Portable sorter POLUS-M

Sorter POLUS-M is designed to treatment dry diamond concentrate with grain size – 8 + 6, – 6 + 3 and – 3 + 1 mm in the field in order to carry out geological exploration of diamond deposits.

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 and photo 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 control and registration unit (CRU).

Technical data
Material to be processedDry, dust-free, classified (contents of main class 85% minimum)
Material grain size fraction– 8 + 6, – 6 + 3 and – 3 + 1 mm
Material supply and transportation systemFlow type, 1-stream, 1-stage with vibrofeeder. 
Only single layer feed of material to the analysis area is allowed, filling index of the tray is from 5 to 80%.
Throughput (rated)160 kg/h (– 8 + 6 mm) 
100 kg/h (– 6 + 3 mm) 
50 kg/h (– 3 + 1 mm)
X-ray:
number of X-ray tubes1
mode of radiationPulse type (pulse duration – 400+20-40 µs; pulse period – 2.6±0.2 ms).
anode voltage, anode current30 kV max.; 10 mA
Detection:
Single-sided material luminescence detection. 
Analogue-to-digital detection system; operation both in amplitude-time mode and in special mode – increased selectivity using kinetic features of luminescence (extra selection effect is ensured by fluorescent-absorption analysis mode).
luminescent signals’ receivers

photomultiplier tubes (PMT)

number of detectors, detection channels1
EjectionMechanical type. Metal blade with solenoid drive
Recovery rate98% minimum
Yield per ejection (with maximum capacity)Max. 5.0 g (- 8 + 6 mm) 
2.2 grains (- 6 + 3 mm) 
1.7 g (– 3 +1 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.
Electric power supply1 phase; (220±22) V; (50±1) Hz
Power consumption300 VA max.
Cooling of the X-ray tubeAir cooling
Overall dimensions (L×W×H), weigth: (stowage boxes not included)
SM635×300×590 mm, 65 kg (incl. SPTA and installation kit);
CRU490×440×290 mm, 25 kg
Operation Conditions:
Ambient air temperaturefrom + 5°С to + 45°С
Relative humidity (at ambient air temperature + 25°С)80% max.
Protection against X-raysSpecially designed construction of the sorter totally protects against the X-ray. Each unit is being tested for safety.