Investigation into the effect of mechanical activation on the leaching of chalcopyrite in a glycine medium

Khezri, Mohammad; Rezai, Bahram; Abdollahzadeh, Ali; Wilson, Benjamin P.; Molaeinasab, Mehdi; Lundström, Mari

doi:10.1016/j.hydromet.2020.105492

Cited by 13 publications

(3 citation statements)

References 28 publications

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“…In comparison, the formation of secondary covellite was demonstrated under HydroCopper ® process conditions at pH ≤ 1.4 by Lundström et al [66] in the absence of oxygen purging. Based on the experimental details provided, the molar ratio of Cu(II) to chalcopyrite was at least 6.56 compared to values of at least 4.74 for the study of Chaudhari et al [49] and 3.68 for that of Cai et al [58]; in all instances these ratios were well above the stoichiometric requirement for reaction (5), and as indicated earlier, well above the value of 0.237 used here.…”

Section: Copper Metathesissupporting

confidence: 61%

“…The nature of leach residues generated during the alkaline glycine leaching of chalcopyrite appears to be more complicated owing to the low extent of leaching found under the conditions studied, facilitating the formation of both neutral and basic copper-containing compounds [4]. A more recent study that examined the impact of mechanical activation upon the alkaline glycine leaching of chalcopyrite resulted in significantly greater copper extractions and produced leach residues that contained copper glycinate (Cu(NH 2 CH 2 COO) 2 ) which could be recovered, covellite, maghemite (γ-Fe 2 O 3 ) and quartz [5].…”

Section: Introductionmentioning

confidence: 99%

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The Effects of Chloride on the High Temperature Pressure Oxidation of Chalcopyrite: Some Insights from Batch Tests—Part 2: Leach Residue Mineralogy

McDonald

2023

Minerals

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The complete reaction of chalcopyrite at ≥220 °C under pressure oxidation conditions (10 or 20% w/w pulp density, PO2 700 kPa) is a clean process producing a residue consisting of hematite and un-reacted gangue minerals. However, when the process water contains chloride ions, covellite intermediate formation is significant and subsequently generates elemental sulphur that can persist for up to 60 min. Increasing the temperature to 230 °C reduces this time, although the dissolution of copper and the oxidation of sulphur still follows non-parallel reaction pathways. At 245 °C, the production of elemental sulphur in the presence of moderate chloride levels, 15 g/L, is no longer significant. The effects of other chemical additions (including enhancement of aluminium content) are also examined. Particular emphasis is given to the mineralogy of the leach residues and the deportment of iron in these residues to various phases that include hematite, basic ferric sulphate and natrojarosite. The residues are found to also contain a number of other intermediate phases in addition to covellite and sulphur, such as antlerite and clinoatacamite, depending upon the leach conditions employed.

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Section: Copper Metathesissupporting

confidence: 61%

Section: Introductionmentioning

confidence: 99%

The Effects of Chloride on the High Temperature Pressure Oxidation of Chalcopyrite: Some Insights from Batch Tests—Part 2: Leach Residue Mineralogy

McDonald

2023

Minerals

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“…A third alternative to enhance chalcopyrite leaching is mechanical activation, which consists in premilling the chalcopyrite concentrate in dedicated planetary mills using centimeter-sized balls . For instance, − various conditions of mechanochemical activation were investigated and all evidenced enhanced leaching of chalcopyrite, attributed to partial oxidation and rupture of the crystal lattice. Mechanistic studies from Bai et al and Li et al confirmed that this enhanced leaching process combines grain size reduction and modification of crystal and lattice properties through the formation of defects.…”

Section: Introductionmentioning

confidence: 99%

Hydrometallurgical Processing of Chalcopyrite by Attrition-Aided Leaching

Dakkoune

Bourgeois

et al. 2023

ACS Eng. Au

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We report the investigation of a chalcopyrite leaching process that implements millimeter-sized glass beads that are stirred in the leach reactor to combine particle grinding, mechanical activation, and surface removal of reaction products. The paper focuses on demonstrating the impact of the so-called attrition-leaching phenomenon on the leaching rate of a chalcopyrite concentrate and provides a first understanding of the underlying mechanisms. For this purpose, we have compared the copper leaching yield for different configurations under controlled chemical conditions (1 kg of glass beads and 84 g of chalcopyrite concentrate in 2.5 L of H2SO4-H2O solution, pH = 1.3, E h = 700 mV vs SHE, and T = 42 °C). On top of elemental analysis of the leach solution with time, we provide a full characterization of the solid residue based on X-ray diffraction, elemental analysis, and sulfur speciation. We demonstrate that glass beads led to a remarkable enhancement of the leaching rate in conditions where particles were already passivated by simple leaching and even when large amounts of solid products (elemental sulfur and jarosite) were present. An in-depth evaluation of particle size distribution showed that particle breakage occurred during a rather short time (a few hours) at the beginning of the runs, transforming the initial particles with d 4/3 = 30 μm to finer particles with d 4/3 = 15 μm. Then, particle breakage almost stopped, while an attrition phenomenon was evidenced, inducing the formation of very fine particles (<1 μm) and aggregates concomitantly with copper leaching.

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Selective gold extraction from electronic waste using high-temperature-synthesized reagents

Li,

Sun,

Wang

et al. 2023

Environ Sci Pollut Res

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Investigation into the effect of mechanical activation on the leaching of chalcopyrite in a glycine medium

Cited by 13 publications

References 28 publications

The Effects of Chloride on the High Temperature Pressure Oxidation of Chalcopyrite: Some Insights from Batch Tests—Part 2: Leach Residue Mineralogy

The Effects of Chloride on the High Temperature Pressure Oxidation of Chalcopyrite: Some Insights from Batch Tests—Part 2: Leach Residue Mineralogy

Hydrometallurgical Processing of Chalcopyrite by Attrition-Aided Leaching

Selective gold extraction from electronic waste using high-temperature-synthesized reagents

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