Quantitative X-ray µCT Measurement of the Effect of Ore Characteristics on Non-Surface Mineral Grain Leaching

 

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dc.contributor.author Ghadiri, Mahdi
dc.contributor.author Harrison, Susan T L
dc.contributor.author Fagan-Endres, Marijke A
dc.date.accessioned 2021-06-23T13:01:38Z
dc.date.available 2021-06-23T13:01:38Z
dc.date.issued 2020-08-23
dc.identifier doi: 10.3390/min10090746
dc.identifier.citation Ghadiri, M., Harrison, S.T.L. & Fagan-Endres, M.A. 2020. Quantitative X-ray µCT Measurement of the Effect of Ore Characteristics on Non-Surface Mineral Grain Leaching. <i>Minerals.</i> 10(9):746. http://hdl.handle.net/11427/33385 en_ZA
dc.identifier.uri http://hdl.handle.net/11427/33385
dc.description.abstract In heap (bio)leaching processes, a substantial fraction of the valuable mineral is positioned below the ore particle surface. X-ray micro-computed tomography (&mu;CT) was used to quantify the effect of ore type and structure and operating temperature on the leaching of this mineral, to investigate the rate-controlling factors. Mini-leaching columns containing agglomerated chalcopyrite, pyrite, and malachite ores were scanned by X-ray &mu;CT (13.40 &micro;m resolution) at select time intervals. The leaching of a relatively porous malachite ore was reaction-controlled, with no leaching penetration limitation into the ore particles. For two less porous ore types, the structure and higher porosity of the agglomerate rim and conditions that resulted in the degradation of the full ore matrix structure were found to be the determining variables of the leaching extent and time. In the case of a chalcopyrite ore, an enhancement of copper recovery and sulphide mineral dissolution with increasing temperature was attributable to the increased leaching penetration distance and crack development in addition to thermodynamically expected increased leaching rate. Increasing temperature did not affect the maximum penetration distance for the waste rock containing pyrite, with no crack development observed. Overall increases in iron recovery were due to accelerated leaching rates, though diffusion or mineral access limitations were evident at a higher temperature.
dc.source Minerals
dc.source.uri https://www.mdpi.com/journal/minerals
dc.title Quantitative X-ray µCT Measurement of the Effect of Ore Characteristics on Non-Surface Mineral Grain Leaching
dc.type Journal Article
dc.date.updated 2020-09-25T13:28:09Z
dc.source.journalvolume 10
dc.source.journalissue 9
dc.source.pagination 746
dc.identifier.apacitation Ghadiri, M., Harrison, S. T. L., & Fagan-Endres, M. A. (2020). Quantitative X-ray µCT Measurement of the Effect of Ore Characteristics on Non-Surface Mineral Grain Leaching. <i>Minerals</i>, 10(9), 746. http://hdl.handle.net/11427/33385 en_ZA
dc.identifier.chicagocitation Ghadiri, Mahdi, Susan T L Harrison, and Marijke A Fagan-Endres "Quantitative X-ray µCT Measurement of the Effect of Ore Characteristics on Non-Surface Mineral Grain Leaching." <i>Minerals</i> 10, 9. (2020): 746. http://hdl.handle.net/11427/33385 en_ZA
dc.identifier.vancouvercitation Ghadiri M, Harrison STL, Fagan-Endres MA. Quantitative X-ray µCT Measurement of the Effect of Ore Characteristics on Non-Surface Mineral Grain Leaching. Minerals. 2020;10(9):746. http://hdl.handle.net/11427/33385. en_ZA
dc.identifier.ris TY - Journal Article AU - Ghadiri, Mahdi AU - Harrison, Susan T L AU - Fagan-Endres, Marijke A AB - In heap (bio)leaching processes, a substantial fraction of the valuable mineral is positioned below the ore particle surface. X-ray micro-computed tomography (&mu;CT) was used to quantify the effect of ore type and structure and operating temperature on the leaching of this mineral, to investigate the rate-controlling factors. Mini-leaching columns containing agglomerated chalcopyrite, pyrite, and malachite ores were scanned by X-ray &mu;CT (13.40 &micro;m resolution) at select time intervals. The leaching of a relatively porous malachite ore was reaction-controlled, with no leaching penetration limitation into the ore particles. For two less porous ore types, the structure and higher porosity of the agglomerate rim and conditions that resulted in the degradation of the full ore matrix structure were found to be the determining variables of the leaching extent and time. In the case of a chalcopyrite ore, an enhancement of copper recovery and sulphide mineral dissolution with increasing temperature was attributable to the increased leaching penetration distance and crack development in addition to thermodynamically expected increased leaching rate. Increasing temperature did not affect the maximum penetration distance for the waste rock containing pyrite, with no crack development observed. Overall increases in iron recovery were due to accelerated leaching rates, though diffusion or mineral access limitations were evident at a higher temperature. DA - 2020-08-23 DB - OpenUCT DP - University of Cape Town IS - 9 J1 - Minerals LK - https://open.uct.ac.za PY - 2020 T1 - Quantitative X-ray µCT Measurement of the Effect of Ore Characteristics on Non-Surface Mineral Grain Leaching TI - Quantitative X-ray µCT Measurement of the Effect of Ore Characteristics on Non-Surface Mineral Grain Leaching UR - http://hdl.handle.net/11427/33385 ER - en_ZA


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