X-ray luminescence sorter LS-OD-50-03N

Sorter LS-OD-50-03N is designed for pre-final and final treatment of concentrate with grain size – 50 + 20, – 20 + 10 and – 10 + 5 mm.

The sorter operation concept is based on the use of diamonds’ property of luminescence under X-ray impact and on the difference of those properties with diamonds and associate luminescent minerals. The mode under reference term “luminiscence and absorption” when the X-ray tube andphoto detectors are located on both sides of the material flow is implemented. The effect of difference in X-ray absorption by diamonds and associate luminescent minerals is used.

The sorter includes a sorting machine (SM) and an automated control rack (ACR).

Technical data
Material to be processedWet, clean from clay and slurries, classified (contents of the main class – 85% minimum)
Material grain size fraction– 50 + 20, – 20 + 10 and – 10 + 5 mm.
Material supply and transportation systemGrain-by-grain, 2-stream, one-stage type with vibrofeeder. 
Optional installation of collector (tank) for concentrate.
Throughput2.5 t/h max. (– 50 + 20 mm) 
0.5 t/h (– 20 + 10 mm) 
0.12 t/h (– 10 + 5 mm)
X-ray:
number of X-ray tubes
Single-sided exposure of material flow in the freefall tray.
mode of radiationPulse type (pulse duration – 0.5 ms; pulse period – 4 ms)
anode voltage, anode current(33-2) kV max.; 330 mA
Detection:
Single-sided material luminescence detection. 
Analogue-to-Digital Processing System; operation both in amplitude-time mode and in special mode – increased selectivity using kinetic features of luminescence (extra selection effect is ensured by luminescent-absorption analysis mode).
luminescent signals’ receivers

photomultiplier tubes (PMT)

number of detectors, detection channels.2 (one per a stream).
EjectionPneumatic, with compressed air, by means of solenoid-operated pneumatic valves. 
2-channel stopping mechanism. Channel-by-channel ejection.
Recovery rate98.5 % minimum
Yield per 10 ejections (at maximum capacity)Max. 15 grains (- 50 + 20 mm) 
18 grains (- 20 + 10 mm) 
22 grains (10 +5 mm)
AutomationChecking of main systems prior to start of material supply and in the course of operation (material supply is stopped if fault is detected). Sensitivity control. Failure indication. Monitoring and control from the APCS of enrichment plant. 
Protection system against unauthorized access to SM, material only if special smart cards are available.
Electric power supply1 phase; (220±22) V; (50±1) Hz
Power consumption5 kVA max
Transportation water flowrate (0.015 MPa)1.2 (m³/h) max.
Flowrate of potable water to cool the tubes5 l/min minimum
Flowrate of potable water to wash the windows of photo receptors and tube collimators (0.3 MPa)0.5 l/min max
Volumetric compressed air flowrate (0.6 MPa)5 l/min minimum
Overall dimensions (L×W×H), mass:
SM1830×850×1800 mm, 1100 kg;
ACR765×550×1745 mm, 230 kg
Operation Conditions:
Ambient air temperaturefrom + 10°С to + 35°С
Relative humidity (at ambient air temperature + 25°С)
SM – to 100% 
ACR – to 80%
Protection against X-raysSpecially designed construction of the sorter totally protects against the X-ray. Each unit is being tested for safety.
Dimensional drawing
Installation drawing
Process diagram