The graphite rounding process developed by NETZSCH overcomes disadvantages of the previously widespread used process requiring more than 20 classifier mills installed in rows: In a first step, the flock graphite is pre-ground to the optimum initial particle size for spheroidization in a classifier mill or fluidized bed jet mill.
The actual particle rounding process takes place directly downstream in the newly designed NETZSCH GyRho Rounding Unit (Fig. 2) which is available in various construction sizes and can be specially designed to suit the necessary output quantity. For larger throughput volumes two (or more) machines can be operated simultaneously and can replace the train of 20 machines or more as mentioned above.