LS-20-05-2N X-Ray Sorter

The LS-20-5-2N is especially designed for Low Fluorescent diamonds and for the enrichment of wet basic diamond ore with grain size -50 + 20,- 20 + 10 mm.

The sorter’s operation concept is based on the luminescence property of X-ray irradiated diamonds and on the difference of those properties with diamonds and associate luminescent minerals.

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 mm.
Material supply and transportation systemContinuous flow system, single-stage with gravity feeder. 
Non-single layer supply of material to the analysis area is allowed.
Throughput100 t/h (– 50 + 20 mm) 
60 t/h (– 20 + 10 mm)
number of  X-ray tubes
Two-sided exposure on 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±10) mA
Two-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) is possible.
luminescent signals’ receiversPhotomultiplier tubes (PMT)
number of detectors, detection channels4 (2 on each side of the material flow).
EjectionPneumatic, with compressed air, by means of solenoid-operated pneumatic valves. 
4-channel stopping mechanism. Ejection by all 4 valves simultaneously, irrespective of the channel where luminescence was detected.
Recovery rate98% minimum
Yield per ejection (with rated capacity)Max. 2.0 kg (- 50 + 20 mm) 
1.5 kg (- 20 + 10 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 (0.2 MPa)30 l/min min.
Flowrate of potable water to cool the tubes6 l/min min.
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)0.6 m³/min
Overall dimensions (L×W×H), mass:
SM2300×845×2300 mm; 1400 kg
ACR765×555×1750 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