Emax: High Energy Ball Mill from RETSCH

The Emax is a new kind of ball mill specifically designed for high energy milling. The unique combination of high impact and friction produces ultrafine particles in a very short amount of time.

The optimized jar design and an unrivaled speed of 2000 min-1 produces the high energy input. Thanks to the new cooling system with water, the high energy input is efficiently employed for the grinding process without overheating the sample. Because of the special grinding jar geometry, the sample is completely mixed which causes a narrow particle size distribution.

In contrast to other high energy ball mills, the Emax can provide continuous grinding operation without disruptions for cooling down. This significantly reduces the grinding time. The combination of the unique cooling system and the high energy input provides ideal conditions for effective grinding or mechanical alloying down to the nanometer range.

A wide range of safety features such as temperature control with automated start/stop system, integrated imbalance controls, and the incorporated safety closure of the grinding jar make the Emax bench-top mill’s operation very user-friendly.

Product Advantages

  • Speed of 2000 min-1 allows for extremely fast pulverization of the sample
  • Easy clamping of grinding jars
  • Finer and faster grinding than any other ball mill
  • Temperature-controlled grinding
  • Water cooling allows continuous operation without cool down breaks
  • Jars with integrated safety closure
  • Easy operation through touch screen, 10 SOPs storable
  • Narrow particle size distribution due to the special jar design which promotes mixing of the sample
  • Operation with 2 grinding jars
  • Patented drive concept
  • Different jar materials allow for contamination-free grinding

Features

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Applications nano grinding, size reduction, homogenizing, mechanical alloying, colloidal milling, high energy comminution
Field of application agriculture, biology, Chemistry, construction materials, engineering / electronics, environment / recycling, geology / metallurgy, glass / ceramics, medicine / pharmaceuticals
Feed material medium-hard, hard, brittle, fibrous - dry or wet
Size reduction principle impact, friction
Material feed size* < 5 mm
Final fineness* < 80 nm
Batch size / feed quantity* max. 2 x 45 ml
Speed at 50 Hz (60 Hz) 300 - 2000 min-1
Cooling controlled integrated water cooling / option: external chiller
Temperature control yes (min and max temperature may be defined)
No. of grinding stations 2
Type of grinding jars with integrated safety closure devices
Material of grinding tools stainless steel, tungsten carbide, zirconium oxide
Grinding jar sizes 50 ml / 125 ml
Setting of grinding time 00:01:00 to 99:59:59
Interval operation yes, with optional direction reversal
Interval time 00:01:00 to 99:59:59
Pause time 00:01:00 to 99:59:59
Storable SOPs 10
Interface USB / LAN ( RJ45)
Drive 3-phase asynchronous motor with frequency converter
Drive power 2600 W
Electrical supply data different voltages
Power connection 1-phase
Protection code IP 30
Power consumption ~ 3100W (VA)
W x H x D closed 625 x 525 x 645 mm
Net weight ~ 120 kg
Standards CE
Patent / Utility patent Inclined Grinding bowls (US 8,042,754 B2)

Please note:
*depending on feed material and instrument configuration/settings

Function Principle

The new size reduction mechanism of the Emax combines the benefits of different types of mill: controlled circular jar movements (planetary ball mill), intensive friction (vibratory disc mill), and high-frequency impact (mixer mill) allow for unequaled grinding performance. This unique combination is produced by the oval shape and the movement of the grinding jars. The grinding jar supports are fixed on two discs respectively which rotate in the same direction. Consequently, the jars move on a circular path without changing their direction.

The interaction of jar geometry and movement generates strong friction between jar walls, sample material, and grinding balls as well as a quick acceleration which allows the balls to impact with large force on the sample at the rounded corners of the jars. This considerably enhances the mixing of particles, resulting in a narrower particle size distribution and smaller grind sizes than that has been obtained in ball mills so far.

Subject to technical modifications and errors

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