Comex Group – Norway/Poland has developed a new grinding system employing a ball mill working with an air classifier in the closed circuit, for a laboratory use. The equipment is very compact, requires small amount of input material and the operating system provides fully automatic test procedures with registration of all operating parameters in the control unit. The process capacity is typically in the range of few kg per hour, which provides a significant flexibility regarding test work with small material portions, different settings and operating parameters. The system can also simulate conditions in large grinding mills by setting a required process temperature up to 150 deg. C. It also possible to operate the system as an air classifier to separate the fine and the coarse fractions as an independent test work. In addition, it can operate in an inert atmosphere like nitrogen, to test unstable or explosive materials. Finally, the particle size distribution can be measured at the outlet by the on-line analyser providing constant control of the produced particles. All parameters are registered in the system and can be exported to XL after testing. The grinding and the classification system can be very useful for high precision laboratory tests to simulate the large industrial operations, where any long-term test work is very limited. Typical application areas include production of cement, industrial minerals, ceramics, chemicals, etc.