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Example (8): A slurry containing 50 percent of the mass of solid materials with a density of 2,600 kg / m is filtered on a rotary cylinder filter, with a diameter of 2.25 m and a length of 2.5 m, which works with immersion of 35% of its surface in the slurry and under vacuum 600 mm Hg. A laboratory test on a slurry sample, using a 100 cm² paper filter and covered with a cloth identical to that used on a cylinder, produced 220 cm of filtration in the first minute and 120 cm of filter the next day a minute when the paper was under a vacuum of 550 mm Hg. The apparent density of the moist cake was 1600 kg / m and the filter density was 1000 kg / m3. Assuming the cake was not compressible and left 5 mm of cake on the cylinder, determine the theoretical maximum flow rate of the filter that could be obtained. What is the speed of the cylinder that will give the filter rate 80% of the maximum?