Point of Zero Charge, Isoelectric Point and Aggregation of Phyllosilicate Minerals

Álvarez-Silva, M.; Mirnezami, M.; Uribe‐Salas, A.; Finch, J.A.

doi:10.1179/cmq.2010.49.4.405

Cited by 22 publications

(13 citation statements)

References 19 publications

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“…Exploring electrical charge on the talc surface in various conditions indicated that its zeta potential (ZP) magnitude is negative at wide pH ranges (pH 2-12) [13][14][15][16]20,28,42]. This may be attributed to the Mg-OH and Si-OH groups ionization, passing of H+ into the water, and OH ions in water adsorbed on Si + and Mg + that may appear on the talc surface [43]. Different studies reported the isoelectric point (IEP) of talc occurred at around pH 2-3 (Table 4).…”

Section: Zeta Potentialmentioning

confidence: 99%

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Talc Flotation—An Overview

et al. 2021

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Talc is a naturally hydrophobic gangue mineral in most sulfide ores. However, talc has vast applications in the cosmetics, paper, and paint industries due to its high chemical stability, and its demand continues to grow. Since flotation is the most effective beneficiation technique for upgrading sulfides, the high hydrophobicity of talc has made its selective separation challenging. This paper explored the different properties of talc and the different factors that affect its flotation separation performance as a proven versatile beneficiation technique. Surface properties, zeta potential measurements, contact angles, and other factors affecting the talc flotation efficiency were discussed in detail. It was observed that the surface face/edge ratio (particle size) has a direct relationship with the level of talc hydrophobicity. Talc surfaces are negatively charged in a wide pH range (pH 2–12). Different depressants have already been studied; however, most of them showed low selectivity. The addition of ions such as Ca2+ could enhance talc depression. Pretreatment methods such as ultrasonic and thermal treatments were reported to decrease the talc floatability. It was demonstrated that the development of new selective depressants or pretreatment options for talc flotation requires attention in future investigations to improve its selective separation.

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Section: Zeta Potentialmentioning

confidence: 99%

“…The MIBC had the least frother adsorption capacity. [43,55] MIBC By using MIBC, the talc recovery reached more than 80% [24] Polypropylene glycol…”

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confidence: 99%

Talc Flotation—An Overview

et al. 2021

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“…3−6 The amino talclike clay has a positive ζ potential, while talc has a negative ζ potential in its given pH. 2,7 Additional properties by the introduction of an aminoalkyl ligand on the surface of talc result in the increase in active sites on the surface and the increase in stability in a colloidal system. 2,8 Furthermore, the amino clay with fewer layers (delaminated amino clay) and the amino clay with more layers (lamellar amino clay) have been synthesized.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Amino talc-like synthetic clay, a type of synthetic smectite clay, has been developed by introducing an aminoalkyl surfactant to the clay surface. Amino talc-like clay has some different properties from talc as the parent material. − The amino talc-like clay has a positive ζ potential, while talc has a negative ζ potential in its given pH. , Additional properties by the introduction of an aminoalkyl ligand on the surface of talc result in the increase in active sites on the surface and the increase in stability in a colloidal system. , …”

Section: Introductionmentioning

confidence: 99%

Cs Adsorption and CsCl Particle Formation Facilitated by Amino Talc-like Clay in Aqueous Solutions at Room Temperature

Basuki

Nakashima

2021

ACS Omega

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Amino talc-like clay with an increased number of active sites and dispersion in a colloidal system has been synthesized and used for contaminant adsorption and support for nanoparticle formation. Amino talc-like clays having different number of layers and aminoalkyl ligands were synthesized and their Cs uptake behavior was examined. Cs uptake through Cs adsorption and CsCl particle formation facilitated by amino talc-like clay in a colloidal aqueous solution at room temperature are reported. The amino talc-like clay demonstrated better Cs uptake with a high initial Cs concentration than talc and montmorillonite. This might have been caused by a high concentration of trapped Cs and Cl ions in exfoliated amino clay, which eventually became CsCl particles. The formation of the CsCl particles in the amino clay depended on the clay concentration and ethanol treatment. The exfoliation of the basal sheets of the amino clay as a result of a high salt concentration and the protonation of amine induced by ethanol treatment was shown to be a precondition for CsCl particle formation. These results could promote amino talc-like clay for high-concentration Cs uptake and the green synthesis of Cs-halide particles in an aqueous solution.

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“…It was established that attachment or detachment of colloidal particles from pore walls and 4 following up their migration in porous media are determined by the balance of forces acting between the particles 5 and the rock mineral grains surfaces. The attachment occurs thanks to Londonvan der Waals attraction forces 6. The detachment can be triggered by combined effect of repulsive forces such as the electrostatic repulsion of7 overlapping electrical double layers (EDL), if the surface charge of clay particles and the rock matrix has the same 8 sign, structural forces of bound water, hydrodynamic drive of flowing fluid.…”

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confidence: 99%