The role of polymer adsorption kinetics in flocculation

Hogg, R.

doi:10.1016/s0927-7757(98)00723-7

Cited by 72 publications

(42 citation statements)

References 7 publications

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“…An influence upon the rate of floc breakage (6) and hence adsorption rate (9), is constant in this system, the rate of floc breakup is controlled by floc strength (18). Floc strength is directly related to a number of components: (a) particulate material properties, (b) solid loadings (10), (c) solution ionic strength (19), (d) pH, (e) flocculant dosage (6,19), (f ) flocculant chemistry, and (g) the number and /or rate of flocculant additions (20)(21)(22).…”

Section: Floc Size and Surface Area Analysismentioning

confidence: 99%

“…As a rule, polymer coverage in flocculated systems is generally low; e.g., flocculant dosage typically lies between about 0.05 and 0.5 mg/g solid whereas the maximum polymer adsorption corresponds to dosages of more than 1 mg/g (9). It is clear that as polymer adsorption takes place, and thus flocculation occurs, there is a rapid reduction in the available surface area which thereby inhibits further adsorption (3,7,9).…”

Section: Introductionmentioning

confidence: 99%

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Kinetics of Adsorption of High Molecular Weight Anionic Polyacrylamide onto Kaolinite: The Flocculation Process

Taylor

Morris

Self

et al. 2002

Journal of Colloid and Interface Science

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Section: Floc Size and Surface Area Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Kinetics of Adsorption of High Molecular Weight Anionic Polyacrylamide onto Kaolinite: The Flocculation Process

Taylor

Morris

Self

et al. 2002

Journal of Colloid and Interface Science

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“…Furthermore, it must also have an extended and flexible (elastic) configuration in the solution to achieve better particle bridging and to produce flocs capable of withstanding moderate shear forces without rupturing [1,8,19,[21][22][23]. The use of shear-sensitive polymers (e.g., high-molecular-weight PEO) has been of considerable interest in recent years due to their ability to produce thickened tails of solid loadings significantly greater than those achieved with conventional flocculants (e.g., PAM), under moderate shear conditions [11,12,[23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Temperature influence of nonionic polyethylene oxide and anionic polyacrylamide on flocculation and dewatering behavior of kaolinite dispersions

Mpofu

Addai‐Mensah

Ralston

2004

Journal of Colloid and Interface Science

140

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“…The actual dimensions of ionic polymers in a slurry of known composition increase with charge density as high intra-molecular charge repulsions of the polymer chain tend to unfold the solvated coils [13]. The contribution of polymer molecular weight depends on charge density and is considered to be embedded in the later.…”

Section: Resultsmentioning

confidence: 99%

Evaluation of slurry settling rate using fuzzy rule-based modeling

Azam

Sadiq

2006

Acta Geotech.

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/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://dx.doi.org/10.1007/s11440-006-0008-6Acta Geotechnica, 1, 3, pp. 149-156, 2006-12-01 Evaluation of slurry settling rate using fuzzy rule-based modeling Azam, S.; Sadiq, R.http://irc.nrc-cnrc.gc.ca Evaluation of slurry settling rate using fuzzy rule-based modeling NRCC-49459Azam, S.; Sadiq, R. AbstractThe pressure acid leach process is the most widely used method of metal extraction from laterite ores. The self-weight settling rate of the ore slurries governs the throughput of the process and is improved by adding synthetic polymers. The charge density, molecular weight, and dosage of the polymers are the key factors influencing the settling rate of the slurries. This interdisciplinary paper uses the geotechnical understanding of hindered sedimentation for a mining engineering application. A conceptual fuzzy rule-based model was developed to evaluate the initial hydraulic conductivity of polymer-modified laterite ore slurries. Identification of control parameters and selection of the model architecture (fuzzy rule-base) were based on expert judgement. The developed model was trained and validated using bench-scale settling test data. The model reasonably predicts the initial hydraulic conductivity of polymer-added laterite ore slurry with a coefficient of determination of 0.75. Rank correlation coefficient based sensitivity analyses indicated that charge density was the most significant polymer parameter followed by molecular weight and then by dosage. Charge density accounted for more than 97% of variability in the initial hydraulic conductivity estimates for both anionic and cationic polymers.

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The role of polymer adsorption kinetics in flocculation

Cited by 72 publications

References 7 publications

Kinetics of Adsorption of High Molecular Weight Anionic Polyacrylamide onto Kaolinite: The Flocculation Process

Kinetics of Adsorption of High Molecular Weight Anionic Polyacrylamide onto Kaolinite: The Flocculation Process

Temperature influence of nonionic polyethylene oxide and anionic polyacrylamide on flocculation and dewatering behavior of kaolinite dispersions

Evaluation of slurry settling rate using fuzzy rule-based modeling

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