The Planetary Ball Mill PM 200 is a powerful benchtop model with 2 grinding stations for grinding jars with a nominal volume of 12 ml to 125 ml.
The extremely high centrifugal forces of Planetary Ball Mills result in very high pulverization energy and therefore short grinding times.
The PM 200 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.
TWO GRINDING STATIONS FOR STANDARD APPLICATIONS
Max. speed 650 rpm
Up to 10 mm feed size and 0.1 µm final fineness
2 grinding stations for jars from 12 ml up to 125 ml, jars of 12 and 25 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. 2 x 50 ml sample
Wide range of materials for contamination free grinding
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 200
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 barium titanate at 500 rpm in the PM 200. After 5 h of pulverization in heptane and oleic acid mixture with 0.5 mm grinding balls, the D90 value of the original sample was reduced from 15 µm to 95 nm.
Grinding of barium titanate in heptane and oleic acid mixture with 0.5 mm grinding balls.
Blue curve: original sample; green curve: pulverized sample after 5 h.
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.
Medium-hard: biomass
35 g sample
125 ml stainless steel grinding jars
7 x 20 mm stainless steel grinding balls
15 min at 500 rpm
Brittle: tin sulfide
52 g sample
125 ml agate grinding jars
50 x 10 mm agate grinding balls
60 min at 550 rpm
10 min intervals and direction reversal
Fibrous: straw
7 g sample
125 ml zirconium oxide grinding jars
50 x 10 mm zirconium oxide grinding balls
40 min at 300 rpm
10 min intervals and direction reversal
Hard: natural rocks
60 g sample
125 ml stainless steel grinding jars
7 x 20 mm stainless steel grinding balls
10 min at 420 rpm
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
~ 1250 W (VA)
W x H x D closed
640 x 480 (780) x 420 mm
Net weight
~ 76 kg
Standards
CE
Patent / Utility patent
SafetySlider (DE 202008008473)
*depending on feed material and instrument configuration/settings
FUNCTIONAL PRINCIPLE
The grinding jars are 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 grinding jars are subjected to superimposed rotational movements, the so-called Coriolis forces.
The difference in speeds between the balls and grinding 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.
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