In this study, five influencing parameters (milling rotational speed; milling time; ratio of grinding ball to material (defined as RGM); ratio of grinding balls (defined as RGB); and grinding ball type) concerning milling process and three influencing parameters (initial CIP concentration; pH value; and co-existing inorganic ions) concerning CIP solutions were studied. Variable-controlling approach was employed and the detailed parameters were set up as shown in Table 1.
Batch experiments setup
| Number . | Parameters . | Experimental conditions . |
|---|---|---|
| 1 | milling rotational speed | 100 rpm, 200 rpm, 300 rpm, 400 rpm, 500 rpm |
| 2 | milling time | 0 min, 5 min, 10 min, 15 min, 20 min, 30 min, 40 min, 60 min |
| 3 | ratio of grinding ball to material (RGM) | 1:1, 2:1, 3:1, 4:1 , 5:1 |
| 4 | ratio of grinding balls (RGB) | 3:0, 2:1, 1:2, 0:3 |
| 5 | grinding ball type | agate ball, ceramic ball, steel ball, zirconia ball |
| 6 | initial CIP concentration | 20 mg/L, 50 mg/L, 100 mg/L, 150 mg/L, 200 mg/L |
| 7 | pH value | 3, 5, 7, 9, 11 |
| 8 | co-existing inorganic ions | HCO3−, Cl−, SO42−, NO3− |
| Number . | Parameters . | Experimental conditions . |
|---|---|---|
| 1 | milling rotational speed | 100 rpm, 200 rpm, 300 rpm, 400 rpm, 500 rpm |
| 2 | milling time | 0 min, 5 min, 10 min, 15 min, 20 min, 30 min, 40 min, 60 min |
| 3 | ratio of grinding ball to material (RGM) | 1:1, 2:1, 3:1, 4:1 , 5:1 |
| 4 | ratio of grinding balls (RGB) | 3:0, 2:1, 1:2, 0:3 |
| 5 | grinding ball type | agate ball, ceramic ball, steel ball, zirconia ball |
| 6 | initial CIP concentration | 20 mg/L, 50 mg/L, 100 mg/L, 150 mg/L, 200 mg/L |
| 7 | pH value | 3, 5, 7, 9, 11 |
| 8 | co-existing inorganic ions | HCO3−, Cl−, SO42−, NO3− |