Application of the DLVO theory for particle deposition problems

Adamczyk, Zbǐgniew; Weroński, Paweł

doi:10.1016/s0001-8686(99)00009-3

Cited by 258 publications

(178 citation statements)

References 201 publications

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“…Many previous studies demonstrated that the slime coating on the mineral surface was dominated by electrostatic forces [34,35,44,45]. The heterocoagulation phenomenon can be explained by the Derjaguin-Landau-Verwey-Overbeek (DLVO) theory [61,62], in which the total energy V T between chalcopyrite particles and Mg(OH) 2 colloids equals Van der Waals interaction energy V W and electrostatic double-layer interaction energy V E , according to Equation (4) [61,63].…”

Section: Mechanismsmentioning

confidence: 99%

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The Influencing Mechanisms of Sodium Hexametaphosphate on Chalcopyrite Flotation in the Presence of MgCl2 and CaCl2

Xiao

et al. 2018

Minerals

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Sea water has been used in flotation plants, showing a promising way to save fresh water usage. Previous studies indicated that divalent salts in sea water played negative roles in chalcopyrite flotation, but not much work have been conducted to understand the eliminating mechanisms. This study systematically investigated the effects of divalent cations of Ca 2+ and Mg 2+ on natural flotability of chalcopyrite in the absence of collectors and frothers. The reduced recovery was mainly due to the adsorption of Mg and Ca hydroxyl complexes and precipitation on chalcopyrite surfaces, giving rise to a less hydrophobic surface. The addition of sodium hexametaphosphate (SHMP), however, significantly improved chalcopyrite recovery. Species calculation, contact angle, zeta potential, FTIR and XPS analyses were conducted to understand the influencing mechanisms of divalent ions and the beneficial effects of SHMP on chalcopyrite recovery. The primary mechanism was that SHMP prevented the adsorption of positively charged Mg and Ca compounds or precipitation with hydrophilic properties such as Mg(OH) 2 on chalcopyrite surfaces, confirmed by the Derjguin-Landau-Verwey-Overbeek (DLVO) theory. Secondly, SHMP reacted with Mg 2+ and Ca 2+ to form dissolvable complexes, thereby declining the formation of insoluble Mg 2+ and Ca 2+ compounds or precipitation.

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Section: Mechanismsmentioning

confidence: 99%

“…κ −1 is the thickness of electric double-layer, κ = 0.180 nm −1 [34]. Usually, a more negative V T between particles indicates a more stronger attraction force while a more positive V T reveals a more stronger repulsive force [61,62]. Figure 14 shows V T between chalcopyrite and Mg(OH) 2 colloids with and without SHMP.…”

Section: Mechanismsmentioning

confidence: 99%

The Influencing Mechanisms of Sodium Hexametaphosphate on Chalcopyrite Flotation in the Presence of MgCl2 and CaCl2

Xiao

et al. 2018

Minerals

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“…Numerous researchers [2][3][4][5][6][7] have found that electrolyte type, concentration, pH, organic matter, and oxidation-reduction potential can a®ect the aggregation process. Presently, 8,9 the Derjaguin-Landau-Verwey-Overbeek (DLVO) theory is often used to explain the relationship between van der Waals attraction and electrostatic repulsion of colloidal particles in aqueous systems. When the electrolyte concentration decreases, the electrostatic shielding is weakened and the electric double layer is thickened; consequently, van der Waals attraction is reduced and electrostatic repulsion becomes dominant, allowing colloidal particles to disperse and remain stable.…”

Section: Introductionmentioning

confidence: 99%

EFFECT OF NONCLASSICAL POLARIZATION OF Na+ AND K+ ON THE STABILITY OF SOIL COLLOIDAL PARTICLES IN SUSPENSION

Ding

Wang

et al. 2017

Surf. Rev. Lett.

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The study of soil colloids is essential because the stability of soil colloidal particles are important processes of interest to researchers in environmental¯elds. The strong nonclassical polarization of the adsorbed cations (Na þ and K þ Þ decreased the electric¯eld and the electrostatic repulsion between adjacent colloidal particles. The decrease of the absolute values of surface potential was greater for K þ than for Na þ . The lower the concentration of Na þ and K þ in soil colloids, the greater the electrostatic repulsion between adjacent colloidal particles. The net pressure and the electrostatic repulsion was greater for Na þ than for K þ at the same ion concentration. For K þ and Na þ concentrations higher than 50 mmol L À1 or 100 mmol L À1 , there was a net negative (or attractive) pressure between two adjacent soil particles. The increasing total average aggregation (TAA) rate of soil colloids with increasing Na þ and K þ concentrations exhibited two stages: the growth rates of TAA increased rapidly at¯rst and then increased slowly and eventually almost negligibly. The critical coagulation concentrations of soil colloids in Na þ and K þ were 91.6 mmol L À1 and 47.8 mmol L À1 , respectively, and these were similar to the concentrations at the net negative pressure.

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“…In order to fabricate ceramic green sheets with a high packing density and uniform microstructure, welldispersed slurry is strongly re quired. In general, aqueous slurries can be stabilized by electrostatic repulsion between particles by controlling the surface potential according to the DLVO theory 3) and the steric hindrance of adsorbed polymer. Polyelectrolyte molecules can combine these two eects, which leads to electrostatic and steric stabilization.…”

Section: Introductionmentioning

confidence: 99%

Dispersibility of BaTiO3 Aqueous Slurries with Poly Ammonium Acrylate Based Dispersant

Sakamoto

Nakaoka

Yogo

et al. 2003

J. Ceram. Soc. Japan

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Ùaeªaeç_ïÞÇ¡ÜnªUÜpC^BaTiO 3 nµåaeômªU« â{ ÂEªTqÞ E]êME½ìÁêÞThe dispersibility of aqueous BaTiO 3 slurries with poly ammonium acrylatebased dispersant has been inves tigated. BaTiO 3 particles were welldispersed in the high pH region and the adsorption behavior of disper sant strongly depended on the slurry pH. The dispersion of BaTiO 3 particles at various pH was also elucidat ed by characterizing the sedimentation density, viscosity of slurries, amount of adsorbed dispersant and tapecasted green sheets. The microstructures of green sheets fabricated using aqueous BaTiO 3 slurries were found to depend greatly upon the dispersion state of BaTiO 3 particles in the slurries.

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Application of the DLVO theory for particle deposition problems

Cited by 258 publications

References 201 publications

The Influencing Mechanisms of Sodium Hexametaphosphate on Chalcopyrite Flotation in the Presence of MgCl2 and CaCl2

The Influencing Mechanisms of Sodium Hexametaphosphate on Chalcopyrite Flotation in the Presence of MgCl2 and CaCl2

EFFECT OF NONCLASSICAL POLARIZATION OF Na+ AND K+ ON THE STABILITY OF SOIL COLLOIDAL PARTICLES IN SUSPENSION

Dispersibility of BaTiO3 Aqueous Slurries with Poly Ammonium Acrylate Based Dispersant

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