Table 1 Code and level of factors chosen for the trials
Factor | Levels | ||
|---|---|---|---|
− 1 | 0 | 1 | |
Ball-to-material ratio (g/g) | 10:1 | 18:1 | 26:1 |
Milling time (min) | 10 | 30 | 50 |
Milling speed (rpm) | 100 | 300 | 500 |
Extraction pH | 4.0 | 5.5 | 7.0 |
Factor | Levels | ||
|---|---|---|---|
− 1 | 0 | 1 | |
Ball-to-material ratio (g/g) | 10:1 | 18:1 | 26:1 |
Milling time (min) | 10 | 30 | 50 |
Milling speed (rpm) | 100 | 300 | 500 |
Extraction pH | 4.0 | 5.5 | 7.0 |