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Ball mills mineral processing principle apparent difference in capacities between grinding mills listed as being the same size is due to the fact that there is no uniform method of designating the size of a mill for example a 5 x 5 ball mill has a working diameter of 5 inside the liners and has 20 per cent more capacity than all other ball

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Paper 489 LOAD TORQUE ESTIMATION FOR MONITORING BALL MILL FILLING Priscila M Esteves 1 Douglas B Mazzinghy 1 Roberto Galé ry 1 Marcelo M Stopa 2 Braz J C Filho 3 1 Mining Engineering Department Universidade Federal de Minas Gerais Brazil pmxesteves 2Electrical Engineering Department Centro Federal de Educação Tecnológica de Minas Gerais Brazil

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The ball mill is the most common ore grinding technology today and probably more than 50% of the total world energy consumption for ore grinding is consumed in ball mills

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SIMINE MILL Whether SAG or Ball Mill space is a sensitive subject especially in the con centrator That s why we always of between 40° and 70° and the load torque decreases This decre the effective flux To calculate flux conditions the motor is simu In 1970 the first Gearless Drive was installed for a cement mill rated

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load orientation in terms of toe and shoulder positions A load beam was used to measure the torque exerted by the charge The variation in load orientation and mill power with speed among different media shapes was observed Higher shoulder positions were noted with cylpebs than with worn and spherical balls

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to bottom of the ball mill cavity and the balls will rap materials as shown in Small balls will grind material at the bottom of the cavity [5 6] Nearly all materials can be

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spherical balls change shape through breakage and wear Though this is universal in milling its contribution and effect on milling kinetics load behaviour and mill power is not fully established One area that is usually ignored is the relationship between media shape and mill power

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The design of a ball mill can vary significantly depending on the size the equipment used to load the starting material feeders and the system for discharging the output product The size of a mill is usually characterized by the ratio length to diameter and this ratio most frequently varies from to The

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The ball load should be 40 58% of the total internal mill volume and the material to be ground should fill only the voids between the balls a maximum of twice the ball space Viscosity the order of filler addition and the quantity of material should be chosen so as not to cause a viscosity increase above the specified range since the

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· Thus a small ball load and a low mill speed are preferable from the point of view of variation in the specific energy consumption with particle load However in doing so one has to take in to account the mill production rate also Reasonably high levels of ball load and mill speed are required to maintain a high production rate

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