Shear flocculation of celestite with anionic surfactants and effects of some inorganic dispersants

Özkan, A.; Ucbeyiay, H.; Aydoğan, Salih

doi:10.1016/j.colsurfa.2006.02.020

Cited by 26 publications

(4 citation statements)

References 16 publications

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“…As can be seen, while sodium oleate was more effective on the talc suspension than Aero 801 (a petroleum sulfonate) and sodium dodecyl sulfate, a slow increase in the flocculation of talc particles could be observed in the presence of SDS. It is known that long-chain surfactants are more effective for obtaining a good flocculation (Ozkan, Ucbeyiay, and Aydogan 2006) because the hydrocarbon chain association depends on the carbon number of adsorbed surfactant chain (Zollars and Ali 1986). Consequently, this result confirms that the longer the surfactant chain, the more powerful the flocculation.…”

Section: Resultsmentioning

confidence: 53%

“…The greater the surface charge, the higher the energy barrier. Hence, the critical shear rate required for the flocculation of mineral suspensions should decrease with decreasing surface charge (Warren 1992;Ozkan, Ucbeyiay, and Aydogan 2006). As seen from Figure 4, the prolonged flocculation time did not increase the flocculation of talc particles after reaching a maximum aggregation degree at a flocculation time of 3 min and a significant decrease arising from a floc rupturing process at flocculation times above this optimum value was not observed in the flocculation of talc fines.…”

Section: Resultsmentioning

confidence: 98%

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Hydrophobic flocculation of talc with kerosene and effects of anionic surfactants

Özkan

Dudnik

Esmeli

2015

Particulate Science and Technology

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The variation of the hydrophobic flocculation behavior of talc mineral with pH, kerosene concentration, stirring speed, flocculation and settling times was investigated. The experimental studies showed that the flocculation of talc suspension increased to a particular point with increasing kerosene concentration and thereafter decreased slightly. Also, the flocculation with kerosene was not much affected by the pH changes of the suspension. On the other hand, sodium oleate, sodium dodecyl sulfate (SDS) and Aero 801 used as anionic surfactant in conjunction with kerosene provided significant increases in the flocculation of talc, depend on increasing Downloaded by [New York University] at 22:14 05 August 20152 surface hydrophobicity of the particles. Especially, in the presence of sodium oleate along with kerosene, the talc suspension could be flocculated with a recovery of 95%. Consequently, the enhancement with non-polar oil was more significant for the hydrophobic flocculation of talc suspension promoted by long hydrocarbon chain surfactant (sodium oleate) than short hydrocarbon chain surfactants (SDS and Aero 801).

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Section: Resultsmentioning

confidence: 53%

Section: Resultsmentioning

confidence: 98%

Hydrophobic flocculation of talc with kerosene and effects of anionic surfactants

Özkan

Dudnik

Esmeli

2015

Particulate Science and Technology

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“…SIPX, the longer-chain surfactant, was more effective than PEX. Long-chain surfactants are known to be more effective in flocculation because the hydrocarbon chain association depends on the carbon number of the adsorbed surfactant chain (Zollars and Ali, 1986;Ozkan, Ucbeyiay, and Aydogan, 2006).…”

Section: Resultsmentioning

confidence: 99%

Enhancement of shear flocculation of a galena suspension by ultrasonic treatment

Esmeli,

Ozkan

2023

J. S. Afr. Inst. Min. Metall.

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The enhancement of shear flocculation of a galena suspension by ultrasound in the presence of sodium isopropyl xanthate and potassium ethyl xanthate was investigated by studying the effects of surfactant concentration on flocculation efficiency, contact angle, and zeta potential. Strong flocculation was obtained under alkaline conditions (pH > 9) and a high ultrasound power level (150 W). Although the ultrasonic treatment increased the negativity of the zeta potential of the galena particles, this did not decrease the flocculation efficiency, thereby showing that the hydrophobic interactions between the particle were stronger than the electrical double-layer repulsion resulting from xanthate adsorption. The findings indicate that the ultrasonic treatment promoted the adsorption of surfactants onto the mineral surfaces.

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“…In recent years, minerals and their natural or modified forms have been investigated as adsorbent (Deosarkar and Pangarkar 2004;Li et al 2005;Zulkali et al 2006;Kumar and Silvanesan 2006). Examples, such as celestite (Ozkan et al 2006), bentonite , chrysotile (Valentin and Joekes 2006a), bauxite (Bhakat et al 2006), talc mineral (Casanova et al 2007), montmorillonite clays (Khaldoun et al 2006) and kaolin (Wan and Liu 2006) have been recently reported in the literature.…”

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confidence: 99%

Adsorbents for acetone in cyclohexane effuent employed in Ziegler-Natta catalyst process

et al. 2008

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Adsorption of acetone from cyclohexane on silica, alumina, coal, natural and leached chrysotile was investigated. Adsorption phenomenon was investigated by non-linear fitting, considering the Langmuir or Freundlich models. According to non-linear regression, coal present the highest K L (12.07) and K F (9.115) parameters. Silica and leached chrysotile exhibited similar behavior in terms of both K L and K F parameters. Alumina presented the highest adsorption capacity according to both Langmuir (q m = 58.689) and Freundlich (1/n = 0.844) models. Nonsupported Ziegler-Natta catalyst systems were shown to be more sensitive to acetone contamination. For the polymerization reactions carried on with contaminated solvent after the percolation through the adsorbents, good results were observed in the case of silica and alumina. Coal was not suitable for use in this catalyst system, probably due to leaching of organic components by the solvent (cyclohexane).

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Shear flocculation of celestite with anionic surfactants and effects of some inorganic dispersants

Cited by 26 publications

References 16 publications

Hydrophobic flocculation of talc with kerosene and effects of anionic surfactants

Hydrophobic flocculation of talc with kerosene and effects of anionic surfactants

Enhancement of shear flocculation of a galena suspension by ultrasonic treatment

Adsorbents for acetone in cyclohexane effuent employed in Ziegler-Natta catalyst process

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