抄録
Silver-catalyzed bioleaching of enargite concentrate with three bacteria (Acidimicrobium ferrooxidans ICP, Sulfobacillus sibiricus N1, Acidithiobacillus caldus KU) and one archaeon (Ferroplasma acidiphilum Y) was conducted in order to elucidate the catalytic mechanism of silver sulfide in enargite bioleaching. Whereas Cu recovery remained relatively low (43%) and Fe dissolved completely without silver sulfide, Cu recovery was greatly enhanced (96%) and Fe dissolution was suppressed (29%) in the presence of 0.04% silver sulfide. In the latter case, 52% of the solubilized As was re-immobilized, in contrast to only 14% As re-immobilization in the former. The silver-catalyzed bioleaching (at 0.04% silver sulfide) proceeded at low redox potentials within the optimal range, which likely promoted enargite dissolution via formation of intermediate Cu2 S. XAFS analysis revealed that As was mainly immobilized as As(V), which was in agreement with the EPMA results detecting ferric arsenate passivation on some enargite grains. Furthermore, formation of trisilver arsenic sulfide (Ag3 AsS4) was detected by XRD and EPMA, covering the surface of enargite particles. An intermediate layer, consisting of (Cu,Ag)3 AsS4, was also observed between the enargite grain and trisilver arsenic sulfide layer, implying that Cu in enargite may be gradually substituted by solubilized Ag. Kinetic study suggested that these secondary minerals do not rate-limit the enargite dissolution. The overall mechanism of silver-catalyzed bioleaching of enargite concentrate will be proposed.
| 元の言語 | 英語 |
|---|---|
| ホスト出版物のタイトル | 22nd International Biohydrometallurgy Symposium |
| 編集者 | Wolfgang Sand, Kathrin Rubberdt, Franz Glombitza, Wolfgang Sand, Mario Vera Veliz, Sabine Willscher, Sabrina Hedrich, Axel Schippers |
| 出版者 | Trans Tech Publications Ltd |
| ページ | 273-276 |
| ページ数 | 4 |
| ISBN（印刷物） | 9783035711806 |
| DOI | |
| 出版物ステータス | 出版済み - 1 1 2017 |
| イベント | 22nd International Biohydrometallurgy Symposium, 2017 - Freiberg, ドイツ 継続期間: 9 24 2017 → 9 27 2017 |
出版物シリーズ
| 名前 | Solid State Phenomena |
|---|---|
| 巻 | 262 SSP |
| ISSN（電子版） | 1662-9779 |
その他
| その他 | 22nd International Biohydrometallurgy Symposium, 2017 |
|---|---|
| 国 | ドイツ |
| 市 | Freiberg |
| 期間 | 9/24/17 → 9/27/17 |
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All Science Journal Classification (ASJC) codes
- Atomic and Molecular Physics, and Optics
- Materials Science(all)
- Condensed Matter Physics
これを引用
Mechanism of silver-catalyzed bioleaching of enargite concentrate. / Oyama, Keishi; Hirajima, Tsuyoshi; Sasaki, Keiko; Miki, Hajime; Okibe, Naoko.
22nd International Biohydrometallurgy Symposium. 版 / Wolfgang Sand; Kathrin Rubberdt; Franz Glombitza; Wolfgang Sand; Mario Vera Veliz; Sabine Willscher; Sabrina Hedrich; Axel Schippers. Trans Tech Publications Ltd, 2017. p. 273-276 (Solid State Phenomena; 巻 262 SSP).研究成果: 著書/レポートタイプへの貢献 › 会議での発言
}
TY - GEN
T1 - Mechanism of silver-catalyzed bioleaching of enargite concentrate
AU - Oyama, Keishi
AU - Hirajima, Tsuyoshi
AU - Sasaki, Keiko
AU - Miki, Hajime
AU - Okibe, Naoko
PY - 2017/1/1
Y1 - 2017/1/1
N2 - Silver-catalyzed bioleaching of enargite concentrate with three bacteria (Acidimicrobium ferrooxidans ICP, Sulfobacillus sibiricus N1, Acidithiobacillus caldus KU) and one archaeon (Ferroplasma acidiphilum Y) was conducted in order to elucidate the catalytic mechanism of silver sulfide in enargite bioleaching. Whereas Cu recovery remained relatively low (43%) and Fe dissolved completely without silver sulfide, Cu recovery was greatly enhanced (96%) and Fe dissolution was suppressed (29%) in the presence of 0.04% silver sulfide. In the latter case, 52% of the solubilized As was re-immobilized, in contrast to only 14% As re-immobilization in the former. The silver-catalyzed bioleaching (at 0.04% silver sulfide) proceeded at low redox potentials within the optimal range, which likely promoted enargite dissolution via formation of intermediate Cu2 S. XAFS analysis revealed that As was mainly immobilized as As(V), which was in agreement with the EPMA results detecting ferric arsenate passivation on some enargite grains. Furthermore, formation of trisilver arsenic sulfide (Ag3 AsS4) was detected by XRD and EPMA, covering the surface of enargite particles. An intermediate layer, consisting of (Cu,Ag)3 AsS4, was also observed between the enargite grain and trisilver arsenic sulfide layer, implying that Cu in enargite may be gradually substituted by solubilized Ag. Kinetic study suggested that these secondary minerals do not rate-limit the enargite dissolution. The overall mechanism of silver-catalyzed bioleaching of enargite concentrate will be proposed.
AB - Silver-catalyzed bioleaching of enargite concentrate with three bacteria (Acidimicrobium ferrooxidans ICP, Sulfobacillus sibiricus N1, Acidithiobacillus caldus KU) and one archaeon (Ferroplasma acidiphilum Y) was conducted in order to elucidate the catalytic mechanism of silver sulfide in enargite bioleaching. Whereas Cu recovery remained relatively low (43%) and Fe dissolved completely without silver sulfide, Cu recovery was greatly enhanced (96%) and Fe dissolution was suppressed (29%) in the presence of 0.04% silver sulfide. In the latter case, 52% of the solubilized As was re-immobilized, in contrast to only 14% As re-immobilization in the former. The silver-catalyzed bioleaching (at 0.04% silver sulfide) proceeded at low redox potentials within the optimal range, which likely promoted enargite dissolution via formation of intermediate Cu2 S. XAFS analysis revealed that As was mainly immobilized as As(V), which was in agreement with the EPMA results detecting ferric arsenate passivation on some enargite grains. Furthermore, formation of trisilver arsenic sulfide (Ag3 AsS4) was detected by XRD and EPMA, covering the surface of enargite particles. An intermediate layer, consisting of (Cu,Ag)3 AsS4, was also observed between the enargite grain and trisilver arsenic sulfide layer, implying that Cu in enargite may be gradually substituted by solubilized Ag. Kinetic study suggested that these secondary minerals do not rate-limit the enargite dissolution. The overall mechanism of silver-catalyzed bioleaching of enargite concentrate will be proposed.
UR - http://www.scopus.com/inward/record.url?scp=85028965821&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85028965821&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/SSP.262.273
DO - 10.4028/www.scientific.net/SSP.262.273
M3 - Conference contribution
SN - 9783035711806
T3 - Solid State Phenomena
SP - 273
EP - 276
BT - 22nd International Biohydrometallurgy Symposium
A2 - Sand, Wolfgang
A2 - Rubberdt, Kathrin
A2 - Glombitza, Franz
A2 - Sand, Wolfgang
A2 - Veliz, Mario Vera
A2 - Willscher, Sabine
A2 - Hedrich, Sabrina
A2 - Schippers, Axel
PB - Trans Tech Publications Ltd
ER -