Evaluation of stucco binder for agglomeration in the heap leaching of copper ore

Kodali, Phanindra; Depçi̇, Tolga; Dhawan, Nikhil; Wang, Xuming; Lin, Chenyu

doi:10.1016/j.mineng.2011.03.024

Cited by 30 publications

(12 citation statements)

References 5 publications

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“…The initial crack network in the particles comminuted by HPGR increases during the leaching process, which splits each single particles to two or more new ore particles and produces a particles size distribution different to the initial reactor feed. particles and deposited at local areas and an extremely small amount of fine particles are transported out of the reactor by the solution (Kodali et al, 2011, Yang et al, 2008. Since in this study the solution reagent was introduced to the leach reactors from the bottom and there were basket frames at different level inside the leach reactors (Ghorbani et al, 2011d), there was no fine particles transportation out of the reactor.…”

Section: Effect Of Hpgr Product On Percolation Of Heap Leachingmentioning

confidence: 87%

“…It is known that the presence of excess fines in heap leaching operations may cause low recovery due to reduced heap permeability and/or channelling of lixiviant flow. These problems are mitigated to some extent by agglomeration pre-treatment prior to heap leaching (Kodali et al, 2011;Yang et al, 2008). In this work, the feed material to the leach reactors had the same selection of the sieve ranges for both the HPGR and cone crusher tests.…”

Section: Effect Of Hpgr Product On Percolation Of Heap Leachingmentioning

confidence: 99%

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

Ghorbani

Mainza

Petersen

et al. 2013

Minerals Engineering

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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%.

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Section: Effect Of Hpgr Product On Percolation Of Heap Leachingmentioning

confidence: 87%

Section: Effect Of Hpgr Product On Percolation Of Heap Leachingmentioning

confidence: 99%

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

Ghorbani

Mainza

Petersen

et al. 2013

Minerals Engineering

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“…The initial crack network in the particles increases during the leaching process, which splits each single particle into two or more new ore particles and produces a particles size distribution different to the initial reactor feed (Ghorbani et al, 2013b). However, after leaching, under the coupled action of multiple factors, such as hydraulic power, gravity and chemical reactions, newly generated fine particles flow downwards through the pore space among coarse particles and deposited at local areas and an extremely small amount of fine particles are transported out of the reactor by the solution (Kodali et al, 2011;Yang et al, 2008). The most fundamentally important aspect of heap leaching is permeability of the leach and even percolation of the lixivant solution throughout all the ore.…”

Section: Effect Of the Clay Minerals On Percolation Of The Heap Leachingmentioning

confidence: 99%

Leaching behaviour and the solution consumption of uranium–vanadium ore in alkali carbonate–bicarbonate column leaching

Ghorbani

Montenegro²

2016

Hydrometallurgy

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Although heap leaching using sulfuric acid was introduced to the uranium industry in the 1950s, sodium carbonate-bicarbonate (alkaline) heap leaching of low-grade Ca-carbonate-rich uranium ores has recently gained popularity. This study presents the results of two column tests on a calcrete-type uranium-vanadium (carnotite) ore using a mixture of sodium carbonate and bicarbonate The column leach data was therefore fitted to a simplified first-order kinetic model using two approaches, a general form and a second based on the reagent consumption per unit mass of the initial valuable species (U and V). As reagent consumption is a key economic factor in the heap leaching process, having a kinetic leaching model incorporating reagent consumption would provide useful techno-economic information. In this regards a new leaching index of (β) is also introduced. Both approaches of the first order kinetic model provide a good agreement with the column testing data.

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“…Although the influence of average grade of feed on concentration recovery has been evaluated (Nakhaei et al, 2012), no specific results have been obtained from the effect of average grade of feed on the heap leaching recovery. As there are several effective parameters on leaching recovery (Maley et al, 2009;Norris et al, 2010;Kodali et al, 2011), the effect of average grade of feed on leaching recovery hasn't been clearly specified yet. However, this can be assessed by laboratory tests for a specific mine and it can be added to studies related to cut-off grades.…”

Section: Average Grades and Process Recoveriesmentioning

confidence: 99%

A new algorithm to determine optimum cut-off grades considering technical, economical, environmental and social aspects

Rahimi

Ghasemzadeh

2015

Resources Policy

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Evaluation of stucco binder for agglomeration in the heap leaching of copper ore

Cited by 30 publications

References 5 publications

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

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

Leaching behaviour and the solution consumption of uranium–vanadium ore in alkali carbonate–bicarbonate column leaching

A new algorithm to determine optimum cut-off grades considering technical, economical, environmental and social aspects

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