Galvanic microencapsulation: A novel technique to passivate pyrite and prevent acid mine drainage formation
| Project/Area Number |
17K12831
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Environmental engineering and reduction of environmental burden
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| Research Institution | Hokkaido University |
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Principal Investigator |
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| Project Period (FY) |
2017-04-01 – 2019-03-31
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| Project Status |
Completed (Fiscal Year 2018)
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| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2018: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2017: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
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| Keywords | Acid mine drainage / Pyrite / Passivation / galvanic effects / acid mine drainage / microencapsulation / pyrite / passivation / zero-valent iron / iron phosphate / zero-valent aluminum / galvanic interaction / pyrite oxidation / Galvanic interaction |
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| Outline of Final Research Achievements |
This research proposes “galvanic microencapsulation” as a novel technique to passivate pyrite and prevent acid mine drainage formation. The most important achievements of this study are as follows: (1) galvanic interaction was more extensive under acidic conditions, (2) zero-valent iron was better than zero-valent aluminium in suppressing pyrite oxidation, (3) addition of phosphate in pyrite and zero-valent iron system produced iron-phosphate coatings on pyrite that limited its oxidation, (4) phosphate-enhanced galvanic microencapsulation was successfully applied in a ball mill using grinding balls as source of dissolved Fe, (5) galvanic microencapsulation could be used to improve coal and pyrite separation during flotation, (6) ferric phosphate coatings on pyrite could be formed even under very acidic pH (1-3) even without zero-valent iron, and (7) a potentially new process was discovered to create iron phosphate coatings on pyrite using acid mine drainage rich in ferrous ions.
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| Academic Significance and Societal Importance of the Research Achievements |
The results are significant because galvanic microencapsulation could target pyrite and prevent acid mine drainage (AMD) formation. It could be applied to existing mineral processing plants using a ball mill. Finally, new ways to passivate pyrite using AMD and galvanic interaction were discovered.
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Report
(3 results)
Research Products
(22 results)
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[Journal Article] Arsenic, selenium, boron, lead, cadmium, copper, and zinc in naturally contaminated rocks: A review of their sources, modes of enrichment, mechanisms of release, and mitigation strategies2018
Author(s)
C.B. Tabelin, T. Igarashi, M. Villacorte-Tabelin, I. Park, E.M. Opiso, M. Ito, N. Hiroyoshi
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Journal Title
Science of The Total Environment
Volume: 645
Pages: 1522-1553
DOI
Related Report
Peer Reviewed / Int'l Joint Research
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