Figure 6 Permeability current Figure 7 Clean sands with Dewatering screen Campaign Product Sólids, TMS/h Mass Recovery % - 75 um, % - 20 um, % t/h -75 um % Fines -75 um t/h -20 um % Ultrafines -20 um Test N°1 Current sands 31.9 100 6.57 2.00 2.10 100.00 0.64 100.00 Clean sands with Screen 28.8 90.3 3.33 0.76 0.96 45.76 0.22 34.31 % Elimination 54.24 65.69 Table 2 dewatering screen #1 trial results Campaign Product Sólids, TMS/h Mass Recovery % - 75 um, % - 20 um, % t/h -75 um % Fines -75 um t/h -20 um % Ultrafines -20 um Test N°1 Current sands 31.2 100 7.72 2.36 2.41 100.00 0.74 100.00 Clean sands with Screen 28.1 90.1 3.44 0.82 0.97 40.13 0.23 31.29 % Elimination 59.87 68.71 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.
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