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Sand particles range in diameter from 0.***5 mm to 2 mm. An individual particle in this range size is termed a sand grain. Sand grains are between gravel (with particles ranging from 2 mm up to *4 mm) and silt (particles smaller than 0.***5 mm down to 0.**4 mm). 
we can reach up to *5 micron milled sand with magnetic separation
uses
• Beach nourishment: Governments move sand to beaches where tides, storms or deliberate changes to the shoreline erode the original sand. 
• Brick: Manufacturing plants add sand to a mixture of clay and other materials for manufacturing bricks. 
• Cob: Coarse sand makes up as much as *5% of cob. 
• Mortar: Sand is mixed with cement and sometimes lime to be used in masonry construction. 
• Concrete: Sand is often a principal component of this critical construction material. 
• Glass: Sand is the principal component in common glass. 
• Landscaping: Sand makes small hills and slopes (for example, in golf courses). 
• Glaze, frit, ceramic, instead of quartz 
• Paint: Mixing sand with paint produces a textured finish for walls and ceilings or non-slip floor surfaces. 
• Railroads: Train operators use sand to improve the traction of wheels on the rails. 
• Roads: Sand improves traction (and thus traffic safety) in icy or snowy conditions. 
• Sand animation: Performance artists draw images in sand. Makers of animated films use the same term to describe their use of sand on frontlit or backlit glass. 
• Sand casting: Casters moisten or oil molding sand, also known as foundry sand and then shape it into molds into which they pour molten material.