| Grinder (milling) |
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BALL MILLING A typical type of fine grinder is the Ball Mill . A slightly inclined or horizontal rotating cylinder is partially filled with Ball s, usually Stone or Steel , which grinds material to the necessary fineness by Friction and impact with the tumbling balls. The feed is at one end of the cylinder and the discharge is at the other. Ball mills are commonly used in the manufacture of Portland Cement . ROD MILLING A rotating drum causes friction and attrition between steel Rods and ore particles. hihi:P SAG MILLING A rotating drum throws large rocks and steel balls in a cataracting motion which causes impact breakage of larger rocks and compressive grinding of finer particles. Attrition in the charge causes grinding of finer particles. SAG is an acronym for Semi Autogenous Grinding, and applies to mills that utilze steel balls in addition to large rocks for grinding. AUTOGENOUS MILLING A rotating drum throws large rocks in a cataracting motion which causes impact breakage of larger rocks and compressive grinding of finer particles. Attrition in the charge causes grinding of finer particles. Also known as ROM or "Run Of Mine" grinding. PEBBLE MILLING A rotating drum causes friction and attrition between rock Pebble s and ore particles. May be used where product contamination by Iron from Steel balls must be avoided. HIGH PRESSURE GRINDING ROLLS The ore is fed between two rollers which are pushed firmly together while their rotating motion pushes the ore through a small gap between them. Exteme Pressure causes the rocks to Fracture into finer particles and also causes microfracturing at the grain size level. It consists of a pair of horizontal cylindrical rollers through which material is passed. The two rollers rotate in opposite directions, "nipping" and crushing material between them. A similar type of intermediate crusher is the edge runner, which consists of a circular pan with two or more heavy Wheel s known as mullers rotating within it; material to be crushed is shoved underneath the wheels using attached Plow blades. EXTERNAL LINK Hammermills and Pulverizers |
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