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Water Structure Changes within High Solids Loading Calcium Carbonate Slurries
Joshua J. Taylor, Yi-Chung Wang, Wolfgang M. Sigmund
Department of Materials Science and Engineering, University of Florida, Gainesville, FL 32611
received March 9, 2010, received in revised form May 24, 2010, accepted May 25, 2010
Vol. 1, No. 1, Pages 7-14 DOI: 10.4416/JCST2010-00003
Abstract
Slurries with up to 75 ms% calcite were investigated with attenuated total reflectance – Fourier transform infrared spectroscopy (ATR-FTIR). It was found that infrared absorption bands for water and deuterated water in slurries strongly depend on the solids loading. As the solids loading increases there is a decrease in structured water. Aging of the slurry reverses the trend and increases the amount of structured water. These measurements indicate that results obtained in dilute conditions as required by many scientific characterization techniques may not be extrapolated to high solids loading slurries for calcium carbonate. Furthermore, these results provide the first explanation for unexplained increases in viscosity of aging slurries at high solids loading.
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Keywords
calcium carbonate, slurry, water structure, adsorption, dispersion, sodium polyacrylate, ATR-FTIR, deuterium, oxide, solids, loading, ground
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© 2010 Göller Verlag
Acknowledgments
This research was supported by an Alumni fellowship of the University of Florida and the dispersion consortium at the Particle Engineering Research Center, including the companies Kemira Chemicals, Inc. and Imerys Clays, Inc.
