X-ray luminescence sorter LS-20-04-3N

Sorter LS-20-04-3N is designed to enrich wet basic diamond ore and re-treatment the concentrate with grain size – 20 + 8 and – 8 + 4 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 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– 20 + 8 and -8 + 4 mm.
Material supply and transportation systemFlow-type, two stages of treatment with  vibrofeeder. 
Only single layer supply of material to the analysis area is allowed.
Throughput (rated)20 t/h (– 20 + 8 mm) 
9 t/h (– 8 + 4 mm)
X-ray:
number of X-ray tubes
One tube per each stage.
mode of radiationPulse type (pulse duration – 0.5 ms; pulse period – 4 ms).
anode voltage, anode current(33-2) kV max.; (330±10) 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) is possible.
luminescent signals’ receiversphotomultiplier tubes (PMT)
number of receivers, detection channels.4 (2 per each stage).
EjectionPneumatic, with compressed air, by means of solenoid-operated pneumatic valves. 
2-channel stopping mechanism (2 valves per each channel) at each stage. Channel-by-channel ejection
Recovery rate98% min.
Yield per ejection(with rated capacity)Max. 0.5 kg (- 20 + 8 mm) 
0.3 kg (- 8 + 4 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 consumption4.5 kVA max.
Transportation water flowrate (0.2 MPa)40 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)0.4 l/min max.
Average compressed air flowrate (0.4 MPa)0.6 m3/min min.
Overall dimensions (L×W×H), mass:
SM2150×880×2300 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