Mechanism of pyrite oxidation in copper(II)–ethylenediamine–thiosulphate gold leaching system

2021 ◽  
pp. 138752
Author(s):  
Yan Zhang ◽  
Futing Zi ◽  
Xianzhi Hu ◽  
Zhen Chen ◽  
Peng Yang ◽  
...  
Keyword(s):  
Pyrite Oxidation ◽  
Gold Leaching

scholarly journals Effect of Initial Cell Concentration on Bio-Oxidation of Pyrite before Gold Cyanidation

Minerals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 834
Author(s):  
Ka Yu Cheng ◽  
Caroline C. Rubina Rubina Acuña ◽  
Naomi J. Boxall ◽  
Jian Li ◽  
David Collinson ◽  
...  
Keyword(s):  
Performance Enhancement ◽  
Cell Concentration ◽  
Pyrite Oxidation ◽  
Pulp Density ◽  
Initial Cell Concentration ◽  
Gold Leaching ◽  
Initial Cell ◽  
Gold Ore ◽  
Commercial Scale ◽  
Pre Treatment

Bio-oxidation of refractory sulfidic gold minerals has been applied at the commercial scale as a pre-treatment to improve gold yields and reduce chemical consumption during gold cyanidation. In this study, the effect of initial cell concentration on the oxidation of pyritic gold ore was evaluated with four aerated bioreactors at 30 °C with 10% pulp density and pH maintained at 1.4 with NaOH. Results of NaOH consumption and changes in soluble Fe and S concentrations indicated that increasing the initial cell concentration from 2.3 × 107 to 2.3 × 1010 cells mL−1 enhanced pyrite oxidation during the first week. However, by day 18 the reactor with the lowest initial cell concentration showed profound performance enhancement based on soluble Fe and S concentrations, sulfide-S and pyrite contents in the residues, and subsequent gold leaching of the bio-oxidation residues by cyanidation. Overall, the results showed that the cell concentration was clearly beneficial during the initial stages of oxidation (first 7–8 days).

MICROBIALLY-MEDIATED PYRITE OXIDATION IN THE TUNNEL CITY GROUP AND WONEWOC FORMATION SANDSTONES OF TREMPEALEAU COUNTY, WI

2020 ◽  
Author(s):  
Lisa D. Haas ◽  
◽  
Eric Roden ◽  
Matthew Ginder-Vogel ◽  
James J. Zambito
Keyword(s):  
Pyrite Oxidation ◽  
City Group

Pyrite oxidation in carbonate-buffered solution: 2. Rate control by oxide coatings

1990 ◽  
Vol 54 (2) ◽  
pp. 395-402 ◽  
Author(s):  
R V. Nicholson ◽  
R.W Gillham ◽  
E.J Reardon
Keyword(s):  
Rate Control ◽  
Pyrite Oxidation ◽  
Oxide Coatings

Biofilm Formation, Communication and Interactions of Mesophilic Leaching Bacteria during Pyrite Oxidation

2013 ◽  
Vol 825 ◽  
pp. 107-110
Author(s):  
Sören Bellenberg ◽  
Robert Barthen ◽  
Mario Vera ◽  
Nicolas Guiliani ◽  
Wolfgang Sand
Keyword(s):  
Quorum Sensing ◽  
Acidithiobacillus Ferrooxidans ◽  
Biofilm Formation ◽  
Pyrite Oxidation ◽  
Cell Communication ◽  
Homoserine Lactone ◽  
Mixed Cultures ◽  
Acyl Homoserine Lactone ◽  
Leaching Bacteria ◽  
Leaching Efficiency

A functional luxIR-type Quorum Sensing (QS) system is present in Acidithiobacillus ferrooxidans. However, cell-cell communication among various acidophilic chemolithoautotrophs growing on pyrite has not been studied in detail. These aspects are the scope of this study with emphasis on the effects exerted by the N-acyl-homoserine lactone (AHL) type signaling molecules which are produced by Acidithiobacillus ferrooxidans. Their effects on attachment and leaching efficiency by other leaching bacteria, such as Acidithiobacillus ferrivorans, Acidiferrobacter spp. SPIII/3 and Leptospirillum ferrooxidans in pure and mixed cultures growing on pyrite is shown.

scholarly journals Effect of temperature and illumination on pyrite oxidation between pH 2 and 6

2000 ◽  
Vol 1 (1) ◽  
Author(s):  
Martin Schoonen ◽  
Alicia Elsetinow ◽  
Michael Borda ◽  
Daniel Strongin
Keyword(s):  
Pyrite Oxidation ◽  
Effect Of Temperature

Surface passivation model explains pyrite oxidation kinetics in column experiments with up to 11 bars p(O2)

2016 ◽  
Vol 75 (16) ◽  
Author(s):  
Marton Berta ◽  
Frank Dethlefsen ◽  
Markus Ebert ◽  
Karsten Gundske ◽  
Andreas Dahmke
Keyword(s):  
Oxidation Kinetics ◽  
Surface Passivation ◽  
Pyrite Oxidation ◽  
Column Experiments

Analysis of the surface proteins of Acidithiobacillus ferrooxidans strain SP5/1 and the new, pyrite-oxidizing Acidithiobacillus isolate HV2/2, and their possible involvement in pyrite oxidation

2011 ◽  
Vol 193 (12) ◽  
pp. 867-882 ◽  
Author(s):  
Andreas Klingl ◽  
Christine Moissl-Eichinger ◽  
Gerhard Wanner ◽  
Josef Zweck ◽  
Harald Huber ◽  
...  
Keyword(s):  
Acidithiobacillus Ferrooxidans ◽  
Pyrite Oxidation ◽  
Surface Proteins

Quantifying pyrite oxidation on continental shelves during the onset of Antarctic glaciation in the Eocene-Oligocene transition

2021 ◽  
Vol 568 ◽  
pp. 117015
Author(s):  
Weiqi Yao ◽  
Stefan Markovic ◽  
Adina Paytan ◽  
Andrea M. Erhardt ◽  
Ulrich G. Wortmann
Keyword(s):  
Pyrite Oxidation ◽  
Continental Shelves

scholarly journals Pyrite oxidation in acidic medium: overall reaction pathway

2008 ◽  
Vol 40 (3-4) ◽  
pp. 343-348 ◽  
Author(s):  
Frédéric Demoisson ◽  
Martine Mullet ◽  
Bernard Humbert
Keyword(s):  
Acidic Medium ◽  
Reaction Pathway ◽  
Pyrite Oxidation
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