Aggregates Manager Digital Magazine
Issue link: http://read.dmtmag.com/i/120734
Maintaining Fine Material Screw Washers Follow these operating and maintenance recommendations to keep your fine material screw washer operating efficiently. by Dave Schellberg and Rick Madara 28 M any aggregate plants throughout North America use fine material screw washers for dewatering slurries of minus 1/4-inch x 0 fines in the production of varying specifications of sand. The feed to a fine material screw washer could be dry screened minus 1/4inch material or it could be a slurry directly from a wet vibrating screen, a sand classifying tank, a hydrosizer, AGGREGATES MANAGER April 2013 or other wet processing system that is able to control the top size of the material and classify the sand to the desired grading. Making sure that a fine material screw washer is operating efficiently and retaining the product gradation required can be simply evaluated by checking the following items: • Make sure the weirs that allow the overflow of water