Sorting of vegetable seeds by magnetic density separation in comparison with liquid density separation

Köning, Jürgen; Bakker, E.J.; Rem, Peter

doi:10.15258/sst.2011.39.3.06

Cited by 7 publications

(5 citation statements)

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“…This allows the separation between particles with different densities since they would suspend at different heights. The separation is called MDS and has been studied in the past decades [4][5][6] across a wide range of applications including resource recovery (car metals [7]; incinerator bottom ash [8,9]; WEEE [10]; plastics [11][12][13][14]), mineral processing (coal preparation [15]; diamond and precious metal enrichment [16][17][18]), and seed sorting [19].…”

Section: Introductionmentioning

confidence: 99%

An Innovative Magnetic Density Separation Process

Wang,

Rem,

Di Maio

et al. 2024

Preprint

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Motivated by the PEACOC project on metal recovery from solid wastes, an innovative magnetic density separation (MDS) process has been developed for granular material sorting. It has intrinsic advantages over the existing industrialized MDS by eliminating fluid turbulence and particle jamming problems. The new MDS applies an inclined planar magnet and a horizontal basin containing a static magnetic fluid as the separation medium. A particle sliding phenomenon is identified as a feature of the process which could help the separation. The MDS successfully sorted shredded PCBAs to concentrate valuable metals and sorted shredded wires to reduce metallic contaminants in the plastic fractions. A pilot scale facility is introduced to show the design to achieve continuous production and to reduce the consumption of ferrofluid.

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Section: Introductionmentioning

confidence: 99%

An Innovative Magnetic Density Separation Process

Wang,

Rem,

Di Maio

et al. 2024

Preprint

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“…This allows the separation between particles with different densities since they suspend at different heights and allows the separation between multiple particle streams in one single process. The separation is called MDS and has been studied in the past decades [10][11][12] across a wide range of applications including resource recovery (car metals [13]; incinerator bottom ash [14,15]; WEEE [16]; plastics [17,18]), mineral processing (coal preparation [19]; diamond and precious metal enrichment [20][21][22]), and seed sorting [23].…”

Section: Introductionmentioning

confidence: 99%

An Innovative Magnetic Density Separation Process for Sorting Granular Solid Wastes

Wang,

Rem,

Di Maio

et al. 2024

Recycling

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Solid waste sorting is an important pre-treatment in recycling to improve the efficiency of material recovery and reduce costs. Motivated by the PEACOC project on metal recovery from solid wastes, an innovative magnetic density separation (MDS) process has been developed for solid waste sorting. It has intrinsic advantages over conventional gravity separation technologies and the previously industrialized MDS process. The new MDS process applies an inclined planar magnet and a horizontal basin containing a static magnetic fluid as the separation medium. A particle sliding phenomenon is identified as a feature that could help the separation. Experiments have been carried out to demonstrate the role of the MDS in concentrating valuable metals in shredded PCBAs and reducing metallic contaminants in plastic fractions of shredded wires. A pilot scale facility is introduced to show the design to achieve continuous production and to reduce the consumption of ferrofluid.

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“…Dilute ferrofluids have applications in the separation of materials via magnetic levitation in magnetohydrostatic separators, for instance, in the separation of diamonds, 8 minerals, 9 waste metals, 10 and plant seeds. 11 Moreover, waste plastics can be separated into different fractions in a single continuous processing step via magnetic density separation. 12 Sedimentation is a clear drawback of dilute ferrofluids since it renders their magnetic density separation performance time dependent.…”

Section: Introductionmentioning

confidence: 99%

“…The concentration of such ferrofluids remains relatively homogeneous in external fields because magnetic sedimentation is rapidly balanced by back-diffusion of the particles. , In dilute ferrofluids, however, sedimentation proceeds much longer before the equilibrium between sedimentation and diffusion is approached, and by then much of the magnetic material has settled toward the magnet. Dilute ferrofluids have applications in the separation of materials via magnetic levitation in magnetohydrostatic separators, for instance, in the separation of diamonds, minerals, waste metals, and plant seeds . Moreover, waste plastics can be separated into different fractions in a single continuous processing step via magnetic density separation .…”

Section: Introductionmentioning

confidence: 99%

Magnetic Sedimentation Velocities and Equilibria in Dilute Aqueous Ferrofluids

2020

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Dilute ferrofluids have important applications in the separation of materials via magnetic levitation. However, dilute ferrofluids pose an additional challenge compared to concentrated ones. Migration of the magnetic nanoparticles toward a magnet is not well counteracted by a buildup of an osmotic pressure gradient, and consequently, homogeneity of the fluid is gradually lost. Here, we investigate this phenomenon by measuring and numerically modeling time-dependent concentration profiles in aqueous ferrofluids in the field of a neodymium magnet and at 10 T in a Bitter magnet. The numerical model incorporates magnetic, frictional, and osmotic forces on the particles and takes into account the polydispersity of the particles and the spatial dependence of the magnetic field. The magnetic sedimentation rate in our most stable ferrofluids can be understood in terms of the magnetophoresis of separate nanoparticles, a best-case scenario when it comes to applications.

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Sorting of vegetable seeds by magnetic density separation in comparison with liquid density separation

Cited by 7 publications

References 0 publications

An Innovative Magnetic Density Separation Process

An Innovative Magnetic Density Separation Process

An Innovative Magnetic Density Separation Process for Sorting Granular Solid Wastes

Magnetic Sedimentation Velocities and Equilibria in Dilute Aqueous Ferrofluids

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