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Industrial companies consider Prayon’s tilting pan filter a highly reliable and efficient tool to produce phosphoric acid.

PROFILE has also developed a new belt filter.

The Prayon filter

Over 300 Prayon tilting pan filters have been sold since the 1950s, and approximately 250 installed in phosphoric-acid production units. The rest are used in other fields such as:

  • Copper, cobalt, zinc and uranium hydrometallurgy;
  • P2O5-impregnated active carbon washing;
  • Phosphate washing;
  • Acid filtration in general.

The Prayon filter

Main developments

  • A special compact vacuum box for separating gases and the various filtrates;
  • A fast-drain filtration cell (pan) which can increase filter capacity and filtration yield;
  • An automatic system to keep the pans horizontal;
  • A new tilting-track design for higher rotation speed and filtration capacity;
  • Support rollers designed for heavy loads;
  • A robust rotating frame with a replaceable wear plate;
  • A new waterproof cloth-fixing system meaning that the cloth can be replaced in a very short time;
  • A high filtering surface to base area ratio.

Main benefits

  • High level of reliability due to their robust design; indeed, a number of filters sold in the 1960s are still in operation;
  • On-stream factor of over 95%;
  • Excellent capacity / extraction yield ratio, due to batch filtration and a high authorised maximum vacuum level;
  • Extremely energy-efficient;
  • Negligible recycling of the solids recovered during cloth washing, meaning that the cake discharged from Prayon filters contains very little free water;
  • Able to benefit from Prayon’s proven track record with very large filters (e.g. 30-240 filter with a surface area of 275 m²).

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