This method of concentration of ore is based on the difference in densities of the metallic
ore and gangue particles powdered ore is treated with a stream of running water
when the lighter gangue particles are washed away and heavier ore particles are
left behind.
Two common methods for Gravity separation are as follows:
(i). Wilfley’s
Table Method: A Wilfley Table used for
the purpose is a slopping table with top corrugated or riffled in the direction
of the slope. The crushed ore is fed on the top of table, which is kept
vibrating all the time. A stream of water is made to flow across the table at
right angles to the slope. At each jerk the lighter gangue particles are thrown
upward and are carried across the table by the stream of water. At the same
time the heavier particles (ore) move towards the bottom of table. A good deal
of separation takes place by the time the ore particles reach the bottom. This
method is particularly suitable for dense eres like cassiterite (SnO2)
and hematite (Fe2O3).
(ii). HydrulicClassifier Method: Hydrulic Classifier is
a conical reservoir fitted with a hopper at the top and a pipe at bottom,
Powered ore is dropped through the hopper and the powerful stream of water is
forced in through the pipe below. Lighter gangue particles are carried force
in, through the pipe below. Lighter gangue particles are carried away by the
current of water and the heavier ore particles collect in the apex of conc. the
conical shape helps in reducing the velocity of water and thus ore particles
are prevented from being carried away by water.
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