905 Table 3 dewatering screen pilot results The screen discharge was at 80% solids however this could be increased to more than 85% with longer residence or gravity draining. Gravity draining tests resulted in 5% moisture after 2 ½ hours and 0.1% after 5 hours. Product Solids t/h -75um % -20um % Drainage tests (min) Solids % Cyclone sands 31.9 6.6 2.0 60min 68.5 Metso screen discharge 28.8 3.3 0.8 20min 80 Cyclone sands 31.2 7.7 2.4 50min 68.5 Metso screen discharge 28.1 3.4 0.8 15min 80 Table 4 dewatering screen pilot results Figure 8: Variation of passing below 75 µm and 20 µm between Current Sands vs Clean sands Pilot Plant – Campaign N°1
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