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Purification of gypsum

Although the Central PRAYON Process can produce merchant grade calcium sulfate directly from the filter, Prayon also offers clean-up downstream from existing dihydrate plants.

This process involves :

  • classification of the gypsum by removing the fine and coarse particles;
  • washing the gypsum to remove the soluble components (mainly residual phosphate, fluorine, and sodium);
  • filtering and drying the beneficiated dihydrate.


Sales contact

Prayon Technologies (PRT)
144, rue J. Wauters
4480 Engis
Tel: +32 4 273 93 41
Fax: + 32 4 275 09 09
E-mail :


Brochure PRT - Prayon Technologies

Prayon Technologies Brochure


Prayon technologies process with initial dihydrate reaction

Prayon Technologies flyer
on DA-HF process


Operator training simulator for phosphoric acid plant

Operator training simulator for phosphoric acid plant