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" " Special Applications

For any slurry pump application, a complete description of the mixture
components is required in order to select the correct type of pump and
materials of construction.

Weight of dry solids
CW =
Weight of dry solids + Weight of liquid phase

Volume of dry solids
C v ~-~
Volume of dry solids + Volume of liquid phase

A nomograph for the relationship of concentration to specific gravity of
dry solids in water is shown in Figure 8.6.
Slurry flow requirements can be determined from the following
expression.

4 x dry solids (in tons per hour)
Qm -"
C w x S m

where Qm = slurry flow in USGPM
1 ton = 2,00011bs

Example: 2,400 tons of dry solids are processed in 24 hours in water
with a specific gravity of 1.0, and the concentration of solids by weight
is 30% with the solids having a specific gravity of 2.7 then the following
will apply.

2.7 x 1.0
Sm = = 1.23
2.7 + 0.3 (1.0- 2.7)

4 x 100
Qm = = 1,084 USGPM
0.3 x 1.23

8.1.8 Abrasive wear
Wear increases rapidly when the particle hardness exceeds that of the
metal surfaces being abraded. Always select metals with a higher relative
hardness to that of the particle hardness. There is little to be gained by
increasing the hardness of the metal unless it can be made to exceed
that of the particles. The effective abrasion resistance of any metal will
depend on the position on the Mohs or Knoop hardness scale.

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