ball mill design/power calculation

Jun 19, 2015 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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bond work index (energy equation) - grinding

The dry feed of a ball mill circuit is 300 t/h. The power at the pinion of the ball mill is 1800 kW. F80 = 80% passing size of the circuit feed, in microns = 2500 um. P80 = 80% passing size of the circuit product, in microns = 225 um Solution. Work Input (Energy input): W= (1800 kw)/ 300 t/h=6.0 kwh/t. Then. WI = Work Index of this circuit

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the energy efficiency of ball milling in comminution

Nov 01, 2002 Schellinger (1951) designed a grinding setup consisting of a laboratory ball mill rotating inside a calorimeter and attached to a torque meter. The calorimeter was used for measuring the amount of heat lost from the ball mill in the form of heat (energy output), and the torque meter was used for measuring the energy to the mill shell (energy

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comparison of energy efficiency between ball mills and

Jun 01, 2009 From the work reported earlier, it has been found that there exists a unique relationship between energy consumption measured by a digital energy meter and Bond ball mill revolutions for various types of ore and different grind sizes (Shi et al., 2006). The net specific energy of the Bond ball mill is then calculated from the ratio of the net

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amit 135: lesson 7 ball mills & circuits mining mill

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. The length-to-diameter ratios in the previous table are for normal applications. For primary grinding, the ratio could vary between 1:1and

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recommended ball mill speed & liner configuration

Oct 25, 2017 The ratio of active mill shell surface area to ball charge surface area for the 5.0 meter (16 foot) unit, is roughly half of that for the 2.4 meter (8 foot) unit. However, the actual ratios are so small (1 or 2 percent) that the amount of grinding at the shell is likely of little significance for either size

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energy use of fine grinding in mineral processing

Dec 18, 2013 The smallest ball size typically charged into ball mills and tower mills is inch (12.5 mm), although media diameters as small as 6 mm have been used industrially in Vertimills. In a laboratory study by Nesset et al .,[ 7 ] a GIS mill charged with 5-mm steel shot, and with other operating conditions similarly optimized, achieved high energy

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vertimill - metso outotec

In fact, in the same application a Vertimill has 50% less footprint than a ball mill. Lower operating cost. Vertimill is an energy efficient grinding machine. They tend to grind more efficiently than, for example, ball mills with feeds as coarse as 6 mm to products finer than 20 microns. This provides up to a 40% higher energy efficiency

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welcome to cps energy

CPS Energy is the nations largest municipally owned energy utility providing both natural gas and electric service. We serve more than 840,750 electric customers and 352,585 natural gas customers in and around San Antonio, the nations seventh largest city

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method of reducing wear when using special steel ball

Both methods can effectively reduce the energy consumption of the ball mill. 2. Reduce the particle size of the feed. The larger the particle size of the ball mill, the greater the workload of the ball mill, and the more work the ball mill has to do to achieve the required fineness. Energy consumption increases

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crushers report.doc - experiment-6(crushers objectives a

Introduce feed to the roll crusher, start the stop watch, note the time of crushing (t sec), note the number of pulses (NP 2) on the energy meter. 4. Run the roll crusher with no load condition for t sec and record the number of pulses on the energy meter (NP 1). 5. To switch off the machine push the red button and switch off MCB and main. 6

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