Investigation and modelling of the progression of zinc leaching from large sphalerite ore particles

Simple item page
dc.contributor.authorGhorbani, Yousef
dc.contributor.authorPetersen, Jochen
dc.contributor.authorBecker, Megan
dc.contributor.authorMainza, Aubrey Njema
dc.contributor.authorFranzidis,Jean-Paul
dc.date.accessioned2015-05-14T20:05:53Z
dc.date.available2015-05-14T20:05:53Z
dc.date.issued2013-01
dc.description.abstractX-ray Computed Tomography (CT) was used to follow the progression of Zn leaching in a number of individual sphalerite ore particles, which were subjected to a long-term simulated heap bioleaching environment. The ore was prepared by two different modes of comminution – HPGR at 90 bar and cone crusher – and individual particles were selected from three different size fractions. Investigation of the reacted fraction of Zn vs distance from the centre of each particle indicated that leaching from large particles leads to near complete conversion near the surface, but only partial conversion in the zones that are closer to the centre of particles. The cores of the cone-crushed particles show hardly any conversion at all, especially in the larger particle sizes. Mathematical analysis shows that leaching from the large particle does not follow the shrinking core model. It is shown that the progression can rather be described by a combined reaction-diffusion process progressing through the network of cracks and pores closer to the particle surface. Extent and depth of this network are a function of particle size and comminution method. A simplified rate model is proposed that describes the extent of leaching as a function of time in terms of a set of parameters that can all be related to just particle size and crushing mode.en_ZA
dc.identifier.apacitationGhorbani, Y., Petersen, J., Becker, M., Mainza, A. N., & (2013). Investigation and modelling of the progression of zinc leaching from large sphalerite ore particles. <i>Hydrometallurgy</i>, http://hdl.handle.net/11427/12807en_ZA
dc.identifier.chicagocitationGhorbani, Yousef, Jochen Petersen, Megan Becker, Aubrey Njema Mainza, and "Investigation and modelling of the progression of zinc leaching from large sphalerite ore particles." <i>Hydrometallurgy</i> (2013) http://hdl.handle.net/11427/12807en_ZA
dc.identifier.citationGhorbani Y, et al. 2013. Investigation and modelling of the progression of zinc leaching from large sphalerite ore particles. Hydrometallurgy, 131: 8-23. http://dx.doi.org/10.1016/j.hydromet.2012.10.004en_ZA
dc.identifier.issn0304386Xen_ZA
dc.identifier.ris TY - Journal Article AU - Ghorbani, Yousef AU - Petersen, Jochen AU - Becker, Megan AU - Mainza, Aubrey Njema AU - Franzidis,Jean-Paul AB - X-ray Computed Tomography (CT) was used to follow the progression of Zn leaching in a number of individual sphalerite ore particles, which were subjected to a long-term simulated heap bioleaching environment. The ore was prepared by two different modes of comminution – HPGR at 90 bar and cone crusher – and individual particles were selected from three different size fractions. Investigation of the reacted fraction of Zn vs distance from the centre of each particle indicated that leaching from large particles leads to near complete conversion near the surface, but only partial conversion in the zones that are closer to the centre of particles. The cores of the cone-crushed particles show hardly any conversion at all, especially in the larger particle sizes. Mathematical analysis shows that leaching from the large particle does not follow the shrinking core model. It is shown that the progression can rather be described by a combined reaction-diffusion process progressing through the network of cracks and pores closer to the particle surface. Extent and depth of this network are a function of particle size and comminution method. A simplified rate model is proposed that describes the extent of leaching as a function of time in terms of a set of parameters that can all be related to just particle size and crushing mode. DA - 2013-01 DB - OpenUCT DO - 10.1016/j.hydromet.2012.10.004 DP - University of Cape Town J1 - Hydrometallurgy LK - https://open.uct.ac.za PB - University of Cape Town PY - 2013 SM - 0304386X T1 - Investigation and modelling of the progression of zinc leaching from large sphalerite ore particles TI - Investigation and modelling of the progression of zinc leaching from large sphalerite ore particles UR - http://hdl.handle.net/11427/12807 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/12807
dc.identifier.urihttp://dx.doi.org/10.1016/j.hydromet.2012.10.004
dc.identifier.vancouvercitationGhorbani Y, Petersen J, Becker M, Mainza AN, . Investigation and modelling of the progression of zinc leaching from large sphalerite ore particles. Hydrometallurgy. 2013; http://hdl.handle.net/11427/12807.en_ZA
dc.languageengen_ZA
dc.publisherElsevieren_ZA
dc.publisher.departmentCentre for Bioprocess Engineering Research
dc.publisher.facultyFaculty of Engineering and the Built Environment
dc.publisher.institutionUniversity of Cape Town
dc.rightsCopyright Elsevier*
dc.sourceHydrometallurgyen_ZA
dc.source.urihttp://www.journals.elsevier.com/hydrometallurgy/
dc.titleInvestigation and modelling of the progression of zinc leaching from large sphalerite ore particlesen_ZA
dc.typeJournal Articleen_ZA
uct.subject.keywordslarge particlesen_ZA
uct.subject.keywordsmineral conversionen_ZA
uct.subject.keywordsshrinking core modelen_ZA
uct.subject.keywordsheap leachingen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceArticleen_ZA
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
Ghorbani 2013 01 Investigation and Modelling of the Progression of Zinc Leaching from Large Sphalerite Ore Particles.pdf
Size:
1.91 MB
Format:
Adobe Portable Document Format
Description:
Download
License bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
license.txt
Size:
1.72 KB
Format:
Item-specific license agreed upon to submission
Description:
Download
Collections
Journal Articles