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Differently from the removal efficiency of water turbidity after sedimentation, ... kaolin (Al 2 Si 2 O 5 (OH) ... In the present study, the role of cationic, anionic and nonionic polyacrylamides (PAMs) in ballasted flocculation of clay suspensions was comparatively evaluated at three representative dosages of aluminum sulfate (AS) …
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The effect of high molecular weight polyacrylamide (PAAM; 5×106) and hydroquinone (HQ) on the sedimentation rate of kaolin suspensions was investigated by sedimentation, viscosimetric and UV ...
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The analytical centrifugation analyzer LUMisizer (LUM , Germany) was used to determine the sedimentation velocities of kaolin and KLD/kaolin foci. Each measurement involved adding 1.1 mL …
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Standard kaolin suspensions were flocculated using cationic polyacrylamides of similar high molar mass (2.6–2.7×106 g mol−1) but different charge densities (78–221 C g−1).
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The sedimentation performance of kaolin particles under non-stirring conditions in the absence or presence of KLD were assessed by a vertical scan analyzer, Turbiscan (Lab …
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ABSTRACT Based on 2D fractal dimension, the effect of aluminum ion (Al3+) on kaolinite flocculation using anionic polyacrylamides (APAMs) as flocculant has been investigated at pH 4. The settling performance was tested, and fractal dimensions of flocs were analyzed. The results show that the clearer the supernatant, the bigger fractal …
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The flocculation of kaolin suspensions with anionic polyacrylamides of varying molar mass and anionic character ... The influence of interactions between hydrolyzed aluminum ions and polyacrylamides on the sedimentation of kaolin suspensions. K. Roberts J ... HE KINETICS of sedimentation of particulate solids in liquid T m e d i a and the ...
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High molecular weight (106–3 × 107 Da) polyacrylamide (PAM) is commonly used as a flocculant in water and wastewater treatment, as a soil conditioner, and as a viscosity modifier and friction ...
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DOI: 10.1016/0021-9797(74)90178-7 Corpus ID: 95781430; The influence of interactions between hydrolyzed aluminum ions and polyacrylamides on the sedimentation of kaolin suspensions
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Request PDF | Polyacrylamides Revisited: Flocculation of Kaolin Suspensions and Mature Fine Tailings | A series of acrylamide-based water-soluble (co)polymers was synthesized and they were ...
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A series of acrylamide-based water-soluble (co)polymers was synthesized and they were investigated as flocculants of model kaolin suspensions and mature fine tailings of oil sands. The effects of molar mass, charge density, and polymer concentration on flocculation efficiency were studied by monitoring the initial settling rate during ...
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The sedimentation behaviors of Na- and Ca-kaolinite suspension in the presence of PEI were found dependent on both pH and nature of electrolytes, while their flocculation was …
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Semantic Scholar extracted view of "The flocculation of kaolin suspensions with cationic polyacrylamides of varying molar mass but the same cationic character" by R. Gill et al. ... cellulose (Avicel) and polyethylenimine (PEI) with various molecular weights were examined by observing sedimentation, electrophoresis and … Expand. 22. Save ...
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Uncharged and anionic copolymers Dextran-graft-Polyacrylamide (D-g-PAA) and linear PAA of similar molecular weight were tested as flocculants in model kaolin polydisperse suspensions (C = 3 g/dl) having high content of particles less than 2 μm in size (more than 60%) which are difficult to settle down.The flocculation process was …
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Figure B.7: Sedimentation time series for kaolin-PAM nanocomposite (20 mg·n-PAM/L). Blue dotted line denotes supernatant-suspension boundary and red solid line denotes suspension-sediment boundary. Mixed-Mode sedimentation ..... 75 Figure B.8: Sedimentation time series for kaolin-PAM nanocomposite (80 mg·n-PAM/L).
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DOI: 10.1016/J.CES.2017.10.031 Corpus ID: 104208244; Variations in the molecular weight response of anionic polyacrylamides under different flocculation conditions @article{Costine2018VariationsIT, title={Variations in the molecular weight response of anionic polyacrylamides under different flocculation conditions}, …
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The most widely used reagents to destabilize tailings particles and aggregates are high molecular weight anionic polyacrylamides (A-PAM) due to high sedimentation rates …
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Differently from the removal efficiency of water turbidity after sedimentation, ... size and reversibility (after breakage) upon the charge type of polymeric flocculant aid. They suggested that cationic polyacrylamides (PAM) produced floc aggregates with ... kaolin (Al 2 Si 2 O 5 (OH) 4 /H 2 Al 2 Si 2 O 8 ·H 2 O; chemical grade; formula weight ...
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ABSTRACT Suspensions of negatively charged kaolin clay as a model system have been flocculated by adsorbing nonionic, cationic, and anionic polyelectrolytes under shear. Test results show that the maximum rate of settling increases with charge density of the cationic polymer being used. Both cylinder test and jar test using low shear conditions tend to …
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The six different polyacrylamides used as flocculants in this study were provided by Cytec Industries Inc., Bradford, UK. ... The effect of polyacrylamide charge density and molecular weight on the flocculation and sedimentation behaviour of kaolinite dispersions. Sep. Purif. ... Kaolin based suspensions have wide range of applications …
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Standard kaolin suspensions were flocculated using cationic polyacrylamides of similar high molar mass (2.6–2.7×106 g mol−1) but different charge densities (78–221 C g−1).
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Particle interactions, and in turn fabric, determine the behavior of clay mineral particle systems. Polymers with deliberately chosen characteristics, such as molecular mass and ionic type, can be utilized to manipulate clay fabric. The purpose of this study is to understand fabric development in a clay-polymer system, specifically kaolin …
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On the other hand, non-ionic polyacrylamide flocculant, which is predominantly chemisorbed on kaolin and exhibits a more stretched conformation, is most suitable for enhancing sedimentation rate.
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Flocculation, as a result of the interaction between non-ionic polyacrylamide polymer (PAM-N) and kaolin surface in aqueous suspension, has been discussed both in the absence …
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By comparing the sedimentation rate results obtained at natural pH and pH 3.5, it can be seen the sedimentation rate of flocs formed at pH 3.5 by 920 SH and 912 SH was …
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Semantic Scholar extracted view of "The effect of colloid concentration and pH on kaolin suspensions flocculated with cationic polyacrylamides of high molar mass" by R. Gill et al. ... The impact of desilication products on the flocculation and sedimentation properties of bauxite residue. A. Senaputra. Environmental Science, Materials Science ...
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The effect of high molecular weight polyacrylamide (PAAM; 5×106) and hydroquinone (HQ) on the sedimentation rate of kaolin suspensions was investigated by sedimentation, …
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Polyacrylamides (PAMs) have been used as soil stabilizers or flocculants to counteract soil erosion and colloid Ws). ... respectively. Sigma kaolin (Sigma-Aldrich, St. Louis, MO, USA) was used in the adsorption tests, and Kaofil kaolinite (Thiele Kaolin Company, Sandersville, GA, USA) was purchased in bulk for the flocculation …
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The effectiveness of kaolin flocculation by PAM-C in absence and presence of surfactants measured in terms of settling rate and sediment volume are presented in Fig. 1, Fig. 2.The unflocculated kaolin exhibits extremely slow settling rate of 0.03 cm/s and sediment volume of 1.92 cm 3 /g of kaolin. The settling rate increases rapidly with …
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development in a clay-polymer system, specifically kaolin-polyacrylamide systems over a wide. range of solids content. Methodologies include sedimentation tests (low solids …
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Download Table | Characteristics of polymers used for the sedimentation experiments from publication: Comparative Study of Branched and Linear Polymers for the Regulation of Clay Dispersion ...
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The flocculation of kaolin suspended in a dilute salt solution was studied as a function of the addition of cationic surfactant and cationic polyacrylamide (CPAM) added separately, consecutively, or simultaneously. Cationic polyacrylamide caused flocculation by bridging when added in low concentrations, but at higher concentrations, charge neutralization …
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The kaolin was converted to a monoionic sodium kaolin using a conversion method modified after van Olphen (1977). The method consists of mixing the kaolin in a 2 M NaCl solution for 48 h and a 1 M NaCl solution twice for 24 h each time. After the. Sedimentation tests
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The kaolin used in this study was an untreated kaolin from Wilkinson Kaolin Associates LLC (Gordon, Georgia). The chemical composition (Table 1) is approximately that of pure kaolinite as defined by Murray (1991) with a small content of impurities.The kaolin was converted to a monoionic sodium kaolin using a conversion method …
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The effects of the surface charge and molecular weight of anionic and cationic polyacrylamide (PAM) on the surface chemistry, settling rates, floc sizes and sediment bed compactness of kaolinite suspensions has been investigated at pH 7. At optimum polymer concentrations, the kaolinite floc sizes were larger and the settling …
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Sedimentation tests (low solids content, zero strain condition), viscosity measurements (intermediate solids content, high strain condition), and liquid limit measurements (high …
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