Abstract
Rheological properties of aqueous suspensions of magnetite, varying in particle size distribution and solids content have been studied. Three models, the Bingham, the Herschel-Bulkley, and the Casson were found to describe the experimental flow curves quite well. The Casson model turned out to be very effective in describing the flow curves in a broad range of magnetite particle sizes (from d 63.2 = 30 μm resembling commercial magnetite down to a micronized magnetite with d 63.2 =2.7 μm), and over the solid content range from 5% to 25% by volume. The two rheological parameters obtained from the experimental data using the Casson model, the Casson yield stress and the Casson viscosity were evaluated, and it was concluded that while the Casson viscosity was nearly constant over the magnetite medium density range of 1.3 to 1.7 (5% to 20% by volume), the Casson yield stress varied in a predictable way with magnetite particle size and solids content.
Published Version
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