The strength and fractal dimension characteristics of alum–kaolin flocs

Li, Tao; Zhu, Zhe; Wang, Dongsheng; Yao, Chonghua; Tang, Hongxiao

doi:10.1016/j.minpro.2006.09.012

Cited by 105 publications

(55 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The stock suspension of kaolin was prepared in deionized water, which was similar to Li et al (2007). The solid concentration of suspension was determined by gravimetrically to be 137 g/L.…”

Section: Suspensionmentioning

confidence: 99%

Characterization of kaolin flocs formed by polyacrylamide as flocculation aids

Zhu

et al. 2009

International Journal of Mineral Processing

Self Cite

View full text Add to dashboard Cite

a b s t r a c t a r t i c l e i n f oAlthough the synthetic organic polymers have been widely applied as flocculant aids to improve solid-liquid separation efficiency, it is not very clear how the charge type and molecular weight of the polymers influence the characteristics of flocs. In this paper, floc characteristics, such as floc size, density, structure, strength and reversibility were investigated in details in terms of their response to the polyacrylamide (PAM) with different charge types and molecular weights. Laser light scattering, image analysis and settling technology were employed simultaneously. The results showed that floc size induced by anionic PAM with medium molecular weight (A130) and ultra high molecular weight (A115) was 419 µm and 438 µm respectively, correspondingly, floc size induced by cationic PAM with medium molecular weight (C448) and very high molecular weight (C498) was 731 µm and 796 µm. Meanwhile, floc fractal dimension was inversely proportional to polymer molecular weight and the values were between 1.91 and 2.40. In addition, floc density was affected by molecular weight of anionic PAM more dramatically than that of cationic PAM. For a given floc size, the density increased with molecular weight. Furthermore, flocs formed by cationic PAM showed much greater shear-resistant ability and reversibility than anionic PAM. Nevertheless, the poor reversibility of the flocs formed by high molecular weight was also observed. An explanation for the resultant floc characteristics was offered in terms of flocculation mechanisms.

show abstract

Section: Suspensionmentioning

confidence: 99%

Characterization of kaolin flocs formed by polyacrylamide as flocculation aids

Zhu

et al. 2009

International Journal of Mineral Processing

Self Cite

View full text Add to dashboard Cite

show abstract

“…However, for cationic polyelectrolytes, the re-growth of broken flocs occurred to a much greater extent. Li et al [14] and Yu et al [15] also showed that broken kaolin flocs were difficult to re-grow when alum was used. Increased humic acid concentration had a slight influence on the cohesion of kaolin flocs and resulted in much worse floc re-growth [16,17].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the property of kaolin–alum flocs at acidic pH

Gregory

Liu

et al. 2014

Colloids and Surfaces A: Physicochemical and Engineering Aspect

View full text Add to dashboard Cite

“…The floc size, strength and compaction of flocs may significantly affect the efficiency of solid/liquid separation [16]. Floc strength could be measured by applying an increasing shear rate to the preformed flocs and relating the energy dissipation to the broken floc size [17]. Fractal dimension and particle size of flocs are generally recognized as two important physical properties which have significant impacts on the efficiency of unit processes in water treatment works.…”

Section: Introductionmentioning

confidence: 99%