You are here | Our activities - Equipments - Filtration


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).

Latest Newsrss

Prayon acquires part of Ecophos assets

The company Prayon has acquired the intellectual property including patents portfolio and process...

Read the news All news


144, rue J. Wauters
4480 Engis
Tel: + 32 4 273 96 52
Fax: + 32 4 275 62 06
E-mail :

brochure Profile

Download Profile brochure