Dust collection and noise control in beneficiation plant
Dust and noise
are two main working environment problems in beneficiation plant. Although the auxiliary equipment like dust
collectors are not main mining machine in
plant, they are Equally important. There are many good measures to deal with
dust and noise problems and widly used in many plants such as iron ore processing plant, gold beneficiation plant , coal plant
etc.
1.Dust collection
The dust removal
and dust collecting systems are very similar to a normal dry classification
circuit. Dry classification is in fact a dust removal system where the max size
of the dust is controlled by a classifier (or ventilation criteria), See figure
1 .
igure 1. dust collection system
Primary recovery
of dust is normally done in a cyclone taking the major part. The final
recollection is done in a wet scrubber or a fabric filter. Wet scrubber has an
advantage over fabric filter when the dust is combustible. In all other cases
the dry fabric filtration is more effective as no sludge handling is required
(being the case with wet scrubbers).
2.Noise control
There are 4 main
ways to reduce the noise levels for processing systems including crushers,
mills ,flotation machine and screens.
2.1.Optimum operation
Mass flow
equipment like crushers and screens are normally lower in noise when they are
operated under optimum conditions and the material flow is absorbing part of
the noise (e.g. choke fed cone crushers). Reduced circulating loads also lead
to reduced noise levels.
2.2. Internal polymers
The use of
polymers as mill liners, screening media and wear protection
in material
handling systems (chutes and transfer points) have a dramatic effect on noise
reduction. For grinding mills a rubber lining can reduce the noise level up to
10 dB(A) compared to a steel lining. See fig2.
Figure2.different
liners for ball mill noise
2.3.External polymers
Using polymers as
dust sealing enclosures of crushers, screens, conveyors, chutes, transfer
points etc. will give a noise reduction of approx. 5-10 dB (A). The difference
for a screen with steel wire deck and rubber deck is shown fig3.
Figure 3. difference for a screen with steel wire
deck and rubber deck
2.4. Noise reduction walls
Enclosure is an
effective way of reducing noise. Enclosure can be more or less extensive
(enclosure of drive or machine or both). With a total enclosure noise levels
can drop by 10-15 dB (A).
sinonine can also provide sand washing plant epc.
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