Disc mill DM 200

for researchpilotlaboratory

Overview
Thanks to its robust design, the Disc Mill DM 200 is suitable for operation in laboratories, pilot plants and inline quality control of raw materials. The DM 200 delivers the required grind size within minutes and accepts feed sizes up to 60 mm in combi configurations.

Product advantages

• high comminution performance
• reproducible results thanks to precise gap setting
• hinged grinding chamber for easy cleaning
• long-life grinding discs
• various disc materials to avoid contamination
• connector for dust extraction
• can be combined with Jaw Crusher BB 250 or BB 200

Two-stage sample preparation (combi unit)
The combi unit, consisting of Jaw Crusher BB 250 and Disc Mill DM 200 connected via a cyclone separator, enables automated continuous sample preparation. Material is transported from the jaw crusher to the disc mill allowing large feed sizes to be processed to a defined final fineness in one step. This two-stage process is recommended for hard or brittle materials requiring coarse reduction followed by fine grinding. The combi unit reduces manual handling, processing time and dust emission while ensuring reproducible results for applications in agriculture, cement, mining, precious metal analysis, materials research and environmental analysis.

Application example of the combi unit

• Gap setting jaw crusher: 2 mm
• Gap setting disc mill: 0.2 mm
• Feed size: 60 mm
• Final fineness: 200 μm
• Sample amount: 1 kg
• Process time: 10 min

Cyclone System
The RETSCH Cyclone System improves efficiency, precision and safety in sample preparation and can be retrofitted to existing instruments.

• Total sample recovery
  Eliminate sample loss during crushing with the cyclone to ensure accurate and reproducible results.
• Enhanced operator safety
  The cyclone reduces dust exposure for a safer working environment.

Application examples

• bauxite
• cement clinker
• chalk
• chamotte
• coal
• coke
• concrete
• construction waste
• dental ceramics
• dried soil samples
• drilling cores
• electrotechnical porcelain
• ferro alloys
• glass
• granite
• gypsum
• hydroxyapatite
• ores
• quartz
• sewage sludge
• sintered ceramics
• slag
• soils
• steatite
• ... (and similar materials)

Functional principle
Feed material enters the dustproof chamber from the hopper and is fed centrally between two vertical grinding discs. A rotating disc moves against a fixed disc and draws in the material. Comminution results from pressure and friction. Staggered disc meshing performs pre-crushing; centrifugal force moves particles to the outer disc regions for fine comminution. The processed sample exits through the grinding gap and is collected. The gap width is continuously adjustable during operation between 0.05 (or 0.1 depending on configuration) and 5 mm; an observation window allows checking the gap.

Technical specifications

• Applications: preliminary and fine grinding
• Fields of application: chemistry/plastics, construction materials, engineering/electronics, geology/metallurgy, glass/ceramics
• Feed material: medium-hard, hard, brittle
• Size reduction principle: pressure, friction
• Material feed size*: < 20 mm
• Final fineness*: 50 µm (hardened steel discs); 100 µm (tungsten carbide or zirconium oxide discs)
• Speed at 50 Hz (60 Hz): 440 min-1 (528 min-1)
• Grinding tool materials: zirconium oxide, hardened steel, tungsten carbide, manganese steel
• Gap width setting: continuous, 0.05 - 5 mm
• Rotating direction: reversible to extend disc life
• Collector capacity: 2.5 l
• Drive: three-phase geared motor
• Drive power: 1.5 kW
• Electrical supply: various voltages
• Power connection: three-phase
• Protection rating: IP 55
• Dimensions W x H x D closed: 440 x 400 x 870 mm
• Net weight: ~ 140 kg
• Standards: CE
• *depending on feed material and instrument configuration/settings