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The Prayon Dihydrate (DH) Process is widely used by producers due to its reliability, simplicity of operation and the use of proven equipment (Profile).
It consists in the attack of the phosphate rock under dihydrate conditions cooled by a specific flash cooler designed to limit the scaling. The square compartment reactor fitted with Prayon agitators provides the best available conditions on the market in terms of lifetime, maintenance and reaction efficiency.
Dihydrate slurry is filtered on a Prayon tilting pan filter to recover the phosphoric acid. Depending on the rock processed, the ex-filter acid strength is typically 25-29% P2O5 and the typical P2O5 recovery efficiency is 94-95%.