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Vibratory disc mill

Ultra-fine grinding, fast and reproducible
Vibratory disc mill

Vibratory disc mill
Fig. 1: Up to ten parameter combinations can be stored for the RS 200 Fig. 2: Comparison of the size reduction performance of the RS 200 with disc mills from other manufacturers
The RS 200 vibratory disc mill is used for quick, loss-free grinding of hard, brittle and fibrous materials to analytical fineness. Compared to its predecessor, the RS 200 has a much more powerful motor that generates a further increase in energy input and therefore in grinding performance. The drive kinematics have been optimised in such a way that the grinding results, even after short grinding times, exhibit a very high degree of reproducibility.

The RS 200 vibratory disc mill (Fig. 1) is very convenient to operate. The grinding parameters are entered using a single button, and in addition to the current settings a graphics display shows service and operating information. Up to ten parameter combinations can be stored and users can choose from thirteen different menu languages. This powerful instrument runs steadily and smoothly, even with heavy grinding sets and at maximum speed.

A comprehensive range of grinding sets is available for the RS 200. In addition to materials such as special steel, tungsten carbide, agate and zirconium oxide, a steel version is available for heavy-metal-free grinding. Grinding dishes with a nominal volume of 50, 100 or 250 ml can be used, depending on the amount of sample. A grinding set for the vibratory disc mill consists of a grinding dish with cover containing the grinding tools – a disc and a ring.
These grinding sets are characterised by the following advantages:
  • Secure seat due to the built-in anti-twist safeguards on the cover and base
  • User-friendly gripping edges on the dish and cover
  • Protective jacket made of stainless steel (for agate, zirconium oxide and tungsten carbide sets)
  • Optimal sealing with O-ring
The sets were specially developed for extreme trial conditions, such as a high sample throughput and high mechanical stress.
Size reduction performance and reproducibility
Vibratory disc mills are designed to achieve the reproducible degree of fineness required for spectral analysis in a short grinding time. The grinding results are significantly influenced by the movement patterns of the free masses. A quarter-minute test (QMT) evaluates the formation and stability of the vibratory disc mill’s movement patterns. Figure 2 shows that with the RS 200 a d90 value of 106 µm was achieved after a grinding time of only 15 s.
The superiority of the RS 200’s drive kinematics is proven by its high final fineness as well as its remarkable reproducibility. In another trial under the same conditions it was ascertained that the grinding results of the RS 200 exhibit the smallest standard deviation after 60 s (Fig. 3). Taking into account that a few large particles suffice to worsen the reproducibility of XRF measurements, a small standard deviation for the d90 value is crucial.
As a useful addition to sample preparation for XRF analysis with the RS 200, Retsch now offers a semi-automatic pellet press, the PP 40. This instrument features individual pressure force regulation and controls not only the pressure force but also the pressure build-up and release during the pressing process. This reduces the internal stress on the sample and ensures that even difficult materials are pressed perfectly. The combined use of RS 200 and PP 40 allows a substantially higher sample throughput for spectral analysis.
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