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FLSmidth USA, Inc. <br /> 7158 S FLSmidth Drive • Midvale • UT 84047-5559 • USA M , DT H <br /> Feed Input <br /> Cylinder -- <br /> C. <br /> Ccrtrcller <br /> FI: <br /> Feet <br /> F�riF Punt <br /> Flc�c_I=_rh <br /> MEN <br /> iF <br /> t <br /> Figure 1: FLSmidth Testing Setup - Continuous Fill Test <br /> 3.5 Mud Rheology <br /> Thickened underflow from the continuous fill test allows for the determination of underflow <br /> rheology necessary for proper underflow management and rake motor selection. Process <br /> liquor is used to dilute the thickened underflow sample through a series of solids <br /> concentrations to measure yield stress as a function of solids concentration. <br /> Underflow samples from the Dynamic tests were retained for rheological analysis. Mud <br /> rheology can be the limiting factor in the solids concentration that is discharged from a <br /> Paste thickener. Mud rheology data was obtained on the slurry samples over a range of <br /> solids densities/solids concentration using a Haake VT550 Vane Viscometer and a <br /> specialized "DOE 25x25 vane", which can be seen in Figure 2. The slurry yield stress, the <br /> force required to produce movement from a stationery bed is measured and correlated with <br /> underflow solids concentration. This yield stress is a function of solids content (the slurry is <br /> thus thickened to a range of solids concentration), polymer type, polymer dosage, particle <br /> size and the mineralogy of the particles. <br /> Page 1 7 <br />