Increase the
width of the groove, increase the height of the overflow weir, or
decrease the inclination angle, can increase the classification area.
Grading slot width depends on the screw diameter (ie grading machine
specifications), and the width should be 100 to 200 mm larger than the
diameter.
Inclination of the bottom of the main determinant is decided
by the necessary lifting height of sand return water, and the limit is
no over slipping of the ore.
During the operation, the changeable structural parameters is mainly the height of the over flow weir, but it is rarely changed once decided at the beginning of production.
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During the operation, the changeable structural parameters is mainly the height of the over flow weir, but it is rarely changed once decided at the beginning of production.
The height of over flow weir normally
refers to the declining height between the center of spiral bearings and
the top of over flow weir.
For the high weir classifier, the height is
400 to 800 nun, but for the submerged classifier, the height is 930 to
2000 nun.
The rotational speed of the spiral plates directly influences
the degree of agitation of the liquid surface and the ability to
transport the sand back.
The number of revolutions is related with the
helix diameter, which is in the range of 1.5-10 r / min.
The influence of the nature of the ore on classification mainly shows
in the ore density, grain size and clay content.
Ore density is almost
proportional to the impact on the production capacity of the grading
machine by weight; the influence of feed size composition and clay
content is mainly reflected in the slurry viscosity.
Viscosity increased
and mineral particles settling velocity decreases, the processing power
and the accuracy of classification would all be reduced.
Therefore,
during the feeding process, if the mud is too much, pre-desliming is
needed. But in thr feeder of mechanical classifier, there is no harm to
contain some mud in the ore, on the contrary, sometimes, it is
beneficial.
