Center of expertise - Cold grinding & recycling
Cold grinding & recycling at the highest level
Only as powder many materials really get in shape and can be used efficiently. Cold grinding and recycling with N2 and CO2 can solve many problems of the crushing process.
Messer operates a highly-specialised technical center for cold grinding in Willich, Germany. Its technology features a special counterrotating peg mill and a tumble screen which allow very fine grain sizes to be achieved when grinding with liquid nitrogen – something that is not possible with conventional procedures. The extremely low temperature of the nitrogen makes it much easier to crush, say, thermoplastic materials in the mill. This also prevents agglutination.
The precisely measured and evaluated results from Willich can be transferred to industrial procedures. Plus the layout of the plant is the same as that of a production plant and can therefore be used as a reference. Fine grinding of synthetic materials or natural products, such as spices, is an art which the Messer Group has mastered. Messer therefore has a technical center for cryogenic grinding in Germany that is open to customers of all the subsidiaries for the purposes of carrying out tests.
Cold grinding and recycling with Messer
Many materials are easier to use and much more effective in a powder form.
However, it is often the case that they cannot easily be powdered due to their physical properties. These properties include the tendency to melt, sensitivity to changes in temperature and showing tough or elastic properties. This often occurs with plastics, natural rubbers, elastomers, pharmaceuticals and spices.
Cold grinding solves these problems
The cold grinding process involves cooling and embritteling of materials with extremely cold liquid nitrogen or carbon dioxide. The process results in production of fine particles with a high level of quality. In addition, process volumes increase significantly. During the grinding process heat sensitive materials are cooled with cryogenic gases in order to protect them from increases in temperature resulting from the heat generated by the process. This means that it is impossible for the powdered material to melt or become sticky.
The Messer Group’s cold grinding and recycling lab offer the customer tailor made solutions including production cost estimates and pilot trials
We offer a highly specialised materials trial process. We are able to carry out sample cold grindings. The final working parameters, including process volumes, power and nitrogen requirements and the resulting particle size distribution are then measured, evaluated and made available to the customer.
Cryogenic grinding technology enables the separation of composite materials into their pure components
The application of cryogenic grinding allows composite materials such as fibre-reinforced thermoplastics, tin cans with product remains such as paint and lacquer adherences, galvanised plastic parts (e.g. sanitary facilities) or old tyres to be separated into their pure components. The success of the process is due to the different linear extension coefficients and embritteling abilities of the materials.
Advantages at a glance:
Higher process volumes
Higher volumes of a finer product
Lower energy consumption
No melting or sticking of temperature sensitive plastics
Set grinding temperatures prevent heat damage
No loss of aromatic materials during the grinding of spices
Greater protection against dust explosion