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It is desired to separate a mixture of sugar crystals into two fractions, a coarse fraction retained on an 8 mesh screen and a fine fraction passing through it. screen analysis of feed, coarse and fine fraction shows; mass fraction of 8 particles in feed = 0.46 Mass fraction of +8 particles in coarse fraction = 0.88 Mass fraction of +8 particles in fine fraction = 0.32 Calculate the masses of the coarse and fine fractions per 100 kg of feed. What is the overall effectiveness of the screen used for the separation purpose? Solution: Let F = amount of feed, kg V -=amount of course product, kg L = amount of fine product, kg XF, XV, XL – mass fractions of +8 particles in feed, coarse, and fine fractions.