電気炉ダストリサイクリングのための炭材によるサブミクロン粒子の吸着特性  [in Japanese] Adsorption Property of Submicron Particles with Carbonaceous Materials for Recycling EAF Dust  [in Japanese]

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Abstract

鉄や亜鉛の金属を含有する電気炉ダストのリサイクルは十分ではない。現在電気炉ダストは冷却され回収されている。回収後のダストは半分が再加熱され,残りは廃棄処分され,エネルギーや環境問題となっている。したがって,JRCM より提案された炭材フィルタを用いる新しい処理プロセスが基礎的に研究された。主にフィルタ充填物を決定するために種々の炭化物が検討された。冷間実験において6 種類の炭化物を用い模擬電気炉ダストの吸着特性を調べた。その試料を平均粒子径300 nm の粒子が浮遊する流体中に吊し,天秤で吸着による重量変化を測定した。その結果,1) 重量増加は試料の違いに強く依存した。興味深いことにBET 比表面積が最大のRDF 炭化物は吸着量も最大で,BET 比表面積が最小の黒鉛は吸着量も最小であった。2) サブミクロン粒子の吸着は試料表面ではなく試料内部で生じた。3)BET 比表面積が大きく1 ~ 10μm の細孔径をもつ多孔質体が電気炉ダスト捕集に有効である。換言すれば、粒子捕集のための細孔は粒子より1 オーダー大きいサイズが有効的である。パイロットプラントで用いられたコークスのSEM 写真も結論の妥当性を示唆した。

Recovery and recycling of electric arc furnace (EAF) dust are not enough although containing iron and zinc as metallic resource. Conventionally the EAF dust is collected by a bag filter after being completely cooled down, and half of the dust collected is re-melted in the melting furnace such as the Wealz kiln and the other is treated by sanitary landfill. This re-melting method is quite energy- and time-consuming with environmental problems. Therefore, a new dust treatment process using a coke bed filter, proposed by JRCM (The Japan Research and Development Center for Metals), was fundamentally studied, in which various carbonaceous materials were mainly examined to determine a packed material of the filter. In the cold experiments, adsorb property of the simulated EAF dust was evaluated by using six carbonaceous materials; charcoal, graphite, EAF coke, BF coke, pitch coke and carbonized RDF (Refuse Derived Fuel). The sample was suspended under the flowing condition of particles with average diameter of 300 nanometer and its weight changes due to adsorption were monitored by a high-accuracy balance. As a result, 1) the weight increase depended strongly on a kind of samples. Interestingly, the carbonized RDF with largest BET specific area is most adsorbable and the graphite with smallest BET specific area is least. 2) The adsorption of submicron particles occurred within the sample, not on the surface. 3) a porous material having 1 to 10 μm in pore size with larger BET specific area is absolutely effective for collecting the EAF dust. In other words, the pore for collecting particles should have one-order-larger size than the particle. SEM observation of the coke used in the pilot plant also suggested the validation of the conclusion obtained.

Journal

  • Shigen-to-Sozai

    Shigen-to-Sozai 118(2), 95-100, 2002-02-25

    The Mining and Materials Processing Institute of Japan

References:  8

Codes

  • NII Article ID (NAID)
    10008012299
  • NII NACSIS-CAT ID (NCID)
    AN10062646
  • Text Lang
    JPN
  • Article Type
    ART
  • ISSN
    09161740
  • NDL Article ID
    6083589
  • NDL Source Classification
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL Call No.
    Z17-315
  • Data Source
    CJP  NDL  J-STAGE 
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