Bioleaching of waste material from the Salobo mine, Brazil: Recovery of refractory copper from Cu hosted in silicate minerals

Henne, Anicia; Craw, Dave; Vasconcelos, Paulo; Southam, Gordon

doi:10.1016/j.chemgeo.2018.08.029

Cited by 25 publications

(18 citation statements)

References 54 publications

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“…However, bacterial mediation of the reaction can increase this rate by orders of magnitude and make it essentially instantaneous (Singer and Stumm, 1970; Langmuir, 1997; Henne et al , 2019a). If the overall biogeochemical environment has a circumneutral pH and some inherent neutralising capacity, this bacterially mediated acidification may be confined to the mineral grain scale where the oxidation is focussed (Langmuir, 1997; Mielke et al , 2003; Dockrey et al , 2014; Henne et al , 2018, 2019a,b) and result in micrometre-scale laminations at grain boundaries. Laminated precipitates in Figs 1a–e and 7e,f reflect these micrometre-scale, biologically mediated, localised variations in pH within bulk circumneutral pH.…”

Section: Discussionmentioning

confidence: 99%

“…In laboratory-scale weathering experiments of fresh rocks from the Salobo iron-oxide copper-gold (IOCG) deposit in Brazil, finely laminated metalliferous precipitates were produced within ∼400 days in a biogeochemical system dominated by Acidithiobacillus ferrooxidans, an acidophilic, iron-oxidising bacterium (Henne et al, 2018(Henne et al, , 2019a(Henne et al, , 2020. These experiments were conducted in small-scale (10 cm 3 ) polypropylene columns, partially filled with crushed, weakly mineralised rock.…”

Section: Laminated Precipitates In Laboratory Weathering Experimentsmentioning

confidence: 99%

“…The rocks were dominated by iron-bearing silicates with minor disseminated chalcopyrite and bornite. A strain of A. ferrooxidans was cultured from the Salobo mine site and used for the experiments, as described by Henne et al (2018, 2019a,b, 2020). Samples of the column solutions (2 mL) were obtained every two days and replaced with fresh growth medium to sustain active metabolic activity of bacteria.…”

Section: Descriptions Of Laminated Metalliferous Deposits In Differenmentioning

confidence: 99%

“…In laboratory-scale weathering experiments of fresh rocks from the Salobo iron-oxide coppergold (IOCG) deposit in Brazil, finely laminated metalliferous precipitates were produced within approximately 400 days in a biogeochemical system dominated by Acidithiobacillus ferrooxidans, an acidophilic, iron-oxidising bacterium (Henne et al, 2018(Henne et al, , 2020a.…”

Section: Laminated Precipitates In Laboratory Weathering Experimentsmentioning

confidence: 99%

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Biogeochemical formation of metalliferous laminations in surficial environments

Henne

Craw

Hamilton

et al. 2021

MinMag

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Finely laminated (cm–μm scale) metalliferous precipitates are widespread in the surficial environment, especially around mineral deposits and reflect biogeochemical processes that can pervade near-surface environments on a larger scale. Examples in this paper involve precipitates of the transition metals Fe, Cu and Mn with minor Co, Ni, V and Zn; the metalloids As and Sb; and authigenic Au. Mobility and re-precipitation are driven primarily by geochemical disequilibrium, especially with respect to pH and redox states, that arises from complex interactions between biological processes, geological processes, and variations in the surrounding environment. Different degrees of chemical disequilibrium arise on small spatial scales on time scales of days to millennia. Interactions between biota, waters and rocks in these small near-surface settings affect the biogeochemical environments. Sulfur- and iron-oxidising bacteria are common biogeochemical agents associated with sulfide-bearing lithologies, but localised reductive environments can also develop, leading to gradients in pH and redox state and differential metal mobility. In general, there is commonly a spatial separation of Fe-rich precipitates from those with Cu and Mn, and other transition metals also follow Cu and Mn rather than Fe. Metalloids As and Sb have a strong affinity for Fe under oxidising conditions, but not under more reducing conditions. However, complex biogeochemical parageneses of laminated metalliferous deposits preclude prediction of finer formation details. The textures, mineral species, and metal associations within these deposits are likely to be encountered in all facets of mineral deposit development: initial exploration activity of near-surface locations, mining of shallow portions of orebodies, especially supergene zones, and downstream environmental management with respect to discharging metalliferous waters.

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Section: Discussionmentioning

confidence: 99%

Section: Laminated Precipitates In Laboratory Weathering Experimentsmentioning

confidence: 99%

Section: Descriptions Of Laminated Metalliferous Deposits In Differenmentioning

confidence: 99%

Section: Laminated Precipitates In Laboratory Weathering Experimentsmentioning

confidence: 99%

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Biogeochemical formation of metalliferous laminations in surficial environments

Henne

Craw

Hamilton

et al. 2021

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“…Silicate minerals are common gangues associated with metal ores, and some literature studies report them as collectors (Henne et al, 2018;Hajati et al, 2019). All types and contents of silicate minerals are abundant in the Earth's crust and even moon rocks (Huebner and Dillenburg, 1995).…”

Section: Introductionmentioning

confidence: 99%

Flotation of Smithsonite From Quartz Using Pyrophyllite Nanoparticles as the Natural Non-toxic Collector

2021

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The use of natural hydrophobic mineral nanoparticles as a collector in froth flotation has recently attracted the attention of researchers. In this article, the separation performance and mechanism of pyrophyllite nanoparticles (PNPs) on smithsonite and quartz flotation system were investigated using the method of flotation, zeta potential, contact angle, and scanning electron microscope (SEM)/energy disperse spectroscopy (EDS). The results of single mineral flotation showed that the difference in flotation recovery between smithsonite and quartz was large for NaOL, DDA, and PNP collectors in the acidic pH range, the largest of which was the PNP system. At pH 6, the optimal dosage of PNPs was 1,000 mg/L. Separation of mixed minerals of smithsonite and quartz using a PNP collector provides the optimum concentrate index (Zn grade 50.84% and Zn recovery 85.36%). According to the results of zeta potential measurement, PNPs and quartz were negatively charged, and the surface of smithsonite was positively charged at pH 6. This provided conditions for smithsonite to selectively adsorb PNPs due to different electrostatic forces. Selective adsorption of PNPs in the smithsonite/quartz flotation system was directly observed by SEM/EDS detection. Hydrophobic PNPs were adsorbed on the surface of hydrophilic smithsonite to make it hydrophobic, and the surface of quartz remained hydrophilic. This is the mechanism for separating smithsonite and quartz using PNPs.

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