X-ray luminescence sorter LS-OD-50-04-01
Sorter LS-OD-50-04-01 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 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. It is equipped with system of contactless concentrate transportation from sorter to glove box. It is provided with reduced service area. It has increased sensitivity and enhanced recovery of type II diamonds.
The sorter includes a sorting machine (SM) and an automated control rack (ACR).
Technical data
| Material to be processed | Wet, 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 system | Grain-by-grain, 2-stream, one-stage type with vibrofeeder. Optional installation of collector (tank) for concentrate. |
| Throughput | 2.5 t/h max. (– 50 + 20 mm) 0.5 t/h (– 20 + 10 mm) .12 t/h (– 10 + 5 mm) |
| X-ray: | |
|---|---|
| number of X-ray tubes | 1 Single-sided exposure on material flow by two X-ray tubes, the first gives “pumping” in the tray. The second is located in the freefall tray in detection area. |
| mode of radiation | Pulse 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). |
| Ejection | Pneumatic, with compressed air, by means of solenoid-operated pneumatic valves. 2-channel stopping mechanism. Channel-by-channel ejection. |
| Recovery rate | 98.5 % minimum |
| Yield per 10 ejections(at maximum capacity) | Max. 15 grains (- 50 + 20 mm) 18 grains (- 20 + 10 mm) 22 grains (10 +5 mm) |
| Automation | Checking 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 supply | 1 phase; (220±22) V; (50±1) Hz |
| Power consumption | 5 kVA max. |
| Transportation water flowrate (0.015 MPa) | 1.2 (m³/h) max. |
| Flowrate of potable water to cool the tubes | 5 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: | |
| SM | 1755×877×1900 mm, 1157 kg |
| ACR | 765×555×1745 mm, 230 kg |
| Operation Conditions: | |
| Ambient air temperature | from + 10°С to + 35°С |
| Relative humidity (at ambient air temperature + 25°С) | SM – to 100% ACR – to 80% |
| Protection against X-rays | Specially designed construction of the sorter totally protects against the X-ray. Each unit is being tested for safety. |
