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PRAYON PROCESSES

PRAYON TECHNOLOGIES: THE REFERENCE IN THE PHOSPHORIC ACID WORLD

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THE CHARACTERISTICS OF PRAYON TECHNOLOGIES

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A process for each situation ..................................................................................................................................................................................... 06

Production-oriented ............................................................................................................................................................................................................. 06

Flexibility .......................................................................................................................................................................................................................... 06

Efficiency ........................................................................................................................................................................................................................... 06

World wide references ................................................................................................................................................................................................. 06

CALCIUM SULPHATE CRYSTALLISATION PHASES

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PRAYON TECHNOLOGIES PROCESSES

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First range: process with the first reaction as “dihydrate” ............................................................................................................................. 08

Second range: process with the first reaction as “hemihydrate” .......................................................................................... 08

FEATURES OF PRAYON TECHNOLOGIES DESIGN

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Reactor design .................................................................................................................................................................................... 10

Sulphate gradient of the slurry in the attack tank ......................................................................................................................... 10

Low Level Flash Cooler (LLFC) ........................................................................................................................................................... 11

Agitators ............................................................................................................................................................................................... 12

Filters ................................................................................................................................................................................................................................ 13

PRAYON TECHNOLOGIES PROCESSES WITH INITIAL DIHYDRATE REACTION

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The Mark 4 Dihydrate Prayon Process (DPP) .................................................................................................................................. 14

The Central Prayon Process ............................................................................................................................................................. 15

The two-crystal process (DA-HF) .................................................................................................................................................... 16

Very adapted to DH revamping......................................................................................................................................................... 17

PRAYON TECHNOLOGIES PROCESSES WITH INITIAL HEMIHYDRATE REACTION

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Three-crystal process or PH3 (Prayon Hemihydrate 3-crystal) .................................................................................................... 19

Two-crystal process or PH2 (Prayon Hemihydrate 2-crystal) ....................................................................................................... 20

One-crystal process or PH1 (Prayon Hemihydrate 1-crystal) ....................................................................................................... 21

PRAYON RELATED TECHNOLOGIES

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