Ball Mill
Categories: Engineering Lab EquipmentBall mills are a form of mills with grinding bodies. The drums can be opened at the front and loaded with the material to be milled (limestone is recommended) and the milling balls. The drums are moun...
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Description
Ball mills are a form of mills with grinding bodies. The drums can be opened at the front and loaded with the material to be milled (limestone is recommended) and the milling balls. The drums are mounted on a drive roller and a loose roller with adjustable spacing between the axles. At low rotation speeds the comminution is effected by the balls rolling over the material (cascade motion). At higher speeds, some balls are lifted up the wall, become detached and drop down onto the material to be milled (cataract motion). Above the critical speed, centrifugal forces ensure that no more comminution takes place. These motion states can be observed through the transparent fronts of the drums.
In order to compare the theoretical power demand with the actual, the power consumption of the drive motor is indicated on a digital display. To assess the success of the comminution, an analytical screening machine is recommended.
Learning Objectives/Experiments
Cascade and cataract motion, critical speed
Theoretical and actual power demand
Degree of comminution dependent on milling time, rotation speed, ball diameter, ball filling, material to be milled
Specification
Comminution of solids with a ball mill
2 drums with steel jackets and transparent fronts, 1 steel drum with lifting bars
1 drive roller with adjustable speed, 1 loose roller
Axle spacings of rollers adjustable to accommodate different drums
Measurement of power consumption
Milling time programmable by timer
Technical data
2 drums with borosilicate fronts
Ø 100mm/185mm
capacity: approx. 1,15L/7,5L
1 drum with lifting bars
Ø 185mm
capacity: approx. 7,5L
Drive roller, loose roller
Ø approx. 50mm
1 set of milling balls
Ø 5/10/15mm
Measuring ranges
power consumption: 0…200W
speed: 0…370min-1
230V, 50Hz, 1 phase
230V, 60Hz, 1 phase
120V, 60Hz, 1 phase
quick overview :
Ball mills are a form of mills with grinding bodies. The drums can be opened at the front and loaded with the material to be milled (limestone is recommended) and the milling balls. The drums are mounted on a drive roller and a loose roller with adjustable spacing between the axles. At low rotation speeds the comminution is effected by the balls rolling over the material (cascade motion). At higher speeds, some balls are lifted up the wall, become detached and drop down onto the material to be milled (cataract motion). Above the critical speed, centrifugal forces ensure that no more comminution takes place. These motion states can be observed through the transparent fronts of the drums.
In order to compare the theoretical power demand with the actual, the power consumption of the drive motor is indicated on a digital display. To assess the success of the comminution, an analytical screening machine is recommended.
Learning Objectives/Experiments
Cascade and cataract motion, critical speed
Theoretical and actual power demand
Degree of comminution dependent on milling time, rotation speed, ball diameter, ball filling, material to be milled
Specification
Comminution of solids with a ball mill
2 drums with steel jackets and transparent fronts, 1 steel drum with lifting bars
1 drive roller with adjustable speed, 1 loose roller
Axle spacings of rollers adjustable to accommodate different drums
Measurement of power consumption
Milling time programmable by timer
Technical data
2 drums with borosilicate fronts
Ø 100mm/185mm
capacity: approx. 1,15L/7,5L
1 drum with lifting bars
Ø 185mm
capacity: approx. 7,5L
Drive roller, loose roller
Ø approx. 50mm
1 set of milling balls
Ø 5/10/15mm
Measuring ranges
power consumption: 0…200W
speed: 0…370min-1
230V, 50Hz, 1 phase
230V, 60Hz, 1 phase
120V, 60Hz, 1 phase
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