Table 5 Chemical composition of the kish graphite after purification with HCl by using physical auxiliary methods
Composition | Physical auxiliary method | |||
|---|---|---|---|---|
None (ambient, 60 min) | Heating (80 °C, 30 min) | Microwave irradiation (40 °C, 30 min) | Ultrasonication (75% amplitude, 5 min) | |
Carbon content (wt%) | 95.59 | 97.06 | 96.15 | 93.95 |
Na (mg kg−1) | 10,720 | 187 | 67 | 412 |
K (mg kg−1) | 3876 | 322 | 1226 | 962 |
Mg (mg kg−1) | 811 | 373 | 347 | 533 |
Ca (mg kg−1) | 798 | 233 | 77 | 420 |
Al (mg kg−1) | 10,720 | 3100 | 2773 | 3400 |
Si (mg kg−1) | 1801 | 2021 | 1720 | 2066 |
Fe (mg kg−1) | 19,880 | 7787 | 18,470 | 19,020 |
Ti (mg kg−1) | 419 | 500 | 480 | 567 |