Retsch BB 200 User Manual download pdf (Page 15)

04/05/2012 Retsch GmbH 15

Working instructions

Target group: Laboratory technicians

General

The BB 200 is a rugged, floor-mounted unit which is used

primarily for preliminary grinding in preparation for final size

reduction.

Its continuous operating concept also makes the BB 200

suitable for integration into fully automatic and semi-automatic

processing lines.

The performance data, throughput rates and ultimate fineness

which can be reached will depend on the breaking properties

and hardness of the product and on the gap width which is

selected.

Grain size of feedstock product

The maximum grain size is determined by the size of the fill

hopper opening and in the BB 200 is a maximum of 90 mm.

Properties of the product being ground

Every hard and brittle product, exhibiting a hardness of greater

than 3 on the Mohs scale, can as a rule be reduced with the BB

200.

Wet and oily product and that with a hardness index below 3

(Mohs scale) tend to be compressed and clump in the grinding

chamber, this being due to the pressure exerted by the breaker

jaws. It is for this reason that pre-grinding such material is

hardly possible.

Fill volume

If the grinding chamber W is filled more than 2/3=800ml full,

then the guide plates of the fill hopper could be damaged and the

moving breaker would force the product into the crusher

housing, behind the breaker arm. Fig. 6

The fill level will also influence the proportion of fine material in

the product or specimen after preliminary grinding; the fuller the

grinding chamber, the greater the share of fines.

Fig. 6

If the grinding chamber W is filled more than 2/3=800ml full,

then the fill hopper guide plates could be damaged; the moving

breaker arm would force product into the crusher housing,

behind the breaker arm.

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 23 24

No comments

Retsch BB 200 User Manual Page 15