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Vibratory Disc Mill RS 200 Fast sample homogenization for spectral analysis

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No grinder can beat the speed of a Vibratory Disc Mill when it comes to preparing samples for spectral analyses. RETSCH’s Vibratory Disc Mill RS 200 is ideally suited for fast and reproducible pulverization of hard, brittle and fibrous sample materials to analytical fineness.

The RS 200 runs steadily and smoothly, even with heavy grinding sets and at maximum speed thanks to its powerful Stabilized-Plane-Drive. It achieves grind sizes between 20 and 100 microns within seconds and with excellent reproducibility.

Grinding sets are available in a variety of sizes and materials. A set of sensors will recognize jars of tungsten or agate and automatically sets the maximum permissible speed, ensuring optimum results while protecting the material.

Fast & Reproducible

  • Very short grinding times, typically in the range of 60 to 180 seconds to achieve a fineness around 100 μm
  • Ergonomic design and carry handles ensure easy handling of the grinding set
  • Quick-action clamping system enables convenient and safe tightening of the grinding set
  • Automatic speed reduction for agate and tungsten carbide sets
  • Powerful Stabilized-Plane-Drive improves reproducibility
  • Variable speed from 700 to 1500 rpm

Vibratory Disc Mill RS 200 Performance Test: Size reduction and reproducibility

The grinding results of a vibratory disc mill are significantly influenced by the movement patterns of the free masses inside the grinding jar. The new, powerful Stabilized-Plane-Drive of the RS 200 allows for extremely rapid formation of the movement pattern which is reflected in higher fineness and ultimately leads to significantly better reproducibility.

Figure 1 shows the standard deviation after 60 sec grinding time. It only takes a few large particles to impair the reproducibility of XRF measurements. Because of that, a small standard deviation for the d90 value is crucial.

Fig. 2: A “Quarter Minute Test” (QMT) evaluates the formation and stability of the movement patterns of Vibratory Disc Mills. Figure 2 shows that with the RS 200 a d90 value of 106 μm was obtained after a grinding time of only 15 seconds. The mills from three other manufacturers showed considerably inferior results.

Performance Test: Size reduction and reproducibility

Grinding parameters

  • Grinding jar: 100 ml
  • Sample: cement clinker 0.85 to 3.15 mm
  • Speed: Maximum (1200 rpm)
  • Grinding time: 60 sec (Figure 1), 15 sec (Figure 2)

Vibratory Disc Mill RS 200 Exceptionally safe and simple handling

Operation and handling of the RS 200 and its grinding sets is convenient and ergonomic. The grinding jars are equipped with carry handles which facilitate transport of the heavy jar to the mill where it is slid on a rail into its grinding station. The clamping device allows for safe fastening of the jar with less force; a sensor checks its correct position.

The grinding parameters are entered using a single button. The user can store up to 10 parameter combinations and choose between 13 languages for menu guidance. In addition to the current settings a colored graphics display shows service and operating information.

carry handles

carry handles

rail

rail

quick-action clamping device

quick-action clamping device

graphic display

graphic display

The grinding sets have been developed especially for extreme test conditions such as high sample throughput and high mechanical stress. Features include.

  • safe, non-slip attachment with integral safety devices on cover and base
  • gap between dish and cover edge for easy opening
  • optimum sealing with O-ring
  • protective jacket made from stainless steel (for agate, zirconium oxide and tungsten carbide dishes)
  • grinding set identification (article number, material and volume)
  • marking field (e. g. for information about sample)
  • available in 3 sizes and 5 materials
Grinding jar

Powerful Twin Pack for XRF Analysis

To ensure accurate and reproducible XRF analysis results, the sample needs to have a uniform particle size distribution and the pellet to be pressed needs to be as dense as possible. Both requirements are easily met when using our vibratory disc mills and pellet presses for sample preparation to XRF analysis.

Vibratory Disc Mill RS 200 & Pellet Press PP 40

Vibratory Disc Mill RS 200 Typical Sample Materials

RETSCH’s Vibratory Disc Mills rapidly pulverize materials such as cement, cement clinker, ceramics, coal, coke, concrete, corundum, glass, metal oxides, minerals, ores, silicate, slag, soil, etc.

 slag

slag

 electronic scrap

electronic scrap

iridium

iridium

dolomite

dolomite

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

Vibratory Disc Mill RS 200 Technical Data

Vibratory Disc Mill RS 200 Functional Principle

The Vibratory Disc Mill RS 200 comminutes by pressure and friction. The grinding set is firmly attached to the vibration plate with a quick-action lever. The plate with the grinding set is subjected to circular horizontal vibrations.

The centrifugal force acting on the grinding rings in the dish results in extreme pressure and frictional forces acting on the sample, producing analytical fineness in 1-3 minutes. The circular vibrations are produced by a frequency controlled 1.5 kW 3-phase motor.  A sensor recognizes the presence of agate grinding sets and automatically limits the speed to 700 min-1 to avoid damaging the agate. The cover of the noiseinsulated grinding chamber has a safety interlock and can only be opened when the mill is at a standstill.

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