accuracy of feeders
As I understand your product is a fine powder, oderwise you would not be considering aereation.
Check your special device feeder. and see if it really gives you the accuracy you were told.
As it was mentioned before, the special device could not be up to expectations or its calibration might have degraded.
If the screw feeder is not accumulating any material inside, it should not change the feeder responce , unless it is pumping air with the solids and affecting the feeder calibration. Highly unlikely unless you are running it at high speed or forming pluggs, normally your screw should run less than half full. I suppose you are not runiing a gas tight connection between the screw and the dosifying device.
Sponge Iron (DRI) handling
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