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- W2247295419 abstract "In this study, the effect of polymeric flocculant structure on interfacial chemistry and particle interactions of iron oxide dispersions has been investigated using four high molecular weight polyacrylamides (two anionic, one non-ionic and one cationic) as a function of pH. Both the interfacial chemistry (quantified through zeta potential measurements) and particle interactions (as determined by rheology) play a pivotal role in the dewaterability of iron oxide pulps. Polymer adsorption density decreased with increasing pH (from 6 to 11), of which the non-ionic and cationic polymers had the highest adsorption affinity. The adsorption isotherms followed the Freundlich (rather than Langmuir) model for adsorption, consistent with the observation that the amount of polymer adsorbed increased monotonically with increasing polymer concentration up to 7500 g/t solid. The charged polymers adsorbed via chemical, hydrogen, and electrostatic bonding and displayed a more expanded interfacial conformation than the non-ionic polymer, which mainly adsorbed via hydrogen bonding. The zeta potential of the unflocculated particles was +40, 0, -40 mV at pH 6, 8.5 (the isoelectric point, iep) and 11, respectively. Flocculation with anionic polymers altered the zeta potential by up to 45 mV at 50-500 g polymer/t solid, whilst the non-ionic and cationic polymer addition had no significant effect at or below the iep. The flocculant type and pH had a substantial effect on the particle interactions, with the charged particles' pulps exhibiting higher yield stresses upon flocculation. The pulps flocculated with the sulfonate substituted anionic polymer and the cationic polymer displayed much higher yield stresses in comparison to the pulps flocculated with the anionic (carboxylate substituted) and non-ionic flocculants." @default.
- W2247295419 created "2016-06-24" @default.
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- W2247295419 date "2006-01-01" @default.
- W2247295419 modified "2023-09-28" @default.
- W2247295419 title "The Impact of Polymeric Flocculant Structure and Adsorption Behaviour on the Interfacial Chemistry and Rheology of Colloidal Iron Oxide Dispersions" @default.
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