Ball Mill Ball Charge

The loading or change volume can then be read off the graph below or. The type of mill also is a factor as if it is an overflow mill subject to the diameter of the discharge port is usually up to about 40 45. Dropped charge also known as frozen or locked charge occurs when solidified material inside a horizontal grinding mill does not cascade when the mill starts rotating at start up.

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If it is a grate discharge you will have more flexibility of the total charge.

Ball mill ball charge. Overcharging results in poor grinding and losses due to abrasion of rods and liners. So as a rule of thumb we use 25 solid loading. The length of the cylindrical shell is usually 1 1 5 times the shell diameter figure 8 11 the feed can be dry with less than 3 moisture to minimize ball coating or slurry containing 20 40 water by weight. While the mill is stopped the charge volume can be gotten by measuring the diameter inside the liners and the distance from the top of the charge to the top of the mill.

The internal machinery of ball mill grinds the raw material into the powder like material and if extreme fineness and refinery are required then rotation go on continue. Ball top size bond formula. The ball charge of a sag mill is about 29 to 30. You should see some discernible layer of product on top of the media.

The size of feed particles to a rod mill is coarser than for a ball mill. Dropped charges experienced in large ball mills can be heard and felt hundreds of meters away and can be confused with an explosion or earthquake on. Add to this another 10 15 above the ball charge for total of 23 to 25 product loading. By friction and influence of tumbling balls inside rotating cylinder grinds the raw material to the required fineness.

Once the mill has been loaded and run for a few minutes open the cover and look down into the mill. The height or depth of charge is measured in the same manner as for ball mill. We can calculate the steel charge volume of a ball or rod mill and express it as the of the volume within the liners that is filled with grinding media. The usual feed size ranges from 6 to 25 mm.

Calculation of the top size grinding media balls or cylpebs modification of the ball charge. The ball charge and ore charge volume is a variable subject to what is the target for that operation. Instead it is lifted and then free falls onto the mill shell. The ball mill is a tumbling mill that uses steel balls as the grinding media.

Undercharging also promotes more abrasion of the rods. This calculator analyses the granulometry of the material inside the mill and proposes a modification of the ball charge in order to improve the mill efficiency.