The Drum Mill TM 500 is a laboratory ball mill designed to grind large sample volumes up to 35 l. It accepts initial feed sizes of up to 20 mm and can achieve grind sizes down to 15 µm by friction and impact. Hard, brittle or fibrous samples are pulverized in the 150 l drum filled with 80 kg grinding balls. The variable speed of 10 to 50 rpm, different grinding ball sizes and the possibility of long-term grindings of up to 100 h ensure perfect adaption to sample properties as well as reproducible results. A TM 500 foodGrade model featuring a stainless steel 316L drum and hopper is available for applications where the sample must not be contaminated in any way.
Thanks to the feed hopper and optional separating screen for grinding balls/ sample, operation of the TM 500 and handling of the required 80 kg of grinding balls are particularly ergonomic and simple. The drum is easily emptied by an electronic tilt function. Parameters like grinding time, start delay, or interval mode are selected and stored conveniently via the operating display. Thanks to programmable grinding breaks it is also possible to process heat-sensitive sample materials. Intervals with forward and reverse mode combination are useful to avoid caking effects. For additional safety, the drum mill is equipped with an emergency switch for instant turn-off.
40 kg (27 l) sample were filled in the drum of the Drum Mill TM 500, and 80 kg (17.6 l) of 20 mm grinding balls were added. The drum mill was operated for several hours at 50 rpm.
The fineness was measured after 2, 4, 6 and 8 h.
2h: D90 = 98 µm
4h: D90 = 37 µm
6h: D90 = 21 µm
8h: D90 = 15 µm
Sample: Gravel 10-15 mm
Feed quantity: 27 l
Grinding balls: 80 kg, 20 mm diameter
RETSCH drum mills are true allrounders. They homogenize, for example: activated carbon, alloys, bentonite, bones, carbon fibers, catalysts, cellulose, cement clinker, ceramics, chemical products, clay minerals, coal, coke, compost, concrete, electronic scrap, fibers, gypsum, glass, hair, hydroxyl apatite, kaolin, lime stone, metal oxides, minerals, ores, paint and varnish, paper, pharmaceutical products, pigments, plants, polymers, quartz, seeds, semi-precious stones, sewage sludge, slag, soil, tissue, tobacco, waste, wood, etc.
22 l sample were filled in the drum of the Drum Mill TM 500, 80 kg of 30 mm grinding balls were added. The drum mill was operated for several hours at 50 rpm. The fineness was measured after 1 h.
1h: D90 = 130 µm
The optional separation unit to separate the ground sample from the balls was used.
Used separationd grids: 22 mm for 30 mm grinding ball separation in the upper, middle and lower position.
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For applications requiring heavy-metal free processing, a foodGrade version of the TM 500 is available which features a stainless steel 316L drum and feed hopper. Grinding balls made of 1.4404 steel are available in sizes 10 mm, 20 mm and 30 mm. This version is ideally suited for small scale production, for example in the food industry.
The optionally available sieve section facilitates the separation of the 80 kg grinding balls from the ground sample, which can contain up to 35 l. The drum is rotated so that the material falls onto the sieve section and the balls roll into a collecting vessel. The sample material is separated beforehand by the mesh inserts and is collected in separate collecting vessels. Common grinding ball sizes are 10, 20 or 30 mm, therefore three different separation grids can be used, which are also available in steel 316L.
|Applications||pulverizing, mixing, dry grinding|
|Field of application||Chemistry, agriculture, biology, construction materials, engineering / electronics, environment / recycling, geology / metallurgy, glass / ceramics, medicine / pharmaceuticals|
|Feed material||soft, hard, brittle, fibrous|
|Size reduction principle||friction, impact|
|Material feed size*||< 20 mm|
|Final fineness*||< 15 µm|
|Batch size / feed quantity*||min. 1 l / max. 35 l|
|Rotation speed||10 - 50 min-1|
|No. of grinding stations||1|
|Material of grinding tools||hardened steel, stainless steel, steel 316L|
|Grinding drum sizes||150 l|
|Setting of grinding time||digital, 00:00:01 to 99:59:59|
|Drive||3-phase asynchronous motor with frequency converter|
|Drive power||2.2 kW|
|Electrical supply data||200-240 V, 50/60 Hz|
|Protection code||IP 30|
|Power consumption||~ 2200 W (VA)|
|W x H x D closed||1100 x 1604 x 936 mm|
|Net weight||~ 460 kg|
In a drum mill the sample (usually pre-crushed material) is placed inside the drum with the grinding balls and subjected to external forces.
The Ball Mill is used for fine grinding of solid matter by impact and friction in dry condition. The drum, which contains the sample and grinding balls, rotates around a horizontal axis. Whereas particles break more easily when larger grinding ball diameters are used, smaller diameters lead to a substantially higher final fineness.
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