The role of zeta potentials of oil droplets and quartz particles during collectorless liquid-liquid extraction

Kusaka, Eishi; Nakahiro, Yoshitaka; Wakamatsu, Takahide

doi:10.1016/0301-7516(94)90032-9

Cited by 21 publications

(19 citation statements)

References 13 publications

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“…The separation of a mixture of fine and ultrafine particles can be performed by mineral processing methods, i.e., flotation [37,38], emulsion flotation [39][40][41], and two-liquid flotation [20,42]. All these methods utilize the advantage of the heterocoagulation of particle and bubble/non-polar oil in polar solvent, such as water.…”

Section: Heterocoagulation Of Particle and Non-polar Oil Dropletmentioning

confidence: 99%

“…Although the heterocoagulation of fine particles and non-polar oil droplet in aqueous solution has been reported [20,47], little information has been reported regarding the heterocoagulation of ultra-fine particles and non-polar oil droplet in organic solvent that is eventually the heart of the proposed two-liquid flotation. Thus, it is important to understand and investigate such heterocoagulation to extract its science and give a better feedback to the engineering of ultra-fine particle separation by two-liquid flotation.…”

Section: Heterocoagulation Of Particle and Non-polar Oil Dropletmentioning

confidence: 99%

“…Assuming that the average radius of the particles (or aggregate) (a) is much smaller than that of the non-polar oil droplets (a no ) (a << a no ), V A and V R can be expressed for the interaction between a sphere and an infinite plate [20]:…”

Section: Dlvo Theorymentioning

confidence: 99%

“…The Debye-Huckel reciprocal length in Equation (15) is expressed for a solution of 1:1 electrolyte by the Equation (17) [20]:…”

Section: Dlvo Theorymentioning

confidence: 99%

“…Generally, the DLVO theory can describe the heterocoagulation of colloidal particles in aqueous solution. On the other hand, Otsuki et al (2007) [18] applied the DLVO theory for evaluating the heterocoagulation of colloidal particles in a polar organic solvent because the polar organic solvent they used had a similar dielectric coefficient (ε r ) to aqueous solution, and the electrolyte concentration was substituted by the surfactant concentration (c) for calculating the total potential energy, adapting the method described by [20].…”

Section: Dlvo Theorymentioning

confidence: 99%

See 4 more Smart Citations

Two-Liquid Flotation for Separating Mixtures of Ultra-Fine Rare Earth Fluorescent Powders for Material Recycling—A Review

Otsuki

Dodbiba

Fujita

2018

Colloids and Interfaces

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This paper reviews two separation methods applying two-step two-liquid flotation for recovering ultra-fine rare earth fluorescent powders (i.e., red, green, and blue). The paper aims to extract the science behind separation by two-liquid flotation, and to provide resulting engineering tips for material recycling. Two-liquid flotation, also called liquid-liquid extraction, involves two solvents (i.e., non-polar and polar solvents) to capture hydrophobic/hydrophobized particles at their interface, and a surfactant to selectively modify the surface property of the target powder(s). For separating a three powder mixture, two different developed flowsheets, composed of two-step separation are discussed. The major difference found was the polar solvents used. The first flowsheet (called the aqueous-organic system) employed water as a polar solvent while the second flowsheet (called the organic-organic system) utilized N,N-dimethylformamide, DMF as a polar solvent. The organic-organic system at the optimized conditions achieved both the grade and recovery of all the separated fluorescent powders at greater than 90% while the aqueous-organic system did not satisfy these criteria. This paper also reviews the mechanism behind the separation, as well as performing a cost comparison between the two methods. The cost comparison indicates that the organic-organic system is a more cost effective method for recovering rare earth fluorescent powders than the aqueous-organic system. Since the size of powders (i.e., several µm) is too small for the application of conventional separation technologies (e.g., froth flotation), two-liquid flotation is a unique pathway for the material recycling of ultra-fine rare earth fluorescent powders.

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Section: Heterocoagulation Of Particle and Non-polar Oil Dropletmentioning

confidence: 99%

Section: Heterocoagulation Of Particle and Non-polar Oil Dropletmentioning

confidence: 99%

Section: Dlvo Theorymentioning

confidence: 99%

“…The Debye-Huckel reciprocal length in Equation (15) is expressed for a solution of 1:1 electrolyte by the Equation (17) [20]:…”

Section: Dlvo Theorymentioning

confidence: 99%

Section: Dlvo Theorymentioning

confidence: 99%

See 3 more Smart Citations

Two-Liquid Flotation for Separating Mixtures of Ultra-Fine Rare Earth Fluorescent Powders for Material Recycling—A Review

Otsuki

Dodbiba

Fujita

2018

Colloids and Interfaces

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Selective Separation of Ultrafine Particles Using Two‐Liquid Flotation

Leistner

Müller

Erler

et al. 2014

Chemie Ingenieur Technik

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Die Vergrößerung des effizienten Anwendungsbereiches von Sortierprozessen in den Bereich feinster Partikelsysteme (0,1 -10 lm) stellt eine erhebliche Herausforderung für die Forschung dar. Ein möglicher Prozessansatz zur Verbesserung des Sortierergebnisses ist die Flüssig/Flüssig-Flotation. In dieser Studie werden Aussagen bezüglich Anwendbarkeit und Prozessverhalten dieses Ansatzes in Abhängigkeit von ausgewählten Prozessparametern an verschiedenen Modellpartikelsystemen präsentiert.Increasing the range of application of separation processes to effectively separate ultrafine particles (0.1 -10 lm) represents a significant research challenge. A possible process approach to enhance the separation result is two-liquid flotation. In this investigation, conclusions regarding the applicability and the process behavior of this approach are presented for different model particle systems with respect to selected process parameters. Abbildung 1. a) Vereinfachte schematische Darstellung des Prozessprinzips der Flüssig/Flüssig-Flotation sowie der möglichen Phasenzustände nach der Phasenseparation; b) Modellvorstellung eines kugelförmigen Feststoffpartikels, welches adsorbiert an einer ebenen Öl/Wasser-Grenzfläche vorliegt.Abbildung 2. Partikelgrößenverteilungen der verwendeten mineralischen Magnetit-und Quarzpartikel nach dem Zerkleinerungsvorgang.Abbildung 3. Vereinfachte schematische Darstellung der eingesetzten Prozessapparate Scheidetrichter und Trennsäule sowie Veranschaulichung der charakteristischen Phasen im Prozessraum.

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Tracking colloidal silica particles to evaluate their dispersion and interactions in concentrated suspensions under shear force applications

Saeed,

Otsuki,

Hermes

et al. 2024

Electrophoresis

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This study aimed to characterize interactions within colloidal silica particles in their concentrated suspensions, using rheo‐confocal measurements and imaging, followed by image analysis. We studied the effect of shear rate (0–500 s–1) and solution pH (6, 10) on the dispersion degree of colloidal silica particles via the determination and comparison of interparticle distances and their modeling. Images corresponding to different shear rates were analyzed to identify the coordinates of the particles. These coordinates were further analyzed to calculate the distance among the particles and then their surface‐to‐surface distance normalized by the particle diameter (H/D). It was found that the population of the particles per unit area of the image and H/D varied with increasing shear rate. The comparison between experimentally measured and theoretically calculated H/D identified that for some particles, the former was shorter than the latter, indicating the unexpected attractions among them against the Derjaguin–Landau–Verwey–Overbeek (DLVO) theory. Then, the modification of previously reported equations for H/D was suggested and confirmed its validity. Assuming pair potential interaction and hydrodynamic interaction were the main non‐DLVO interactions, their magnitudes were calculated and confirmed the significance of pH and shear application strength on particle dispersion/coagulation.

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The role of zeta potentials of oil droplets and quartz particles during collectorless liquid-liquid extraction

Cited by 21 publications

References 13 publications

Two-Liquid Flotation for Separating Mixtures of Ultra-Fine Rare Earth Fluorescent Powders for Material Recycling—A Review

Two-Liquid Flotation for Separating Mixtures of Ultra-Fine Rare Earth Fluorescent Powders for Material Recycling—A Review

Selective Separation of Ultrafine Particles Using Two‐Liquid Flotation

Tracking colloidal silica particles to evaluate their dispersion and interactions in concentrated suspensions under shear force applications

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