Retsch AS 200 control - natural frequency Manuel d'utilisateur télécharger pdf (Page 20)

Retsch GmbH 20

Wet sieving

In most cases dry sieving is possible. However,

with some materials the adhesive forces between

individual particles can cause difficulty. These

problems can be overcome by adding a liquid,

preferably water, during the sieving process (if the

accessories mentioned in the section on sieving

aids are not successful). However, wet sieving is

possible only if the materials to be sieved do not

swell, dissolve or change in any other way in the

sieving liquid.

Required accesories

Clamping cover with spraying nozzle for the

corresponding sieve diameter.

Intermediate rings with vent holes.

Collecting bottom container with water outlets for

the corresponding sieve diameter.

Preparation

Position your AS 200 control near to a water

outlet point.

Connect the spraying nozzle of the clamping

cover to a tap by means of a hose.

Connect the outlet of the collecting bottom

container to the water outlet point or a suitable

collecting vessel.

Procedure

Use the intermediate rings with vents.

Add the solid material as a suspension.

Adjust the pressure of the added liquid (water)

only to the extent that the sieving surface is

completely sprayed.

It is advisable to use a dispersing agent. This

reduces the surface tension of the sieving liquid.

If it is difficult to form a slurry with the material

or to obtain exact separation, the individual

fractions should be sprayed one after the other.

After the sieving process the fractions are

transferred from the individual sieves to a

suitable filter (e.g. filter paper) and dried in a

drying oven at 80°C.

The sieves are then cleaned in an ultrasonic bath

and also dried in a drying oven (without the

seals).

Do not exceed the maximum drying temperature

of 80°C.

Never operate your AS 200 control directly in water.

Danger through current surge.

During wet sieving always operate your AS 200 control

connected to a mains socket protected by an FI

protective (safety) switch.

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Retsch AS 200 control - natural frequency Manuel d'utilisateur Page 20

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