Kinetics of Pressure Dissolution of Enargite in Sulfate-Oxygen Media

Padilla, R.; Rivas, Cinthya; Ruiz, M.C.

doi:10.1007/s11663-008-9151-9

Cited by 30 publications

(9 citation statements)

References 14 publications

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“…There are a few differences in the diagrams when compared to those previously published by Padilla et al (2008), namely the inclusions of the minerals olivenite (Cu 2 AsO 4 OH) and domeykite (Cu 3 As). There are also instances of curvature in the equilibrium lines which can only be determined through the mass-balanced calculation method.…”

Section: Introductionmentioning

confidence: 64%

Spectroelectrochemistry of enargite I: Reactivity in alkaline solutions

Gow¹,

Young

Huang

et al. 2015

Mining, Metallurgy & Exploration

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The presence of enargite (Cu 3 AsS 4) is problematic in gold processing because it is environmentally hazardous due to its arsenic content but also because it is refractory, causing both cyanide and oxygen consumption to increase. Selective leaching and treatment of the arsenic would prove advantageous prior to applying conventional gold leaching methods. The reactivity of enargite samples from Butte, Montana and Quiruvilca, Peru were spectroelectrochemically studied under alkaline conditions, pH range of 8-13, using Raman spectroscopy and cyclic voltammetry. Raman spectra of the surface were collected during and after voltammograms were potentially cycled in order to determine and compare surface species against theoretical E H-pH diagrams determined from mass-balanced thermodynamic calculations using StabCal software. Under slightly oxidizing conditions, covellite (CuS) peaks were found in a short matter of time, above ~100mV vs SHE for pH 9-13, suggesting arsenic leaching specifically occurred. At longer conditioning times, elemental sulfur was observed and tended to passivate the surface. The presence of elemental sulfur suggests that copper was eventually leached from the surface. By operating above pH 12, under slightly reducing conditions near-300mV vs SHE, arsenic can be selectively leached as thioarsenate (AsS 4 3-) or thiosulfate (AsO 4 3-) without sulfur formation.

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Section: Introductionmentioning

confidence: 64%

Spectroelectrochemistry of enargite I: Reactivity in alkaline solutions

Gow¹,

Young

Huang

et al. 2015

Mining, Metallurgy & Exploration

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“…This result indicates that the reaction (5) also occurs to a certain extent in the pressure leaching of enargite in FeSO 4 -H 2 SO 4 -O 2 , and the sulfur oxidizes further to sulfate at longer times; i.e. reaction (5) Padilla et al (2008) identified also a small amount of elemental sulfur in the leaching residues only at 160 °C, and at higher temperatures, they reported the formation of sulfate alone.…”

Section: Enargite Dissolution Reaction Pathwaymentioning

confidence: 91%

“…Padilla et al (2008) reported nearly total dissolution of enargite when using 64 µm size particles in 120 min at 220 °C and a partial pressure of oxygen of 689 kPa. Later, Ruiz et al (2011) reported a considerably improved rate of enargite dissolution in the pressure leaching of mixtures of enargite and pyrite minerals.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

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Kinetics of the pressure leaching of enargite in FeSO4–H2SO4–O2 media

2015

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“…El equilibrio S-H2O se presenta con líneas discontinuas y el equilibrio As-H2O como líneas discontinuas cortas. Extraído de Padilla et al (2008) Según Oyarzun y Oyarzun (2011), en los entornos mineros la intensidad del proceso de oxidación-lixiviación depende de tres factores principales: la proporción entre la pirita y otros sulfuros, el tipo de roca y el clima.…”

Section: 332-drenaje áCido De Minaunclassified

Caracterización y dispersión del material aerotransportado en el entorno de la antigua zona de minería metálica de Cartagena-La Unión: impactos y riesgos

Bisquert¹

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The general objective of this Doctoral Thesis has been to determine the presence or absence of material from non-confined mining and metallurgical residues present in the former mining district of Cartagena-La Unión, in the deposited and airborne atmospheric dust in the Mar Menor-Campo de Cartagena county, as well as its possible influence on the environmental health of the area. In order to reach this objective, three different types of samples have been sampled in which these materials can be found: atmospheric deposition, wind transport sediments and surface soils. Ten sampling stations were established for the three sample types. At each station, nine quarterly samples of deposition were taken, five quarterly samples of wind transport sediments and two samples of superficial soils were made. The sampling period for samples of

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Kinetics of Pressure Dissolution of Enargite in Sulfate-Oxygen Media

Cited by 30 publications

References 14 publications

Spectroelectrochemistry of enargite I: Reactivity in alkaline solutions

Spectroelectrochemistry of enargite I: Reactivity in alkaline solutions

Kinetics of the pressure leaching of enargite in FeSO4–H2SO4–O2 media

Caracterización y dispersión del material aerotransportado en el entorno de la antigua zona de minería metálica de Cartagena-La Unión: impactos y riesgos

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