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Can hydrogen sulphide gas be produced during alkaline leach of enargitic copper concentrates?

Authordc.contributor.authorMontes-Atenas, Gonzalo 
Authordc.contributor.authorde Guevara, Rodrigo Ladrón 
Authordc.contributor.authorLizama-Allende, Katherine 
Authordc.contributor.authorValenzuela, F. 
Cita de ítemdc.identifier.citationHydrometallurgy, Volumen 184,
Abstractdc.description.abstract© 2019 Elsevier B.V. The usual answer to the question stated in the title of this manuscript would be a definitive no due to the high stability of dissolved sulphide ions in water under strong alkaline conditions; nevertheless, experimental results presented in this research shows the opposite. Two arsenic-bearing copper concentrates coming from two different Chilean mine sites were used to carry out alkaline sulphide leach experiments. One of them (Concentrate 1) exhibits a P 80 of 45 μm and 3.8% arsenic while the other (Concentrate 2) has a P 80 of 98 μm and 2.3% arsenic. The arsenic extractions at 60 and 90 °C after 2 h reaction for concentrates 1 and 2 are around 10 and 80% and 14 and 93%, respectively. More relevantly, notwithstanding the strong alkaline conditions used in the experiments, the production of toxic hydrogen sulphide gas was detected and measured in tests performed at 90 °C. The molar ratio between the arsenic leached and the formation of hydrogen sulphide is 20:1 an
Publisherdc.publisherElsevier B.V.
Type of licensedc.rightsAttribution-NonCommercial-NoDerivs 3.0 Chile
Link to Licensedc.rights.uri
Keywordsdc.subjectIndustrial and Manufacturing Engineering
Keywordsdc.subjectMetals and Alloys
Keywordsdc.subjectMaterials Chemistry
Títulodc.titleCan hydrogen sulphide gas be produced during alkaline leach of enargitic copper concentrates?
Document typedc.typeArtículo de revista
Indexationuchile.indexArtículo de publicación SCOPUS

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Attribution-NonCommercial-NoDerivs 3.0 Chile
Except where otherwise noted, this item's license is described as Attribution-NonCommercial-NoDerivs 3.0 Chile