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Dust Collection & Pollution Control Q&A

  •   I have a fine aggregrate (20/40 mesh) stored in supersacks. The plastic liner in the sacks has degraded from UV. I need to clean up the aggregate by removing the plastic particles. There is a large difference in density between the two. Do not want to expose aggregate to more than 10-15 psi. Will gravity cyclone with vacuum dust removal work?

    Answered July 21st, 2010 by Expert: Rob Williamson

    Before the selection of a separation \ classification method, a particle size, bulk density and composition analysis will need to be completed on a material sample. If this data is available, then a calculation of the efficiency on the particle size ranges and densities will determine the type and design of the correct separation device. The next step is to perform a cost \ benefit analysis on the equipment investment versus the savings in product recovery.

    An alternative approach is to send a dust sample to OEMs of classifier and APC equipment for testing. Many of these OEMs have labs with the ability to simulate the process and try different technologies and system parameters to find the best solution. The existing plan to use a standard centrifugal separator and manual vacuum could have issues because of the particle agglomeration in the cyclone and high material to air density due to the loading method.

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