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Inhibition of pyrite oxidation through forming biogenic K-jarosite coatings to prevent acid mine drainage production.
- Source :
-
Water Research . Mar2024, Vol. 252, pN.PAG-N.PAG. 1p. - Publication Year :
- 2024
-
Abstract
- • Biogenic K-jarosite coatings were synthesized to inhibit pyrite oxidation. • Coated pyrite can resist both chemical and biological oxidation. • Biogenic K-jarosite coatings were stable even when pH < 3. • It is a promising method to prevent AMD production. This study proposes a novel method by forming biogenic K-jarosite coatings on pyrite surfaces driven by Acidithiobacillus ferrooxidans (A. ferrooxidans) to reduce heavy metal release and prevent acid mine drainage (AMD) production. Different thicknesses of K-jarosite coatings (0.7 to 1.1 μm) were able to form on pyrite surfaces in the presence of A. ferrooxidans , which positively correlated with the initial addition of Fe2+ and K+ concentrations. The inhibiting effect of K-jarosite coatings on pyrite oxidation was studied by electrochemical measurements, chemical oxidation tests, and bio-oxidation tests. The experimental results showed that the best passivation performance was achieved when 20 mM Fe2+ and 6.7 mM K+ were initially introduced with a bacterial concentration of 4 × 108 cells·mL−1, reducing chemical and biological oxidation by 70 % and 98 %, respectively (based on the concentration of total iron dissolved into the solution by pyrite oxidation). Similarly, bio-oxidation tests of two mine waste samples also showed sound inhibition effects, which offers a preliminary demonstration of the potential applicability of this method to actual waste rock. This study presents a new perspective on passivating the oxidation of metal sulfide tailings or waste and preventing AMD. [Display omitted] [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00431354
- Volume :
- 252
- Database :
- Academic Search Index
- Journal :
- Water Research
- Publication Type :
- Academic Journal
- Accession number :
- 175637086
- Full Text :
- https://doi.org/10.1016/j.watres.2024.121221