Kinetic study on HCN volatilization in gold leaching tailing ponds

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dc.citation.journalTitleMINERALS ENGINEERINGeng
dc.contributor.authorDobrosz-Gómez, I.
dc.contributor.authorRamos García, B.D.
dc.contributor.authorGilPavas, E.
dc.contributor.authorGómez García, M.Á.
dc.contributor.departmentUniversidad EAFIT. Departamento de Ingeniería de Procesosspa
dc.contributor.researchgroupDesarrollo y Diseño de Procesosspa
dc.date.accessioned2021-04-12T19:06:20Z
dc.date.available2021-04-12T19:06:20Z
dc.date.issued2017-08-15
dc.description.abstractIn this work, the detailed analysis of HCN volatilization, taking place in tailing storage facilities, was made. Volatilization experiments were performed at conditions typical of gold leaching industrial tailing ponds. The meticulous statistical analysis (including full factorial 33 experimental design) let to determine the variables and their interactions affecting the percentage of HCN volatilization. Volatilization tests were performed in an open, temperature-controlled, continuously-stirred batch reactor. The percentage of HCN volatilization was directly proportional to the temperature and temperature-pH interaction and inversely proportional to the pH, cyanide concentration, and pH-pH and temperature-cyanide concentration interactions. HCN volatilization was promoted at acidic conditions. A first order rate law was used to represent the volatilization rate. The specific rate constant (k) was found to be following function of temperature and pH: k(T,pH) = Ao.exp(-18760/T), where: In(A(0)) = (0.11 +/- 0.11)-pH + (58.08 +/- 0.16). The obtained kinetic model represented properly (R-2 = 0.90) experimental data in a wide range of industrial conditions: cyanide concentration (300-2000 mg.L-1), pH (3-9), and temperature (16-20 degrees C). The increase in temperature, from 16 to 20 C, let to the increase in k, by a factor of ca. 2.5 +/- 0.8. The increase in solution pH, from 3 to 9, provoked its decrease, by a factor of ca. 1.9 +/- 0.3.eng
dc.identifierhttps://eafit.fundanetsuite.com/Publicaciones/ProdCientif/PublicacionFrw.aspx?id=6734
dc.identifier.doi10.1016/j.mineng.2017.05.001
dc.identifier.issn8926875
dc.identifier.otherWOS;000403623200021
dc.identifier.otherSCOPUS;2-s2.0-85019601999
dc.identifier.urihttp://hdl.handle.net/10784/28254
dc.language.isoeng
dc.publisherElsevier Ltd
dc.relationDOI;10.1016/j.mineng.2017.05.001
dc.relationWOS;000403623200021
dc.relationSCOPUS;2-s2.0-85019601999
dc.relation.urihttps://www.scopus.com/inward/record.uri?eid=2-s2.0-85019601999&doi=10.1016%2fj.mineng.2017.05.001&partnerID=40&md5=bd590f00df84cfdccabf4b1dc9d3de49
dc.rightshttps://v2.sherpa.ac.uk/id/publication/issn/0892-6875
dc.sourceMINERALS ENGINEERING
dc.subjectHCN volatilizationeng
dc.subjectKinetic studyeng
dc.subjectGold leaching tailing pondseng
dc.titleKinetic study on HCN volatilization in gold leaching tailing pondseng
dc.typeinfo:eu-repo/semantics/article
dc.typeinfo:eu-repo/semantics/publishedVersion
dc.typeinfo:eu-repo/semantics/articleeng
dc.typearticleeng
dc.typeinfo:eu-repo/semantics/publishedVersioneng
dc.typepublishedVersioneng
dc.type.localArtículospa

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