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2017 年度 実施状況報告書

ガルバニックマイクロエンカプセレーション―酸性鉱廃水の発生抑制のための新しい方法

研究課題

研究課題/領域番号 17K12831
研究機関北海道大学

研究代表者

タベリン カーリット  北海道大学, 工学研究院, 助教 (60626125)

研究期間 (年度) 2017-04-01 – 2019-03-31
キーワードgalvanic interaction / pyrite oxidation / acid mine drainage
研究実績の概要

The most important achievements of this study to date are as follows:
1. pH is an important parameter for galvanic interaction to occur; that is, the extent of this process is more substantial under slightly acidic conditions.
2. Between metallic aluminum and zero-valent iron, we observed that the latter was more effective in suppressing pyrite oxidation.
3. Addition of phosphate in the pyrite and zero-valent iron system produced iron-phosphate coatings on pyrite that limited its oxidation.
4. Formation of iron-oxyhydroxide precursor minerals like schwertmannite was observed between 3 and 4, which could be a promising way of forming protective coatings on pyrite.

現在までの達成度 (区分)
現在までの達成度 (区分)

2: おおむね順調に進展している

理由

Although suppression of pyrite oxidation occurred via galvanic interaction using metallic aluminum and zero-valent iron, this effect was only temporary because a protective coating was not formed. The biggest difficulty that we encountered was the strong effects of pH not only on galvanic interaction but also on the formation of the coating. To put it simply, acidic conditions favored galvanic interactions but limited coating formation. Similarly, higher pH enhanced the precipitation of metallic oxides that could be used as a coating material, but galvanic interaction became negligible. To solve this conundrum, we are planning to use phosphate to induce coating formation and also evaluate the potential of schwertmannite, an iron-oxyhydroxysulfate mineral stable under acidic conditions.

今後の研究の推進方策

We are evaluating the mechanisms involved in the suppression of pyrite oxidation by metallic particles and why coating formation was very limited. Our approach is to do batch leaching experiments coupled with electrochemical studies. Also, we are doing experiments to understand how phosphate and zero-valent iron suppressed the oxidation of pyrite. Finally, we are trying to evaluate whether it is possible to apply the phosphate and zero-valent iron system directly during ball milling to induce the formation of a hydrophilic coating on pyrite and limit its floatability during flotation. Finally, we are looking for other potential materials like bimetallic particles as well as coating materials like metal-phosphates and silicates, which are also sometimes stable under a wide range of pH.

次年度使用額が生じた理由

We did not buy a UV-Vis spectrophotometer as originally planned because we got one from another laboratory, so about 1 M JPY will be used for the procurement of a new flow-through column setup that will be used for stability tests of treated residues. The rest will be used to attend conferences and to buy consumables like filters, pipette tips, sampling bottles and sampling tubes as originally planned.

  • 研究成果

    (10件)

すべて 2018 2017

すべて 雑誌論文 (2件) (うち国際共著 2件、 査読あり 1件) 学会発表 (8件) (うち国際学会 7件、 招待講演 1件)

  • [雑誌論文] Suppression of the release of arsenic from arsenopyrite by carrier-microencapsulation using Ti-catechol complex2018

    • 著者名/発表者名
      I. Park, C.B. Tabelin, K. Magaribuchi, K. Seno, M. Ito, N. Hiroyoshi
    • 雑誌名

      Journal of Hazardous Materials

      巻: 344 ページ: 322-332

    • DOI

      https://doi.org/10.1016/j.jhazmat.2017.10.025

    • 査読あり / 国際共著
  • [雑誌論文] Simultaneous suppression of acid mine drainage formation and arsenic release by carrier-microencapsulation using aluminum-catecholate complexes2018

    • 著者名/発表者名
      I. Park, C.B. Tabelin, K. Seno, S. Jeon, M. Ito and N. Hiroyoshi
    • 雑誌名

      Chemosphere

      巻: In press ページ: In press

    • DOI

      10.1016/j.chemosphere.2018.04.088

    • 国際共著
  • [学会発表] Enhanced passivation of pyrite in phosphate solution using ferric-catechol complex and zero-valent iron2017

    • 著者名/発表者名
      C.B. Tabelin, X. Li, S. Seng, M. Kojima, T. Igarashi, M. Ito and N. Hiroyoshi
    • 学会等名
      14th International Symposium on East Asian Resources Recycling Technology and the Mining and Materials Processing Institute of Japan Fall Meeting
    • 招待講演
  • [学会発表] Attachment of iron oxyhydroxides on pyrite and its effects on pyrite oxidation2017

    • 著者名/発表者名
      S. Seng, C.B. Tabelin, Y. Kontani, M. Kojima, M. Ito and N. Hiroyoshi
    • 学会等名
      International Symposium on Earth Science and Technology
    • 国際学会
  • [学会発表] Suppression of pyrite oxidation using zero-valent iron powder2017

    • 著者名/発表者名
      S. Seng, C.B. Tabelin, M. Kojima, Y. Kontani, M. Ito, and N. Hiroyoshi
    • 学会等名
      International Symposium on Earth Science and Technology
    • 国際学会
  • [学会発表] A review of heterocoagulation and galvanic interaction of sulfide minerals2017

    • 著者名/発表者名
      S. Seng, M. Motoya, Y. Kontani, C.B. Tabelin, M. Ito and N. Hiroyoshi
    • 学会等名
      14th International Symposium on East Asian Resources Recycling Technology and the Mining and Materials Processing Institute of Japan Fall Meeting
    • 国際学会
  • [学会発表] Effects of aluminum-catechol complexes on pyrite oxidation2017

    • 著者名/発表者名
      I. Park, C.B. Tabelin, K. Seno, K. Magaribuchi, M. Ito and N. Hiroyoshi
    • 学会等名
      International Symposium on Earth Science and Technology
    • 国際学会
  • [学会発表] Carrier-microencapsulation using Al-catechol complex for suppressing arsenic release from arsenopyrite2017

    • 著者名/発表者名
      I. Park, K. Seno, K. Magaribuchi, C.B. Tabelin, M. Ito and N. Hiroyoshi
    • 学会等名
      14th International Symposium on East Asian Resources Recycling Technology and the Mining and Materials Processing Institute of Japan Fall Meeting
    • 国際学会
  • [学会発表] Heterocoagulation and galvanic interaction in mineral processing: A review2017

    • 著者名/発表者名
      S. Seng, C.B. Tabelin, M. Kojima, Y. Kontani, M. Ito and N. Hiroyoshi
    • 学会等名
      1st International KAMPAI Symposium on Sustainable Management of Resources and Environment in the 21st Century
    • 国際学会
  • [学会発表] Suppressive effects of aluminum-catechol complexes on the release of arsenic from arsenopyrite2017

    • 著者名/発表者名
      I. Park, C.B. Tabelin, K. Seno, K. Magaribuchi, M. Ito and N. Hiroyoshi
    • 学会等名
      1st International KAMPAI Symposium on Sustainable Management of Resources and Environment in the 21st Century
    • 国際学会

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公開日: 2018-12-17  

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