Development of an integrated heap leach solution flow and mineral leaching model

Robertson, S.W.

doi:10.1016/j.hydromet.2016.12.010

Cited by 13 publications

(12 citation statements)

References 7 publications

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“…The complexity of bioleaching system has complicated the estimation of extraction rates and effects during leaching processes, as shown by a few specific experiments [199]. Hence, some models were constructed to replace studies where common approaches have not been implemented [200]. For the reaction, fluid flow, and other factors in the complex bioleaching process, model construction and computer simulation have been used as an alternative technology [201].…”

Section: Multiphysics Coupled Model Of Bioleaching Processmentioning

confidence: 99%

Copper Bioleaching in China: Review and Prospect

et al. 2018

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The commercial application of copper bioleaching, an environmentally-friendly approach for low-grade and secondary mineral resources recycling, has increased worldwide since the 2000s. As the world's second-largest economic entity and the largest developing country, China has the largest demand for metal resources, significantly advancing the theory and industrial technology of copper bioleaching. This paper reviews the exploration and application of copper bioleaching in China. Two typical bioleaching applications and technological processes, bioheap leaching at the Zijinshan Copper Mine and bioheap leaching at the Dexing Copper Mine, are introduced. The considerable research completed by researchers is summarized, especially focusing on the isolation and identification of leaching bacteria, the bioleaching mechanism and interface reactions, multistage percolation behavior, bioleaching system reconstruction, the multiphysics coupled model, and enhanced copper bioleaching from waste printed circuit boards (WPCBs). Based on this investigation in China, key trends and prospects in copper bioleaching-such as efficiency improvement, environmental protection, and improved technology applications-are proposed.

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Section: Multiphysics Coupled Model Of Bioleaching Processmentioning

confidence: 99%

Copper Bioleaching in China: Review and Prospect

et al. 2018

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“…Studies typically consider this from the perspective of the copper-bearing ore minerals [26,27], but not from the gangue mineral perspective. Given the heterogeneity that can be expected in the mineralogy of large particles (top size 25 mm), together with porosity distribution, a shrinking core approach to particle reactivity [28] is likely to be an oversimplification. Mineral grain size distribution, relative to the particle size distribution (PSD) of the ore, could therefore be a parameter tested during column tests, as well as in acid curing.…”

Section: Other Factors Affecting Mineral-acid Interactionsmentioning

confidence: 99%

Acid-Gangue Interactions in Heap Leach Operations: A Review of the Role of Mineralogy for Predicting Ore Behaviour

Chetty

2018

Minerals

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Abstract:Heap leaching accounts for a fifth of global copper production, sourced primarily from porphyry ores, yet metal recoveries are often not optimal. Gangue, and its interaction with acid, plays an important role in such processes. Thus, a proper understanding of gangue minerals present in the ore, their textural relationships relative to particle size distribution, reactivity with acid under different conditions, and relationship to lithotypes and geological alteration in the orebody, is necessary to predict ore behaviour in the comminution, agglomeration, curing and heap leach unit operations. Mineralogical tools available for characterisation are routine X-ray diffraction, optical microscopy, automated scanning electron microscopy, and electron probe microanalysis, accompanied by more recent advancements in hyperspectral infrared imaging and X-ray computed tomography. Integrated use of these techniques allows mineral abundance, textural relationships and mineral chemistry to be addressed over the range of particle and agglomerate sizes. Additionally, diagnostic leach results can be better interpreted when calibrated against robust mineralogical data. The linkage of ore attributes, metallurgical behaviour and their distribution in the orebody forms an integral part of a geometallurgical approach to predicting, and addressing, changes during the heap leaching process. Further investigation should address the fundamentals of gangue reaction with strong acid, and concomitant structural breakdown during curing and agglomeration processes, and how this differs from gangue-acid reactivity under weaker acid conditions, combined with temperature and fluid flow effects of heap leaching. Pre-and post-characterisation is necessary to understand and quantify the effects of variables for gangue-acid reactivity in these various operations. The characterisation outcomes should lead to a refinement of the hierarchy of gangue mineral reactivity under different conditions of comminution and leaching, and how these in turn relate to identified ore types that are mined.

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“…Smaller size experimental models and numerical models are used instead. Experimentally, columns from 0.5 to 6 m high are used to reproduce leaching conditions (Bennett et al, 2012;Robertson, 2017). Such tests allow analysing the influence of the different leaching parameters.…”

Section: Introductionmentioning

confidence: 99%

“…Depending on the operating conditions (evolution of heap packing or of the heat within the heap), additional couplings may be required (Dixon, 2000;Valencia et al, 2008). Note that several models were proposed in the literature but few are used in industrial applications (Ghorbani et al, 2016;Robertson, 2017). The main difference between these models lies in the governing assumptions and the related mass balance equations used to represent dissolved species transport, leaching solution flow and the reactional model.…”

Section: Introductionmentioning

confidence: 99%

“…The main difference between these models lies in the governing assumptions and the related mass balance equations used to represent dissolved species transport, leaching solution flow and the reactional model. The Richards equation T in combination with the traditional Mualem-Van Genuchten model is usually chosen to model solution flow through the heap (Robertson, 2017) as leaching are often occurs under partially saturated conditions. However a generalised Darcy model may also be used when the gas phase is considered (Bennett et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

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An integrated multiscale approach to heap leaching of uranium-ore agglomerates

et al. 2018

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Development of an integrated heap leach solution flow and mineral leaching model

Cited by 13 publications

References 7 publications

Copper Bioleaching in China: Review and Prospect

Copper Bioleaching in China: Review and Prospect

Acid-Gangue Interactions in Heap Leach Operations: A Review of the Role of Mineralogy for Predicting Ore Behaviour

An integrated multiscale approach to heap leaching of uranium-ore agglomerates

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