the sand washing machine is cleaning equipment for artificial sand and natural sand, which capable of selection, classification, dust-removal, washing, and widely used in the sand quarrying, mining, construction materials, water conservancy, hydropower, concrete and so on applications. there are two types of sand washing machines wheel type and spiral type.,what is sand mining,dec 23, 2016 what is sand mining ? posted 2016-12-23. sand mining is a practice that is used to extract sand, mainly through an open pit. however, sand is also mined from beaches, inland dunes and dredged from ocean beds and river beds. it is often used in manufacturing as an abrasive, for example, and it is used to make concrete.