Planetary Ball Mill PM 100
Артикул: РМ 100
The Planetary Ball Mill PM 100 is a powerful benchtop model with a single grinding station and an easy-to-use counterweight which compensates masses up to 8 kg. It allows for grinding up to 220 ml sample material per batch.
The extremely high centrifugal forces of Planetary Ball Mills result in very high pulverization energy and therefore short grinding times.
The PM 100 can be found in virtually all industries where the quality control process places the highest demands on purity, speed, fineness and reproducibility.
The mill is ideally suited for tasks in research like mechanochemistry (mechano-synthesis, mechanical alloying and mechanocatalysis), or ultrafine colloidal grinding on a nanometer scale, as well as for routine tasks such as mixing and homogenizing soft, hard, brittle or fibrous materials.
THE IDEAL BALL MILL FOR STANDARD APPLICATIONS
- Max. speed 650 rpm
- Up to 10 mm feed size and 0.1 µm final fineness
- 1 grinding station for jars from 12 ml up to 500 ml
- Jars of 12 – 80 ml can be stacked (two jars each)
- GrindControl to measure temperature and pressure inside the jar.
- Aeriation lids to control the atmosphere inside the jar
- Storable SOPs and cycle programs, 5 different jar materials for dry and wet grinding
FAST & POWERFUL
- Loss-free size reduction down to the submicron range
- Wet grinding yields particle sizes in the nanometer range (<100 nm)
- Variable speed from 100 to 650 rpm,
- speed ratio 1:-2
- Grinding with up to 33.3 x acceleration of gravity
- Batch-wise processing with max. 1 x 220 ml sample
- 2 x 20 ml sample per batch with stacked jars
REPRODUCIBILITY, SAFETY AND EASY HANDLING
- Reproducible results due to speed control
- Easy and safe clamping of grinding jars
- The Safety Slider prevents starting the machine without securely clamped jars
- Perfect stability on the lab bench thanks to FFCS technology
- Innovative counterweight and imbalance sensor for unsupervised operation
- Comfortable parameter setting via display and ergonomic 1-button operation
- Automatic grinding chamber ventilation
- 10 SOPs can be stored, programmable starting time
- Power failure backup ensures storage of remaining processing time
SETTINGS & OPTIONS
- Dry and wet grinding possible
- Suitable for long-term trials, 99 h max.
- Interval operation allows for cooling breaks
- Direction reversal helps to minimize caking effects
WET AND NANO-SCALE GRINDING WITH THE PM 100
Wet grinding is used to obtain particle sizes below 5 µm, as small particles tend to get charged on their surfaces and agglomerate, which makes further grinding in dry mode difficult. By adding a liquid or dispersant the particles can be kept separated.
To produce very fine particles of 100 nm or less (nano-scale grinding) by wet grinding, friction rather than impact is required. This is achieved by using a large number of small grinding balls which have a large surface and many friction points. The ideal filling level of the jar should consist of 60 % small grinding balls.
For more details on jar filling, wet grinding and sample recovery watch the video.
The graphic shows the result of grinding alumina (Al2O3) at 650 rpm in the PM 100. After 1 h of size reduction in water with 1 mm grinding balls, the mean value of the particle size distribution is 200 nm; after 4 h it is 100 nm.м | In another trial, the material was first pulverized for 1 hour with 1 mm grinding balls and then for 3 hours with 0.1 mm grinding balls. In this case, an average size of 76 nm was achieved. |
TYPICAL SAMPLE MATERIALS
RETSCH planetary ball mills are perfectly suitable for size reduction of, for example, alloys, bentonite, bones, carbon fibres, catalysts, cellulose, cement clinker, ceramics, charcoal, chemical products, clay minerals, coal, coke, compost, concrete, electronic scrap, fibres, glass, gypsum, hair, hydroxyapatite, iron ore, kaolin, limestone, metal oxides, minerals, ores, paints and lacquers, paper, pigments, plant materials, polymers, quartz, seeds, semi-precious stones, sewage sludge, slag, soils, tissue, tobacco, waste samples, wood, etc.
| TOUGH-FIBROUS: WOOD
40 g sample 500 ml stainless steel grinding jar 8 x 30 mm stainless steel grinding balls 5 min at 380 rpm | HARD-BRITTLE: MAGNETITE
315 g sample 250 ml tungsten carbide grinding jar 15 x 20 mm tungsten carbide grinding balls 5 min at 500 rpm | MEDIUM-HARD: SOIL
45 ml sample 125 ml stainless steel grinding jar 7 x 20 mm stainless steel grinding balls 2 min at 400 rpm | FIBROUS: DRIED GRASS
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| MEDIUM-HARD/ FIBROUS: SEWAGE SLUDGE 20 g sample 125 ml zirconium oxide grinding jar 50 x 10 mm zirconium oxide grinding balls 30 min at 380 rpm with direction reversal | MEDIUM-HARD: LIMESTONE 170 ml sample 500 ml zirconium oxide grinding jar 8 x 30 mm zirconium oxide grinding balls 3 min at 450 rpm | HARD-BRITTLE: LAPIS LAZULI
4 sample pieces 50 ml zirconium oxide grinding jar 3 x 20 mm zirconium oxide grinding balls 2 min at 420 rpm | SOFT - WET GRINDING: CAROTENE
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TECHNICAL DATA
| Applications | pulverizing, mixing, homogenizing, colloidal milling, mechanical alloying, mechanosynthesis, nano grinding |
| Field of application | agriculture, biology, chemistry, construction materials, engineering / electronics, environment / recycling, geology / metallurgy, glass / ceramics, medicine / pharmaceuticals |
| Feed material | soft, hard, brittle, fibrous - dry or wet |
| Size reduction principle | impact, friction |
| Material feed size* | < 10 mm |
| Final fineness* | < 1 µm, for colloidal grinding < 0.1 µm |
| Batch size / feed quantity* | max. 1 x 220 ml, max. 2 x 20 ml with stacked grinding jars |
| No. of grinding stations | 1 |
| Speed ratio | 1 : -2 |
| Sun wheel speed | 100 - 650 min-1 |
| Effective sun wheel diameter | 141 mm |
| G-force | 33.3 g |
| Type of grinding jars | EasyFit, optional areation covers, safety closure devices |
| Material of grinding tools | hardened steel, stainless steel, tungsten carbide, agate, sintered aluminum oxide, silicon nitride, zirconium oxide |
| Grinding jar sizes | 12 ml / 25 ml / 50 ml / 80 ml / 125 ml / 250 ml / 500 ml |
| Stackable grinding jars | 12 ml / 25 ml / 50 ml / 80 ml |
| Setting of grinding time | digital, 00:00:01 to 99:59:59 |
| Interval operation | yes, with direction reversal |
| Interval time | 00:00:01 to 99:59:59 |
| Pause time | 00:00:01 to 99:59:59 |
| Storable SOPs | 10 |
| Interface | RS 232 / RS 485 |
| Drive | 3-phase asynchronous motor with frequency converter |
| Drive power | 750 W |
| Electrical supply data | different voltages |
| Power connection | 1-phase |
| Protection code | IP 30 |
| Power consumption | ~ 1250W (VA) |
| W x H x D closed | 640 x 480 (780) x 420 mm |
| Net weight | ~ 86 kg |
| Standards | CE |
| Patent / Utility patent | Counter weight (DE 20307741), FFCS (DE 20310654), SafetySlider (DE 202008008473) |
FUNCTIONAL PRINCIPLE
The grinding jar is arranged eccentrically on the sun wheel of the planetary ball mill. The direction of movement of the sun wheel is opposite to that of the grinding jars in the ratio 1:-2. The grinding balls in the jars are subjected to superimposed rotational movements, the so-called Coriolis forces. The difference in speeds between balls and jars produces an interaction between frictional and impact forces, which releases high dynamic energies. The interplay between these forces produces the high and very effective degree of size reduction of the planetary ball mill, both, in ball to ball and ball to wall interactions.
Planetary mills with a single grinding station require a counterweight for balancing purposes. In the Ball Mill PM 100 this counterweight can be adjusted on an inclined guide rail. In this way the different heights of the centers of gravity of differently-sized jars can be compensated in order to avoid disturbing oscillations of the machine.
Any remaining vibrations are compensated by feet with some free movement (Free-Force Compensation Sockets). This innovative technology is based on the d’Alembert principle and allows very small circular movements of the machine housing that result in an automatic mass compensation. The laboratory bench is only subjected to minimal frictional forces generated in the feet.
In this way the planetary ball mill PM 100 ensures a quiet and safe operation with maximum compensation of vibrations even with the largest pulverization forces inside the grinding jars and therefore can be left on the bench unsupervised.