Expert ForumsPowder Handling

Topic: Re: Transporting fine powders

posed by 
I can comment on the material property involved, i.e., permeability. The finer powder has a much lower permeability. If it settles in any place, it will consolidate to a cohesive solid.

The potential solutions include:

be sure that the hopper and line charger are feeding a uniform rate and density*
be sure that the line charger is not leaking air back into the feed hopper
carefully eliminate any locations in the system where the velocity drops below the settlement velocity
minimize the length and eliminate any lines that taper down in elevation
*The finer material may not be suitable for the feed hopper. If the material is forming a rat hole due to an improper hopper shape, periodic flushing can cause a swing in bulk density of up to 30%, which will unbalance the line.