The Effect of Polyacrylamide on Floc Structure
The Effect of Polyacrylamide on Floc Structure of Typical Systems Article (PDF Available) in Applied Mechanics and Materials 260-261:887-890 · December 2012 with 11 Reads How we measure 'reads'
Effect of polymerization method on structure and properties of cationic polyacrylamide The results show that the kaolinite floc size and effective floc density are strongly dependent upon copolymer microstructure, with greater floc size and lower effective floc density being observed for copolymer prepared in inverse microemulsion than for
Effect of polyacrylamide polymers on floc size
Effect of polyacrylamide polymers on floc size and rheological behaviour of kaolinite suspensions. Author links open overlay panel M.S. Nasser A.E. James. The effect of the surface charge on floc size can be explained in terms of two parameters, the adsorption and bridging mechanisms
Effect of polyacrylamide polymers on floc size and rheological behaviour of kaolinite suspensions Article in Colloids and Surfaces A Physicochemical and Engineering Aspects 301(1):311-322 · July
The Role of Polymer in Improving Floc Strength for Filtration
The polymer investigated was a slightly anionic polyacrylamide dosed in water collected post dissolved air flotation at concentrations of 0−0.03 mg L−1. With increasing polymer dose, median floc size increased from 228 to 325 μm. Floc responses to increased shear rate showed that polymer dosing increased resistance to floc break-up.
Anionic polymers have a lower adsorption density than cationic polymers. The result is that the zeta potentials of the kaolinite suspensions, flocculated using anionic flocculant, remain negative and this prevents strong adsorption of the polymer. • The floc size and settling rate show a strong dependence on polymer structure type, and
Effect of Polymerization Method on Structure
Effect of Polymerization Method on Structure and Properties of Cationic Polyacrylamide Article in Journal of Applied Polymer Science 110(6):3889-3896 · December 2008 with 54 Reads
The effect of charge density and hydrophobic modification on dextran-based paper strength enhancing polymers; The effect of recycling procedures of papermaking fibres and fines on the adsorption of cationic polyacrylamide; Mechanism of internal sizing by alkyl ketene dimers (AKD): The role of the spreading monolayer precursor and autophobicity
The dispersing action of polysaccharides in oil sand
All the polymers dispersed oil sand slurries by adsorbing on the solid particles and preventing mineral–mineral interactions. The molecular weight of the polymers was a more important factor than the degree of substitution in dispersing the slurries. The role of CMC was also to enhance the liberation of bitumen from solids.
In this work, we present new insights related to a debate on the morphological structure of hydroxyethyl cellulose (HEC) molecules when dissolved in water, i.e., whether HEC adopts a linear-flexible or a rod-like fibrillar configuration. We have employed “seven” rheological techniques to explore the viscoelastic properties of HEC solutions at different time and length scales.
Using a Discrepant Event to Teach the Coagulation
An examination of the National Science Education Standards (National Research Council, 1996) and the Benchmarks for Science Literacy (American Association for the Advancement of Science, 1993) reveals that science teaching is a complex activity.For a teacher to be effective, he or she must have theoretical, as well as practical knowledge and abilities about science.
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- Are flocculants the same as drilling fluids?
- Interestingly, the flocculants applied are the same PHPA polymers used in drilling fluids. Flocculation is readily achieved in mineral processing applications, but residual PHPA concentrations in these slurries are exceedingly low even after dosing; contrast this to drilling fluids, with PHPA concentrations at least five orders of magnitude higher.
- Does encapsulation of cutting particles based on PHPA polymers prevent flocculation?
- Conclusions The effective encapsulation of cutting particles suspended in drilling fluids based on PHPA polymers severely limits (if not prevents) subsequent flocculation by dosing similar anionic flocculants.
- Can a flocculant reduce the concentration of solids suspended in drilling fluid?
- Achieving ∼ 50 % reduction in the concentration of solids suspended in the drilling fluid after centrifugation by pre-dosing with a flocculant was considered a good outcome for applications involving full-face diamond drilling, contributing to better properties of the fluid returned down the borehole.
- How does PHPA affect fluid rheology?
- The introduction of higher molecular weight synthetic polymers typified by partially hydrolysed polyacrylamide (PHPA) allowed the same effect on fluid rheology to be achieved at much lower additive concentrations, a major practical advantage.
