Interactions of mimic weathered pyrite surfaces (FeS2) with acidic culture media (0 K): An approach for (bio)leaching applications
In biohydrometallurgical processes, a mineral exhibits different oxidation phases due to the system's heterogeneity, especially in heap leach pads. Oxidation chemically modifies the mineral surface altering its interface, and thereby affecting the bacteria-mineral interaction, mineral reactivit...
Guardado en:
| Autores principales: | , , , |
|---|---|
| Formato: | JOUR |
| Materias: | |
| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_0304386X_v182_n_p128_Saavedra |
| Aporte de: |
| id |
todo:paper_0304386X_v182_n_p128_Saavedra |
|---|---|
| record_format |
dspace |
| spelling |
todo:paper_0304386X_v182_n_p128_Saavedra2023-10-03T15:20:09Z Interactions of mimic weathered pyrite surfaces (FeS2) with acidic culture media (0 K): An approach for (bio)leaching applications Saavedra, A. García-Meza, J.V. Cortón, E. González, I. Bacterial attachment Interfacial modifications Mineral-culture media interaction Pyrite oxidation Pyrite weathering Raman spectroscopy Bacteria Bioleaching Oxidation Pyrites Raman spectroscopy Weathering Bacterial attachment Culture media Interfacial modification Pyrite oxidation Pyrite weathering Sulfur compounds In biohydrometallurgical processes, a mineral exhibits different oxidation phases due to the system's heterogeneity, especially in heap leach pads. Oxidation chemically modifies the mineral surface altering its interface, and thereby affecting the bacteria-mineral interaction, mineral reactivity and leaching velocity. Given that the mineral can be found in different oxidation states in heap bioleaching processes, three oxidation conditions of FeS2, in which iron and/or sulfur related compounds are formed on the mineral surface were assayed. This paper studies the interaction between the modified surface of a sulfide mineral, FeS2, and 0 K culture medium, typically used in biomining processes. Chemical and electrochemical changes on surfaces were characterized by subjecting them to weathering in an acidic culture medium (pH 1.8), without applying potential or current. The chemical species formed were identified by Raman spectroscopy. The modified pyrite surfaces showed significant interfacial transformations upon immersion in the culture medium, and the formation of passive chemical species, such as elemental sulfur, jarosite, phosphates and oxides, were identified. These interfacial modifications are correlated with changes in the open circuit potential (OCP) values during immersion of pyrite and surface modified pyrites in 0 K culture medium. Electrochemical characterization showed a decrease in mineral oxidation capacity, which directly affects the extent of leaching and possibly, of the interaction with other elements participating in the process, such as microorganisms. To study the interactions among bacteria and the pyrite mineral suffering different surface modifications, the attachment of the bioleaching bacterium Leptospirillum sp. was evaluated. © 2018 Elsevier B.V. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_0304386X_v182_n_p128_Saavedra |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Bacterial attachment Interfacial modifications Mineral-culture media interaction Pyrite oxidation Pyrite weathering Raman spectroscopy Bacteria Bioleaching Oxidation Pyrites Raman spectroscopy Weathering Bacterial attachment Culture media Interfacial modification Pyrite oxidation Pyrite weathering Sulfur compounds |
| spellingShingle |
Bacterial attachment Interfacial modifications Mineral-culture media interaction Pyrite oxidation Pyrite weathering Raman spectroscopy Bacteria Bioleaching Oxidation Pyrites Raman spectroscopy Weathering Bacterial attachment Culture media Interfacial modification Pyrite oxidation Pyrite weathering Sulfur compounds Saavedra, A. García-Meza, J.V. Cortón, E. González, I. Interactions of mimic weathered pyrite surfaces (FeS2) with acidic culture media (0 K): An approach for (bio)leaching applications |
| topic_facet |
Bacterial attachment Interfacial modifications Mineral-culture media interaction Pyrite oxidation Pyrite weathering Raman spectroscopy Bacteria Bioleaching Oxidation Pyrites Raman spectroscopy Weathering Bacterial attachment Culture media Interfacial modification Pyrite oxidation Pyrite weathering Sulfur compounds |
| description |
In biohydrometallurgical processes, a mineral exhibits different oxidation phases due to the system's heterogeneity, especially in heap leach pads. Oxidation chemically modifies the mineral surface altering its interface, and thereby affecting the bacteria-mineral interaction, mineral reactivity and leaching velocity. Given that the mineral can be found in different oxidation states in heap bioleaching processes, three oxidation conditions of FeS2, in which iron and/or sulfur related compounds are formed on the mineral surface were assayed. This paper studies the interaction between the modified surface of a sulfide mineral, FeS2, and 0 K culture medium, typically used in biomining processes. Chemical and electrochemical changes on surfaces were characterized by subjecting them to weathering in an acidic culture medium (pH 1.8), without applying potential or current. The chemical species formed were identified by Raman spectroscopy. The modified pyrite surfaces showed significant interfacial transformations upon immersion in the culture medium, and the formation of passive chemical species, such as elemental sulfur, jarosite, phosphates and oxides, were identified. These interfacial modifications are correlated with changes in the open circuit potential (OCP) values during immersion of pyrite and surface modified pyrites in 0 K culture medium. Electrochemical characterization showed a decrease in mineral oxidation capacity, which directly affects the extent of leaching and possibly, of the interaction with other elements participating in the process, such as microorganisms. To study the interactions among bacteria and the pyrite mineral suffering different surface modifications, the attachment of the bioleaching bacterium Leptospirillum sp. was evaluated. © 2018 Elsevier B.V. |
| format |
JOUR |
| author |
Saavedra, A. García-Meza, J.V. Cortón, E. González, I. |
| author_facet |
Saavedra, A. García-Meza, J.V. Cortón, E. González, I. |
| author_sort |
Saavedra, A. |
| title |
Interactions of mimic weathered pyrite surfaces (FeS2) with acidic culture media (0 K): An approach for (bio)leaching applications |
| title_short |
Interactions of mimic weathered pyrite surfaces (FeS2) with acidic culture media (0 K): An approach for (bio)leaching applications |
| title_full |
Interactions of mimic weathered pyrite surfaces (FeS2) with acidic culture media (0 K): An approach for (bio)leaching applications |
| title_fullStr |
Interactions of mimic weathered pyrite surfaces (FeS2) with acidic culture media (0 K): An approach for (bio)leaching applications |
| title_full_unstemmed |
Interactions of mimic weathered pyrite surfaces (FeS2) with acidic culture media (0 K): An approach for (bio)leaching applications |
| title_sort |
interactions of mimic weathered pyrite surfaces (fes2) with acidic culture media (0 k): an approach for (bio)leaching applications |
| url |
http://hdl.handle.net/20.500.12110/paper_0304386X_v182_n_p128_Saavedra |
| work_keys_str_mv |
AT saavedraa interactionsofmimicweatheredpyritesurfacesfes2withacidicculturemedia0kanapproachforbioleachingapplications AT garciamezajv interactionsofmimicweatheredpyritesurfacesfes2withacidicculturemedia0kanapproachforbioleachingapplications AT cortone interactionsofmimicweatheredpyritesurfacesfes2withacidicculturemedia0kanapproachforbioleachingapplications AT gonzalezi interactionsofmimicweatheredpyritesurfacesfes2withacidicculturemedia0kanapproachforbioleachingapplications |
| _version_ |
1807315335383089152 |