| ROTASPIRAL
FINE SCREENING AND SIZE CLASSIFICATION DOWN TO 75 MICRONS
The CX-PSS Rotaspiral Screen (RS) is an evolution for a conventional drum screen system that removes wood fibre, trash, and oversize particles from slurried, processed ores down to 75 microns. It has been employed successfully in the following applications:
- Carbon Safety Screen – at the end of a CIP/CIL circuit
- Loaded Carbon Screen – prior to the elution columns
- Carbon Dewatering Screen – prior to the elution columns
- Trash Reject Screen – prior to leach or flotation circuit
- Safety Screen – prior to thickeners or other equipment needing trash protection
- Sizing Screen – to classify particles into over/undersize down to 75 microns
Unique Features
| 100% stainless steel slotted wire mesh
| No rollers or cloth tracking system
| Dewatered oversize discharge
| Use of light-weight rollers
| Low absorbed energy consumption
| Low maintenance intensity
| Competitive capital costs
CX-PSS Rotaspiral Screen (RS) Design
The screen uses a tensioned stainless steel slotted wire mesh that is wrapped around a drum. Supported by four steel hardened wheels, the drum rotates to present screen area to the incoming slurry feed. Inside the drum, an integrated stainless steel helical-shaped spiral moves the oversize particles out of the drum and into the oversize chute. Material that is small enough to pass through the wire mesh feed via gravity into the underflow chute.
Main Frame – is a completely welded construction of pressed U-sections and angles in mild steel. The under and oversize chutes are bolted to the main frame and are fabricated in 3 mm rubber-lined mild steel plates.
Drum – is fabricated completely in 304 stainless steel, with a design to allow quick and easy changing of the mesh panels attached to it. The internal spirals transport the oversize into the was and discharge zone of the unit.
Steel Mesh – the plain weave slotted steel mesh has a much higher open area than polyester screen cloths. This allows up to double the drainage rate of plastic meshes with the same aperture.
Screen Wash Sprays – As the drum rotates, the mesh panels pass through two spray wash zones with oscillating spray bars. This ensures discharge of oversize and limits blinding or scale build up in the mesh.
CX-PSS RS Uniqueness
The CX-PSS RS has proven efficient as a replacement to conventional linear screens in trash removal applications. At many operations, the RS has been installed to improve screening performance, or to increase overall plant availability.
In a specific case, recently commissioned, a single RS unit was installed to replace two conventional linear screens. While maintaining full feed (300 tph), the RS could recover 50% w/w more trash from the pre-leach circuit, while reducing the footprint, energy consumption and maintenance consumables by 75%.
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