(57) A small hydrocyclone (maximum vortex chamber diameter in the range 7 to 14 mm), particularly
for use in separating starch from a starch-containing feedstock, has a feed passage
(7) leading via a volute (8) into the vortex chamber (3, 4) of the hydrocyclone. The
feed passage (7) is formed so that Its hydraulic radius (i.e. the ratio of the cross-sectional
area of the feed passage to the peripheral extent of the cross-section) is in the
range 5.7 to 6.5% of the diameter of the vortex chamber. By this means the feed energy
requirements of the hydrocyclone for achieving a given separating efficiency are reduced.
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