Process Technology for the Rounding of Graphite
Due to its use as a material for anodes in lithium-ion-batteries, graphite is of great importance in the context of electromobility. In order to obtain the high purity required for battery applications, the finely-distributed, so-called flake graphite which occurs naturally in stone, must be processed in various steps.
Spherical graphite (SPG) is ideal for use as a raw material for anodes. Its smooth, small surface prevents flaking and ensures low irreversible capacity loss and long service life. Due to its high tap density, high charging is achieved and consequently energy density is higher.
Efficient Rounding of Graphite with the NETZSCH Process
The NETZSCH business unit Grinding & Dispersing and Dorfner ANZAPLAN have joined forces to find a more efficient solution for graphite rounding to overcome the 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 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.
Plant data for the NETZSCH GyRho System compared to competitors´ systems
30 % higher plant availability
65 % total yield*
* up to 65 % total yield based on amount of raw material and depending on its origin and type
35 % lower operating costs*
* Opportunity-, working-, spare part-, electricity costs, depreciation and costs for graphite concentrate