Gravel is rock that is of a specific particle size range. Multiple kinds of gravel happen to be recognized, including: Bank gravel, Bench gravel, Creek rock, Crushed rock, Crushed stone, Fine gravel, Lag gravel, Pay gravel, Pay gravel, Piedmont gravel, Plateau gravel, River run gravel. Gravel is an important commercial product, with a number of applications. Many roadways are surfaced with gravel, especially in rural areas where there is little traffic. Both sand and small gravel are also important for the manufacture of concrete.
In dry grinding processing systems, the mineral aggregate material from conventional crushing and screening operations is subject to coarse and fine grinding primarily in roller mills and/or ball mills to reduce the material to the necessary product size range. A classifier is used to size the ground material and return oversized material that can be pulverized using either wet or dry processes. The classifier can either be associated with the grinding operation, or it can be a standalone process unit. Fabric filters control particulate matter emissions from the grinding operation and the classifier. The products are stored in silos and are shipped by truck or in bags.
In wet grinding processing systems, the mineral aggregate material is processed in wet mode coarse and fine grinding operations. Beneficiation processes use flotation to separate mineral impurities. Finely ground material is concentrated and flash dried. Fabric filters are used to control particulate matter emissions from the flash dryer. The product is then stored in silos, bagged, and shipped.
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