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18

WWW.PRAYON.COM

PRAYONTECHNOLOGIES

PROCESSESWITHINITIAL

HEMIHYDRATEREACTION

As energy costs weigh increasingly heavily, it may be worth producing a more highly concentrated

acid directly from the filter, provided this is permitted by the water balance.

To fulfil this requirement, as well as that

of producing a self-drying hemihydrate,

Prayon has developed the PH3 process.

This is a three-crystal process that yields

a high P

2

O

5

acid and a phosphogypsum

that can be used as a base for construc-

tion materials. Once this process had been

developed, we felt it could be simplified

by deleting stages to fit to certain client

requirements. This led to the develop-

ment of two further hemihydrate pro-

cesses.

To achieve a successful engineering pack-

age for high-strength processes, Prayon

was able to rely on both:

hardware

: many years of experience in

the operation and engineering of equip-

ment (reaction tank, agitators, cooling

equipment, filters...)

software

: our expertise with multicrystal

process operation, our in-depth knowledge

of phosphate behaviour and the ability to

design successful industrial units based

on pilot-plant data.

THREE-CRYSTAL PROCESS OR PH3 [ PRAYON HEMIHYDRATE 3-CRYSTAL ]

Phosphate

Flash

Cooler

Steam

Water

Phosphoric Acid

40 to 46% P

2

O

5

Pure Calcium

Sulphate

Hemihydrate

H

2

SO

4

Reaction

Recycled Acid

Digestion

DIHYDRATE

HEMIHYDRATE

HEMIHYDRATE

Vacuum

Vacuum

Separation filter

Dehydration tanks

Hemihydrate

Filter

Vacuum

Flash

Cooler

Optional

Flash Cooler

Hydratation tanks

Seal tanks