The influence of phenolic cofactors on the properties of calcium carbonate flocs formed with PEO

Goto, Shisei; Pelton, Robert

doi:10.1016/s0927-7757(98)00780-8

Cited by 7 publications

(3 citation statements)

References 15 publications

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“…Flocculation with PEO requires the presence of a cofactor, such as PFR, to obtain high flocculation [18]. From the preliminary tests, the effect of the cofactor/PEO ratio on the flocculation of clay was studied.…”

Section: Dual Polymer Systemsmentioning

confidence: 99%

Flocculation and reflocculation of clay suspension by different polymer systems under turbulent conditions

Yoon

Deng

2004

Journal of Colloid and Interface Science

116

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Section: Dual Polymer Systemsmentioning

confidence: 99%

Flocculation and reflocculation of clay suspension by different polymer systems under turbulent conditions

Yoon

Deng

2004

Journal of Colloid and Interface Science

116

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“…Figure 6 shows that, generally, the aggregate strength is similar when they are induced by PVFA/NaAA and starch, while the PEO/cofactor system gives somewhat weaker aggregates at high shear rates. It is worth mentioning that the current cofactor/PEO ratio is 4.5:1, while Goto and Pelton, 73 using a different cofactor, reported that the maximum scalenohedral PCC floc strength corresponded to a ratio of 2−3:1. They found that the flocs broke up when exerting an extensional force of about 100−140 nN.…”

Section: ■ Resultsmentioning

confidence: 92%

Structure and Strength of Flocs of Precipitated Calcium Carbonate Induced by Various Polymers Used in Papermaking

Gaudreault

Cesare

Ven

et al. 2015

Ind. Eng. Chem. Res.

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Because of persistent economic pressure on cost reduction, inorganic fillers such as precipitated calcium carbonate (PCC) have become increasingly economically attractive in the papermaking process. The increase of filler level in paper can be achieved by adding it to pulp prior to the headbox, either as individual filler particles or as preaggregates, while maintaining paper strength and minimizing their negative impact. Consequently, the floc structure and strength of PCC aggregates was studied using flocculants and dry strength agents, using static light scattering/diffraction (SLS), real time fluorescent video imaging (RTFVI), image analysis, photometric dispersion analysis (PDA), and scanning electron microscopy (SEM). It was found that PEO/cofactor induced PCC aggregates were weaker at high shear and far more irreversible than those induced by the partially hydrolyzed polyvinyl formamide copolymerized with acrylic acid (PVFA/NaAA) or cationic starch. Flocs produced at low polymer dosages were smaller and weaker than those produced at higher dosages. The number of discrete PCC particles in aggregates was measured using real time fluorescent video imaging combined with image analysis. Finally, we speculate that when two scalenohedral crystal type PCC particles aggregate, there is a small effective surface area to bind them, mainly through classical bridging or charge neutralization flocculation. Moreover, additional polymer adsorption results in higher coverage of the external and internal surfaces and prevents further aggregation due to electrosteric repulsion.

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“…Figure 7 shows that generally the aggregate strength is similar when they are induced by PVFA/NaAA and starch, while the PEO/cofactor system gives somewhat weaker aggregates at high shear rates. It is worth mentioning that the current cofactor:PEO ratio is 4.5:1, while Goto and Pelton [69], using a different cofactor, reported that the maximum scalenohedral PCC floc strength corresponded to a ratio of 2-3. They found that the flocs broke up when exerting an extensional force of about 100-140 nN.…”

Section: Strength Of Pcc Aggregates (Pda Experiments)mentioning

confidence: 91%

The Structure and Strength of Flocs of Precipitated Calcium Carbonate Induced by Various Polymers Used in Papermaking

Gaudreault,

Di Cesare,

van de Ven

et al. 2009

Trans. Of the XIVth Fund. Res. Symp. Oxford, 2009

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When the percentage of ﬁller is increased in paper, the optical properties are improved and the production cost lowered. However, ﬁllers weaken paper strength by decreasing the ﬁbre-ﬁbre bonded area. Little is known about the optimum ﬁller ﬂoc size or ﬁller ﬂoc properties to allow developing optimum paper characteristics. Consequently, the ﬂoc structure and strength of precipitated calcium carbonate (PCC) aggregates was studied using various polymers (ﬂocculants and dry strength agents): by static light scattering/diffraction (SLS), real time ﬂuorescent video imaging, image analysis, photometric dispersion analysis (PDA) and scanning electron microscopy (SEM). It was found that PEO/cofactor induced PCC aggregates were weaker at high shear and far more irreversible than those induced by the partially hydrolysed polyvinyl formamide copolymerised with acrylic acid (PVFA/NaAA) or C-starch. Flocs produced at low polymer dosages were smaller and weaker than those produced at higher dosages. The number of discrete PCC particles in aggregates was measured using real time ﬂuorescent video imaging combined with image analysis.

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The influence of phenolic cofactors on the properties of calcium carbonate flocs formed with PEO

Cited by 7 publications

References 15 publications

Flocculation and reflocculation of clay suspension by different polymer systems under turbulent conditions

Flocculation and reflocculation of clay suspension by different polymer systems under turbulent conditions

Structure and Strength of Flocs of Precipitated Calcium Carbonate Induced by Various Polymers Used in Papermaking

The Structure and Strength of Flocs of Precipitated Calcium Carbonate Induced by Various Polymers Used in Papermaking

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