかし、電極部材の還
元焼成処理には多量のエネルギーと労力を必要とし、コ
ストが増大するため好ましくない。本発明者らはこの課
題を解決する手段として、不焼成でありながら導電性に
優れる電極部材（炉底電気部材）の開発を意図して鋭意
研究を重ねた結果、本発明を完成した。However, the reduction firing treatment of the electrode member requires a large amount of energy and labor, and the cost is increased, which is not preferable. As a means for solving this problem, the present inventors have completed the present invention as a result of earnestly researching with the intention of developing an electrode member (furnace bottom electric member) which is not fired but has excellent conductivity.
【０００７】本発明の課題（目的）は、耐用性を維持し
つつ還元焼成処理を必要とせず、且つ、低コストで導電
性に優れる電気炉に使用できる炉底電極部材を提供する
ことにある。An object (object) of the present invention is to provide a furnace bottom electrode member which can be used in an electric furnace which does not require reduction firing treatment while maintaining durability and is low in cost and excellent in electrical conductivity. .
【０００８】[0008]
【課題を解決するための手段】前記課題を解決するため
に、電気炉に使用される電極部材において、該電極部材
が耐火性原料と炭素質原料からなる原料配合物で構成さ
れ、該炭素質原料が膨張黒鉛を含有する電極部材とす
る。（請求項１）
また、 前記電極部材は、不焼成の成形体からなり、電
気炉の炉底に配置される炉底電極部材とする。（請求項
２）
また、室温における電気比抵抗値が30×10-5Ωm以下で
あることを特徴とする。（請求項３）In order to solve the above-mentioned problems, in an electrode member used in an electric furnace, the electrode member is composed of a raw material mixture consisting of a refractory raw material and a carbonaceous raw material, The raw material is an electrode member containing expanded graphite. (Claim 1) Further, the electrode member is a furnace bottom electrode member made of an unfired molded body and arranged at the furnace bottom of an electric furnace. (Claim 2) Also, the electrical resistivity at room temperature is 30 × 10 −5 Ωm or less. (Claim 3)
【０００９】[0009]
【発明の実施の形態】以下、本発明について詳細に説明
する。本発明者らは、上記課題を解決するために鋭意検
討を行った結果、電極部材（炉底電極部材）に膨張黒鉛
を含有させることが有効であることを見い出した。薄片
状の形状的な特徴を有する膨張黒鉛を含有させることに
よって，炉底電極部材の組織中において黒鉛粒子同士の
直接接触する頻度が増大する。BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below. As a result of intensive studies to solve the above problems, the present inventors have found that it is effective to include expanded graphite in the electrode member (furnace bottom electrode member). Inclusion of expanded graphite having a flaky shape characteristic increases the frequency of direct contact between graphite particles in the structure of the furnace bottom electrode member.
【００１０】そのために、黒鉛粒子間の電気伝導が安定
的に確保され、電気抵抗値の高い樹脂バインダーの影響
を受けにくくなる。その結果、電気抵抗値の低い不焼成
の炉底電極部材を得ることができる。また、膨張黒鉛は
黒鉛本来の低熱膨張性や高熱伝導性といった特徴を有し
ているため、炉底電極部材に要求される耐食性，耐スポ
ーリング性といった特性を維持することができる。Therefore, the electric conduction between the graphite particles is stably ensured, and the influence of the resin binder having a high electric resistance value is suppressed. As a result, an unfired furnace bottom electrode member having a low electric resistance value can be obtained. In addition, since expanded graphite has characteristics such as low thermal expansion and high thermal conductivity inherent in graphite, it is possible to maintain the characteristics such as corrosion resistance and spalling resistance required for the furnace bottom electrode member.
【００１１】本発明で使用する膨張黒鉛は、鱗片状黒鉛
を酸処理して層方向に膨張，分割させ、薄片状の粒子と
したものが好適である。膨張黒鉛の含有量は本発明の意
図に沿う限りは特に限定されないが、原料配合物100重
量%に対して1重量%以上含むことが望ましい。また、該
原料配合物中の炭素質原料100重量％に対して少なくと
も10重量%以上含まれることが望ましい。これらの含有
量未満では、上記の作用が十分に得られない。また、膨
張黒鉛の含有量の上限は限定されず、炭素質原料の全て
が膨張黒鉛とすることもできる。The expansive graphite used in the present invention is preferably flaky graphite treated with an acid to expand and divide in the layer direction to form flaky particles. The content of the expanded graphite is not particularly limited as long as it is in accordance with the intention of the present invention, but it is preferable that the content of the expanded graphite is 1% by weight or more based on 100% by weight of the raw material mixture. Further, it is desirable to contain at least 10% by weight or more based on 100% by weight of the carbonaceous raw material in the raw material mixture. If the content is less than these, the above-mentioned effects cannot be sufficiently obtained. Further, the upper limit of the content of expanded graphite is not limited, and all of the carbonaceous raw material can be expanded graphite.
【００１２】なお、炭素を含有する耐火物への膨張黒鉛
の適用はこれまでにも実施されていて、その例として
は、特開昭59-203760号公報，特開平5-301772号公報，
特開平11-209169号公報，特開2000-319063号公報，特開
2001-72474項公報等に開示されている。The application of expanded graphite to carbon-containing refractories has been carried out up to now, and examples thereof include JP-A-59-203760 and JP-A-5-301772.
JP-A-11-209169, JP-A-2000-319063, JP-A
It is disclosed in paragraph 2001-72474.
【００１３】そして、特開昭59-203760号公報には、各
種冶金炉、耐熱性が要求される金属精錬設備に使用され
る鱗状黒鉛を配合した耐火物に関し、「黒鉛を５重量％
以上含有する耐火物について、該黒鉛含有量のうちの10
〜50重量％を積層面間距離を拡大する酸処理を施して得
られる海綿状黒鉛にしたことを特徴とする黒鉛含有耐火
物。」が記載されている。Japanese Patent Laid-Open No. 59-203760 discloses a refractory containing scaly graphite used in various metallurgical furnaces and metal refining equipment requiring heat resistance.
For the refractory containing above, 10 out of the graphite content
A graphite-containing refractory, characterized in that spongy graphite obtained by subjecting ~ 50% by weight of acid treatment to increase the distance between laminated surfaces is obtained. Is described.
【００１４】また、特開平5-301772号公報には、混銑
車、溶銑鍋、転炉、溶鋼鍋、電気炉などの各種溶融金属
容器の内張りに使用される炭素含有れんがに関し、特に
低カーボン領域での耐スポーリング性の低下する現象を
防止し、同時に耐食性も優れたれんがを得るために、
「炭素質材料として膨張黒鉛を含有することを特徴とす
る炭素含有れんが。」が記載されている。Further, JP-A-5-301772 discloses a carbon-containing brick used for lining various molten metal containers such as a mixing car, a hot metal ladle, a converter, a steel ladle and an electric furnace, and particularly in a low carbon region. In order to prevent the phenomenon that the spalling resistance decreases at the same time, and at the same time obtain a brick with excellent corrosion resistance,
"Carbon-containing brick characterized by containing expanded graphite as a carbonaceous material."
【００１５】また、特開平11-209169号公報には、耐ス
ポーリング性に優れた耐火れんがに関し、「粒径0.3mm
以下の膨張黒鉛を15〜40重量％、残部がマグネシアを主
体とする耐火材料からなることを特徴とする耐スポーリ
ング性に優れた耐火れんが」が記載されている。Further, Japanese Patent Application Laid-Open No. 11-209169 discloses a refractory brick excellent in spalling resistance, "particle size 0.3 mm.
A refractory brick excellent in spalling resistance, characterized in that it comprises 15 to 40% by weight of expanded graphite and the remainder is a refractory material mainly containing magnesia.
【００１６】また、特開2000-319063号公報には、マグ
ネシアー炭素質不焼成れんがに関し、耐スポーリング性
を向上させる「厚さ12μｍ以下の薄肉膨張黒鉛１〜12wt
％、粒径150メッシュ（タイラー上旬櫛）以下の炭化珪
素0.5〜10wt％，残部はマグネシアを主体とした耐火骨
材組成100wt％に、金属粉お呼び結合剤を添加して製造
されるマグネシアー炭素質不焼成れんが。」が記載され
ている。Further, Japanese Patent Laid-Open No. 2000-319063 discloses a magnesia carbonaceous non-fired brick which has a thickness of 1 to 12 wt.
%, Silicon carbide 0.5 to 10 wt% with a grain size of less than 150 mesh (Tyler early comb), and the balance is 100 wt% of a fire-resistant aggregate composition mainly composed of magnesia, and a magnesia carbonaceous material produced by adding a metal powder calling binder. Unfired brick. Is described.
【００１７】さらに、特開2001-72474号公報には、マグ
ネシアー炭素質不焼成れんがに関し、酸化防止および耐
スポーリング性を向上させる「薄肉膨張黒鉛１〜15重量
％，前記薄肉膨張黒鉛以外の炭素原料0〜10重量％，残
部をマグネシア主体とし、かつ薄肉膨張黒鉛を含めた前
記炭素原料の合量を15重量％以下とした耐火骨材100重
量部に、粒径0.1mm以下のアトマイズ型アルミニウム粉
１〜８重量部および結合剤を添加し、混練、成形後、加
熱乾燥して製造されるマグネシアー炭素質不焼成れん
が。」が記載されている。Further, Japanese Patent Laid-Open No. 2001-72474 relates to a magnesia carbonaceous non-fired brick "1 to 15% by weight of thin-wall expanded graphite, carbon other than the above-mentioned thin-wall expanded graphite, which improves oxidation resistance and spalling resistance. Atomized aluminum with a particle size of 0.1 mm or less in 100 parts by weight of a fire-resistant aggregate in which the raw material is 0 to 10% by weight, the balance is mainly magnesia, and the total amount of the carbon materials including the thin expanded graphite is 15% by weight or less. 1 to 8 parts by weight of powder and a binder are added, and the mixture is kneaded, molded, and then heated and dried to produce a magnesia carbonaceous unfired brick. "
【００１８】しかし、上記公報に開示されているもの
は、何れも黒鉛含有耐火物（れんが）に関するものであ
って、膨張黒鉛の使用の目的及びその効果は、耐火物と
しての材料の耐スポーリング性を向上させることにあ
る。However, all of the above-mentioned publications are related to graphite-containing refractory materials (brick), and the purpose and effect of using expanded graphite are as follows. Is to improve the sex.
【００１９】そして、上記公報には、本発明が意図する
ところの、炭素質原料に膨張黒鉛を含む材料を電気炉に
使用される電極部材として用いる点に関しては何等開示
されていない。したがって、上記各公報の炭素質原料に
膨張黒鉛を含む材料は、耐火物であって、電気材料（電
極部材）としては考慮されていないので、炭素質原料に
膨張黒鉛を含む材料の特性の測定において、電気特性
（特に電気比抵抗値）の測定は行われていず、またその
点を示唆する開示もなされていない。Further, the above publication does not disclose anything intended by the present invention to use a material containing expanded graphite as a carbonaceous raw material as an electrode member used in an electric furnace. Therefore, the material containing expanded graphite in the carbonaceous raw material in each of the above publications is a refractory and is not considered as an electric material (electrode member). Therefore, the characteristics of the material containing expanded graphite in the carbonaceous raw material are measured. In US Pat. No. 6,242,410, electrical characteristics (especially electrical resistivity value) have not been measured, and there is no disclosure suggesting this point.
【００２０】本発明に使用できる耐火性原料としては、
マグネシア，アルミナ，スピネル，カルシア，ドロマイ
ト，シリカ，クロミア，ジルコニア，チタニアなどの酸
化物やそれらの複合酸化物、または、それらの共存原料
あるいは電融原料，炭化珪素，窒化珪素，酸窒化珪素，
窒化硼素，炭化硼素，硼化ジルコニウム等の一般に使用
される耐火性原料を任意に使用することができ、いずれ
も本発明に包含されるものである。The refractory raw materials that can be used in the present invention include:
Oxides of magnesia, alumina, spinel, calcia, dolomite, silica, chromia, zirconia, titania, etc. and their complex oxides, or their coexisting or electromelting materials, silicon carbide, silicon nitride, silicon oxynitride,
Generally used refractory raw materials such as boron nitride, boron carbide, and zirconium boride can be optionally used, and all are included in the present invention.
【００２１】また、本発明に使用できる炭素質原料は、
特に限定されないが、一般に使用されるものとして鱗状
黒鉛，土状黒鉛などの天然黒鉛や、コークスなどの人造
黒鉛，電極屑，炭素繊維，熱分解炭素などを挙げること
ができる。また、上記の膨張黒鉛も炭素質原料に含まれ
るものである。この炭素質原料の使用量は、特に限定さ
れるものではないが、1〜40重量%の範囲内であることが
望ましい。The carbonaceous raw material which can be used in the present invention is
Although not particularly limited, commonly used materials include natural graphite such as scale graphite and earth graphite, artificial graphite such as coke, electrode scrap, carbon fiber, and pyrolytic carbon. In addition, the above expanded graphite is also included in the carbonaceous raw material. The amount of the carbonaceous raw material used is not particularly limited, but is preferably in the range of 1 to 40% by weight.
【００２２】炭素質材料の添加量が1重量%未満では、耐
スポーリング性が低下し、また、スラグ浸潤を防止する
効果が不十分となるため好ましくない。炭素質原料の使
用量が40重量%を越えると、酸化損傷による組織劣化や
摩耗損傷が起こりやすくなり、また、炉底電極部材の熱
伝導率が増大して溶融金属の温度低下をもたらすため好
ましくない。When the amount of the carbonaceous material added is less than 1% by weight, spalling resistance is lowered and the effect of preventing slag infiltration becomes insufficient, which is not preferable. When the amount of the carbonaceous raw material used exceeds 40% by weight, deterioration of the structure or wear damage due to oxidative damage is likely to occur, and the thermal conductivity of the furnace bottom electrode member is increased, which causes a decrease in the temperature of the molten metal, which is preferable. Absent.
【００２３】また、本発明では、耐火物への強度付与等
の目的で、必要に応じて金属を添加しても良い。本発明
で使用できる金属としては、シリコン，アルミニウム，
マグネシウム，チタン，クロム，ジルコニウムなど，あ
るいはそれらの合金や混合物を挙げることができる。そ
の添加量としては、期待する効果を十分得つつ、且つ、
れんが強度が過剰に高くならない範囲として、0.1〜5重
量%であることが望ましい。Further, in the present invention, a metal may be added, if necessary, for the purpose of imparting strength to the refractory. Metals that can be used in the present invention include silicon, aluminum,
Mention may be made of magnesium, titanium, chromium, zirconium, etc., or alloys or mixtures thereof. As the addition amount, while sufficiently obtaining the expected effect, and
It is desirable that the range is 0.1 to 5% by weight so that the strength of the brick does not become excessively high.
【００２４】（実施例）以下、本発明の実施例について
説明する。表１に示す内容にて炉底電極部材を作成し
た。混練、成形の後、200℃で熱処理して、供試サンプ
ルとした。作成したサンプルの電気抵抗を測定した。電
気抵抗の測定は、乾燥後のサンプルを30×30×150mmの
直方体に加工し、長さ方向が成形時の加圧方向と垂直に
なるように調整した。直方体の両端面に銀ペーストを塗
布し、白金線を接合して電極部とし、電流を流した際の
電位差を計測して電気比抵抗を求めた。また、得られた
サンプルの物理特性値も測定した。(Examples) Examples of the present invention will be described below. A furnace bottom electrode member having the content shown in Table 1 was prepared. After kneading and molding, heat treatment was performed at 200 ° C. to obtain a test sample. The electrical resistance of the prepared sample was measured. The electrical resistance was measured by processing the dried sample into a rectangular parallelepiped of 30 × 30 × 150 mm, and adjusting the length direction to be perpendicular to the pressing direction during molding. Silver paste was applied to both end faces of the rectangular parallelepiped, platinum wires were joined to form an electrode part, and the potential difference when a current was applied was measured to determine the electrical resistivity. The physical property values of the obtained sample were also measured.
【００２５】得られた結果を表１中に示す。実施例１，
２及び４は、炭素質原料として鱗片状黒鉛と膨張黒鉛の
両方を含むもので、実施例３は、炭素質原料として膨張
黒鉛のみを含むものである。また、比較例１〜３は、炭
素質原料として鱗片状黒鉛のみを含むものである。The results obtained are shown in Table 1. Example 1,
2 and 4 contain both flake graphite and expanded graphite as the carbonaceous raw material, and Example 3 contains only expanded graphite as the carbonaceous raw material. Moreover, Comparative Examples 1 to 3 contain only flake graphite as the carbonaceous raw material.
【００２６】本発明の実施例１〜４のサンプルの電気比
抵抗は、14〜25（×10-5Ωｍ）であるのに対して、比較
例１〜３のサンプルは45〜65（×10-5Ωｍ）であって、
いずれも30（×10-5Ωｍ）アートファイブ以上であっ
た。このように、膨張黒鉛を配合した本発明の実施例
は、比較例のサンプルに比べて何れも明らかに電気比抵
抗値が低くなっており、導電性に優れる不焼成の炉底電
極部材が得られていることがわかる。また、本願発明の
実施例である１〜４のサンプルは、見掛気孔率（％）及
び圧縮強さ(MPa)の物理特性値も比較例１〜３のサンプ
ルに対して問題のない値を示している。以上より、本発
明の炉底電極部材は、従来の電極部材のものと比較して
電気導電性に優れることが明らかである。The electrical resistivity of the samples of Examples 1 to 4 of the present invention is 14 to 25 (× 10 -5 Ωm), while the samples of Comparative Examples 1 to 3 are 45 to 65 (× 10 5 -5 Ωm),
All were more than 30 (× 10 -5 Ωm) Art Five. As described above, the examples of the present invention in which the expanded graphite is blended have clearly lower electric resistivity values than the samples of the comparative examples, and an unfired furnace bottom electrode member having excellent conductivity is obtained. You can see that it is being done. Further, the samples of Examples 1 to 4 which are the examples of the present invention have physical property values of apparent porosity (%) and compressive strength (MPa) which are no problem with respect to the samples of Comparative Examples 1 to 3. Shows. From the above, it is clear that the furnace bottom electrode member of the present invention is superior in electrical conductivity to that of the conventional electrode member.
【００２７】[0027]
【表１】 [Table 1]
【００２８】[0028]
【発明の効果】請求項１に記載の発明は、電気炉に使用
される電極部材において、該電極部材が耐火性原料と炭
素質原料からなる原料配合物で構成され、該炭素質原料
が膨張黒鉛を含有する電極部材とすることにより、電気
特性の優れた電極部材を得ることできる。また、請求項
２記載の発明では、電極部材を不焼成の成形体とし、電
気炉の炉底に配置される炉底電極部材とすることによっ
て、耐用性を維持しつつ還元焼成処理を必要とせず、且
つ、低コストで導電性に優れる炉底電極部材を得ること
ができる。また、請求項３に記載の発明では、前記電極
部材の室温における電気比抵抗値が30×10-5Ωm以下と
することにより電気伝導性が改善され，還元焼成処理を
必要としない低コストの炉底電極部材を得ることができ
るものであり，その工業的価値は大きい。According to the invention described in claim 1, in an electrode member used in an electric furnace, the electrode member is composed of a raw material mixture comprising a refractory raw material and a carbonaceous raw material, and the carbonaceous raw material is expanded. By using an electrode member containing graphite, an electrode member having excellent electrical characteristics can be obtained. In the invention according to claim 2, the electrode member is a non-fired molded body, and the furnace bottom electrode member is disposed at the furnace bottom of the electric furnace, so that reduction firing treatment is required while maintaining durability. In addition, it is possible to obtain a furnace bottom electrode member that is low in cost and excellent in conductivity. Further, in the invention according to claim 3, the electric conductivity is improved by setting the electric resistivity of the electrode member at room temperature to 30 × 10 −5 Ωm or less, and the reduction firing treatment is not required and thus the cost reduction is achieved. The bottom electrode member can be obtained, and its industrial value is great.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 花房 義和 東京都千代田区九段北四丁目１番７号 品 川白煉瓦株式会社内 Ｆターム(参考） 3K084 CA01 CA08 4K045 AA04 BA02 RB02 4K063 AA04 BA02 CA01 FA63 FA64 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Yoshikazu Hanafusa 4th, 7th, 9th North, Chiyoda-ku, Tokyo Kawashiro Brick Co., Ltd. F-term (reference) 3K084 CA01 CA08 4K045 AA04 BA02 RB02 4K063 AA04 BA02 CA01 FA63 FA64
Claims (3)
該電極部材が耐火性原料と炭素質原料からなる原料配合
物で構成され、該炭素質原料が膨張黒鉛を含有すること
を特徴とする電極部材。1. An electrode member used in an electric furnace, comprising:
An electrode member characterized in that the electrode member is composed of a raw material mixture comprising a refractory raw material and a carbonaceous raw material, and the carbonaceous raw material contains expanded graphite.
り、電気炉の炉底に配置される炉底電極部材であること
を特徴とする請求項１に記載の電極部材。2. The electrode member according to claim 1, wherein the electrode member is a furnace bottom electrode member formed of a non-fired molded body and arranged at the furnace bottom of an electric furnace.
m以下であることを特徴とする請求項１又は２に記載の
電極部材。3. The electrical resistivity at room temperature is 30 × 10 -5 Ω
It is m or less, The electrode member of Claim 1 or 2 characterized by the above-mentioned.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002127200A JP2003322479A (en) | 2002-04-26 | 2002-04-26 | Electrode member |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002127200A JP2003322479A (en) | 2002-04-26 | 2002-04-26 | Electrode member |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003322479A true JP2003322479A (en) | 2003-11-14 |
Family
ID=29541381
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002127200A Pending JP2003322479A (en) | 2002-04-26 | 2002-04-26 | Electrode member |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2003322479A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113340121A (en) * | 2021-06-08 | 2021-09-03 | 北京科技大学 | Graphite electrode of embedded magnesium carbon material |
-
2002
- 2002-04-26 JP JP2002127200A patent/JP2003322479A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113340121A (en) * | 2021-06-08 | 2021-09-03 | 北京科技大学 | Graphite electrode of embedded magnesium carbon material |
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