Magnetic resonance imaging characterisation of the influence of flowrate on liquid distribution in drip irrigated heap leaching

Fagan-Endres, Marijke A.; Harrison, Susan T.L.; Johns, Michael L.; Sederman, Andrew J.

doi:10.1016/j.hydromet.2015.10.003

Cited by 16 publications

(3 citation statements)

References 14 publications

(23 reference statements)

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“…Genomic engineering has been implemented to obtain targeted bacteria [21,22]. Additionally, the intervention of precise scanning and observatory technologies-such as computed tomography (CT), magnetic resonance imaging (MRI), particle image velocimetry (PIV), and others [23][24][25][26]-have improved on research. Some characterized models have been improved, like the lattice Boltzmann model (LBM) and so on [27][28][29].…”

Section: Introductionmentioning

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: Introductionmentioning

confidence: 99%

Copper Bioleaching in China: Review and Prospect

et al. 2018

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“…In addition, Neethling s team of Imperial College London innovatively used the suspension force measurement method to monitor the liquid holding behavior of the static ore particle pile system. Some computer tomography, nuclear magnetic resonance, and other techniques have also been applied to the liquid holding characteristics of unsaturated porous media stacking heap [23][24][25], but the above research findings are more static and transient without considering mineral leaching. Despite this, there are still few studies that both consider liquid hysteresis and solute transport in agglomerated leaching condition, leading to a research gap regarding a deep understanding of how agglomerated heaps enhance mineral leaching and solute transport intensification [26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic Hysteresis and Solute Transport in Agglomerated Heaps under Irrigation, Stacking, and Bioleaching Controlling

et al. 2022

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Hydrodynamic hysteresis exists widely in agglomerated heaps with well-developed intra-pores, and it directly affects solute transports and bioleaching reaction. In this paper, the dynamic liquid retention behavior under different heap porosity and irrigation condition is quantified via a novel real-time, in-situ liquid retention characterizing system (RILRCS), and the potential effects of initial liquid retention on solute transport and leaching reaction are carefully discussed. The results show that the immobile liquid is dominant in agglomerated heaps. The ratio of immobile and mobile liquid (η) dynamically changes due to mineral dissolution and new flow path appearances. The η normally increases and mobile liquid occupies a higher proportion due to acidic leaching reactions, especially at a smaller Rg (10.32 mm) and a larger u (0.10 mm/s). The dynamic liquid retention is more sensitive to the diameter of packed feeds (Rg) and superficial flow rate (u) instead of leaching reactions. This might be because the damage of leaching reaction on minerals pores/voids is limited and cannot extensively change the potential pore channels or fluid flow paths. Based on pulse tracing and conductivity tests, we reveal that the solute resides longer under a slower u and smaller packed Rg condition, which corresponds well with desirable copper leaching efficiency. Specifically, the liquid hysteresis behavior is more obvious at a lower u (0.01 mm/s) and smaller Rg (10.32 mm). This paper gives a good reference to ascertain the liquid retention and hydrodynamic hysteresis and promote mineral leaching performance.

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“…The 3D MRI technique has also been adopted to study the effect of liquid flowrate changes on heap hydrology and control parameters during the bioleaching process, such as ferrous ion oxidation (Videla et al, 2016). Experimental results have shown that an increase in flowrate causes an increase in the number of rivulets in the leaching column (Fagan et al, 2013;Fagan et al, 2015). In addition, 3D imaging technologies, such as X-ray computed tomography (CT) and positron emission tomography (PET), have also been applied in heap leaching Wildenschild and Sheppard, 2013).…”

Section: Introductionmentioning

confidence: 99%

Coupled DEM-LBM simulation of saturated flow velocity characteristics in column leaching

Feng

et al. 2018

Minerals Engineering

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Heap leaching is a process extensively used by the mining industry to recover valuable metals from low-grade ores. However, the flow of the solution in a heap leaching system is disordered, uncontrollable and difficult to predict. To investigate the velocity characteristics of saturated flows in column leaching under different conditions, a combined experimental and numerical approach was carried out in the current work. MRI (magnetic resonance imaging) technology was employed in the column leaching experiment and numerical simulations were performed by combining the discrete element method (DEM) with the lattice Boltzmann method (LBM) to predict the microscopic seepage velocity field in the leaching column. The fluid flow and solid particles were modelled by the LBM and DEM respectively, and the interfacial interaction between the fluid and the solids was resolved by the immersed boundary method (IMB). It was demonstrated that the maximum fluid velocity is positively correlated with irrigation rate and porosity. Moreover, the preferential flow mainly passes through the main seepage channel. Thus, the numerical model developed in the present work is a reliable prediction tool for understanding the regularities of mesoscopic seepage velocity distributions in column leaching processes.

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Magnetic resonance imaging characterisation of the influence of flowrate on liquid distribution in drip irrigated heap leaching

Cited by 16 publications

References 14 publications

Copper Bioleaching in China: Review and Prospect

Copper Bioleaching in China: Review and Prospect

Hydrodynamic Hysteresis and Solute Transport in Agglomerated Heaps under Irrigation, Stacking, and Bioleaching Controlling

Coupled DEM-LBM simulation of saturated flow velocity characteristics in column leaching

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