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14

WWW.PRAYON.COM

PRAYONTECHNOLOGIES

PROCESSESWITHINITIAL

DIHYDRATEREACTION

THE MARK 4 DIHYDRATE PRAYON

PROCESS (DPP)

This process has undergone major in-

novation every ten years or so, up to the

achievement of the highly efficient Mark

4 version, which is a favourite with pro-

ducers due to its reliability, simplicity of

operation and the use of tried-and-tested

equipment.

THE MAIN CHARACTERISTICS OF

THE PROCESS ARE

+

low investment and running costs

+

the ability to process all types of phos-

phates (sedimentary and igneous)

+

accepts phosphate slurry feeding (wet

grinding)

+

water balance is easy to control (recy-

cling of pond water, reduction and/or

elimination of liquid effluent)

+

dihydrate route

+

good P

2

O

5

recovery

RECOMMENDED FOR LOCATIONS

+

with low to medium cost rock

+

with low-cost energy (steam)

+

with gypsum disposal possibility

Phosphate

Flash Cooler

Filter

Water

Phosphoric Acid 28 to 30% P

2

O

5

Calcium

Sulphate

Dihydrate

H

2

SO

4

Reaction

Recycled Acid

Digestion

DIHYDRATE

Vacuum