Application of three-dimensional electrical resistance tomography to characterize gas holdup distribution in laboratory flotation cell

Kourunen, Jari; Niitti, Timo; Heikkinen, Lasse

doi:10.1016/j.mineng.2011.09.004

Cited by 29 publications

(15 citation statements)

References 43 publications

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“…Many researches describe successful applications of the technique for stirred tanks to measure local gas hold-up [13,14,[25][26][27][28]. Value of current injections value is dictated by conductivity of the studied solution.…”

Section: Eitmentioning

confidence: 99%

“…In addition, local gas hold-up remains unknown in whole reactor. Application of Electrical Impedance Tomography (EIT), which is based on voltage measurements, has shown great potential in studies of multiphase flows for phase visualization in 3D [12][13][14]. Since conductivity is a function of gas hold-up, it is possible to obtain local void fraction of secondary phase by measuring voltages difference between primary phase alone and multiphase flow.…”

Section: Introductionmentioning

confidence: 99%

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Experimental and Numerical Study of Multiphase Mixing Hydrodynamics in Batch Stirred Tank Applied to Ammoniacal Thiosulphate Leaching of Gold

Gradov¹,

González²,

Vauhkonen³

et al. 2017

J Chem Eng Process Technol

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Hydrodynamics of aerated slurry is studied experimentally and numerically using the example of thiosulphate leaching of gold concentrate. The studied milled concentrate has shear-thinning fluid rheology and it was imitated by water-based solutions of CMC. Presence of electrolytes, as in the case of the leaching slurry, has great influence on bubble size distribution. Primary phase flow is measured by Particle Image Velocimetry. Local gas hold-up in aerated CMC 50000 (0.15 w%) solution is measured by Electrical Impedance Tomography. Volumetric mass transfer is measured by dynamic method in different CMC solutions over a range of operational conditions in absence and presence of electrolytes. The experimental data was used in CFD modelling of the aerated slurry. Single phase hydrodynamics of shear-thinning fluid (CMC 50000 (0.15 w%)) have been modelled and validated against experimental data with reasonable agreement. Multiphase mixing of the thiosulphate slurry was modelled with the assumption of constant bubble size. The results of the simulations and measurements are presented and discussed.

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Section: Eitmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Study of Multiphase Mixing Hydrodynamics in Batch Stirred Tank Applied to Ammoniacal Thiosulphate Leaching of Gold

Gradov¹,

González²,

Vauhkonen³

et al. 2017

J Chem Eng Process Technol

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“…They also measured the conductivity distribution produced by ERT when a three phase mixture was processed in the flotation cell. In other research, Kourunen et al (2011) measured 3D gas holdup distributions in a mechanical flotation cell under different conditions with a three dimensional ERT device.…”

Section: Electrical Resistance Tomography (Ert)mentioning

confidence: 99%

A review of turbulence measurement techniques for flotation

Meng

Tabosa

Xie

et al. 2016

Minerals Engineering

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“…In other research, Kourunen, et al. [26] estimated the 3D gas holdup distribution in a mechanical flotation cell under different conditions with a three dimensional ERT device.…”

mentioning

confidence: 99%

Measuring turbulence in a flotation cell using electrical resistance tomography

Meng

Xie

Runge

et al. 2015

Meas. Sci. Technol.

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Measuring turbulence in an industrial flotation environment has long been problematic due to the opaque, aggressive and abrasive three-phase environment in a flotation cell. One of the promising measurement techniques is Electrical Resistance Tomography (ERT). By measuring the conductivity distribution across a measurement area, ERT has been adopted by many researchers to monitor and investigate many processes involving multiphase flows. In the research outlined in this paper, a compact ERT probe was built and then used to measure the conductivity distribution within a 60L flotation cell operated with water and air. Two approaches were then developed to process the ERT data and estimate turbulence related parameters. One is a conductivity variance method and the other is based on the Green-Kubo relations. Both rely and use the fluctuation in the ERT measurement caused by bubbles moving through the measurement area, changing the density of the fluid. Results from both approaches were validated by comparing results produced by the ERT probe in a 60 litre flotation cell operated at different air rates and impeller speeds to that measured using an alternative turbulence measurement device. The second approach is considered superior to the first as the first requires the development of auxiliary information which would not usually be known for a new system.

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Application of three-dimensional electrical resistance tomography to characterize gas holdup distribution in laboratory flotation cell

Cited by 29 publications

References 43 publications

Experimental and Numerical Study of Multiphase Mixing Hydrodynamics in Batch Stirred Tank Applied to Ammoniacal Thiosulphate Leaching of Gold

Experimental and Numerical Study of Multiphase Mixing Hydrodynamics in Batch Stirred Tank Applied to Ammoniacal Thiosulphate Leaching of Gold

A review of turbulence measurement techniques for flotation

Measuring turbulence in a flotation cell using electrical resistance tomography

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