CGS 10 and CGS 16 Fluidized Bed Jet Mills, for air jet milling of small batches on a laboratory scale.
The particular grinding principle of this jet mill guarantees a virtually contamination-free, ultra-fine grinding of dry products of all hardnesses. Grinding takes place completely autogenously in a fluidized bed so that no grinding tool wear occurs.
The installed, infinitely adjustable classifier wheel guarantees a defined upper particle size limitation of the ground powder. Grinding results can be reproduced by exactly adjustable machine parameters and can be transposed from the laboratory mill onto a larger, production scale machine.
The complete plant is installed on a base frame and is delivered to the customer where it can be put into immediate operation.
The plant is designed to be modular, so that other modules can be added, such as our ConJet® High Density Bed Jet Mill and High-efficiency Classifier Model CFS / HDS to make a completely versatile laboratory platform.
- Finenesses from d97 2.5 µm to d97 70 µm (based on limestone)
- Air jet mill for the ultra-fine grinding of soft to the hardest of materials, in a fluidized bed
- Exactly defined maximum particle sizes through an integrated, dynamic air classifierVortex free fines outlet with expansion chamber to reduce circumferential speed and wear as well as to reduce the buildup of residue
- Classifier wheel with simultaneously rotating immersion tube to achieve highest finenesses, limitlessly adjustable
- Gap between classifier wheel and fines outlet rinsed by gas for highest possible prevention of oversize particles in the product
- Classifier shaft seal rinsed by compressed gas to protect the bearings
- Entirely autogenous grinding - no tool wear - no contamination
- Warming of product prevented by grinding with cooled gas (20°C), therefore applicable for extremely temperature sensitive materials
- Significantly lower compressor capacity as compared to other design jet mills
- Classifier head can be opened 180° for excellent accessibility for fast, easy cleaning and maintenance
- Reproducible results
- Shipped ready for immediate operation
- Can be combined with other machine modules
- Optional designs available: pressure shock resistant, gas tight, wear protected
In the ceramic industry the mechanical treatment of raw materials, processed or finished powders is an important part of many production processes. At the same time the grinding- and classifying processes are also of primordial importance, in order to ensure a range of particle sizes which is usually exactly defined for the particular process. The grinding principle of jet milling has proved itself to be particularly effective for the grinding of ceramic and abrasive materials. They can be ground to high finenesses, with an exact upper particle size limit, in one working step.
Sofraced, the only company in France to manufacture ceramic powders for use in dental prostheses, has decided to diversify its grinding processes. At first glance, this seems simple, but the new process requires a ceramic powder devoid of all traces of other materials, in order to prevent alterations in its color and bio-compatibility. Ceramic is highly abrasive. NETZSCH Trockenmahltechnik GmbH, builder of grinding machines and equipment was asked to assist in finding some good solutions. This was not always easy!
The interest in finer, dry products has led to the development of more efficient jet milling processes. The first part of the paper describes the thermodynamic basic principles for generation and application of steam, and compressed gases. Practical experience has shown that in the aspired fineness range stabilization during grinding provides an enormous potential for improvement. Some selected examples demonstrate that the energy requirement can be reduced by a factor of more than two by suitable choice of stabilizers.