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Hemihydrate

About

Straight process to produce phosphoric acid with a limited water consumption

The Prayon Hemihydrate (HH) Process is sought for its simplicity and the high P₂O₅ strength in the product acid.

It consists of an attack of the phosphate rock under hemihydrate 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. Hemihydrate 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 40-42% P2O5 and the typical P2O5 recovery efficiency is 92-94%.

Advantages
When should we select Prayon Hemihydrate Process?

Low investment

Flexibility to process all types of phosphate

Sedimentary and igneous

Limited grinding of the rock

High strength phosphoric acid

Recommended
Where should Prayon Hemihydrate Process be applied?

Where low-cost rock is accessible

Where energy cost is high

Steam and electricity

Where gypsum disposal is possible

Where water supply is a challenge

Get in touch with our experts

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