international
construction
september 2013
CRUSHING AND SCREENING
50
Choices, choices
However, the rainy climate and clay
material it handles puts demands on its
screening media, especially when it comes
to avoiding blinding and pegging.
Having had trouble producing
aggregates for a road project from clay-
contaminated materials using traditional
mesh, the company turned to distributor
Elrus Aggregate Systems for a solution.
The recommendation that came back
was to use Major Wire 7/8 in (22 mm)
Flex-Mat 3 Series D Tensioned screen media, and this produced
dramatic results.
“The operation went from not being able to produce at all in
marginally rainy weather to being able to operate through heavy
downpours. We’ve recommended Major Wire’s Flex-Mat 3
screen media before and knew it could stand up to the challenge
of screening sticky, clay-ridden material,” said Matt Armstrong,
dealer representative at Elrus Aggregate Systems.
The self-cleaning media allows producers to increase open
area, create more screening action and eliminate blinding
and pegging problems as the wires are able to vibrate
The Petaquilla Gold Mine near Panama City, Panama is
unusual in that it produces aggregates as well as precious metals.
Contractor Panama Development of Infrastructure (PDI) is
using a range of Sandvik drills, crushers and screens at the facility
for the diverse production requirements.
Equipment on the site includes a Sandvik DX800 drill rig,
UJ440i mobile crusher and QA450 triple deck Doublescreen
mobile screener, supplied by national distributor Grupo Tecún.
David Baralt, general manager and chief operations officer at
Servicios Mineros de Petaquilla said, “We are seeking friendly
suppliers, who understand how their
products are connected to our production.
We strongly believe in Sandvik for the
recognised quality of their equipment
worldwide.”
The UJ440i jaw crusher is used to
process Andesite rock from the quarry,
crushing down from 700 mm to
150 mm, at a production rate from
450 to 500 tonnes per hour.
The company also uses a QA450
triple deck Doublescreen, which is able
to achieve a production rate of up to
600 tonnes per hour, depending on the
material, the feed size, and the required
fractions. It can produce four material
sizes, plus an oversize from the grid and
the high production capability is due
to the patented Doublescreen screen
box, which features two independent
triple deck screen boxes. These have
independent drives, that are able to have
their amplitudes and screen angles adjusted depending upon
application.
Components
And the choice of components such as screening media can be
just as important as choosing the right capital equipment, as
Sundre Contracting Co. of Sundre, Alberta, Canada found out.
The company produces more than 30 different product sizes –
from 1.6 mm fine sand to 305 mm screened rock for a range
of customers from road builders, concrete plants and even golf
courses.
Sundre
Contracting’s
crushing &
screening plant
The wash plant, fitted with
Major Wire’s Flex-Mat 3
This Sandvik
UJ440i mobile
crusher is used
to produce
aggregates from
a unique site in
Panama which is
also a gold mine.
