Collapse of house-of-cards clay structures and corresponding tailings dewatering induced by alternating electric fields

Abraham, Tinu; Lam, N.S.K.; Xu, Jonathan; Zhang, Dan; Wadhawan, Harshita; Kim, Hanjun; Lee, Michael; Thundat, Thomas

doi:10.1080/07373937.2018.1482313

Cited by 9 publications

(2 citation statements)

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“…The isotherm belonged to type IV with a H3 hysteresis loop, which is characteristic of predominantly mesoporous materials (Thommes et al , 2015). This type of isotherm is typical of aggregates of plate-like particles such as clay minerals (Abraham et al , 2019). Moreover, the pore-size distribution is characterized by a unimodal distribution centred at 3.59 nm (Fig.…”

Section: Resultsmentioning

confidence: 97%

Adsorption of crystal violet on kaolinite clay: kinetic and equilibrium study using non-linear models

et al. 2022

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Section: Resultsmentioning

confidence: 97%

Adsorption of crystal violet on kaolinite clay: kinetic and equilibrium study using non-linear models

et al. 2022

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“…These electrokinetic (EK) processes have been studied extensively for decades (Casagrande 1949;Dixit et al 1975;Islam 2014;Lockhart 1983;Shang 1997). The increase in dewatering rate achieved by EK dewatering technologies, such as the EKS-DT process, relative to self-weight consolidation is most pronounced for tailings with a high fines content and low solids content (Abraham et al 2018;Franks et al 2011;Long et al 2006;Sutherland et al 2015). With current tailings management technologies, these tailings tend to be the most difficult and expensive to dewater.…”

Section: Introductionmentioning

confidence: 99%

Tailings dewatering with the EKS-DT process

Vandersleen¹,

Hanna²

2023

Paste 2023: 25th International Conference on Paste, Thickened and Filtered Tailings

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The global inventory of tailings is currently >55 billion m 3 and is forecast to increase to almost 70 billion m 3 by 2025. The cost of these tailings includes the construction and maintenance of tailings storage facilities (TSFs), the liability of catastrophic releases, environmental damages, and erosion of social licence to continue mining. Billions of dollars and decades of research have been spent searching for improved technologies to better dewater tailings and reclaim TSFs.The ElectroKinetic Solutions Inc. (EKS) tailings dewatering technology (EKS-DT) process has been developed to dewater legacy and fresh tailings in situ, using electrokinetics. Over more than a decade of lab and field-scale testing has significantly improved the technology's dewatering effectiveness and reliability and confirmed its commercial viability. The process is less costly compared to current tailings management technologies and excels in its ESG performance. EKS has shown through a field demonstration that very fine-grained tailings (i.e. average particle size <6 microns) with an initial solids content of 20% (kg/kg) can be dewatered to >60%. EKS has also produced a forecasting model. The model accurately forecasts dewatering time and energy consumption for different designs and operating schedules, critical information for designing commercial installations.A 1,700 m 3 field demonstration from 2019 to 2021 proved that the technology is commercially viable. During this time, over 1,100 m3 of water was removed from the tailings and the energy consumption was <15 kWh per m 3 of water released. The process was operated year-round through two harsh winters. The process operated as well during the ice-covered period as during warmer months. The installation was operated continuously by the automated control system without an onsite operator. The design of the first commercial installations of the technology is now underway.The engineering design process for the field demonstration and for commercial systems will be discussed, including the role of the EKS model.

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The effect of print speed and material aging on the mechanical properties of a self-healing nanocomposite hydrogel

Sällström

Goulas

Martin

et al. 2020

Additive Manufacturing

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Collapse of house-of-cards clay structures and corresponding tailings dewatering induced by alternating electric fields

Cited by 9 publications

References 32 publications

Adsorption of crystal violet on kaolinite clay: kinetic and equilibrium study using non-linear models

Adsorption of crystal violet on kaolinite clay: kinetic and equilibrium study using non-linear models

Tailings dewatering with the EKS-DT process

The effect of print speed and material aging on the mechanical properties of a self-healing nanocomposite hydrogel

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