Background Image
Previous Page  12 / 24 Next Page
Show Menu
Previous Page 12 / 24 Next Page
Page Background




Agitation is a key factor in chemical pro-

cesses as it improves the mass transfer of

the reagent and crystallisation conditions

in the reaction slurry.

During the reaction period of phosphoric

acid production, agitation is used for the

following purposes:


To keep the solids suspended.


To renew the liquid layer (reagent) on

the phosphate grains.


To break the foam on the surface of

the reactor.

To be economical this process needs to

be performed with as low a power con-

sumption as possible. PRAYON TECH-

NOLOGIES has developed a special type

of agitator to fulfil these requirements.

The bottom blade is a helicoidal shape

to ensure a high pumping rate. It keeps

solids suspended and the compartment

clean. The middle blade is a pitched blade

with a pumping effect. It also generates

shear, which improves the mass transfer

and the incorporation of the reagents.

The top blade is a vertical turbine blade

with an antifoaming effect (achieved by

splashing liquid on the reactor surface)

and helps incorporate reactants fed to

the surface of the reactor.

In the digestion section, strong agitation

is no longer necessary. Only helicoidal

blades with low specific power consump-

tion are used.

For a few years now, PRAYON TECH-

NOLOGIES has been using a Computer-

ized Fluid Dynamics software in order to

further improve the design of its agitators.