Flow can only guarantee field work done by Flow Sort / Flow
Electronics employees or by one of our official agents. Work done by any
other party or the use of any non Flow approved parts may not only
invalidate your products warranty but also affect the efficiency of your
FLOW machine and may even jeopardize the all important X-Ray Radiation
safety standard built into our products!
FLOW ELECTRONICS (FLOW SORT) was founded by Peter Wolf in 1971. FLOW
has been involved in the design and manufacture of electronic sorting
machines ever since! Today FLOW has grown to become the biggest
manufacturer of x-ray diamond recovery machines in the world!
Peter Wolf, the founder of FLOW, has designed and built over 650 (six
hundred and fifty) X-ray diamond recovery machines. Some 250 units via
GUNSON SORTEX (commonly referred to as "A SORTEX"), FLOW has sold
further 400 machines (commonly referred to as "A FLOW SORT" or as a
"WOLF-MACHINE"). It will be hard to find another company which comes
even near to our expertise in electronic sorting! Just for interests
sake take note that Wolf also holds over a dozen patents relating to
electronic sorting in his name.
In order to successfully recover diamonds by means of the
luminescence properties they exhibit when exposed to x-rays it is
essential that each and every particle that passes through such a sorter
is exposed to x-rays and at the same time is visible to an (optical)
luminescence detection device. If the ratio between 'large' and 'small'
particles becomes too large then there is an ever increasing probability
that a large particle will shield a smaller one from x-rays or prevent
the luminescence of a diamond from reaching the sorters optic!
In the past I (Peter WOLF) have designed and built 'large capacity'
sorters. The famous 100 ton / hour SORTEX built for Cullinan Diamond
Mine and for Letseng Diamonds in the mid 70's bear witness to this. So
there is no technical reason for not building large capacity sorters.
There is however a very real practical reason. Several 'smaller' sorters
provide a much more flexible set-up for any recovery plant. Changing
the allocation of sorters for different size fractions, taking
individual sorters out for service without major plant through-put
interruptions. If a large sorter breaks down a substantial amount of
recovery plant capacity is lost which often causes a plant shut-down,
this is not the case when a 'small sorter' goes down! Needless to say
those small sorters are much more 'mobile' than large ones!
Do not attempt to set-up or test any Flow Sort X-Ray Diamond Recovery
Product with luminescent tracers which have not been officially
approved by Flow Sort. If in doubt if the tracers that you are using
have been approved by Flow Sort or not please verify with us before
UNLIMITED. Our ejector gates can perform 20 (twenty) full opening /
closing cycles per second. If this is not enough then the ejector gates
simply remain open until all diamonds (tracers) are recovered!
This is a very debatable subject. The answer is YES and NO, it
depends on many circumstances. But what we can say with confidence, when
comparing apples with apples, is that our mechanical ejector does not
generate more than 25% concentrate as compared to a pneumatic ejector.
For actual yield figures refer to our technical sorter specifications.
A twin stage provides a 100% back-up. Please note that any of the two
stages of our TSXR machines can operate on it's own as a stand-alone
sorter. This is ideal when operating in a remote area, as you don't need
any 'stand-by' spares. Further note that all parts of the two sorter
stages are fully interchangeable.
It does not! A single stage sorter that is properly set-up and
operated within its operating limits will recover as many diamonds as a
twin stage sorter (two sorters in series). If overfeeding (up to some
50%) or poor material sizing (ratio of greater than 3.1) is envisaged
then a TSXR sorter will improve the sorters diamond recovery effeciency
quite considerably.(The masking of the same diamond in two successive
sorter stages is rather unlikely!)
With over 550 FLOW SORTS sold we guarantee spares availability to all
our customers for all our sorter models. Please feel free to check
references. We provide 24/7 world wide service for all our products.
FLOW SORT has a track record of supplying sorters that recover well
over 99% of diamonds that become luminescent when exposed to x-rays. By
'diamond-value' our sorters efficiency gets very close to 100% indeed!
The guarantee for this performance lies in the hands of the operators of
our sorters! (good maintenance, proper sorter set-up, keeping to the
sorters operating limits etc.)
An often asked question indeed! The answer obviously depends on the
size and type of material put through the sorter! A 'thumb-suck' kg/hour
figure can be obtained by multiplying the average particle size (given
in mm) by 200 (two hundred). Please refer to the relevant sorter
Just another smear campaign by our competitors. There are tracers and
there are tracers! Some which do not possess luminescence properties of
a diamond but rather the properties of "other" luminescent minerals
(which we avoid to recover).These tracers CANNOT be used on a FLOW SORT
Then there are tracers which are good replicas of
diamonds (as far as their x-ray luminescence is concerned). THESE are
the ones to use with FLOW SORT machines! (Please check with FLOW SORT
which tracers have been approved for use on a FLOW SORT.)
Recovery of tracers that do NOT have the luminescence
characteristics of diamonds bear NO relevance to the recovery of 'real'
Optical sorting has potential in separating particles which have a
different appearance (including differences that show up under IR as
well as UV). A diamond can most definitely be distinguished from the
gang material that it appears in by means of its optical
characteristics. In practice it is however difficult to achieve the high
recovery efficiency (close to 100%) that is demanded from a diamond
recovery machine. X-ray luminescence sorting has been around for many
years and is a well proven technology. We only see optical sorters as a
complimentary technology to x-ray sorting. Where it might find use is
diamond mines that have a sufficient amount of non-luminescent diamonds
that warrant the extra capital investment.
Grease based diamond recovery technology a much more likely back-up
to x-ray sorters then optical sorting machines. Grease tables and grease
belt / drums etc. have been around for a long time. The technology
itself has proven itself over 100 years. The reason for x-ray sorters
having replaced grease tables at diamond recoveries all over the world
is manifold. Security being the biggest factor, followed by the operator
skill that is required (water, temperature, grease-properties etc.) and
also the problem encountered with "coated" diamonds.
If there is any possibility of a feed material
containing non-luminescent diamonds then we strongly advise to feed the
FLOW SORT tailings over grease (not another x-ray sorter). If feed
material to an x-ray sorter does contain non-luminescent diamonds (which
is rather the exception than the rule) then their percentage as
compared to the luminescent type diamond is generally very small.
Yes, Flow Sort has a "Same-Shaft Motor-Generator" (Electric
Generator) available in standard 5.5kVA and 10kVA. The principle of this
device is simple yet extremely effective. The supply to the sorter is
fed to an electric motor which in turn drives an altenator which
supplies the sorter(s). There is no galvanic connection between the
supply to the motor and the output of the generator. This option if FLOW
SORT'S preferred sorter protection.