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Suppression of pyrite oxidation by carrier microencapsulation using Silicon and Catechol

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Title: Suppression of pyrite oxidation by carrier microencapsulation using Silicon and Catechol
Authors: Jha, Rani Kumari Thakur Browse this author
Satur, Jacqueline Browse this author
Hiroyoshi, Naoki Browse this author →KAKEN DB
Ito, Mayumi Browse this author →KAKEN DB
Tsunekawa, Masami Browse this author →KAKEN DB
Keywords: acid mine drainage
carrier micro encapsulation
pyrite oxidation
Issue Date: 7-Dec-2011
Publisher: Taylor & Francis
Journal Title: Mineral Processing and Extractive Metallurgy Review: An International Journal
Volume: 33
Issue: 2
Start Page: 89
End Page: 98
Publisher DOI: 10.1080/08827508.2011.562946
Abstract: Acid mine drainage (AMD) is formed from the natural oxidation of sulfide minerals such as pyrite, FeS2. Prevention of acid mine drainage is very important and several techniques are currently being investigated for the treatment and abatement of AMD. This paper proposes carrier-microencapsulation (CME) using Si-catechol complex -Si(cat)3^[2-]- for preventing pyrite oxidation. In CME, the water soluble organic carrier- catechol and metal ion-Si makes a complex e.g., tris-catecholato complex of Si4+, which oxidatively decomposes on pyrite surface and forms a stable oxide or hydroxide e.g., Si(OH)4 or SiO2 layer on the pyrite surface as a protective coating against pyrite oxidation. To demonstrate the effect of CME using Si(cat)3^[2-] on pyrite oxidation, shaking-flask leaching experiments of pyrite without and with CME treatment were performed. Significant halt in pH drop was observed after the CME treatment of pyrite. The CME coating was found very effective even at low Si(cat)3^[2-] concentration of 1 mol m^[-3] and 5 mol m^[-3]. The amount of Fe and S leached were lower from the pyrite with CME treatment, indicating that CME using Si and catechol is effective in suppressing pyrite oxidation. The effect of pH and presence of microorganism were also evaluated. The CME coating was found very effective even in acidic pH range. The CME treatment suppressed pyrite oxidation even in the presence of iron oxidizing microorganism. Presence of Si and O on the residue pyrite surface in SEM-EDX analysis supported the sustainability of CME coating at acidic pH.
Rights: This is an Author's Accepted Manuscript of an article published in Mineral Processing and Extractive Metallurgy Review: An International Journal, 33(2), 07 Dec 2011, pages 89-98, copyright Taylor & Francis, available online at:
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 恒川 昌美

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