903 Results Pilot Plant Figure 4 pilot plant results Results from the trial (Table 1) indicated over 90% recovery of material fed to the screen with a 65% reduction in slimes. Results of the water permeability tests, gave an improvement in the time of 60minute transit in the flow of existing sands to 20 minutes in the flow of clean sands. These results indicate the increasing in three times the permeability of sands. Table 1: Water transit time in different campaigns Campaign Before min After min Permeability Ratio Test N°1 60 20 3.1 Test N°2 50 15 3.3 Test N°3 86 20 4.3 0 10 20 30 40 50 60 70 80 90 100 10 100 1000 % Passing Cumulative Particle Size, microns PSD in different stages of Process UF Cyclowash Feed DWScreen Oversize Undersize
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