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The series of products is a kind of high efficiency screw-type sand- washing equipment developed in combination with the reality of gravel industry in China for the use of sand-making machine, mainly for equipment of impurity of sand products(such as dust). The equipment has the functions of washing, dewatering and classifying. It is applicable to sand required for construction sites, gravel, concrete dam of hydropower stations, post poles factory and ‘ seven 0 ‘ sand for casting. Quartz sand for glass factory, washing, dewatering and classifying of the pressure sand for backfill of oil well, suitable for washing operation of fine-grained and coarse-grained material, especially for sand of building construction and gravel for road construction.