Bio-hydrometallurgy dynamics of copper sulfide-minerals probed by micro-FTIR mapping and Raman microspectroscopy
| Autor: | Constantinos Varotsis, Antonis Nicolaides, Anastasia Adamou |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Chalcocite
Leptospirillum ferriphilum 02 engineering and technology 010501 environmental sciences engineering.material 01 natural sciences 020501 mining & metallurgy chemistry.chemical_compound Bioleaching Bornite 0105 earth and related environmental sciences biology Chalcopyrite Mechanical Engineering Acidithiobacillus thiooxidans General Chemistry Covellite Geotechnical Engineering and Engineering Geology biology.organism_classification Copper sulfide 0205 materials engineering chemistry Chemical engineering Control and Systems Engineering visual_art visual_art.visual_art_medium engineering |
| Zdroj: | Minerals Engineering. 132:39-47 |
| ISSN: | 0892-6875 |
| DOI: | 10.1016/j.mineng.2018.11.038 |
| Popis: | We report the μm-FTIR mapping and Raman microspectroscopic detection of bornite [Cu5FeS4]-, chalcocite [Cu2S]-, and covelitte [CuS]- bacterial interactions by a consortium of microorganisms consisted of Acidithiobacillus ferrooxidans, Acidithiobacillus thiooxidans, Acidithiobacillus caldus, Leptospirillum ferriphilum, Leptospirillum ferroodiazotrophum and Sulfobacillus thermosulfidooxidans. The absorption signals of amide I, K+-jarosite [KFe3(SO4)2(OH)6] and of the produced extracellular polymeric substances (EPS) from the mixed culture as a function of position on the surfaces of the bioleached bornite, chalcocite and covellite demonstrated their heterogeneity within the surface of the minerals. This reveals the high level of biofilm, EPS, and jarosite biosynthesis on the surface of the minerals and might explain why they associate. To our knowledge this is the first combined application of μm-FTIR mapping and Raman microspectroscopy for the bioleaching behaviour of bornite, chalcocite and covellite and the comparison with other bioleached systems such as chalcopyrite [CuFeS2] provides valuable information on the whole bio-hydrometallurgy Cu/Fe/S system. Both techniques provide spectrally rich, label-free, nondestructive visualizations of the bio-hydrometallurgy dynamics of copper sulfide minerals for processing and storage of large spectral data sets which are valuable for evaluation of copper containing minerals. |
| Databáze: | OpenAIRE |
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