Page 374 - Chemical Process Equipment - Selection and Design

12.2. CLASSIFICATION WITH STREAMS OF AIR OR WATER 337

20 40 bo ,
%of limiting aperture % of limiting aperture
(a) (b)

% of limiting aperture

(c)
Figure 12.1. Normalized cumulative size distribution curves of comminuted products. (a) From various kinds of crushing equipment. (b)
From rod and ball mills. (c) RRS plots of two curves (Taggart, 1951).

Engineers’ ,Malandbook, McGraw-Hill, New York, 1984, p. 12.2. CLASSIFICATION WITH STREAMS OF AIR
m.
‘41.11.
Entrainment of particles with streams of air or water is particularly
and Spottiswood, Introduction to Mineral ppocessing, 1982, p,
1 n.1 suitable for removal of small particles from mixtures. Complete
1j.J. distribution curves can be development by employing several stages
V.K. Karra, DelrelOpment of a model for predicting the screening operating at suitable conditions in series,
performance of a vibrating screen, CZM Bull. 72, 167-171
(Apr. 1979).
AIR CLASSIFIERS
The last of these procedures is in the form of equations suitable for Although screens of 150 mesh and finer are made, they are fragile
use on a computer. and slow, so that it is often preferable to employ air elutriation to