ANDRITZ tilting pan filter

Maximum extraction of phosphoric acid with ANDRITZ tilting pan filter

The tilting pan filter has been part of our product range for over 50 years and there are over 300 tilting pan filters installed worldwide. This filter is used primarily in the manufacturing of phosphoric acid from phosphate rock, and specifically in the dihydrate, hemihydrate, and the combined hemihydrate and dihydrate processes.

Large filter sizes, with filter areas in excess of 200 square meters, eliminate the need for multiple smaller filters. The filter offers the facility to discharge the solids as a wet cake or dry cake, and provides exceptional wash efficiencies, in addition to maximum process control. In addition to phosphoric applications, the tilting pan filter has been used in metallurgical applications, such as copper ore, and in specialized applications, such as activated carbon.

ANDRITZ tilting pan filter

ANDRITZ tilting pan filter



  • Unparalleled efficiency (uses less water than other separation technologies with comparable filtration area)
  • Energy-efficient as the connected horsepower can consist of only a single vacuum pump and compact drive
  • Unsurpassed reliability due to robust design
  • High production flexibility thanks to heavy-duty rotating frame mounted on support rollers to accommodate extra heavy loads in times of peak production demand
  • Deep pan depth and horizontal cake orientation for flood washing of solids to extract maximum acid content
  • Precision filter cloth washing ensures that the filter cloth remains unblinded for the maximum length of time
  • Easy maintenance requiring only brief training




  • Phosphoric acid

Mining & Minerals

  • Phosphate rock de-sliming
  • Potash
  • Jarosite
  • Activated carbon
  • Copper
  • Cobalt
  • Zinc
  • Uranium

New developments

  • Fast-drain™ cell vessels allow for higher filtration rates than conventional slope-bottom cell vessels
  • EX-LV vacuum box has built-in pre-separation of filtrate liquid and gas for lowest pressure drop and minimum scale build-up
  • Vacuum box chambers are designed with flow areas and baffles so that the incoming filtrate liquids and gases are separated
  • Immediate access EX-LV vacuum box allows for easy removal of scale build-up and quick adjustment of vacuum box partitions
  • EX-LV vacuum boxes have a hydraulic lift which enables inspection, cleaning and adjustment of the vacuum box internals, without having to remove vacuum piping
  • Optional three-point hydraulic drive system keeps car-frame concentric with vacuum box, without additional centering casters which wear over time
  • Rotating frame with bolt-on replaceable wear track which rides on support rollers

ANDRITZ tilting pan filters – unsurpassed reliability

Add intelligence to your tilting pan filter and upstream dihydrate reactor

Metris addIQ ACE for tilting pan filters (ACE = Advanced Control Expert) is a control optimization system that uses a series of Metris BrainWave MPCs (Model Predictive Controller) to determine the best setpoints. It manages the key process control loops, keeping costs as low as possible while continuously delivering a product that meets your specifications.

Furthermore, it manages all operating constraints and limits and sends operational targets to the plant’s automation system (DCS). Metris addIQ ACE continuously advises the operator on what is happening and why, also giving the operator an insight into how it analyzes and guides the process. With this customized solution, production is maximized while simultaneously minimizing the loss of phosphoric acid to tailings. It optimizes operation of the ANDRITZ tilting pan filter to maximize the concentration of the phosphoric acid product while minimizing loss of phosphoric acid in the gypsum by-product.

It also optimizes reactor operation by controlling temperature and level, as well as dynamically controlling residual sulphates during the reaction. The Metris Digital Twin of the process provides real-time feedback on key reactor values that would otherwise come from periodic lab samples. This allows Metris addIQ ACE to make continuous adjustments and tighten reactor control. The Metris addIQ ACE modules include control of reactor temperature and level, residual sulphate, reactor solids and density of filter tailings wash filtrate.

Benefits of Metris addIQ ACE for tilting pan filter:

  • Maximized production rate
  • Maximized recovery of water-soluble phosphoric acid
  • Minimized scaling by accurate control of feed slurry temperature

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