(120b) Structural Characterisation, Growth Kinetics and Sedimentation Dynamics of Polymer-Mg/Al Hydroxide Flocculant Systems in the Nuclear Industry
World Congress on Particle Technology
Wednesday, April 25, 2018 - 3:56pm to 4:17pm
Polymer driven flocculation has been a method applied by industries including composite materials synthesis, paper manufacturing, and water treatment. The colloidal complexes in these wet storage facilities are known to be polydisperse pseudo-hexagonal platelets and particle-polymer floc structure assembly dynamics is non trivial. The role of polymer conformation time to particle surfaces has been discussed in great amounts of literature and is considered consensus in determining the structure of these macro-aggregate polymer-particulate systems.
Magnesium and aluminium hydroxide bulk density was analysed using hindered settling test correlations to determine the sedimentation dynamics of these materials without addition of settling aids. The surface properties of these materials including morphology, surface charge and area were investigated using Scanning Electron Microscopy (SEM), Electrophoresis and BET isotherm techniques respectively. The self-coagulation dynamics and structure of these particles was also investigated using sonification coupled with Static Light Scattering (SLS) to achieve a Particle Size Distribution (PSD) and 3-dimensionsional fractal dimension of these self-coagulating aggregates.
The effect of polyacrylamide-polyacrylic acid co-polymers on the flocculation dynamics was investigated regarding the particle-polymer floc growth kinetics in varying shear conditions using Focused Beam Reflectance Measurement (FBRM). The influence of polymer to particle ratio and polymer charge density on the structure was acquired via 3-dimensional fractal dimensions using SLS and a PSD was obtained using a combination of SLS and FBRM. Characterisation of the floc configuration preference to bridging or electrostatic patch regimes were qualitatively determined using a flowing microscope instrument (FLOCAM). Overall impact on these resultant flocs structures on their sedimentation dynamics was compared through traditional settling tests and optimum dose and polymer charge density for such systems was determined.
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