Investigation of particles with high crack density produced by HPGR and its effect on the redistribution of the particle size fraction in heaps

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dc.contributor.authorGhorbani, Yousef
dc.contributor.authorPetersen, J
dc.contributor.authorBecker, Megan
dc.contributor.authorMainza, Aubrey Njema
dc.contributor.authorFranzidis, Jean-Paul
dc.contributor.authorKalala, JT
dc.date.accessioned2015-04-29T08:45:12Z
dc.date.available2015-04-29T08:45:12Z
dc.date.issued2013
dc.description.abstractThe application of comminution technology such as the High-pressure grinding rolls (HPGR), which is able to generate a high density of cracks in the ore particles, is favourable for leaching processes. Extraction of metallic values by the heap leach process, can take place on the particles with partial exposure of mineral grains, if it can provide sufficient surface front for chemical attack by leaching solution. The aim of this study was to assess the benefits of high crack density in the ore particles produced using the HPGR and how it could diminish due to inadequate percolation of the leaching agent. A zinc ore was comminuted using HPGR at three different pressure settings and with a cone crusher for the control experiment. Subsamples from the (+23/-25, +14/-16, +5.25/-6.75 mm) size fractions were characterized and packed into leach reactors. The reactors were stopped from time to time to investigate the progress of crack and micro-crack growth and its effect on metal extraction using the X-ray computed tomography (CT). The results are validated with those obtained using traditional techniques such as SEM and QEMSCAN. Investigation of the leach reactors residue indicated significant changes in the particle size distribution (PSD) of initial feed toward the fine size fraction. The residues from the reactors leaching the material prepared using the HPGR product contained more fine particles than the reactors, which were fed by cone crusher product. These differences were up to 10.3%.en_ZA
dc.identifier.apacitationGhorbani, Y., Petersen, J., Becker, M., Mainza, A. N., Franzidis, J., & Kalala, J. (2013). Investigation of particles with high crack density produced by HPGR and its effect on the redistribution of the particle size fraction in heaps. <i>Minerals Engineering</i>, http://hdl.handle.net/11427/12698en_ZA
dc.identifier.chicagocitationGhorbani, Yousef, J Petersen, Megan Becker, Aubrey Njema Mainza, Jean-Paul Franzidis, and JT Kalala "Investigation of particles with high crack density produced by HPGR and its effect on the redistribution of the particle size fraction in heaps." <i>Minerals Engineering</i> (2013) http://hdl.handle.net/11427/12698en_ZA
dc.identifier.citationGhorbani Y, Petersen J, Becker M, Mainza AN, Franzidis J-P and Kalala JT. (2013). Investigation of particles with high crack density produced by HPGR and its effect on the redistribution of the particle size fraction in heaps. Minerals Engineering , 43–44: 44–51. http://dx.doi.org/10.1016/j.mineng.2012.08.010en_ZA
dc.identifier.issn08926875en_ZA
dc.identifier.ris TY - Journal Article AU - Ghorbani, Yousef AU - Petersen, J AU - Becker, Megan AU - Mainza, Aubrey Njema AU - Franzidis, Jean-Paul AU - Kalala, JT AB - The application of comminution technology such as the High-pressure grinding rolls (HPGR), which is able to generate a high density of cracks in the ore particles, is favourable for leaching processes. Extraction of metallic values by the heap leach process, can take place on the particles with partial exposure of mineral grains, if it can provide sufficient surface front for chemical attack by leaching solution. The aim of this study was to assess the benefits of high crack density in the ore particles produced using the HPGR and how it could diminish due to inadequate percolation of the leaching agent. A zinc ore was comminuted using HPGR at three different pressure settings and with a cone crusher for the control experiment. Subsamples from the (+23/-25, +14/-16, +5.25/-6.75 mm) size fractions were characterized and packed into leach reactors. The reactors were stopped from time to time to investigate the progress of crack and micro-crack growth and its effect on metal extraction using the X-ray computed tomography (CT). The results are validated with those obtained using traditional techniques such as SEM and QEMSCAN. Investigation of the leach reactors residue indicated significant changes in the particle size distribution (PSD) of initial feed toward the fine size fraction. The residues from the reactors leaching the material prepared using the HPGR product contained more fine particles than the reactors, which were fed by cone crusher product. These differences were up to 10.3%. DA - 2013 DB - OpenUCT DO - 10.1016/j.mineng.2012.08.010 DP - University of Cape Town J1 - Minerals Engineering LK - https://open.uct.ac.za PB - University of Cape Town PY - 2013 SM - 08926875 T1 - Investigation of particles with high crack density produced by HPGR and its effect on the redistribution of the particle size fraction in heaps TI - Investigation of particles with high crack density produced by HPGR and its effect on the redistribution of the particle size fraction in heaps UR - http://hdl.handle.net/11427/12698 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/12698
dc.identifier.urihttp://dx.doi.org/10.1016/j.mineng.2012.08.010
dc.identifier.vancouvercitationGhorbani Y, Petersen J, Becker M, Mainza AN, Franzidis J, Kalala J. Investigation of particles with high crack density produced by HPGR and its effect on the redistribution of the particle size fraction in heaps. Minerals Engineering. 2013; http://hdl.handle.net/11427/12698.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.rightsCreative Commons Attribution 4.0 International (CC BY 4.0)*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en_ZA
dc.sourceMinerals Engineering
dc.source.urihttp://www.journals.elsevier.com/minerals-engineering/
dc.titleInvestigation of particles with high crack density produced by HPGR and its effect on the redistribution of the particle size fraction in heapsen_ZA
dc.typeJournal Articleen_ZA
uct.subject.keywordsheap leachingen_ZA
uct.subject.keywordshigh-pressure grinding rolls (HPGR)en_ZA
uct.subject.keywordscrack densityen_ZA
uct.subject.keywordsX-ray computed tomographyen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceArticleen_ZA
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