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A review on the negative impact of different elements during cyanidation of gold and silver from refractory ores and strategies to optimize the leaching process

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dc.contributor.author Larrabure, G. es_PE
dc.contributor.author Rodríguez-Reyes, J.C.F. es_PE
dc.date.accessioned 2024-05-30T23:13:38Z
dc.date.available 2024-05-30T23:13:38Z
dc.date.issued 2021
dc.description This research was supported by the Phosagro/UNESCO/IUPAC Partnership in Green Chemistry for Life (Contract ). JCFRR acknowledges the support of 4500245048FONDECYT and the World Bank (Contract 106-2018).The participation of GL was possible through the Real Life Experience (RLE) program at UTEC. Karinna Visurraga is thanked for administrative support.
dc.description.abstract The ongoing depletion of gold and silver-containing ore deposits demands a shift towards the processing of more complex sources. Leaching of gold or silver from these sources, which are named refractory and are typically low-grade, can be complicated due to one or more of the following effects: (1) kinetic or thermodynamic impediments on cyanide diffusion or on the dissolution of minerals, (2) readsorption of leached gold or silver (preg-robbing), and (3) excessive cyanide consumption due to the presence of cyanicidal agents. This article reviews the occurrence of these effects as a function of the elemental composition and compiles strategies to overcome them. The first type of refractory behavior was found to be related to arsenic or antimony sulfides and sulfosalts, manganese oxides, permanganates, iron sulfides, oxides, and hydroxides, tellurides, as well as different sulfur-containing minerals. In general, most kinetic or thermodynamic impediments are addressed by performing intensive grinding and through oxidation processes for sulfides, such as roasting, pressure oxidation, chemical oxidation or biological oxidation. On the other hand, preg-robbing activity was described as common in ores that contain carbonaceous matter, silicates, and sulfides. Strategies to deal with preg-robbing ores often include the destruction or deactivation of the preg-robbing surface, or the addition of another adsorbent to compete with the preg-robber (carbon-in-leach). Finally, cyanicidal agents include sulfides and compounds containing base metals, mainly copper, iron, zinc, and nickel. In the case of sulfides, performing oxidation processes is common, while base metals often require one or more pre-leaching stages in which they can be partially removed from the ore prior to cyanidation. Even though this review intends to serve as a compendium of strategies directed at improving cyanidation processes depending on the nature of the elements present in a feed, a final discussion stressing the importance of developing ore-specific strategies is given. © 2021 Elsevier Ltd
dc.description.sponsorship Consejo Nacional de Ciencia, Tecnología e Innovación Tecnológica - Concytec
dc.identifier.doi https://doi.org/10.1016/j.mineng.2021.107194
dc.identifier.scopus 2-s2.0-85115787501
dc.identifier.uri https://hdl.handle.net/20.500.12390/2962
dc.language.iso eng
dc.publisher Elsevier Ltd
dc.relation.ispartof Minerals Engineering
dc.rights info:eu-repo/semantics/openAccess
dc.subject Silver
dc.subject Cyanicidal agent es_PE
dc.subject Cyanide leaching es_PE
dc.subject Gold es_PE
dc.subject Preg-robbing es_PE
dc.subject Refractory ore es_PE
dc.subject.ocde https://purl.org/pe-repo/ocde/ford#2.07.05
dc.title A review on the negative impact of different elements during cyanidation of gold and silver from refractory ores and strategies to optimize the leaching process
dc.type info:eu-repo/semantics/review
dspace.entity.type Publication
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