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- Prayon - Model DA-HF - Phosphoric Acid
Prayon - Model DA-HF -Phosphoric Acid
Cutting-edge process to produce phosphoric acid with a high recovery efficiency. The Prayon DA-HF Process is a modern process developed and industrially implemented by Prayon. It is an economic and efficient solution to produce phosphoric acid and valuable gypsum as a co-product. It consists in the attack of the phosphate rock under dihydrate conditions. Then, the gypsum slurry is converted to hemihydrate by the addition of sulfuric acid and steam in a specific circular reactor designed by Prayon. Hemihydrate slurry is filtered on a Prayon tilting pan filter to recover a good-quality calcium sulfate. Depending on the rock processed, the ex-filter acid strength is typically 32-34% P2O5 and the typical P2O5 recovery efficiency is 97%.
When should we select Prayon DA-HF Process?
- Low investment cost
- Especially considering the revamping of an existing Dihydrate plant
- High P2O5 recovery
- Low P2O5 content in the phosphogypsum
- Suitable for cement and building applications
- Self-drying phosphogypsum
- With a final moisture around 10-12%
- Limited grinding of the rock
- Low cadmium in the product acid
When should Prayon DA-HF Process be applied?
- Where medium- to high-cost rock is accessible
- Where energy cost is rather high
- Steam and electricity
- Where gypsum disposal is limited and/or where a potential market for gypsum has been identified
- Cement or building applications
- To increase production capacity by minimum 20%
- With limited changes in an existing Dihydrate plant