Thermophilic heap leaching of a chalcopyrite concentrate

Petersen, Jochen; Dixon, David G.

doi:10.1016/s0892-6875(02)00092-4

Cited by 95 publications

(30 citation statements)

References 16 publications

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“…The heat and moisture can be conserved in the heap by manipulating the rates of solution irrigation onto the heap and air up flow in the heap (Kelly et al, 2008;Harvey et al, 2002;Dixon, 2000), and through the appropriate use of transparent plastic sheets. This method therefore allows the leaching of ore or concentrate using the low capital and operating costs of heap leaching but with the advantage of operating at a higher temperature for faster reaction kinetics (Petersen and Dixon, 2002). Additionally, this stage is required to reduce the consumption of cyanide by the copper and nickel.…”

Section: Introductionmentioning

confidence: 99%

Assessing a two-stage heap leaching process for Platreef flotation concentrate

2012

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Samples of low-grade flotation concentrate derived from Platreef ore were treated with a two-stage heap leach process to determine the potential to run this process parallel to to the convential concentrate-smelt-refine process for extracting platinum group metals, thereby adding value to the convential process via economic treatment of low-grade materials. Using bench-scale columns, a first stage bioleach achieved extractions of 91.1% Cu, 98.5% Ni and 83.5% Co in a space of 88 days at a temperature of 65°C. Samples of residual concentrate from this process were similarly treated via columns in a second stage leach using cyanide solution, achieving extractions of up to 96.5% Pd, 97.5% Au and 35% Pt in a space of 45 days at 50°C. Mineral liberation analysis of a sample of concentrate from the cyanide leach experiment revealed that the bulk of the remaining Pt was in the form of sperrylite which appeared to leach very slowly in cyanide solution. Further to this, analysis of the cyanide leachate solution showed high levels of thiocyanate

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Section: Introductionmentioning

confidence: 99%

Assessing a two-stage heap leaching process for Platreef flotation concentrate

2012

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“…Oxygen is often a limiting reagent in heap bioleaching processes of sulphide minerals and therefore aeration helps to increase leaching rates. It also could be a way to control the temperature in the heap as the leaching reactions are mostly exothermic (Petersen and Dixon, 2002b;Dixon, 2000).…”

Section: Po2mentioning

confidence: 99%

“…This is a , 2005). This finding is, of course, dependent on whether excessive heat is generated in a heap or whether heat retention is the key for maintaining desired high temperature conditions for chalcopyrite leaching, as indicated by the column tests by Petersen and Dixon (2002b). HotHeap™ is a biological heap leach operating philosophy coupled with an instrumentation and control system that maximizes heat conservation and thus bioleaching kinetics.…”

Section: Heat Transportmentioning

confidence: 99%

Heap leaching technology – current state, innovations and future directions: A review

Ghorbani

Franzidis

Petersen

2015

Mineral Processing and Extractive Metallurgy Review

101

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Heap leaching is a well-established extractive metallurgical technology enabling the economical processing of various kinds of low-grade ores, which could not otherwise be exploited. However, despite much progress since it was first applied in recent times, the process remains limited by low recoveries and long extraction times. It is becoming increasingly clear that the choice of heap leaching as a suitable technology to process a particular mineral resource, which is both environmentally sound and economically viable, very much depends on having a comprehensive understanding of the underlying fundamental mechanisms of the processes and how they interact with the particular mineralogy of the ore body under consideration. This paper provides an introduction to the theoretical background of various heap leach processes, offers a scientific and

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“…Kinetic data showed a good fit (Fig. 11) to the diffusion controlled model according to Equation (3) The dissolution of copper proceeded by the diffusion of Fe (III) as the lixiviant generated bio-genically, through the porous product layer possibly of the jarosite formed on the ore particles [10][11][12][13]. The rate constant values for the diffusion controlled bioleaching of copper with hyperthermophiles were obtained from Figure 11 as 0.0052, diffusion controlled model [5].…”

Section: Kinetics Of Chalcopyrite Bioleaching By Sulfolobusmentioning

confidence: 99%

“…It should be noted that one of the problems that has had to be overcome in the leaching of chalcopyrite was that, when using natural bacteria, a passivating layer Article published by EDP Sciences forms on the mineral surfaces that prevents further leaching [10][11][12][13]. This passivating layer could come from one or both of two sources: Fe(OH) 3 tends to form jarosite (KFe 3 (SO 4 ) 2 (OH) 6 ), which coats the unreacted material and forms a passivating layer and/or, the elemental sulfur formed in reaction (1), which also tends to coat the surface.…”

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confidence: 99%

Bioleaching of low grade granitic chalcopyrite ore by hyperthermophiles: Elucidation of kinetics-mechanism

Abhilash¹,

Ghosh²,

Pandey³

2015

Metall. Res. Technol.

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-The current work was off-shoot of an attempt to isolate a thermophilic pyritic sulfur degrading bacteria in selective medium from a coal mine dump. This thermophilic bacteria (archaea) classified as Sulfolobus was tested for its feasibility to bioleach copper from a low grade Indian chalcopyrite ore (0.3% copper). With its prevalent ability to preferentially attack pyrite (a major phase in the ore), bioleaching was investigated at various parameters of pH, pulp density (PD), particle size, and temperature. A reflective high 85% copper recovery was obtained using <50 µm particles at 20% (w/w) pulp density, pH 2.0, 75 • C in 30 days. The copper dissolution was facilitated by iron (III) available in the leach liquor because of bacterial oxidation of pyrite present in the ore under acidic conditions. The biogenically generated Fe (III) ions enhanced copper dissolution from the chalcopyrite ore. The bioleaching of copper appeared to follow chemical control kinetic model with the reaction of lixiviant-Fe (III) and acid on the surface of the solid. Phase identification by XRD and SEM study corroborated the above mechanism of copper leaching.

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Thermophilic heap leaching of a chalcopyrite concentrate

Cited by 95 publications

References 16 publications

Assessing a two-stage heap leaching process for Platreef flotation concentrate

Assessing a two-stage heap leaching process for Platreef flotation concentrate

Heap leaching technology – current state, innovations and future directions: A review

Bioleaching of low grade granitic chalcopyrite ore by hyperthermophiles: Elucidation of kinetics-mechanism

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