A Total Apparent Volumetric Charge Filling – including balls and excess slurry on top of the ball charge, plus the interstitial voids in between the balls – expressed as a percentage of the net internal mill volume inside liners . B Overflow Discharge Mills operating at low ball fillings – slurry may accumulate on top of the ball charge; causing, the Total Charge Filling Level to
The design results show that the minimum shaft power required to drive the ball mill is 0.2025 horsepower, the length of the mill at a fixed mill diameter of 210 mm is 373 mm, and the required shaft length and diameter are 712.2 mm and 30 mm respectively.
The length of the mill is approximately equal to its diameter. The general idea behind the ball mill is an ancient one, but it was not until the industrial revolution and the invention of steam power that an effective ball milling machine could be built. It is reported to have been used for grinding flint for pottery in 1870.
Ball Mill Design A survey of Australian processing plants revealed a maximum ball mill diameter of 5.24 meters and length of 8.84 meters Morrell, 1996 . Autogenous mills range up to 12 meters in diameter.
Cement Ball Mill Sizing Explanation - The Cement Grinding Office This method only gives a rough and initial idea for sizing a cement ball mill. To go ahead, a . Multiply this L/D ratio by the diameter to find the useful mill length. Get Price
Ball mill design calculation pdf. AMIT 135 Lesson 7 Ball Mills amp Circuits Mining . Ball Mill Design. A survey of Australian processing plants revealed a maximum ball mill diameter of 5.24 meters and length of 8.84 meters Morrell, 1996. Autogenous mills range
The variation of a with ball diameter was found to be of the form a = k2/d1.5. Both k1 and k2 vary with mill diameter, and simple power laws have been assumed, k1 ∝ D0.1, k2 ∝ D0.6. If it is
The program gives as output the calculated mill length, mill diameter, mill speed, ball load, hydrocyclone number and the size distribution in all of the circuit streams. As an example: Select a mill to grind 425 tph of copper ore from a feed size of 80% passing 2360/ m to a product of 80% passing 210 ttm.
Ball mills normally operate with an approximate ball charge of 30%. Ball mills are characterized by their smaller comparatively diameter and longer length, and often have a length 1.5 to 2.5 times the diameter. The feed is at one end of the cylinder and the
In Grinding, selecting calculate the correct or optimum ball size that allows for the best and optimum/ideal or target grind size to be achieved by your ball mill is an important thing for a Mineral Processing Engineer AKA Metallurgist to do. Often, the ball used in ball mills is oversize “just in case”. Well, this safety factor can cost you much in recovery and/or mill liner wear and