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Replacement rotary coal breaker
drum being transported to Middelburg Mine Services.
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Replacement rotary coal breaker drums for
BHP Billiton
BATEMAN has supplied replacement drums for two rotary coal breakers,
in a R6,6M contract, for Middelburg Mine Services of the BHP Billiton
group, on two of its coal mines: Klipfontein and Middelburg Mine Services
South. A replacement drum for a third breaker has been ordered and
is being manufactured for Middelburg Mine Services South. Each drum
is 9,346 m in length and 5 m in diameter, with a mass of more than
90 t.
The two collieries are adjacent opencast
operations, situated approximately 20 km south of Middelburg in Mpumalanga,
RSA.
The BATEMAN gravity-type breakers are used
in a secondary-crushing application, each with the capacity to process
1 600 t/h of a feed of run-of-mine (ROM) coal pre-crushed by a giant
jaw crusher. They offer a number of advantages over other breakers,
including an internal design which provides for improved material
cut and a modified cast-screen-plate design which results in better
throughput of the material.
A breaker is essentially a large rotating
cylinder, powered by a 185 kW electric motor, which can be used to
simultaneously size and clean raw coal, for primary ROM and secondary
coal crushing and cleaning, and to separate out other materials. Coal
is introduced through the feed end where product-size coal is screened
through screen plates. The larger coal is lifted into the cylinder
where it is dropped and shatters on impact, resulting in a minimum
production of fines because the coal fractures along natural cleavage
lines.
Coal that is not product size is lifted and
dropped until it passes through the screen plates. Reject material
such as rock, slate and other material that resist breakage will eventually
flow to the discharge end to be ejected by a refuse plough.
Breakers can handle large lumps
of ROM material without the risk of blockage and offer minimal risk
of the screen-plate perforations plugging. They also offer effective
dust extraction and treatment of dust-laden air, as well as low operating
costs and downtimes. Robust in design with a high cylinder strength,
the machine is easy to maintain and repair, driven in this instance
from both ends by a simple assembly.
For further information, please
contact
Paul Davies, BATEMAN Manager, Spares & After-Sales Services, on
11-345-5000 or email engtech@batemanengineering.com.
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