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Technical Note A new approach to the nominal
rotation frequency and capacity of roll and drum separators
Roll or drum separators are used in mineral processing especially for
magnetic or electrostatic separation. Industrial and laboratory experience
has shown that the separation efficiency depends on the size of the rotating
cylinder, the particle size, the field strength, the susceptibility of the
material, the rotation frequency and the feed rate. The rotation frequency
and the feed rate are usually controlled empirically in order to obtain best
separation efficiency at the maximum possible capacity.
Given the number of parameters involved in determining the optimum
capacity the question is, whether there is any capacity based on the
geometry of the cylinder and particle size that can be defined as the
nominal or designed capacity, regardless the type of the material to be
processed. This paper introduces the concept of nominal rotation frequency
and defines a nominal capacity that depends on the cylinder radius and the
particle size. This is achieved by taking into consideration, the radius and
rotation frequency of the cylindrical separator, the laws of physics that
determine the free motion of particles in a gravitational field and the
particle size. The strength of the applied field and the susceptibility of
the material are not required for this approach. |
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