Using electrophoresis for determining the mechanism of amine, sulfate and oleate adsorption on calcite

Andersen, Jane; El-Mofty, S. E.; Somasundaran, P.

doi:10.1016/0166-6622(91)80106-x

Cited by 22 publications

(10 citation statements)

References 2 publications

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“…Taggart and Arbiter (1944), considered that the adsorption of amine is the result of an ion exchange, while Dobias and Spurny (1960) considered that electrostatic attraction is the main mechanism of the amines adsorption onto calcite. Andersen et al (1991) showed that at pH 9.8, the amine tends to adsorbs on the negatively charged calcite surface. They considered that the adsorption mechanism of amine onto calcite was mainly due to the electrostatic attraction.…”

Section: Flotation Study Of Ca-bearing Minerals With a Mixture Of Amimentioning

confidence: 98%

“…Amines are known to be effective flotation reagents for silicates in all pH range (Sekulić et al, 2004;Fuerstenau and Pradip, 2005). The adsorption mechanism of amines onto the silicates and calcites surface was elucidated by many searchers (Buckenham and Rogers, 1954;Sandvik and Solbakken, 1968;Smith and Akhtar, 1976;Smith and Scott, 1990;Andersen et al, 1991). It is also reported in literature that flotation of quartz (with amine) is inhibited due to the adsorption of Ca 2+ on its surface (Hopstock and Agar, 1968;Scott and Smith, 1993).…”

Section: Low Grade Ores and Rare Metalsmentioning

confidence: 98%

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Selective flotation of silicates and Ca-bearing minerals: The role of non-ionic reagent on cationic flotation

Filippov

Duverger

Filippova

et al. 2012

Minerals Engineering

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Section: Flotation Study Of Ca-bearing Minerals With a Mixture Of Amimentioning

confidence: 98%

Section: Low Grade Ores and Rare Metalsmentioning

confidence: 98%

Selective flotation of silicates and Ca-bearing minerals: The role of non-ionic reagent on cationic flotation

Filippov

Duverger

Filippova

et al. 2012

Minerals Engineering

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“…At higher concentrations of salts, zeta potential of the particles increases toward less negative values. The mechanisms of adsorption of sulphate ions on calcite surfaces could be due to interaction with crystal lattice cations, as well as specific adsorption in the Stern layer [47] or electrostatic interactions [48]. Andersen et al [47] argued that sulphate adsorbs on calcite surfaces due to chemical interactions on the basis of experimental zeta potential measurements of calcite surfaces.…”

Section: Effect Of Anionsmentioning

confidence: 99%

Mechanisms of Surface Charge Modification of Carbonates in Aqueous Electrolyte Solutions

Derkani

Fletcher

Fedorov

et al. 2019

Colloids and Interfaces

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The influence of different types of salts (NaCl, CaCl 2 , MgCl 2 , NaHCO 3 , and Na 2 SO 4 ) on the surface characteristics of unconditioned calcite and dolomite particles, and conditioned with stearic acid, was investigated. This study used zeta potential measurements to gain fundamental understanding of physico-chemical mechanisms involved in surface charge modification of carbonate minerals in the presence of diluted salt solutions. By increasing the salt concentration of divalent cationic salt solution (CaCl 2 and MgCl 2 ), the zeta potential of calcite particles was altered, resulting in charge reversal from negative to positive, while dolomite particles maintained positive zeta potential. This is due to the adsorption of potential-determining cations (Ca 2 + and Mg 2 + ), and consequent changes in the structure of the diffuse layer, predominantly driven by coulombic interactions. On the other hand, chemical adsorption of potential-determining anions (HCO 3 - and SO 4 2 - ) maintained the negative zeta potential of carbonate surfaces and increased its magnitude up to 10 mM, before decreasing at higher salt concentrations. Physisorption of stearic acid molecules on the calcite and dolomite surfaces changed the zeta potential to more negative values in all solutions. It is argued that divalent cations (Ca 2 + and Mg 2 + ) would result in positive and neutral complexes with stearic acid molecules, which may result in strongly bound stearic acid films, whereas ions resulting in negative mineral surface charges (SO 4 2 - and HCO 3 - ) will cause stearic acid films to be loosely bound to the carbonate mineral surfaces. The suggested mechanism for surface charge modification of carbonates, in the presence of different ions, is changes in both distribution of ions in the diffuse layer and its structure as a result of ion adsorption to the crystal lattice by having a positive contribution to the disjoining pressures when changing electrolyte concentration. This work extends the current knowledge base for dynamic water injection design by determining the effect of salt concentration on surface electrostatics.

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“…Because the head groups of all of the surfactants are identical, the different behavior was initially unexpected, but it is apparently indicative of the competition between surfactant adsorption and its solubility in water, which is a function of hydrocarbon chain length, as discussed below. 17 The shortest surfactant, C 8 TAB, has little influence on the zeta potential of Si 3 N 4 (pH 5). The intermediate length surfactants, C 10 TAB and C 12 TAB, affect the magnitude of the zeta potential and increase the IEP to pH 8.…”

Section: (5) Consolidationmentioning

confidence: 99%

“…Adsorbed cationic surfactants were expected to shift the isoelectric point (IEP) of Si 3 N 4 . 17 That is, the cationic surfactant molecules had a positively charged head group that could be attracted to the dominant negative surface sites of Si 3 N 4 particles at pH values >5 (the IEP of Si 3 N 4 ). Thus, zeta-potential measurements were used to determine the adsorption behavior of the cationic surfactants.…”

Section: (2) Adsorption Determinationsmentioning

confidence: 99%

Development of Short‐Range Repulsive Potentials by Short‐Chain Surfactants in Aqueous Slurries

Luther

Lange

Pearson

et al. 1999

Journal of the American Ceramic Society

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The effect of both cationic (n-trimethylammonium bromide, C n TAB) and zwitterionic (phosphocholine, C n C n PC) surfactants on the properties of aqueous slurries of Si 3 N 4 was studied. These surfactants were expected to adsorb to the surface of Si 3 N 4 particles to produce short-range repulsive interparticle potentials that might be useful for the colloidal processing of advanced ceramic powders. Electrophoretic, adsorption, and viscosity measurements showed that longer-chain-length surfactants (C n TAB, n ≥ 12, and C n C n PC, n ≥ 9) strongly adsorb. Surfactants with shorter chain lengths were highly soluble and did not adsorb. Although the C n TAB, n ≥ 12, surfactants produced very weak particle networks with a low viscosity, the packing density during consolidation was very low, and the bodies were brittle (cracked before plastic deformation). The lesssoluble, longer-chained C n C n PC, n ≥ 9, surfactants did produce high particle-packing densities but also produced brittle bodies. In all cases, it appeared that the surfactants could be pushed away from the surface during particle packing.

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Using electrophoresis for determining the mechanism of amine, sulfate and oleate adsorption on calcite

Cited by 22 publications

References 2 publications

Selective flotation of silicates and Ca-bearing minerals: The role of non-ionic reagent on cationic flotation

Selective flotation of silicates and Ca-bearing minerals: The role of non-ionic reagent on cationic flotation

Mechanisms of Surface Charge Modification of Carbonates in Aqueous Electrolyte Solutions

Development of Short‐Range Repulsive Potentials by Short‐Chain Surfactants in Aqueous Slurries

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