Tailings Dewatering Press

The FLSmidth Tailings Dewatering Press (TDP) is a redesigned belt press filter that overcomes old design shortfalls to produce drier cake at lower costs.

Tailings Dewatering Press
  • TDP Advantages
  • Design Features

Advantages of the Tailings Dewatering Press

  • Low Profile Gravity Drainage Section
  • Vertical S-Roll configuration
  • Elimination of cake re-wetting
  • Dual Filtration
  • Rack and Pinion belt tensioning
  • Lower operating costs


FLSmidth’s experience with belt press equipment dates back to 1979 with its EIMCO® branded belt presses that pioneered the technology. With a long and successful track record in tails management, FLSmidth has taken this proven dewatering technology to the next level.

Maximum cake dryness with vertical S-roll design
Traditional roll patterns run horizontally. This leads to pooling between the rolls resulting in rewetting of the belts. In order to avoid these rewetting issues the TDP has been configured in a vertical S-roll configuration. The belt travels upwards and each roll’s filtrate runs into its own drip tray thus avoiding any pooling or rewetting, this produces a drier cake than the traditional horizontal design.

Increased safety with low profile gravity drainage zone
Safety is at the top of our priorities. With the new TDP design it is no longer required to use a ladder or build expensive platforms for the purpose of inspecting the gravity drainage zone as on traditional designs. This reduces the heights hazard by allowing operators to inspect this area from a standing level.

Optimized roll designs for dual filtration

Perforated bottom roll
Rather than use a solid roll on the first S-roll (S1), we have opted for a perforated roll that allows for dual filtration while avoiding pooling and rewetting. The perforations allow water to be removed through both belts as it drains into the drip tray below.

Chevron grooved roll
Just like tire treads pump water away from the center of the tire on a wet road, the chevron grooved roll pumps water away from the center of the cloth and off the edges to allow for dual filtration on the second roll (S2).

Extended belt life with a rack and pinion
A rack and pinion on both belt take-up ensures there is no misalignment of the belt which will increase belt life.

High cake discharge lowers installation costs
The high cake discharge feature of the TDP lowers installation costs as the filter is placed on ground level and the conveyor if installed on floor level. Traditional designs require that special platforms for the filters and conveyors be built to accommodate the below ground level discharge which increases installation costs. The TDP avoids these capital expenses and subsequently lowers operating costs as all areas of the filter and conveyor are openly accessible for future maintenance.

TDP Filter Press

The TDP design offers several distinct operation zones that are applied based on the changing characteristics of the feed material as it passes through the continuous machine.

  1. Pretreatment zone – inclined solids conditioning zone, flocculation with cationic and anionic flocculants as needed
  2. Feedbox – distributes the feed evenly over the width of the gravity drainage zone. This reduces the potential for sludge extrusion and enhances production and final cake solids
  3. Gravity drainage zone – a 10-ft (3.0 m) inclined section with a changeable number of adjustable corrosion resistant polypropylene “plows” that give an overall best set of conditions for enhanced drainage of the pulp by creating pathways for the liquid to drain through the filter belt. Designing the gravity zone at an operator-friendly height makes it easier to inspect and manage maintenance events, and thus maximizes liquid and solids throughput and system uptime
  4. Wedge zone – provides initial gentle compression for early stages of dewatering of the gravity drained slurry
  5. Pressure zone - “S” wrap section – 6 rolls maximum with decreasing diameter to provide best pressure profile for dewatering the solids prior to discharge. By pulling the belts through the pressure zone vertically, filtrate pooling and cake re-wetting are eliminated. Roll diameters are (1) 610 mm/24 inch, (1) 356 mm/14 inch, (2) 325 mm/12.8 inch, (2) 274 mm/10.8 inch
  6. Perforated first roll - Perforated first roll allows filtrate to drain through both sides of the filter belts. This doubles the filtration area for the first S-roll (S1) where the maximum water drainage occurs in the pressure zone. This enhanced throughput results in drier cakes.
  7. Chevron grooved second roll - the second roll (S2) is chevroned to provide enhanced drainage due to the liquid drainage load.
  8. Drip Pans – eliminate cake rewetting and produces drier cake, “S” wrap pressure section rolls are vertically arranged allowing drip pans to be located beneath each compression roll, preventing re-wetting of the belts and filter cake
  9. Belt Tension System - Automatic belt tensioning permits operatorfree adjustment with separate controls for upper and lower belt adjustments. The “wrap” of the “S” rolls is adjustable to optimize the usage of the shearing effect (that helps dewatering) occurring when the belts and cake pass through the rolls
  10. Belt Aligning System - for both top and bottom belts
  11. Rack & Pinion – true belt alignment
  12. Endless Belts - Filter belts are of continuous woven mono-filament fabrics with reinforced seams. (Optional item: endless belts and filter media solutions are available)

Brochures

Tailings Dewatering Press (TDP) Brochure
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