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Keywords Ball mills grinding circuit process control I Introduction Grinding in ball mills is an important technological process applied to reduce the size of particles which may have different nature and a wide diversity of physical mechanical and chemical characteristics Typical examples are the various ores minerals limestone etc

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Sep 11 2014· At what speed will the mill have to be run if the 100 mm balls are replaced by 50 mm balls all the other conditions remaining the same Calculations The critical speed of ball mill is given by where R = radius of ball mill r = radius of ball For R = 1000 mm and r = 50 mm n c = 30 7 rpm But the mill is operated at a speed of 15 rpm

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Dec 12 2016· Ball Mill Power Calculation Example A wet grinding ball mill in closed circuit is to be fed 100 TPH of a material with a work index of 15 and a size distribution of 80 passing ¼ inch 6350

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Calculations for mill motor power mill speed and media charge Advantages Considering the weight of mill lining and grinding media work out the motor power required in consultation with the mill manufacturer To calculate the motor power required for a cylindrical type ball mill the following formula can be applied W = 0 04116 x D3 x

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Mill Critical Speed Determination The Critical Speed for a grinding mill is defined as the rotational speed where centrifugal forces equal gravitational forces at the mill shell s inside surface This is the rotational speed where balls will not fall away from the mill s shell

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PROCESS DIAGNOSTIC STUDIES FOR CEMENT MILL OPTIMISATION - CASE STUDY V K Batra D Bhaskara Rao and Raju Goyal • Empty heights of both the chambers measured to calculate the ball charge filling and estimate the power production is obtained from a ball mill when the mill motor power is at a maximum and consequently the specific

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EFFECTS OF GRINDING MEDIA SHAPES ON BALL MILL PERFORMANCE Niyoshaka Nistlaba Stanley Lameck A dissertation submitted to the Faculty of Engineering and The Built Environment University of the Witwatersrand Johannesburg in fulfilment of the requirements for the degree of Master of Science in Engineering Johannesburg October 2005

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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 tear

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The energy efficiency of ball milling in comminution Author links open overlay panel D W The net power required to operate the mill with the ball load of 33 kg and material charge of 3 kg was 0 07 kW Fig 9 presents the specific as the baseline for efficiency calculations ball mill efficiency for producing new quartz surface is

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The basic parameters used in ball mill design power calculations rod mill or any tumbling mill sizing are material to be ground characteristics Bond Work Index bulk density specific density desired mill tonnage capacity DTPH operating solids or pulp density feed size as F80 and maximum chunk size product size as P80 and maximum and finally the type of circuit open closed

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An interactive design tool for determination of ballmill power draw Notes on Ball Mill Design - Power Draw Power Draw is steady running power requirement ignoring drive-train losses and startup loads

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2 MODELLING THE SPECIFIC GRINDING ENERGY AND BALL-MILL SCALEUP Ball-mill scale up Bond s Law Data zBond work index w i zFeed D f and product d size both 80 cumulative passing Result The specific grinding energy w Mill power draw P = wT where T the mill capacity Mill dimensions from Tables or charts

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