Observation of iron ore beneficiation within a spiral concentrator by positron emission particle tracking of large (Ø=1440μm) and small (Ø=58μm) hematite and quartz tracers

Boucher, Darryel; Deng, Zhoutong; Leadbeater, Thomas; Langlois, Raymond; Waters, Kristian E.

doi:10.1016/j.ces.2015.10.018

Cited by 17 publications

(15 citation statements)

References 42 publications

(53 reference statements)

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“…These unit operations have been the primary focus of initial PEPT studies as the particle behaviour and characteristics (being low speeds, high residence times, and large particle sizes) are conducive to a high tracking rate and statistically meaningful, time averaged data. Recently, however, the PEPT technique has been employed in more difficult unit operations such as hydrocyclones (Chang et al 2011, Radman et al 2014, spiral concentrators (Boucher et al 2016) and flotation cells (Cole et al 2014), with the latter being the most advanced due to its higher residence times. The high particle speeds, low residence times (requiring a large amount of recirculation or multiple particle tracking), and small particle sizes has limited the gathering of statistically meaningful data, with velocity and location details typically being represented by a single pass rather than time average velocity fields.…”

Section: Introductionmentioning

confidence: 99%

Performance analysis of a new positron camera geometry for high speed, fine particle tracking

Sovechles

Boucher

Pax³

et al. 2017

Meas. Sci. Technol.

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A new positron camera arrangement was assembled using 16 ECAT951 modular detector blocks. A closely packed, cross pattern arrangement was selected to produce a highly sensitive cylindrical region for tracking particles with low activities and high speeds. To determine the capabilities of this system a comprehensive analysis of the tracking performance was conducted to determine the 3D location error and location frequency as a function of tracer activity and speed. The 3D error was found to range from 0.54 mm for a stationary particle, consistent for all tracer activities, up to 4.33 mm for a tracer with an activity of 3 MBq and a speed of 4 m · s−1. For lower activity tracers (<10−2 MBq), the error was more sensitive to increases in speed, increasing to 28 mm (at 4 m · s−1), indicating that at these conditions a reliable trajectory is not possible. These results expanded on, but correlated well with, previous literature that only contained location errors for tracer speeds up to 1.5 m · s−1. The camera was also used to track directly activated mineral particles inside a two-inch hydrocyclone and a 142 mm diameter flotation cell. A detailed trajectory, inside the hydrocyclone, of a −212 + 106 µm (10−1 MBq) quartz particle displayed the expected spiralling motion towards the apex. This was the first time a mineral particle of this size had been successfully traced within a hydrocyclone, however more work is required to develop detailed velocity fields.

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Section: Introductionmentioning

confidence: 99%

Performance analysis of a new positron camera geometry for high speed, fine particle tracking

Sovechles

Boucher

Pax³

et al. 2017

Meas. Sci. Technol.

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“…As discussed by the authors, the standard k-ε turbulence model only considers large turbulent eddies and not smaller eddies responsible for further particle dispersion and entrainment. Boucher et al [151] used similar turbulence and drag equations, when studying the motion of quartz particles in a tank of water. However, their CFD-DEM model was able to quantitatively reproduce the range of particle velocities and displacements.…”

Section: Solid-liquid Mixingmentioning

confidence: 99%

A Novel Approach For Analyzing Mixing Quality In Solid-Liquid Stirred Tanks Via Coupled Computational Fluid Dynamics - Discrete Element Method And Electrical Resistance Tomography

Tran¹

2021

Preprint

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The mixing quality of a solid-liquid stirred tank operating in the turbulent regime was investigated, numerically and to an extent experimentally. Simulations were performed by coupling Computational Fluid Dynamics (CFD) and the Discrete Element Method (DEM). The results were evaluated against experimental data obtained using Electrical Resistance Tomography (ERT). This facilitated a novel and more rigorous assessment of CFD-DEM coupling – i.e. based on the spatial distribution of particle concentrations. Furthermore, a new mixing index definition was developed to quantify suspension quality to work in tandem with existing dispersion mixing indexes. This provides a more complete interpretation of mixing quality. In this work, it was found that the model underestimated suspension and dispersion due to model limitations associated with mesh size and fluid-particle interaction models. Furthermore, the predicted mixing quality was sensitive to changes in the drag model, including other fluid-particle interaction forces in simulations, and variations in certain particle properties

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“…In this paper, a method is detailed through which the N js may instead be determined using positron emission particle tracking (PEPT), a technique which employs highly penetrating gamma radiation to image the 3D motion of particles even within the interior of dense, optically opaque systems. In addition to potentially offering a more rigorous and unambiguous measurement of N js (the method presented being fully algorithmic as opposed to relying on human interpretation), PEPT's ability to probe opaque systems, objects, and fluids means that such measurements can be performed in real process equipment, and with real industrial fluids and particles [7][8][9][10][11][12].…”

Section: Measuring Solids Suspension and Homogeneity In Stirred-tank mentioning

confidence: 99%

Positron Emission Particle Tracking for Liquid‐Solid Mixing in Stirred Tanks

et al. 2020

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Mixing in stirred tanks is vital to a wide range of industrial processes, typically requiring solids to be fully suspended and evenly distributed. The quality of suspension and mixing is typically measured visually. Such measurements are thus subject to human interpretation and can only feasibly be conducted in transparent systems – an uncommon condition in industrial systems. Visual measurements of homogeneity must also infer full 3D distributions of particles solely from the observation of a limited section thereof. This work details methods by which a system's homogeneity and state of suspension may be measured and quantified with no human interpretation, which can extract information from opaque systems and consider full 3D data acquired throughout the interior of a given system.

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Observation of iron ore beneficiation within a spiral concentrator by positron emission particle tracking of large (Ø=1440μm) and small (Ø=58μm) hematite and quartz tracers

Cited by 17 publications

References 42 publications

Performance analysis of a new positron camera geometry for high speed, fine particle tracking

Performance analysis of a new positron camera geometry for high speed, fine particle tracking

A Novel Approach For Analyzing Mixing Quality In Solid-Liquid Stirred Tanks Via Coupled Computational Fluid Dynamics - Discrete Element Method And Electrical Resistance Tomography

Positron Emission Particle Tracking for Liquid‐Solid Mixing in Stirred Tanks

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