Effect of clay-stickie interaction on centrifugal cleaner efficiency.Application: This study shows that clay and stickies can form neutral-buoyancy agglomerates that cannot be removed by centrifugal cleaners. ********** Small clay particles can agglomerate agglomerate Large, coarse, angular rock fragments associated with lava flow that are ejected during explosive volcanic eruptions. Although they may appear to resemble sedimentary conglomerates, agglomerates are igneous rocks that consist almost wholly of angular or rounded with polyvinyl acetate Noun 1. polyvinyl acetate - a vinyl polymer used especially in paints or adhesives PVA polyvinyl resin, vinyl polymer, vinyl resin - a thermoplastic derived by polymerization from compounds containing the vinyl group (PVAc) to form neutral-buoyancy aggregates. When clay is added to water and centrifuged, a measurable amount of total suspended particles (TSS See ITU. ) is obtained. No significant change in TSS occurs when we add PVAc to the mixture at 45[degrees]C before centrifugation Centrifugation A mechanical method of separating immiscible liquids or solids from liquids by the application of centrifugal force. This force can be very great, and separations which proceed slowly by gravity can be speeded up enormously in centrifugal . Both components are heavier than water at this temperature, and any aggregation does not significantly change the number of suspended particles. However, centrifuging the clay-PVAc mixture at 60[degrees]C increases TSS, because the PVAc floats at this temperature, and aggregation of the now lighter PVAc with the heavier clay increases the quantity of neutral-buoyancy particles. The formation of aggregates is confirmed by electron microscopy electron microscopy Technique that allows examination of samples too small to be seen with a light microscope. Electron beams have much smaller wavelengths than visible light and hence higher resolving power. and by particle size measurements. These aggregates will be transparent to centrifugal cleaners. Furthermore, stickies spread on the surface of the particles, thus increasing the surface area. Hence, clay will increase the effective concentration of the stickie and decrease cleaning efficiency. S! Yang and Banerjee are with the Institute of Paper Science and Technology, 500 10th Street, NW, Atlanta, GA 30318; email Yang at ji.yang@ipst.edu or Banerjee at s.banerjee@ipst.edu. |
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