TNT’s Super Portable technology was
then applied to a radial stacker in Chile
in 2004 and to a HC/radial stacker in
Peru in 2005. By 2007, the standard
Super Portable design had reached 250 ft
(with longer designs also available).
Between 2007 and 2015, TNT
supplied complete Super Portable
stacking systems to two copper mines in
Arizona, US, and one in Chile. These are
the three largest multiple-lift mobile
HLS systems in the world, processing
8550 tph, 7200 tph and 5467 tph.
Stacking dry tailings
In 2009 – 2012, TNT designed and
supplied two Super Portable systems for
stacking acidic phospho-gypsumwaste
at the Ras Al Khair phosphate facility in
Saudi Arabia. The design criteria for this
facility included a minimum operational
uptime of the conveying and stacking
system because any interruptions in the
removal of waste from the phosphoric
acid plant would cause acid production
stoppages. This required an overland
conveying network that could feed
either of two alternate paths for the
tailings with two parallel
conveying/stacking systems that
alternate stacking duties. The standby
system operates with its motors running
at a fraction of full speed so it can be
brought up to full speed and material
can be diverted to it quickly whenever
the on-duty stacking system is shut
down, resulting in virtually no
downtime for the changeover.
This ‘hot standby operation’ concept
handles planned and unplanned
shutdowns by providing full
redundancy at nearly all times, and
could be considered for any bulk
material handling that cannot be
interrupted, such as stacking a mine’s
overburden or a concentrator’s dry
tailings.
Application to mobile
coal handling
The most promising application of these
mobile stacking concepts is in
overburden stacking, combined
wherever possible with IPCC. Amobile
crusher (or feeder-breaker) operating in
a multiple-bench pit can feed a mobile
HC with full-length receiving hopper.
From here, the material can be conveyed
via up-bench conveyors with Super
Portable technology out of the pit and
onto the overland conveying network.
This network can then convey the
material to the processing plant or to the
overburden stacking area.
Some special components would
need to be incorporated into the
equipment design for coal-handling
applications, such as explosion-proof
electrical systems. In addition, attention
to coal industry best practices for
state-of-the-art dust control technology
is necessary. The conveyors would be
likely to have wider belts to
accommodate material densities lower
than that of ore and relatively high
tonnages.
Identical Super Portable conveyors
can be used in the pit for removing
shovelled material and in the stacking
line for stacking overburden. This
minimises the required spare
components and reduces the
warehousing needs of mine
maintenance.
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