Densizzer
Densizer - Sharp classifications by size or density
Flat Bottom - For removal of organics (Lites Out configuration), restricted head room or difficult to flow materials.
Characteristics of Densizer Applications
- Application requires a sharp separation.
- Classification range (for 2.7 sg material) is 20 to 200 mesh.
- Customer wishes to separate two materials of different specific gravities.
Theory of Operation
- Feed enters the unit at 35 to 65% w/w
- Water is injected to produce a rising current
- The interaction of particles with the rising current forms a dense “teetered” bed of solids.
Teetering Bed in a Densizer
Theory of Operation
- 4. Particles with hindered settling velocities less than the rising current (e.g. lighter gravity or finer sizes) rise to the top and are discharged over the weir.
- 5. Coarser and heavier gravity particles are discharged through a pinch valve.
Sizing Up the Situation
Sizing Up the Situation
Sizing Up the Situation
Rules of Thumb
For size classification at 30 mesh, 3 to 3.5 TPH of dry solids per square foot.
The smaller the cut size, the more area required for any given tonnage. A 140 mesh cut could be limited to 1 to 1.5 TPH per square foot.
Separation of two minerals by gravity works best when the specific gravties differ by at least 0.7.
Fitting the Densizer into the Plant
- Feed solids concentration must be 35 to 65% w/w
- Teeter Water does not need to be clean
- Underflow ranges from 65 to 80% solids by weight
- Installations are commonly 30’ to 40’ tall
Advantages
- High Capacity: Relatively small floor space for effecting sharp 20 to 200 mesh cuts.
- Low Maintenance: Low internal velocities minimize wear
- Online Control of Separation: Operator can change product to satisfy new specifications by simply keying in a new setpoint.
- Classification is Automatically Maintained: Operator is guaranteed product consistency.