Aluminia is washed and filtered under vacuum.
‘Red mud’ needs to be separated and washed to increase solids content in deep cone thickener tanks.
New Hongda equipment. Supplied via Begg Cousland.
| Model Reference | Number of Discs | Filter Area (m2) |
| HDLP / I | 1 | 10 |
| 2 | 20 | |
| 3 | 30 | |
| HDLP / II | 2 | 40 |
| 3 | 60 | |
| HDLP / III | 3 | 90 |
| 4 | 120 | |
| 5 | 150 | |
| HDLP / IV | 3 | 135 |
| 4 | 180 | |
| 5 | 225 | |
| 6 | 270 |
