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4

THEPRAYON

FILTER

Over 300 Prayon tilting pan filters have

been sold since the 1950s, and approxi-

mately 250 installed in phosphoric-acid

production units. The rest are used in

other fields such as:

+

Copper, cobalt, zinc and uranium hy-

drometallurgy;

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P

2

O

5

-impregnated active carbonwashing;

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Phosphate washing;

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Acid filtration in general.

MAIN DEVELOPMENTS

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A special compact vacuum box for sepa-

rating gases and the various filtrates;

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A fast-drain filtration cell (pan) which

can increase filter capacity and filtra-

tion yield;

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An automatic system to keep the pans

horizontal;

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A new tilting-track design for higher

rotation speed and filtration capacity;

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Support rollers designed for heavy

loads;

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A robust rotating frame with a replace-

able wear plate;

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A new waterproof cloth-fixing system

meaning that the cloth can be replaced

in a very short time;

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A high filtering surface to base area

ratio.

MAIN BENEFITS

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High level of reliability due to their ro-

bust design; indeed, a number of filters

sold in the 1960s are still in operation;

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On-stream factor of over 95%;

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Excellent capacity / extraction yield

ratio, due to batch filtration and a high

authorised maximum vacuum level;

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Extremely energy-efficient;

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Negligible recycling of the solids re-

covered during cloth washing, meaning

that the cake discharged from Prayon

filters contains very little free water;

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Able to benefit from Prayon’s proven

track record with very large filters (e.g.

30-240 filter with a surface area of

275 m²).