ORE SORTING AND GRAVITY_proof 27/04/2016 10:07 Page 5
ORE SORTING AND GRAVITY
The intellectual property of U-pgrade is held
by the wholly owned subsidiary Uranium
Beneficiation.
The results for the Marenica Project ore are
summarised below;
up to 120 t/h. The combination of residual energy
(air pressure and volume) from the lower deck is
used with an additional small airflow from the main
fan (via bypass) for stratification of the material on
the upper deck. The working principle is illustrated
in the following schematic.
Before
After
The big advantage of this
Ore sample
1 Mt @ 100 ppm
13,000 t @ 5,000 ppm
design is that – although
Process recovery
75%
72%
capacities have been
OPEX
$80/lb
$40/lb
doubled – the footprint of
the jig plant remains the
The concentration of uranium in the feed to
same and the jigging air requirement is only
the leaching circuit dramatically reduces the
marginally increased compared to the single deck
mass of ore to be leached and therefore the size
units. The first such plant was commissioned
of the traditional leaching plant. Initial
successfully last year in India where 35 allair jig
assessments and estimates indicate that by
units are in operation already, the largest number
using this new process a reduction in operating
in a single country worldwide.
costs of 50-70% and capital costs of 30-50% is
achievable.
Another new development from allmineral is
related to the gaustec® wet high intensity
magnetic separators (WHIMS). While over recent
years increased feed capacities have been the
focus of the R&D work, which resulted in feed
capacities of up to 1,400 t/h per unit, safer and
trouble-free operation was the goal of gaustec’s
latest development, the gaustec® NoBLOCK
screen. This NoBLOCK screen sits upstream of the
WHIMS and avoids the known, but so far
unsolved issue of clogging of matrix boxes by
oversize materials. Such clogging results in less
efficient separation, capacity reduction and
finally plant downtime for cleaning the matrix
The principle of operation of allmineral’s
NoBLOCK screen
Jigging and more
In the early 2000s allmineral introduced the
allair® jig which works dry with air only in coal.
Since then about 80 allair jigs have been
supplied for coal preparation plants in the US,
India, Colombia, Spain and Ukraine. Capacities of
these jigs are – depending on the feed size –
between 60 and 30 t/h.
The capacities per jig can be doubled by using
the recently developed allair type MP fitted with
two jigging decks in one unit reaching capacities of
Complete Lab Services for
Flow Sheet Development
With more than 20,000 sq.ft. of dedicated laboratory space and an array of lab
and pilot equipment, the Eriez Flotation Division (EFD) has the tools to test and provide
detailed process analysis and state-of-the-art solutions for nearly any application.
To
T
o see
se iit all
ll visit
visit
EriezFlotation.com
Eriez’ Flotation Lab Equipment includes:
• Single and multi-stage column flotation circuits
• Bench top flotation cells
• Pilot-scale columns
• Lab-and pilot-scale HydroFloat Separators
• Lab-and pilot-scale CrossFlow Separators
• Grinding equipment (cone, ball, and rod mills)
• The CPT Mini Pilot Plant
• XRF analytical capabilities