Fig. 1. Scanning electron micrograph of flaky graphite samples from Jixi

Fig. 2. Experimental system of arc plasma torch purification graphite

Fig. 3. Physical image of experimental setup

Fig. 4. Structure of arc plasma torch electrode

Fig. 5. Voltage-current characteristics of argon arc plasma torch

Fig. 6. Photos of arc plasma torch at different gas flowrate

Fig. 7. Temperature distribution of arc plasma torch

Fig. 8. Diagram of the voltage-current characteristic of arc plasma torch after adding the graphite sample

Fig. 9. Arc plasma torch’s maximum temperature varies with the current

Fig. 10. Changes of arc plasma before and after adding graphite

Fig. 11. Graphite purity by outer shipping at 5 g/min of delivery speed

Fig. 12. Graphite purity by outer shipping at 10 g/min of delivery speed

Fig. 13. Graphite purity by outer shipping at 15 g/min of delivery speed

Fig. 14. Photo of graphite sample after purification

Fig. 15. Photo of graphite ash after calcination