JP2007537565A - 電熱還元炉用の黒鉛電極とその製造方法 - Google Patents
電熱還元炉用の黒鉛電極とその製造方法 Download PDFInfo
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Abstract
Description
Al2O3+3C=2Al+3CO (1)
によって要約できる方法が、2つの工程、即ち
2Al2O3+9C=Al4C3+6CO (2)
Al4C3+Al2O3=6Al+3CO (3)
で行われる。反応(2)は、1900〜2000℃の間の温度で生じる。現在のアルミニウム生産反応(3)は、2200℃以上の温度で行われ、反応速度は温度の上昇に伴い増加する。反応(2)と(3)に示す種に加えて、Al2Oを含む揮発性Al種が、反応(2)及び(3)で生じ、かつオフガスにより取り除かれる。回収されない限り、これら揮発性種は、アルミニウム収率の損失になる。反応(2)及び(3)共、吸熱性である。
か焼陽極コークスを5〜10mmの平均粒径とし、かつ混合物を形成すべくコールタールピッチ結合剤と陽極コークスを混合する工程、
ピッチ結合剤の軟化点近くの温度で、グリーン電極を形成すべく混合物から電極体を形成する工程、
炭化電極を形成すべく、ピッチ結合剤を固体コークスに炭化するため700〜1100℃の温度でグリーン電極を焼成する工程、および
炭化電極中の炭素原子を、黒鉛の結晶構造に組織化させるために十分な時間、2100〜2700℃の最終温度で熱処理によって炭化電極を黒鉛化する工程。
6mmの平均粒径を有する85%の陽極コークス及び15%のコールタールピッチを、150℃で強力なミキサ内で混合した。混合物を、次に冷却し、直径約600mm×長さ約2400mmのグリーン電極として押し出した。グリーン電極を、上記のように処理した。鋼生産用の黒鉛電極(GEsteel)並びにSoederberg電極と比較した、これらの電極(GEelectrothermic)の物理的性質を、表1に示す。
6mmの平均粒径を持つ80%の陽極コークスと20%のコールタールピッチを、150℃において強力なミキサ内で混合し、冷却し、直径約330mm×長さ約2100mmのグリーン円筒体として押し出した。該円筒体を、上記の電極と同様に処理した。黒鉛化後、各円筒体から3つの黒鉛ピンを作成し、電極ねじ筋と組み合わさるように、ねじ付き表面を有するダブルコーン形状に加工した。ピンと対応する電極の両方の物理的性質は、ほぼ互いに合致する。組み立てた電極カラムは、熱応力下でクラックを生じなかった。
Claims (23)
- 電熱還元炉において陽極用コークスから形成され、2700℃未満の黒鉛化温度で黒鉛化され、かつ0.1重量%未満の鉄を含有する成形黒鉛電極体を含む黒鉛電極。
- 前記電極体が、5μΩ・mを超える比電気抵抗率と、150W/m・K未満の熱伝導率を有する請求項1記載の黒鉛電極。
- 前記電極体が、約0.05重量%の鉄含有量を有する請求項1記載の黒鉛電極。
- アルミニウム、チタン、ケイ素、合金鉄、及びリンのいずれかを生産する電熱還元炉用に設定された請求項1記載の黒鉛電極。
- 機械的強度を増加し、かつその熱膨張係数を調整するために、前記電極体に組み込まれる炭素ナノ繊維の量を更に含む請求項1記載の黒鉛電極。
- 機械的強度を増加し、かつ熱膨張係数を調整すべく、前記電極体に組み込まれる炭素繊維を更に含む請求項1記載の黒鉛電極。
- 前記陽極用コークスが、5〜10mmの平均粒径を有する請求項1記載の黒鉛電極。
- 前記平均粒径が、5〜7mmである請求項7記載の黒鉛電極。
- アルミナの直接炭素還元炉において使用される請求項1記載の炭素電極。
- 5〜10mmの平均粒径と、0.5%未満の灰分を有し、ピッチ結合剤と混合され、かつ黒鉛電極を形成するために焼成及び黒鉛化されるグリーン電極に形成される陽極用コークス粒子を含む黒鉛電極生産における中間生成物。
- 請求項1に記載の黒鉛電極との組み合わせで、陽極用コークスから形成され、2700℃未満の黒鉛化温度で黒鉛化され、0.1重量%未満の鉄含有量を有し、かつ電極カラムを形成するための前記黒鉛電極体と組み合わさるように形成される黒鉛ピン。
- 電熱還元炉用の自焼成複合電極において、自焼成複合電極の中央カラムを形成すべく配置される請求項1記載の黒鉛電極。
- 以下の工程を含むことを特徴とする黒鉛電極を生産する方法。
か焼陽極コークスに、5〜10mmの平均粒径を提供し、かつ混合物を形成すべくコールタールピッチ結合剤と陽極コークスを混合する工程、
ピッチ結合剤の軟化点近くの温度で、グリーン電極を形成すべく混合物から電極体を形成する工程、
炭化電極を形成するため、ピッチ結合剤を固体コークスに炭化すべく700〜1100℃の温度でグリーン電極を焼成する工程、および
炭化電極中の炭素原子を、黒鉛の結晶構造に組織化させるために十分な時間、2100〜2700℃の最終温度で熱処理によって炭化電極を黒鉛化する工程。 - 2200〜2500℃の温度で黒鉛化する工程を更に含む請求項13記載の方法。
- 800℃〜1000℃の温度でグリーン電極を焼成する工程を含む請求項13記載の方法。
- 最終温度迄、1時間当たり1K〜5Kの昇温速度で、空気の相対的不存在においてグリーン電極を焼成する工程を含む請求項13記載の方法。
- 焼成後、電極の開放気孔中に追加のピッチコークスを堆積させるべく、コールタール又は石油ピッチによって少なくとも1回、電極を含浸させる工程と、各含浸工程の後に、追加の焼成を行う工程とを含む請求項13記載の方法。
- 混合物に油又は他の潤滑剤を添加し、かつ押し出しによってグリーン電極を形成する請求項13記載の方法。
- 成形型における成形によって、又は撹拌した型における振動成形によってグリーン電極を形成する工程を含む請求項13記載の方法。
- グリーン電極を形成する混合物に、比較的低い割合の炭素繊維又は炭素ナノ繊維を添加する工程を含む請求項13記載の方法。
- 黒鉛電極の最終形状を提供すべく、黒鉛化工程で形成した黒鉛化電極を加工する工程を更に含む請求項13記載の方法。
- か焼陽極コークスを、5〜7mmの平均粒径とすることを含む請求項13記載の方法。
- 請求項13に記載の方法により複数の黒鉛化電極を生産する工程と、黒鉛化電極とかみ合うように設定されたニップルを生産する工程と、黒鉛電極カラムを形成すべく、電極及びニップルと接続する工程を含む黒鉛電極カラムの生産方法。
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Application Number | Priority Date | Filing Date | Title |
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US57098404P | 2004-05-12 | 2004-05-12 | |
PCT/EP2005/005166 WO2006000276A1 (en) | 2004-05-12 | 2005-05-12 | Graphite electrode for electrothermic reduction furnaces, electrode column, and method of producing graphite electrodes |
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US (2) | US20050254545A1 (ja) |
EP (1) | EP1749121A1 (ja) |
JP (1) | JP2007537565A (ja) |
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- 2005-05-12 RU RU2006143767/02A patent/RU2374342C2/ru active
- 2005-05-12 EP EP05742947A patent/EP1749121A1/en not_active Ceased
- 2005-05-12 CN CNA2005800150050A patent/CN1950547A/zh active Pending
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Also Published As
Publication number | Publication date |
---|---|
EP1749121A1 (en) | 2007-02-07 |
RU2374342C2 (ru) | 2009-11-27 |
US20050254545A1 (en) | 2005-11-17 |
US20090000425A1 (en) | 2009-01-01 |
RU2006143767A (ru) | 2008-06-20 |
US7794519B2 (en) | 2010-09-14 |
WO2006000276A1 (en) | 2006-01-05 |
CN1950547A (zh) | 2007-04-18 |
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