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Drum Mill TM 300

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The TM 300 Drum Mill is utilized for preparing granules and powders through a grinding process conducted in either dry or wet conditions. This versatile grinder can function as either a Ball or a Rod Mill by employing the corresponding module. To ensure an efficient grinding process, it is essential to use a sufficient number of balls or rods. Depending on the sample material, a final fineness below 20 microns can be achieved.

The drum mill comprises a gear motor mounted on a robust steel frame, a set of separation grids, and a sample collector. The TM 300 is designed with a yoke and locking mechanism that facilitates easy access to the sample. Cleaning is made convenient by a quick-release locking mechanism, allowing effortless removal of the drum cover.

The TM 300 accepts sample volumes up to 20 l and is therefore also suited for upscaling processes.

Drum Mill TM 300 Benefits at a glance

  • Powerful and quick processing of large quantities up to 20 l
  • Suitable for dry and wet grinding
  • Standard drum sizes range from 5 l to 43.4 l
  • Variable speed and reproducible results
  • Suitable for long term grindings
  • Ball and rod modules available
  • Ideal for upscaling tests in mechanochemistry
Grinding drum

Drum Mill TM 300 Safe and convenient operation

The TM 300 stands out for its user-friendly features. The easy tilt mechanism facilitates the swift and uncomplicated emptying of the grinding jar. The removable sample collector simplifies the sample retrieval process, making it convenient for operators to access their collected materials.

The solid noise-protection hood contributes to a quieter and more comfortable working environment.

The TM 300 is equipped with an emergency switch, providing a quick and reliable means to halt the milling process in case of unforeseen circumstances, underscoring the commitment to user safety.

Parameter setting

Process parameters like grinding time or start/stop are conveniently set via the TM 300's large display interface. Settings include:

  • Variable speed from 1 to 80 rpm
  • Grinding time of up to 99:59:59 h:min:s
  • Rotation direction, e. g. to reduce caking effects
  • Programmable interval & break options for temperature-sensitive samples
  • Delayed start function

TM 300 display

Drum Mill TM 300 Accessories for effective grinding processes

Catering to various application needs, the TM 300 offers standard grinding drums ranging from 5 to 43.4 liters. This ensures that the mill is adaptable to a wide spectrum of processing tasks.

An optional separation grid provides convenient separation of balls and sample after the grinding process. It is suitable for grinding balls sized 10, 20 or 30 mm. A connection for dust extraction prevents release of dust.

The grinding jar comes equipped with a gasket, ensuring a secure seal for loss-free milling operations. This feature not only enhances the efficiency of the process but also minimizes the risk of material waste.

5-liter Grinding drum

5-liter Grinding drum

21.7-liter Grinding drum

21.7-liter Grinding drum

Separation grid

Separation grid

Drum Mill TM 300 Drum filling level for grinding balls and rods

While the maximum sample feed size depends on properties like hardness and breaking behaviour, a particle size of approximately 5 mm is ideal for the TM 300. Larger sizes are acceptable but should not exceed 15 mm. For sample lumps which break very easily or for deagglomeration effects, a feed size between 20 and 30 mm is feasible. For such easy-to-process samples, the sample filling level may be increased to 20 l.

If special drums of stainless steel 1.4404 in sizes 21.7 / 10 / 5 l together with grinding balls of steel 1.4404 are employed, it is possible to carry out wet grinding in the TM 300. The total filling volume for wet grinding may exceed the recommended amount for dry grinding. It may be helpful to use a large number of small grinding balls to increase friction.

Grinding drum Mass of grinding balls Grinding ball size (mm) Number of rods Optimum sample volume (l)
5 l 10 kg <5 | 10 | 20 | 30 - 1 - 1.5
10 l up to 20 kg <5 | 10 | 20 | 30 - 2 - 2.5
21.4 l 40 kg <5 | 10 | 20 | 30 - 4 - 5
43.4 l - - 8 9 - 20

Drum Mill TM 300 Five drum positions for convenient handling

The user can set the grinding drums in five different positions which are secured by a screw. This ensures easy filling and emptying of the drum but also improves the mixing and grinding process. The largest rod module of 43.4 l cannot be brought into the mixing position due to lack of space.

Filling position

Filling position

Mixing position

Mixing position

Grinding position

Grinding position

Emptying position

Emptying position

Complete emptying position

Complete emptying position

Drum Mill TM 300 Special Application: Bond Index Test

Another application area of the TM 300 is Bond Index Testing. The Bond Work Index is used to assess the grinding efficiency and to calculate the necessary grinding power when choosing comminution equipment in the design phase of, for example, a mining plant. Precise determination of BWI is crucial for the accurate design and estimation of costs linked to the comminution process in industries like cement, mining or steel.

Both the Ball Mill and the Rod Mill module can be used for the process. At least 15 to 20 kg sample material is required to simulate a closed grinding circuit.

Ball Mill Module

The Ball Mill Work Index (BWI) is used for the range from 2.1 mm down to 100 µm. The sample needs to be pre-crushed to particle sizes as defined below.

  • Minerals: < 3.35 mm and sieved
  • Drillcore: < 3.35 mm and sieved
  • Half Drillcore: < 3.35 mm and sieved
The optimum number of grinding balls is 285. With the ball diameters varying due to wear, the overall 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.

Rod Mill Module

The Rod Mill Work Index (RWI) is used for particle size determination in a size range from 25 mm down to 2.1 mm. The sample needs to be pre-crushed to particle sizes as defined below.

  • Minerals: < 12.50 mm and sieved
  • Drillcore: < 12.50 mm and sieved
  • Half a drillcore: < 12.50 mm and sieved

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

Hard-brittle: ceramics
 ceramics

5 l sample
21.7 l ball module
Pre-grinding:
40 kg x 20 mm grinding balls
4 h at 60 rpm
Fine grinding:
40 kg x 10 mm grinding balls
5 h at 60 rpm

Hard-brittle: plastics

4.5 l sample
21.7 l ball module
Pre-grinding:
40 kg x 30 mm grinding balls
3 h at 60 rpm
Fine grinding:
40 kg x 10 mm grinding balls
4 h at 60 rpm

Medium-hard: soil
 soil

25 kg sample
43.4 l rod module
8 grinding rods
1 h at 80 rpm

Fibrous-tough: Sawdust
Sawdust

4.2 l sample
21.7 l ball module
40 kg x 30 mm grinding balls
5 h at 70 rpm

To find the best solution for your sample preparation task, visit our application database.

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