Applications
The capacity varies considerably depending on metallurgical criteria. Most important variables are magnetic susceptibility characteristics of the magnetic particles, degree of liberation and size of the feed.
Mechanical features of the separator as tank design, magnet system and drum diameter do of course also effect the capacity. The following capacity figures can be used as guide-lines for STL magnetic wet separators in iron ore processing.
| Fineness | %minus 0.074mm (200 mesh) | Type of tank | Dry solids feed rate ton/h X m drum length | Volumetric feed rate m3/h X m drum length | ||
| Dia 916mm | Dia 1200mm | Dia 916mm | Dia 1200mm | |||
| Coarse | 15-25 | Concurrent | 70-90 | 120-160 | 140-200 | 240-350 |
| Medium | 50 | Concurrent Counterrotation |
35-50 | 60-100 | 80-120 | 130-220 |
| Fine | 75-95 | Countercurrent | 30-50 | 60-100 | 80-140 | 150-250 |
Above Figures applicable for iron ore processing.
As summary of the field experience and confirmed by test runs, following advantages can be emphasized when using the dia. 1200Mm separators specially for new projects:
- Reducing the total number of separators required.
- Lower operation and maintenance costs.
- Less number of pumps, pulp distributors, etc
- Less occupied floor space.
- Lower building cost.
For applications involving fine or very fine particles, low content of magnetic material, and/or where highest recovery is desired, the HG- type magnetic assembly has been found to be superior to the standard assembly. The diagram to the right is an example on recovery of magnetite from floatation tailing s in true comparison with standard magnetic assembly.
The DMHG unit is designed to give a higher gradient than the standard assembly. The magnetic field strength is, however, lower. Thus the capacity measured as t/h x m drum length is down rated to correspond to the lower field rating.
The natural place for this separator is e.g. On a tailing s stream from a magnetite plant, secondary separator in a dense media recovery circuit, or recovery of metal powder production.
| Model series | Drum Diameter (mm) | Volume capacity m3/h X m drum length |
| STWS 900 DM STWS 900 DMHG |
916 916 |
60-70 50-70 |
| STWS 1200 DM STWS 1200 DMHG |
1200 1200 |
100-120 80-100 |
The above volume capacities are indicative for optimum performance at average conditions. Higher volumes can be allowed under special conditions.