Experimental leaching of atacamite, chrysocolla and malachite: Relationship between copper retention and cation exchange capacity

Helle, Sonia; Kelm, Ursula

doi:10.1016/j.hydromet.2005.03.005

Cited by 20 publications

(12 citation statements)

References 5 publications

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“…However, little quantitative research on the correlations between ore mineralogy, reaction chemistry and leach residue mineralogy has been reported (Watling 2006). Whittington and coworkers (2003a and b) placed a particular emphasis on the mineralogy of the residue in their study on pressure acid leaching of arid-region nickel laterite ore. Helle and Kelm (2005) also conducted several investigations on mineralogical changes during acid leaching of oxide copper ore. Marquez et al (2006) noted that an appropriate understanding of the mineralogy in the ore and its transformation is essential to design and operate any industrial system.…”

Section: Introductionmentioning

confidence: 99%

Relationship between bioleaching performance, bacterial community structure and mineralogy in the bioleaching of a copper concentrate in stirred-tank reactors

Spolaore

Joulian

Gouin

et al. 2010

Appl Microbiol Biotechnol

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Hugues. Relationship between bioleaching performance, bacterial community structure and mineralogy in the bioleaching of a copper concentrate in stirred-tank reactors. Applied Microbiology and Biotechnology, Springer Verlag, 2011, 89 (2) The experiments undertaken to produce the techno-economic data were also an opportunity to carry out more fundamental research. The objective of this work was to combine the results of the bioleaching experiments, in terms of copper recovery, with the results of bacterial community monitoring and mineralogy residue analysis.Batch and continuous bioleaching tests were carried out with 10% solids, at 42 °C and with a pH between 1.2 and 1.6. Final copper recovery was higher in batch cultures than in continuous mode (>95% vs. 91%). Mineralogical analysis showed that the limiting factor for copper recovery was incomplete chalcopyrite dissolution in both cases. However, chalcopyrite was even less dissolved in continuous conditions. This was also related to a variation in bacterial community structure. The population in all tests was composed of Acidithiobacillus caldus, Leptospirillum ferriphilum and one or two species of Sulfobacillus (thermosulfidooxidans and sometimes benefaciens) but Sulfobacillus and more generally sulphur oxidizers were more represented in batch mode.It was proposed that, due to their capacity to reduce inorganic compounds, sulphur oxidizers may be efficient in limiting chalcopyrite surface hindering. It may help to better dissolve this mineral and reach a better copper recovery.

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Section: Introductionmentioning

confidence: 99%

Relationship between bioleaching performance, bacterial community structure and mineralogy in the bioleaching of a copper concentrate in stirred-tank reactors

Spolaore

Joulian

Gouin

et al. 2010

Appl Microbiol Biotechnol

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“…For their part, Helle and Kelm [52] studied leaching with sulfuric acid, focusing on the retention of copper by the reactive gangue. Gangue minerals can considerably affect acid consumption and copper recovery and change the acid requirements in different unit operations [53,54].…”

Section: Effect Of Ore Mineralogy On Copper Heap Leaching Performancementioning

confidence: 99%

“…The reactivity of the gangue mainly results in acid consumption, loss of permeability, exchange, and absorption of copper, and finally, retention of copper in a pile [52], where the acid consumption is considered as the main economic factor for oxidized minerals [55]. For instance, carbonates (such as calcite) in copper oxide mineral deposits can cause a high increase in acid consumption.…”

Section: Effect Of Reactive Gangue On Copper Leachingmentioning

confidence: 99%

“…The microorganisms are responsible for providing sulfuric acid for proton attack and keeping the iron in an oxidized ferric state for the oxidative attack, knowing that ferric For their part, Helle and Kelm [52] studied leaching with sulfuric acid, focusing on the retention of copper by the reactive gangue. Gangue minerals can considerably affect acid consumption and copper recovery and change the acid requirements in different unit operations [53,54].…”

Section: Effect Of Iron-bearing Minerals On Copper Heap Leachingmentioning

confidence: 99%

“…However, together with mordenite, the latter is the clay species that most retains copper and acid. In a study by Helle and Kelm [52], the effect of gangues and clay minerals in the leaching of copper oxides was evaluated. Three groups of smectites (SAZ, NAU, and BENT Rock) were identified, with the mordenite having the highest copper retention percentage (Figure 5).…”

Section: Effect Of Clay Minerals On Copper Heap Leachingmentioning

confidence: 99%

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Gangues and Clays Minerals as Rate-Limiting Factors in Copper Heap Leaching: A Review

Toro

Ghorbani

Turan

et al. 2021

Metals

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Heap leaching is a firm extractive metallurgical technology facilitating the economical processing of different kinds of low-grade ores that are otherwise not exploited. Nevertheless, regardless of much development since it was first used, the process advantages are restricted by low recoveries and long extraction times. It is becoming progressively clear that the selection of heap leaching as an appropriate technology to process a specific mineral resource that is both environmentally sound and economically feasible very much relies on having an ample understanding of the essential underlying mechanisms of the processes and how they interrelate with the specific mineralogy of the ore body under concern. This paper provides a critical overview of the role of gangues and clays minerals as rate-limiting factors in copper heap leaching operations. We aim to assess and deliver detailed descriptions and discussions on the relations between different gangues and clays minerals and their impacts on the operational parameters and chemical dynamics in the copper heap leaching processes.

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Pleistocene recycling of copper at a porphyry system, Atacama Desert, Chile: Cu isotope evidence

et al. 2010

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Artículo de publicación ISIWe present Cu isotope data of hypogene and supergene minerals from the Late Paleocene Spence Cu-Mo porphyry in the Atacama Desert of northern Chile. Chalcopyrite displays a restricted range of δ65Cu values within the values reported for primary porphyry Cu sulfides (+0.28‰ to +0.34‰, n=6). Supergene chalcocite samples show heavier and remarkably homogeneous δ65Cu values, between +3.91‰ and +3.95‰ (n=6), consistent with previous models of Cu leaching and enrichment in porphyry systems. Secondary Cu minerals from the oxide zone show a wider range of composition, varying from +1.28‰ and +1.37‰ for chrysocolla (n=6) to very light Cu isotope signatures reported for atacamite between -5.72‰ to -6.77‰ (n=17). These data suggest redox cycling of Cu during supergene enrichment of the Spence Cu deposit, characterized by a first stage of supergene chalcocite formation from acidic, isotopically-heavy leach fluids of meteoric origin down-flowing in a semi-arid climate (44 to ~ 15-9 Ma). Reworking of the initial supergene copper assemblage, during the Pleistocene, by rising neutral and chlorine-rich deep formation waters under well-established hyper-arid climate conditions lead to the formation of atacamite with extremely fractionated Cu compositions. Essentially coeval chrysocolla formed by dissolution of atacamite during short episodes of wetter climatic conditions occurring in the latest Pleistocene

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Experimental leaching of atacamite, chrysocolla and malachite: Relationship between copper retention and cation exchange capacity

Cited by 20 publications

References 5 publications

Relationship between bioleaching performance, bacterial community structure and mineralogy in the bioleaching of a copper concentrate in stirred-tank reactors

Relationship between bioleaching performance, bacterial community structure and mineralogy in the bioleaching of a copper concentrate in stirred-tank reactors

Gangues and Clays Minerals as Rate-Limiting Factors in Copper Heap Leaching: A Review

Pleistocene recycling of copper at a porphyry system, Atacama Desert, Chile: Cu isotope evidence

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