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7

PRAYON PROCESSES

CALCIUM

SULPHATE

CRYSTALLISATION

PHASES

The main reaction of phosphate

rock with sulphuric acid produces

phosphoric acid and calcium sulphate.

Depending upon the physical and

chemical conditions of the reaction, the

calcium sulphate may take the form of

dihydrate,

α

-hemihydrate or anhydrite.

10

0

0

40

60

80

100

120

20

20

30

40

50

60

80

Température - °C

Weight percent P

2

O

5

in the acid

HEMIHYDRATE ZONE

DIHYDRATE ZONE