Grinding mills are very important in mining industry. Through the mills, we can get proper and wanted kinds of powders. Of course, if you’d like to make the final products more accurate, the effective diameter of a grinding mill is the key.

The effective diameter of a grinding mill is the diameter inside lining; i.e., the net diameter. In this case, the mill under consideration is a new installation so liners will be roughly 3” thick and the net diameter will be 6” less than the diameter inside the shell. Since no diameter has been specified, investigate a range to find the most suitable. From the table the values of A are:

For a net diameter of 10’6” (3200mm) ………………………………. A = 63.5

For a net diameter of 11’6” (3205mm) ………………………………. A = 79.3

For a net diameter of 12’6” (3810mm) ………………………………. A = 97.5

For a net diameter of 13’6” (4114mm) ………………………………. A = 118.5

Step 3: Most overflow discharge mills operate with 35 to 45 percent charge. An average value is 40%. The value of B from the table for a wet overflow mill at 40% is as follows: b = 5.02

Step 4: Speed was not specified, so a range of speeds should be investigated to find the most suitable. From the table the values of C are as follows:

For 68% of critical speed ……….. C = 0.1583

For 72% of critical speed ……….. C = 0.1724

For 76% of critical speed ……….. C = 0.1878

Step 5: Solving for the length of the mill with 02’6” net diameter, 40% charge and 68% of critical speed required to draw 1400 HP:

L = 1400 = 27.7 ft.

63.5 x 5.02 x .1583

There are Raymond mill, verticle mill, overflow ball mill, rod mill etc.

 

Raymond mill: http://www.crusher-machine.com/13.html
ball mill: http://www.crusher-machine.com/21.html

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Sand making machine: http://www.hxjq-crusher.com/58.html
Stone production line: http://www.hxjqchina.com/n26.html

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