Studies to enhance the FLSmidth forced air machine through changes in the design, showed importantrnimprovements through changes in the number of Rotor blades, stator designs, rotor air distributionrnand other designs features. The main outcomes from this study highlighted that increasing the numberrnof rotor blades increased the selectivity while decreasing power requirements while stators with slotsrnhave better results in terms of recovery, flotation efficiency and selectivity than without slots.rnAlso the rotor air distribution makes a difference in the design when comparing different distributionrncriteria whilst keeping all features of shape and number of blades etc constant. At the most efficientrnrotor air distribution design, copper recovery reached one of the highest values while keeping goodrnselectivity. The possible explanation for that is the increase in the pump capacity indicated by thernincrease in the specific power.rnIt was seen as significant that reduction in specific power for some designs tested compared with thernthen current standard design had an average of 30% less power consumption.rnAs a result, FLSmidth was able to identify new designs that decreased power and improved recovery,rnas well as, identifying some designs that specifically improved fine and/or coarse particle recovery.
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