Cement clinker is usually ground using a cement ball mill. This is essentially a large rotating drum containing grinding media - normally steel balls. As the drum rotates, the motion of the balls crushes the clinker. The drum rotates approximately once every couple of seconds.
Grinding systems are either 'open circuit' or 'closed circuit'. In an open circuit system, the feed rate of incoming clinker is adjusted to achieve the desired fineness of the product. In a closed circuit system, coarse particles are separated from the finer product and returned for further grinding.
This cement ball mill is mainly used in grinding cement finished products and raw materials and also suited to metallurgical, chemical, electricity etc. and other industrial mining enterprises. It could also be used to grind various ore materials and materials that is grindability.
Cement mill is a simplified level, out of the hollow shaft and grinding materials and other components, simplified for the long cylinder, cylinder equipped with a grinding, cylinder of steel plate, with steel liner and simplified fixed, grinding media generally steel ball, according to different tube diameters and a certain percentage of load in, section steel grinding media can also be used.
When the cylinder rotates, the material and the ball under the action of centrifugal force, close to the liner, due to the role of friction, the material and the ball into the cylinder a certain height, the gravity, the ball and materials while whereabouts of the ball crushing the material, while the relative liner material sliding friction occurs, the resulting abrasive material, grinding the material so as to achieve the purpose.
Material by the feeding device into the compound air evenly into the mill screw shaft first warehouse, the warehouse there are ladder liner or corrugated liner, built with different specifications steel ball, rotating cylinder produces centrifugal force to the ball a certain height After the fall, have severe impact on the material and abrasive. Coarse material in the first position to reach, after single-compartment plate into the second warehouse, the warehouse lined with flat lining, there are balls, the material to further grinding. Powder discharged through the discharge grate plate, complete the grinding operation.
Cylinder in the rotary process, the grinding phenomenon has slipped in the fall to the process of abrasive material in order to effectively use abrasive effect on the larger particle size is generally twenty head when finely ground, the body tube mill body with the diaphragm plate separated Sec, it becomes two-position, materials into the first position when the ball was crushed, the material into the second position when the end of the material for grinding steel, finely ground material passing from the discharge end of the discharge hollow shaft, the small particles of feed material for pulverized, as in II slag sand, coarse fly ash, mill shell could have no partitions, a single-chamber tube mill, grinding the volume of steel can also be segment.
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