This series of sand mills are widely used in high-efficiency wet ultra-fine grinding and dispersion processing of non-metallic minerals such as coatings, dyes, paints, inks, pharmaceuticals, toners, ferrites, photographic films, pesticides, paper and cosmetics. It combines the advantages of domestic and foreign models, has the advantages of high efficiency, strong work continuity, less pollution, reliable control, and has the advantages of cost, compact structure, generous shape, small floor space, convenient use and maintenance, etc. applicability. This series of models adopts a full-bath lubrication mechanical seal, which can use the same diluent as the cooling lubricant, and has no pollution to the product materials.