FLOW X-ray diamond recovery machines are based on X-ray induced luminescence of diamonds. Although this basic principle goes back to the 1930s and became popular in South Africa in the early 70s FLOW has pioneered and introduced much advancement in this technology. FLOW SORT ‘XR’ diamond recovery machines are designed to sort WET or DRY diamondiferous material, under virtually any conditions. Model XR400DW is the latest addition to the FLOW SORT sorting machine stable.All FLOW SORT models are equally suitable for ‘fixed’ installations as for ‘mobile’ plants, be it on terra firma or on board a ‘marine’ diamond-mining vessel.Since the launch of FLOW’S “XR” sorter range in 1993, FLOW has sold over 600 units to diamond miners and diggers all over the world.

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CONTAINERISED FLOW X-RAY DIAMOND RECOVERY PLANTS are specifically designed to sort WET
(or DRY) diamondiferous material. FLOW offers containerized X-ray recovery plants fitted with one or two SINGLE STAGE MODELS coded as XR 2/50 DW or alternatively fitted with one or two TWIN-STAGE MODELS (double pass sorters) labelled TSXR 2/50 DW. Our container plant design follows the same robustness, reliability, high recovery efficiency, easy operation and low maintenance concept, as well as our uncompromising after sales service that earned our products acceptance in the market place.

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Can be made ready to transport or set-up for operation within 3 hours!
Peace of mind operation: can be fitted with a remote sorter / plant control and monitoring system flow x-ray diamond recovery trailer plants are specifically designed to sort WET (or DRY) diamondiferous material.
FLOW offers X-ray recovery trailer plants fitted with one SINGLE STAGE MODEL coded as XR 2/50 DW
Our TRAILER design follows the same robustness, reliability, high recovery efficiency, easy operation and low
maintenance concept, as well as our uncompromising after sales service that earned our products acceptance in the
market place. Optionally FLOW X-RAY DIAMOND RECOVERY TRAILER PLANTS can be supplied with an integral diesel
generator power-plant. Emergency 12 Volt lights are standard on our trailer X-ray plants.

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By now I am in the electronic sorting business for 35 years. Coming from an electronic background, I have learned very quickly that an electronic sorting machine would only sort as well as its feed presentation! And this principle held true throughout my career
in electronic sorting. It was not the sophistication of electronic systems, the design and selection of appropriate sensors, the precision and speed of ejection devices or the writing of clever algorithms that made for a good sorter. Yes, all these devices and systems are
important in the design of an electronic sorting machine, but no matter what sorting problem I had to tackle (Uranium, Gold, Scrap-Metal, Limestone, Talcum, Coffee Beans, Nuts, Beans, Diamonds, and so on...) I only succeeded to produce a successful sorter if I
was able to feed the material in a “satisfactory manner”.

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In every diamond mine or diamond digging no matter how large or small there is a stage that finishes off the diamond recovery process, THE FINAL DIAMOND RECOVERY STAGE.
Any diamond mining operation has put a lot of effort and money into each diamond that finally ends up in the final recovery section of the plant. It is therefore of utmost importance that all precautions necessary are taken to ensure no diamonds get lost at this vital stage.
Today all the necessary final diamond recovery equipment, for any diamond mining operation, is readily available.

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One of the most important operating parameters of our Flow Sort X- Ray diamond recovery machines is the feed presentation to these sorters. Poor feed preparation will lead, without fail, to poor diamond recovery efficiency. Feed preparation starts with proper feed material sizing and feed material cleaning. For appropriate size range refer to the relevant sorter model specifications. Please note that “dirty” feed water, excessive “free” water flow to the sorter with the feed material will most definitely effect the diamond recovery efficiency of our diamond recovery machines!

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One of the most serious operating problems of any x-ray florescence based diamond recovery machine is the possibility of passing to much material “KILOGRAMS PER HOUR” through the sorter ...‟Over feeding‟ the sorter. Even when the sorter is properly adjusted there are factors, essentially out side the machine operators control them can lead to over-feeding. For instance a change in material particle size distribution, a change in feed material loose water content, variations in material cleanliness (a problem very common with kimberlite) etc. The most common problem however is the deliberate increase of sorters feed rate beyond its maximum capacity in order to treat more material, end a shift more quickly or simply make up for production shortfall (usually caused by various plant breakdowns).

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This write-up is not intended to explain and reason WHY and WHEN a FLOW SORT X-RAY DIAMOND RECOVERY MACHINE should be fitted with an optical band-pass filter such as our K45 or our K42. The following is intended to explain and quantify the effects that such filters have on the set-up of our sorters. A FLOW SORT TRACER-MARBLE typically produces a luminescence level of 2.5 μlm (micro-lumen) when it passes through the X-ray beam of a Flow Sort machine. (Note that only a small portion of this luminescence actually reaches the PM-tube, without any optical filter fitted! This amount of luminescence will generate, depending on how sensitive the PM-tube is set, a signal of say 1.5 μA (note that a signal > 1.0 μA is required to trigger the sorters ejector).

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Each Flow Sort Diamond Recovery Machine provides for a remote sorter control.
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The purpose of this interface facility is to allow basic sorter operation to be executed from a remote sorter / plant control centre. The interface caters for sorter control inputs as well as for sorter interlock / sorter operation status outputs.

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It is assumed that the person executing the set-up procedure is has read through the “FLOW SORT DIAMOND SORTER MANUAL” and is fully familiar with the operation of the FLOW SORT DIAMOND RECOVERY MACHINE MODEL to be set up! It is further assumed that the sorter to be set-up is 100% functional and there is no possibility that the sorter‟s diamond recovery efficiency may be impaired by faulty components, faulty sub-assembly or simply by a poor general state of sorter due to lack of maintenance.

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The secret in the design of the Optic Window frame (Flow part number 4960) in a Flow Sort machine is the correct combination of components that will give the required optical clarity, a minimum of self-luminescence , produce the correct bonding to the stainless steel frame to ensure 100% waterproofing and at the same time have the same wear characteristics as the surrounding stainless steel feed-slide. This may sound simpler than it is! Flow has developed and improved this critical sorter part over several years. Feed optic window frames manufactured by Flow are designed to meet these requirements. The polyurethane used by us has been specifically formulated for Flow, there is no such substitute product on the market.

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First of all consider the following:
a. X–ray diamond recovery machines are the last and final link in the entire diamond mining process.
b. A lot of mining costs are incurred by the time the final diamond concentrate reaches the X–ray diamond recovery stage.
c. It is therefore obvious that these X-ray diamond recovery machines must at all times operate at absolutely peak performance to ensure that no diamonds report to tailings.

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For details regarding the electric power requirements of FLOW SORT machines please refer to the relevant technical specification.Typically our sorters require 3 Phases, 380 Volt, 50 Hertz power. 3 phases, neutral, earth
On request we have supplied sorters for different voltages (190V, 415V, 550V etc) as well as different frequencies (60 Hertz). What is of importance is whatever the nominal supply voltage, this voltage remains within specified limits and there is a sound earth connection! The potential between neutral and earth should be 0 (zero) but must never exceed 1 (one) volt.

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ONLY PERSONNEL PROPERLY TRAINED AND QUALIFIED IN THE HANDLING AND MAINTENANCE OF HIGH VOLTAGE EQUIPMENT AND X-RAY GENERATING EQUIPMENT MAY CARRY OUT THE WORK HEREAFTER
DESCRIBED.
The high voltage connection from the x-ray generator to the x-ray tube is made via a high voltage cable and a special high voltage cable adaptor.

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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 (PTY) LTD.

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1. YOU ARE OVER-FEEDING YOUR SORTER
     a. Refer to the maximum permissible feed rate specification
2. YOUR FEED MATERIAL SIZE RANGE IS TOO LARGE
    a. Refer to the recommended material size range specification
3. YOUR WATER FLOW SET-UP AND WATER FLOW VOLUME IS WRONG
    a. Check as per Flow Sort specifications

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BACKGROUND
a. Flow Sort diamond recovery machines employ a different x-ray – optic geometry as compared to other x-ray diamond recovery machine makes and models.
b. The Flow Sort x-ray / optics geometry is such that optical luminescence detection of a particle is taking place on side opposite to the side irradiated with x-rays. This Flow Sort design concept has got several advantages over traditionally employed geometry whereby a particles luminescence is detected at the same side as irradiated by x-rays.
c. One of the major advantages of the Flow Sort concept is the ability to distinguish between surface luminescence of a particle and luminescence of a diamond.

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Tracer test record - Read More

Instructions to tracer test - Read More

Partition tracers - Read More

 

 

 


GENERAL SECTION
1. Page 1 must be completed after each and every site/service visit no matter what!!!!
2. Page 2 must be completed when optic, ejector, x-ray, and feed system is updated.
3. Enter the date when this record is being made
4. Enter the FLOW SORT machine model number.

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