The role of iron-hydroxy precipitates in the passivation of chalcopyrite during bioleaching

Stott, Matthew B.; Watling, H.R.; Franzmann, P.D.; Sutton, David C.

doi:10.1016/s0892-6875(00)00095-9

Cited by 170 publications

(55 citation statements)

References 8 publications

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“…The type strain of Sb. thermosulfidooxidans (DSM 9293) failed to grow anaerobically with sulfur and ferric iron (data not shown), although growth of this strain anaerobically with ferric iron and glycerol has been reported (Stott et al, 2000). The enrichment culture from the ore heap sample, which appeared to contain only Sb.…”

Section: Moderate Thermophilesmentioning

confidence: 92%

“…Glycerol was also used with moderate thermophiles anaerobically to remove jarosite from a chalcopyrite concentrate residue, which had been previously partly leached during aerobic growth of the moderate thermophiles (Stott et al, 2000). The removal of jarosite, which was not complete, did not result in a higher yield of copper when the treated residue was leached again under aeration.…”

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confidence: 99%

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Iron solubilization during anaerobic growth of acidophilic microorganisms with a polymetallic sulfide ore

Norris

Gould

Ogden

2015

Minerals Engineering

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Citation: NORRIS, P.R., GOULD, O. and OGDEN, T.J., 2015. Iron solubilization during anaerobic growth of acidophilic microorganisms with a polymetallic sulfide ore. Minerals Engineering, 75, Additional Information:• This paper was accepted for publication in the journal Miner- AbstractAcidithiobacillus ferrooxidans at 30 °C and Sulfobacillus thermosulfidooxidans at 47 °C were selected from a preliminary screening of various acidophiles for their ferric iron reduction capacities during anaerobic, autotrophic growth on sulfur. The selected cultures were used with a polymetallic sulfide ore under anoxic conditions to demonstrate enhanced solubilization of iron during leaching in shaken flasks and enhanced removal of iron from laboratory ore-leaching columns, compared to leaching with continuous aeration. Oreassociated, ferric iron-rich precipitates, which were formed under previously oxidizing conditions, were a potential influence on extraction of target metals and percolation through ore columns and were available as the source of ferric iron for anaerobic sulfur oxidation. Over twice as much iron was removed by moderate thermophiles when anoxic phases were introduced during the leaching. Enhanced removal of iron and some improvement in extraction of base metals from ore fragments were also demonstrated with a selected ''Sulfolobus''-like strain during growth and leaching with alternating periods of aeration and anoxic conditions at 70 °C.

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Section: Moderate Thermophilesmentioning

confidence: 92%

mentioning

confidence: 99%

Iron solubilization during anaerobic growth of acidophilic microorganisms with a polymetallic sulfide ore

Norris

Gould

Ogden

2015

Minerals Engineering

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“…Jarosite precipitation can account for as much as 15% of all oxidised iron. Chalcopyrite ''passivation'' has been attributed to jarosite precipitation at the mineral surface (Stott et al, 2000), and the decline of copper extraction rates towards the end of the leach coincides with an increasing proportion of iron remaining in the solids as jarosite. However, as the gradual decline in copper leaching is marginal compared to the substantial precipitation of jarosite, it would appear that jarosite presents at worst a diffusion barrier rather than a passivating layer.…”

Section: Resultsmentioning

confidence: 99%

“…Chalcopyrite is the only sulphide mineral that does not respond well to mesophiles (Mehta and Murr, 1982), primarily because of its tendency to ''passivate'' at the high solution potentials (>600 mV vs. Ag/AgCl-- Hackl et al, 1995;Kametami and Aoki, 1985) that are commonly associated with mesophile leaching, although the exact nature of this passivation is still the subject of much debate (Kametami and Aoki, 1985;Dutrizac, 1989;Stott et al, 2000). However, thermophile microorganisms, such as Sulfolobus, Acidianus and Metallosphaera have been shown to leach chalcopyrite to high extractions at temperatures in the range 65-75°C (Konishi et al, 1999;Torres et al, 1995;Howard and Crundwell, 1999), both in shake flasks and stirred tanks.…”

Section: Introductionmentioning

confidence: 99%

Thermophilic heap leaching of a chalcopyrite concentrate

Petersen

Dixon

2002

Minerals Engineering

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Thermophiles have been shown to be the only micro-organisms to leach chalcopyrite successfully. Heap leaching may be a feasible alternative to conventional bio-reactors, providing a high temperature environment can be maintained within the heap without external heating.In the present study thermophilic heap leaching of a chalcopyrite concentrate coated onto inert support rocks (the GEOCOATe process) was studied in sets of small heated columns. The temperature was gradually increased to 70°C, while successively introducing various mesophile and thermophile cultures. Individual columns were dismantled after progressively longer leach periods and the residual concentrates analysed. Copper extractions in excess of 90% were achieved within 100 days.On the basis of head and residue analyses the rate of reaction heat generated was calculated. A comprehensive heap heat conservation model was used to determine whether the experimental temperatures can be achieved and maintained in a full scale heap. Results indicate that operating hot heaps successfully is possible within a certain range of process parameters.

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“…A number of microorganisms including Ramlibacter tataouinensis, Acidithiobacillus thiooxidans (Bobadilla et al, 2011), Acidithiobacillus ferrooxidans (Karavaiko et al, 1986), Acidithiobacillus caldus (Watling, et al, 2015), Acidiphilum species (spp.) (Parada et al), Leptospirillum ferriphilum (Fu et al, 2008), Sulfobacillus thermosulfidooxidans (Stott et al, 2000), Ferroplasma thermophilum, (Zhou et al, 2008) and Aspergillus niger (Aung et al, 2005) have been shown to have great potential to leach the minerals that are found in the country.…”

mentioning

confidence: 99%