Improvement of chalcopyrite atmospheric leaching using controlled slurry potential and additive treatments

Jafari, Mustafa; Karimi, Gholamreza; Ahmadi, Roya

doi:10.5277/ppmp170242

Cited by 2 publications

(2 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Based on these elements, we studied the impact of 1.2–1.6 mm glass beads at 400 g·L –1 on the leaching of a chalcopyrite concentrate in a sulfuric acid solution. These conditions are thus different from previous studies − , implementing smaller (<200 μm) and lower quantities (<50 g·L –1 ) of silica particles. According to the Pourbaix diagram for the CuFeS 2 -H 2 O system, to dissolve copper from chalcopyrite, a pH lower than 4 and a potential higher than 400 mV vs SHE are required.…”

Section: Introductioncontrasting

confidence: 94%

“…Dong et al also reported a noticeable improvement of copper bioleaching with 50 g·L –1 fine quartz particles (<43 μm) in the leach solution. Jafari et al added 10–40 g·L –1 silica particles (<200 μm) in the leaching reactor at 80 °C and observed a small improvement of leaching yield, together with a much cleaner grain surface at the microscopic scale. They concluded that the increase in copper yield was due to the combination of mechanical friction and collision that reduced the passive layers.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Hydrometallurgical Processing of Chalcopyrite by Attrition-Aided Leaching

Dakkoune

Bourgeois

et al. 2023

ACS Eng. Au

View full text Add to dashboard Cite

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.

show abstract

Section: Introductioncontrasting

confidence: 94%

Section: Introductionmentioning

confidence: 99%