
Excellence at Lehigh Hanson's Bristol sand and gravel plant
2/5/2016 · At the processing plant, the material is fed through a fourdeck screen. Gravel is sent to a rock plant with a log washer and a doubledeck screen for processing. Anything an inch and a half or larger is sent to a waste pile. The sand goes through a classifier and a set of twin screws. Yet another screw is used for producing cushion sand.