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  • Minerals pre-crushed to < 3.35 mm and sieved
  • Drillcore pre-crushed to < 3.35 mm and sieved
  • Half Drillcore pre-crushed to < 3.35 mm and sieved

The Bond Index conforming ball charge consists of:

  • 43 x 1.45” balls
  • 67 x 1.17” balls
  • 10 x 1” balls
  • 71 x 0.75” balls
  • 94 x 0.61” balls

The optimum number of grinding balls is 285. However, the ball diameters vary due to wear. Therefore, the total ball number should be adjusted from time to time to ensure a total mass of 20.125 grams.
The grinding jar of the Bond Index Ball Mill measures 12″ x 12″ and has well-rounded corners.
 
Module Rod Mill
  • Minerals pre-crushed to < 12.50 mm and sieved
  • Drillcore pre-crushed to < 12.50 mm and sieved
  • Half a drillcore pre-crushed to < 12.50 mm and sieved

The Bond Index conforming rod charge consists of:
  • 6 rods of 1.25“ diameter and 21“ length
  • 2 rods of 1.75“ diameter and 21“ length

The grinding jar for the Bond Index Rod Mill is 12″ x 24″ in size and has a wave-shaped design. 

At least 15 to 20 kg sample material is required to simulate a closed grinding circuit in a ball or rod mill.  The Rod Mill Work Index (RWI) is used for particle size determination in a size range from 25 mm down to 2.1 mm whereas Ball Mill Work Index (BWI) is used for the range from 2.1 mm down to 100 µm.

Adjustment of grinding parameters:
The operation display permits convenient selection and storage of parameters such as  rotation counter, rotation speed, grinding time, start and stop.

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  • suitable for the determination of Work Index according to Bond
  • available modules include Ball Mill and Rod Mil
  • easy tilt function to empty the drum
  • solid steel frame
  • removable sample collector
  • convenient parameter setting via display
  • funnel with handles
  • guide rail allows for ergonomic removal of jar
  • separation grid to separate sample from grinding balls (only for Ball Mill)
  • grinding jar with gasket for loss-free operation
  • solid noise-protection hood with safety switch
  • emergency switch

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Applications quantification of grindability of ores and minerals
Field of application construction materials, environment / recycling, geology / metallurgy
Feed material hard, brittle
Size reduction principle friction
Material feed size*
Final fineness*
Batch size / feed quantity* min. 15 kg with ball module / min. 20 kg with rod module
Rotation speed 70 min-1 with ball module / 46 min-1 with rod module
No. of grinding stations 1
Material of grinding tools hardened steel
Grinding jar sizes 21.7 l with ball module / 43.3 l with rod module
Setting of grinding time digital
Drive power 0.75 kW
Electrical supply data different voltages
Power connection 1-phase
Protection code IP 50
W x H x D closed 1500 x 1200 x 700 mm
Net weight ~ 295 kg
Standards CE
*depending on feed material and instrument configuration/settings

The ball and the rod mill basically have the same concept comprising either a 12x12’’ jar with grinding balls or a 12x24’’ jar with grinding rods.

The jar is attached to a rotating yoke which is driven by a motor and can be placed in three different positions: Upwards for loading, horizontal for grinding, downwards for discharging.

To carry out the Bond Index test the pre-defined number of grinding balls or grinding rods is required. The electronic control integrated in the drive is equipped with an overload protection and permits and controls different speeds.

During the grinding process the difference in speeds between the balls / rods and grinding jar produces an interaction between frictional and impact forces, which releases the required comminution energy. The interplay between these forces produces a very effective degree of size reduction.

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