MINERAL SEPARATION
three-chamber alljig jig F(UB) 5000 x 3400.
It is new innovations likely to lead to further
uptake of allmineral jigging solutions across the
wider commodity space.
Ören explained: “Coal and iron ore are the main
drivers of the jig market. However, jigs are applied
in most other minerals where enrichment can be
achieved by density differentiation of the feed
content.
“Our innovation department is responsible for
developing new generations of jigs to decrease
energy consumption,” he said, explaining that the
company launched a new generation of jig drive
last year that offered an air consumption less than
40% of the previous generation.
And, on addressing the need for reducing the
water consumption of a processing circuit, which
Ören says is affected by the moisture of the feed
leaving the plant, the company can refer to allair.
“The separation principle of allair is the same
as alljig – the material is pulsated upwards and
the heaviest sediments lift first and a layering
process proportional to density takes place,” Ören
said. “Theoretically, this makes allair applicable to
any alljig process.
“On the other hand, air has limited carrying
capacity and separation is affected by the moisture
of the feed; the feed must be fragmented by air.”
Ören says the company has successfully
applied allair in coal, rubble and pumice operations,
but sees potential in other minerals as well.
“Our testing facility with pilot allair is open for
R&D works of different applications, and we also
have a full plug and play-type allair unit for testing
on the site directly.”
performance at throughputs in excess of 100 t/h,
according to Sepro. Each machine consists of a
single moving part where a feed stream enters the
machine and is divided into high- and low-density
fractions. Proportioning of exit streams can be
controlled by the operator, according to the
company. These machines are typically used for
mineral recovery applications that require a high
mass yield to mineral concentrate ratio, such as
tin, tantalum, tungsten, chrome, cobalt, iron, fine
oxidised coal and uranium.
Falcon UF (Ultra-Fine) gravity concentrators help
economically recover and upgrade particles as fine
as three microns, according to the company. The
primary objective of the machines is to scavenge
ultra-fine mineral particles typically rejected from
mining plant processes as slimes.
A typical application for a Falcon SB (Semi-
Batch) gravity concentrator, meanwhile, is
recovering liberated precious metals such as gold,
silver and platinum within a grinding circuit.
Outside grinding circuits, Falcon SB gravity
concentrators are also used for precious metal
separation from aggregate or placer deposits.
Smart cyclones
To further optimise plant operations, FLSmidth has
devised an automated monitoring and control
solution for reducing hydrocyclone-related
process deviations.
These high throughput separation devices are
used for separating slurry particles based on
particle weight and, although they have been in
use in the mining sector for decades, their ability
Over 40 years experience as a lead
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Gravity gold
Sepro Mineral Systems is, too, looking to applying
waterless mineral separation processes at mine
sites.
One of its 2020 R&D projects includes the
development of a new gravity concentrator that
eliminates water consumption during the gold
recovery process.
The current Falcon SB gravity concentrator,
which recovers precious metals like gold, flips
between periodic run and rinse cycles, meaning
process water consumption is already low. Even
so, Sepro is intent on devising a way to maintain
high levels of gold recovery and eliminate the
need for excess water.
This will improve mill circuit performance and
reduce the amount of water that needs to be
removed later in the process, according to the
company.
Sepro can look to its waterless Falcon C and UF
gravity concentration technology for inspiration.
Falcon C (Continuous) technology has been
proven in commercial applications to be able to
withstand 300 G concentrating fields while
delivering superior metallurgical and mechanical
Bunting High Intensity
Three Disc Magnetic Separator
Ability to recover and separate six magnetic
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MAY 2020 | International Mining 31