Wet Milling has several advantages including easy discharging. Simply rotate the mill with the discharge grate point down and open the valve.
Dry Milling has advantages including reduce reactivity and ease of handling the dry solids. With a few design changes, dry discharging is simple and contained. The main design change is the addition of a full or partial housing to contain the solids as they are discharged from the mill while rotating. Dry discharging is fast – usually 5-15 minutes. Small mills utilize a full housing with a hopper or collection drawer. Medium to large mills utilize narrow discharge housing just wide enough to enclose the one or more discharge grates.