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SUMMARY:Modelling of gold-cyanidation reaction in percolation leaching
DTSTART;VALUE=DATE-TIME:20241118T160000Z
DTEND;VALUE=DATE-TIME:20241118T161500Z
DTSTAMP;VALUE=DATE-TIME:20260713T125503Z
UID:indico-contribution-9842@events.saip.org.za
DESCRIPTION:Speakers: Velaphi Moyo ()\, O.Philip Oladijo ()\nModelling of 
 gold-cyanidation reaction in Percolation Leaching\n\nV. Moyo\, L. Robert a
 nd O.P. Oladijo* \n\nDepartment of Chemical\, Materials and Metalurgical E
 ngineering\, Botswana International University of Science and Technology (
 BIUST)\, Palapye\nCorresponding author: oladijop@biust.ac.bw\n\nAbstract\n
 At a global scale\, depletion of large ore reserves and relative limited o
 peration period of mines has made large investment to be tough to implemen
 t. This has prompted the implementation of new sustainability strategies t
 o fulfill the world’s metal demand. Percolation leaching is one of the n
 ew sustainability strategies and normally applied as vat leaching in gold 
 extraction process.\n\nThe effects of gold leaching parameters namely cyan
 ide concentration\, pH and permeability of the fixed ore bed is studied in
  this work in order to optimize the percolation leaching process. A numeri
 cal modelling method is applied to predict the amount of gold remaining in
  the fixed ore bed after a known time has elapsed. The surface reaction be
 tween gold grains and free cyanide ions and aqueous oxygen is modeled base
 d on the framework of the shrinking core model\, the internal diffusion of
  the oxygen through the ash layer is accounted for using the pseudo-steady
  state mass balance. Other factors incorporated into the model include con
 vective transport of cyanide from the top of the column through the fixed 
 ore bed to the bottom of the column and the amount of unreacted gold parti
 cles in the fixed bed ore. The results of the simulation model are then us
 ed to analyze\, control and optimize the percolation leaching process. Thi
 s reduces the number of experiments required to achieve the same results.\
 n\nThe model can simulate the overall gold oxidation level as well as the 
 oxidation profile of the gold grains i.e the oxidation depth of gold grain
 s of different sizes and at different locations within the rock particles.
  The experimental data from laboratory leaching column is used to estimate
  the model parameters. \n\nThe amount of slimes and clays in a specific or
 e that can reduce the permeability of the ore is also established through 
 column leaching experimental work. This value is an essential input requir
 ed for efficient permeability of the fixed ore bed. Under these conditions
 \, the fixed bed of ore has a narrow size range which favors efficient per
 colation of the leaching solution.\n\nKeywords: Percolation leaching\, shr
 inking core model\, Parameter estimation\,\n\nhttps://events.saip.org.za/e
 vent/249/contributions/9842/
LOCATION:
URL:https://events.saip.org.za/event/249/contributions/9842/
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