Classificatio Processes
In designing and operating a mining/mineral
processing operation, there are some basic equipment and processes
that are important.
Of these sizing and classification is high on
the list. This is because most concentrating operations work
best on specific size ranges.
Figure 1 – Range of Applications
General
Cyclone Sizing
Classifying cyclones separate predominately based on the
differential size of the particles, with the finer sized going to
overflow and the coarser particles going to underflow.
Water-only or Hydro-cyclones separate based on differential
specific gravity, with the lighter particles going to overflow.
Dense (heavy) medium cyclones accentuate the gravity
separation by using a separating media of known and controlled
specific gravity.
Vibrating Screens
Vibrating screens are primarily classification devices, used
for separating a feed stream into two or more products of different
size ranges. They are
also used for dewatering products from
cleaning processes, and for media recover following dense medium
separation. If they are
used to remove excess of water and fines from a feed stream prior to
cleaning they are often referred to as desliming screens.
The general nomenclature and definition of screens whether
they are used for classification or dewatering is essentially the
same.
Sieve
Bends
Sieve bends are classification devices commonly used ahead of
vibrating screens for initial size separation and in dewatering
stages to remove the bulk of the water and very fine size particles
from the vibrating screen to reduce its load.
They can be used by themselves in one or two-stage units
after cyclones or by themselves, and before flotation, again, as a
dewatering and classification step.
The sieve bend is a curved, stationary sieve developed by the
Dutch State Mines organization.
To improve screening efficiency, especially on very fine
coals, use of vibrating sieve bends has been done successfully at
several operations.
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40+ years’ experience in the mining industry with strong mineral
processing experience in precious metals, copper, industrial
minerals, coal, and phosphate
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Operational experience in precious metals, coal, and phosphate plus
in petrochemicals.
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Extensive experience performing studies and determining feasibility
in the US and international (United States, Canada, Mexico, Ecuador,
Columbia, Venezuela, Chile, China, India, Indonesia, and Greece).
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E-mail:
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