HCl-based Technology: Ecophos Process

The Ecophos process aims to produce high-quality phosphate using any kind of phosphate rocks including low-grade.  This technology is modular and different modules can be applied depending on the quality of the raw-material and final products.


  • Use of low grade to high grade phosphate rock
  • Flexible products based on DCP intermediate (animal feed, fertilizer)
  • Flexible capacity
  • Use of HCl waste stream
  • Option to recycle HCl for rock digestion
  • Pure gypsum produced


  • Where low grade rock is available
  • Where gypsum disposal is not possible
  • Where HCl is available (or H2SO4 if HCl not available)

Shema Hcl Based Technology Ecophos Process

Usine Prayon Prt

The product

The product on top of being a valuable product, DCP is an intermediate for various processes, as it can be converted to various phosphate products such as: phosphoric acid, monocalcium phosphate (MCP), NPK’s…


The first module is Module 1A where the phosphate rock is selectively digested in diluted hydrochloric acid (HCl). This reaction produces a slurry of undigested phosphate rock as a solid with phosphate and calcium chloride (CaCl2) in solution. In Module 1B, the phosphate solution is treated with CaCO3 to obtain dicalcium phosphate dihydrate (CaHPO4.2H2O, DCP) crystals and CaCl2 in the liquid phase.In Module CCP, the CaCl2 solution is purified. In Module 4, CaCl2 is converted back to HCl by reaction with sulfuric acid After filtration, the HCl is returned to the rock digestion module, with a co-product of very pure and white gypsum.

In Module PA, which is the phosphoric acid production process, one of Prayon’s phosphoric acid technologies is applied to DCP to produce high quality phosphoric acid.

Interested ? Please contact

Jennifer Demeyere

Jennifer Demeyere
Business Development Manager