Disc mill RS 200

batchlaboratoryfor sample preparation

Overview
No grinder can beat the speed of a Vibratory Disc Mill when it comes to preparing samples for spectral analyses. The Vibratory Disc Mill RS 200 is designed 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 with excellent reproducibility.

Highlights / Features

• Very short grinding times, typically 60 to 180 seconds to achieve ~100 µm fineness
• Ergonomic design with carry handles for easy handling of the grinding jars
• Quick-action clamping system for convenient and safe tightening of the grinding set
• Automatic speed reduction for agate and tungsten carbide grinding sets
• Powerful Stabilized-Plane-Drive for improved reproducibility
• Variable speed continuously adjustable from 700 to 1,500 rpm

Performance & Test Summary
The Stabilized-Plane-Drive allows extremely rapid formation of movement patterns of the free masses inside the grinding jar, resulting in higher fineness and significantly better reproducibility. In performance tests the RS 200 achieved a d90 value of 106 µm after only 15 seconds in a Quarter Minute Test and shows low standard deviation for d90 after short grinding times, which is critical for reproducible XRF measurements.

Grinding parameters (example)

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

Operation and Handling
Operation is ergonomic and simple: grinding jars have carry handles to transport heavy jars to the mill and slide them on a rail into the grinding station. A clamping device safely fastens the jar with less force and a sensor checks correct jar position. Grinding parameters are entered with a single button, up to 10 parameter combinations can be stored, and the menu guidance is available in multiple languages. A colored graphics display shows service and operating information.

Grinding Sets
The grinding sets are developed for high throughput and high mechanical stress. Key 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 for sample information
• Available in 3 sizes and 5 materials

Powerful Twin Pack for XRF Analysis
For accurate and reproducible XRF results, a uniform particle size distribution and dense pressed pellet are required. The RS 200 provides the rapid pulverization needed to achieve these sample preparation goals for XRF analysis.

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 and similar medium-hard to hard, brittle or fibrous materials.

Functional Principle
The RS 200 comminutes by pressure and friction. The grinding set is firmly attached to the vibration plate with a quick-action lever and subjected to circular horizontal vibrations. Centrifugal force acting on the grinding rings results in extreme pressure and frictional forces on the sample, producing analytical fineness in 1–3 minutes. Circular vibrations are produced by a frequency-controlled 1.5 kW 3-phase motor. A sensor recognizes agate grinding sets and limits speed to avoid damage. The noise-insulated grinding chamber cover has a safety interlock and can only be opened when the mill is at a standstill.

Technical Data
Applications: size reduction, mixing, triturating
Field of application: construction materials; environment / recycling; geology / metallurgy; glass / ceramics
Feed material: medium-hard, hard, brittle, fibrous
Size reduction principle: pressure, friction
Material feed size*: < 15 mm
Final fineness*: < 20 µm
Batch size / feed quantity*: 15–250 ml depending on grinding set size
Speed at 50 Hz (60 Hz): 700–1,500 min-1, continuously adjustable
Material of grinding tools: hardened steel, tungsten carbide, agate, zirconium oxide, steel 1.1740 (heavy-metal free option)
Grinding jar sizes: 50 ml / 100 ml / 250 ml
Setting of grinding time: digital, 00:01 to 99:59
Storable SOPs: 10
Drive: 3-phase asynchronous motor with frequency converter
Drive power: 1.5 kW
Electrical supply data: different voltages (configurable)
Power connection: 1-phase
Protection code: IP 20
W x H x D closed: 836 x 1220 x 780 mm
Net weight: ~225 kg (without grinding set)
Standards: CE

Specifications / Technical data

• Model: RS 200
• Drive power: 1.5 kW frequency-controlled 3-phase motor
• Speed range: 700–1,500 min-1 (continuously adjustable)
• Grinding jar volumes: 50 ml, 100 ml, 250 ml
• Final fineness (typical): < 20 µm (depending on feed material and configuration)
• Batch size: 15–250 ml depending on grinding set
• Materials for grinding tools: hardened steel, tungsten carbide, agate, zirconium oxide, steel 1.1740 (heavy-metal free)
• Storable SOPs: 10
• Dimensions (closed): 836 x 1220 x 780 mm
• Net weight: ~225 kg (without grinding set)
• Protection: IP 20