A Method of Calculating the Interaction Energy between Particles in Minerals Flotation

Yao, Jin; Han, Hua; Hou, Ying; Gong, Enpu; Yin, Wanzhong

doi:10.1155/2016/8430745

Cited by 18 publications

(10 citation statements)

References 56 publications

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“…accepted ranges for particle-bubble interactions (Israelachvili and Pashley, 1982;Eriksson et al, 1989;Ducker et al, 1994;Yao et al, 2016). Already when the HAC concentration was 0.667 mg HAC /m 2 QRZ , non-compressive attachments between QRZ particles and air bubbles occurred, proving that HAC renders the mineral surface more hydrophobic, in line with earlier studies (Laitinen et al, 2016;Hartmann et al, 2017Hartmann et al, , 2018.…”

Section: Probability Of Quartz-bubble Attachments In the Presence Ofsupporting

confidence: 82%

A Study on the Electric Surface Potential and Hydrophobicity of Quartz Particles in the Presence of Hexyl Amine Cellulose Nanocrystals and Their Correlation to Flotation

Hartmann

Serna-Guerrero

2020

Front. Mater.

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In this work, the study of hexyl amine cellulose nanocrystal (HAC) as a renewable and environmentally-friendly reagent for the flotation of quartz (QRZ) is expanded with a focus on the changes of electrical states at the solid-liquid interface, the range of solid-gas interactions, and their impact on flotation operations under a turbulent regime. Furthermore, particle-bubble attachment probabilities were measured with the recently engineered automated contact timer apparatus (ACTA), a versatile technique used to deduce the wettability of microparticles and potentially predict their floatability. Therefore, the findings of the ACTA proved that, with sufficiently hydrophobic QRZ (i.e., HAC concentration ≥ 0.667 mg HAC /m 2 QRZ), stable particle-bubble attachments occur at particle-bubble distances in the range of tens of micrometers. The distances for the successful attachment of HAC-coated QRZ particles exceed the range of interactions reported in literature so far and imply the existence of structural or hydrodynamic phenomena acting between particle and bubble surfaces. The occurrence of so-called non-compressive particle-bubble attachments is shown to correlate with a significant increase in the floatability of QRZ, where recoveries up to 90% were obtained. Based on the experimental results, some insights on the nature of the long-range interactions responsible for the particle-bubble attachment of hydrophobic particles are provided.

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Section: Probability Of Quartz-bubble Attachments In the Presence Ofsupporting

confidence: 82%

A Study on the Electric Surface Potential and Hydrophobicity of Quartz Particles in the Presence of Hexyl Amine Cellulose Nanocrystals and Their Correlation to Flotation

Hartmann

Serna-Guerrero

2020

Front. Mater.

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“…With the help of the ζ potential, V el between dissimilar spherical particles can be calculated according to eq 6 ( 49 ) Here, D QRZ and D HAC are the diameters of quartz and the projected area diameter ( d a ) of HAC and κ is the Debye length. V struc between quartz and HACs is given by 48 Here, l is the layer thickness of oriented water molecules on the quartz and HAC surface, which was assumed to be 1 nm, 52 H 0 is the minimum separation distance, set to 0.163 nm, 53 and γ + and γ – represent nondispersion interactions of quartz and HACs, respectively, and were measured in previous studies using the inverse gas chromatography technique (see Table 1 ). 7 The γ + and γ – values of quartz are functions of the partial coverage of the quartz surface with injected probe molecules and thus both maximum and minimum values of γ + and γ – were used for the calculations.…”

Section: Methodsmentioning

confidence: 99%

On the Colloidal Behavior of Cellulose Nanocrystals as a Hydrophobization Reagent for Mineral Particles

2021

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In the search for more sustainable alternatives to the chemical reagents currently used in froth flotation, the present work offers further insights into the behavior of functionalized cellulose nanocrystals as mineral hydrophobization agents. The study corroborates that hexylamine cellulose nanocrystals (HACs) are an efficient collector for the flotation of quartz and also identifies some particular characteristics as a result of their colloidal nature, as opposed to the water-soluble reagents conventionally used. To investigate the individual and collective effects of the frother and HACs on the attachment of particles and air bubbles, an automated contact timer apparatus was used. This induction timer measures particle-bubble attachment probabilities ( P att ) without the influence of macroscopic factors present in typical flotation experiments. This allowed the study of the combined influence of nanocellulose and frother concentration on P att for the first time. While HACs readily adsorb on quartz modifying its wettability, the presence of a frother leads to a drastic reduction in P att up to 70%. The improved recovery of quartz in flotation cells might thus be attributed to froth stabilization by HACs, perhaps acting as a Pickering foam stabilizer. Among the main findings, a tendency of HACs to form mineral agglomerates was identified and further explained using the extended DLVO theory in combination with measured adsorption rates in a quartz crystal microbalance. Therefore, this study distinguishes for the first time the antagonistic effect of frothers on P att and their synergies with HACs on the stabilization of orthokinetic froths through the hydrophobization mechanism unlike those of typical water-soluble collectors.

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“…Besides the experimental approaches, theoretical viewpoints were also used for modeling both bubble-particle and particle-particle interactions that occur during flotation and aggregation processes (Mao, 1998;Liu and Zu, 2007;Guven et al, 2015;Yao et al, 2016;Xing et al, 2017). In this context, the application of classical DLVO (Derjaguin-Landau-Verwey-Overbeek) theory has been used for modeling both stabilization and destabilization of charged colloidal particles under different conditions for almost a century (Suresh and Walz, 1996;Gao et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Analysis of flotation and aggregation characteristics of muscovite particles through the extended DLVO theory

Tunç¹,

Güven²,

Özdemir³

et al. 2022

Physicochem. Probl. Miner. Process.

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In this study, the flotation and aggregation characteristics of muscovite mineral particles were determined as a function of dodecyl amine hydrochloride (DAH) concentration and correlated with the theoretically calculated "particle-particle" and "particle-bubble" interactions using extended DLVO theory. In this series of tests, the flotation and aggregation characteristics of the muscovite mineral were determined with micro-flotation and turbidity measurements, respectively. In addition to these analyses, surface tension measurements were carried out as a function of pH. Also, the zeta potential and contact angle measurements were also performed as a function of DAH concentration prior to the flotation and aggregation tests. The experimental studies showed that while almost minimum and maximum points of flotation and turbidity values were obtained up to a critical concentration of DAH as 6.10 -6 mol/dm 3, a significant increment was obtained following that concentration. Accordingly, while repulsive forces dominated the interactions up to that concentration, the attractive forces became more effective at further concentrations such as 2.10 -5 , 4.10 -5 , 8.10 -5 , and 1.10 -4 mol/dm 3 DAH concentrations for both "particle-particle" and "particle-bubble" interactions. This in turn suggested that the determination of energy barrier heights between "particle-particle" and "particle bubble" may provide important insights into both flotation and aggregation characteristics of particles.

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A Method of Calculating the Interaction Energy between Particles in Minerals Flotation

Cited by 18 publications

References 56 publications

A Study on the Electric Surface Potential and Hydrophobicity of Quartz Particles in the Presence of Hexyl Amine Cellulose Nanocrystals and Their Correlation to Flotation

A Study on the Electric Surface Potential and Hydrophobicity of Quartz Particles in the Presence of Hexyl Amine Cellulose Nanocrystals and Their Correlation to Flotation

On the Colloidal Behavior of Cellulose Nanocrystals as a Hydrophobization Reagent for Mineral Particles

Analysis of flotation and aggregation characteristics of muscovite particles through the extended DLVO theory

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