11191 Sand And Gravel Processing
11/95 sand and gravel processing 11.19.1-1 11.19.1 sand and gravel processing 126.96.36.199 process description1-6 ... vibrating screens. rotating trommel screens with water sprays are also used to process and wash wet sand and gravel. screening separates the sand and gravel into different size ranges. water is sprayed onto.