Upgraded rock - Ecophos

Prayon has the widest experience available on the market in processing high-impurity phosphate rocks.

Depending on the type and quantity of impurities, traditional phosphoric acid processes can meet the following issues with low-grade rocks :

• Filtration affected by the high viscosity
• Formation of gel at the concentration stage
• Post precipitation and scaling

Therefore, Ecophos as part of Prayon Technologies developed the unique “Ecophos” process to recover P₂O₅ from low-grade phosphate rocks by adding diluted hydrochloric acid. HCl specific consumption can be reduced by addition of sulfuric acid in a final module to recycle HCl and generate a pure gypsum. This process provides an outstanding raw material for any phosphoric acid plant: the DCP “super-rock”.

Ecophos is a chemical beneficiation process with a recovery efficiency far above any traditional beneficiation plant (up to 90%). It produces a DCP “super-rock” of high quality (up to 41% P₂O₅) leading to the following benefits using it as raw material instead of phosphate rock.