Effects of intermittent liquid addition on heap hydrodynamics

Fernando, W. Ashane M.; Ilankoon, I.M.S.K.; Chong, Meng Nan; Syed, Tauqir H.

doi:10.1016/j.mineng.2018.05.016

Cited by 13 publications

(2 citation statements)

References 25 publications

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“…The uneven moisture distributions in the steady state are more significant under higher irrigation rates and larger dripper spacings. Hydrodynamics is greatly affected by the form of liquids addition, and intermittent liquid addition significantly improves the liquid distribution uniformity 9 . Under extreme low-temperature conditions, the liquid flow is enhanced when the temperature increases, whereas the influence of irrigation rates on the liquid flow is limited 10 , 11 .…”

Section: Introductionmentioning

confidence: 99%

Analysis of intra-particle liquid capillary spread mechanisms in high-temperature stope leaching using MRI

Zhi

Gan

Zhang

et al. 2022

Sci Rep

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Capillary penetration is widely existed in stope leaching, both the rate of liquid wetting ore and flow out of ore are affected by it. Stope leaching is carried out in a high-temperature environment when mining minerals with large burial depth. The mechanism of intra-particle liquid capillary penetration mechanisms at high-temperature have not been revealed. In this paper, samples with a size of Φ50 mm × 100 mm were selected for quantitative analysis. The capillary rise behaviour inside samples with different porosity were detected at 30 °C, 40 °C and 50 °C by using magnetic resonance imaging (MRI). In most cases, capillary rise height is underestimated when the outside wetting line is used as an indicator, because the rise height inside the sample is greater. The liquid capillary rise height increased slightly with the temperature, whereas the wetting surface profile remained unchanged. The capillary rise rate increased significantly with porosity, mainly due to the increase of internal effective porosity. The results help to understand the liquid penetration behaviour under high-temperature stope leaching condition, and lay a theoretical foundation for improving the liquid permeability.

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Section: Introductionmentioning

confidence: 99%

Analysis of intra-particle liquid capillary spread mechanisms in high-temperature stope leaching using MRI

Zhi

Gan

Zhang

et al. 2022

Sci Rep

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“…In the unsaturated ore packed beds, McBride et al (2015) explored the potential effect of heap porosity on liquid retention and preferential flow paths, and the results reveal that flexible irrigation could disturb and affect initial flow paths [30]. As a result, in the view of the current unsatisfactory liquid holdup behavior of unsaturated packed beds [31,32], adjusting the irrigation operation could promote the liquid retention and eventually obtain desirable extraction efficiency of ore heaps.…”

Section: Introductionmentioning

confidence: 99%

Understanding the Effect of Stepwise Irrigation on Liquid Holdup and Hysteresis Behavior of Unsaturated Ore Heap

2021

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Liquid is a crucial medium to contain soluble oxygen, valuable metal ions, and bacteria in unsaturated heap leaching. Liquid retention behavior is the first critical issue to be considered to efficiently extract low-grade minerals or wastes. In this study, the residual liquid holdup of an unsaturated packed bed was quantitatively discussed by liquid holdup (θ), residual liquid holdup (θresidual), relative liquid holdup (θ’), and relative porosity (n*) using the designed measuring device. The detailed liquid holdup and the hysteresis behavior under stepwise irrigation are indicated and discussed herein. The results show that relative porosity of the packed bed was negatively related to particle size, and intra-particle porosity was more developed in the −4.0 + 2.0 mm packed bed. The higher liquid retention of the unsaturated packed bed could be obtained by using stepwise irrigation (incrementally improved from 0.001 to 0.1 mm/s) instead of uniform irrigation (0.1 mm/s). It could be explained in that some of the immobile liquid could not flow out of the unsaturated packed bed, and this historical irrigation could have accelerated formation of flow paths. The θ was sensitive to superficial flow rate (or irrigation rate) in that it obviously increased if a higher superficial flow rate (u) was introduced, however, the θresidual was commonly affected by n* and θ’. Moreover, the liquid hysteresis easily performed under stepwise irrigation condition, where θ and θresidual were larger at u of the decreasing flow rate stage (DFRS) instead of u of the increasing flow rate stage (IFRS). These findings effectively quantify the liquid retention and the hysteresis behavior of ore heap, and the stepwise irrigation provides potential possibility to adjust liquid retention conditions.

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Visualization of flow behavior in ore-segregated packed beds with fine interlayers

Wang

Yin

2020

Int J Miner Metall Mater

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Effects of intermittent liquid addition on heap hydrodynamics

Cited by 13 publications

References 25 publications

Analysis of intra-particle liquid capillary spread mechanisms in high-temperature stope leaching using MRI

Analysis of intra-particle liquid capillary spread mechanisms in high-temperature stope leaching using MRI

Understanding the Effect of Stepwise Irrigation on Liquid Holdup and Hysteresis Behavior of Unsaturated Ore Heap

Visualization of flow behavior in ore-segregated packed beds with fine interlayers

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