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Loading...Importance of Ball mill
Ball mill is generally used to grind material 1/4 inch and finer, down to the particle size of 20 to 75 microns. To achieve a reasonable efficiency with ball mill, Ball mill must be operated in a closed system, with oversize ball mill material continuously being recalculated back into the ball mill to be reduced. Various classifiers, such as screens, spiral classifiers, cyclones and air classifiers are used for classifying the discharge from ball mill. Ball mill is an efficient tool for grinding many materials into fine powder. The ball mill is used to grind many kinds of mine and other materials, or to select the mine. It is widely used in building material, chemical industry, etc. There are two ways of ball mill: the dry process ball mill and the wet process ball mill. Ball mill can be divided into tabular type and flowing type according to different forms of discharging material.
Output of ball mill
Output of ball mill is related to ball load and ball diameter. One ball mill ball should keep relatively proportion with another ball. General size of the ball mill tube diameter ranges from 25mm to 60mm. If the ball mill cylinder body is full of large diameter balls, this is good for crushing large ball mill material. But the ball mill gap between the balls is large, and the relatively surface area is small, ball mill have disadvantages to fine grinding. However, the output of the coal ball mill is negative because of too many balls and small impact force. At the same time, because of the relatively larger surface area of the ball, the ball will increase energy consumption.
Cement Mill and Grind Materials
The cement mill materials are transferred to the grinding chamber through the quill shaft uniformly. There are ladder cement mill liners and ripple liner and different specifications of cement mill steel balls in the chamber. The cement mill centrifugal force caused by rotation of barrel brings the cement mill steel balls to a certain height and impact and cement mill the materials. The ground materials are discharged through the cement mill discharging board thus the cement mill process is finished. Cement mill grind material by rotating a cylinder with steel grinding balls, causing the cement mill balls to fall back into the cylinder and onto the cement mill material to be ground. The rotation is usually between 4 to 20 revolutions per minute, depending upon the diameter of the cement mill. The larger the cement mill diameter, the slower the rotation. If the peripheral speed of the cement mill is too great, it begins act like a centrifuge and the cement mill balls do not fall back, but stay on the perimeter of the cement mill. The point where the cement mill becomes a centrifuge is called the ‘Critical Speed’, and cement mill usually operate at 65% to 75% of the critical speed.
