X-ray luminescence sorter LS-50-05
Sorter LS-50-05 is designed to enrich wet basic diamond ore and treatment contentrate 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 following analysis modes are implemented:
• with single-side placement of the X-ray tube and luminescent receivers relatively to the material flow;
• 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; herein, 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 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 | Flow-type, two stages of treatment with gravity feeder with automated controlled damper and vibrofeeder. Only single layer supply of material to the analysis area is allowed. |
| Throughput | up to 30 t/h (– 50 + 20 mm) 20 t/h (– 20 + 10 mm) 9 t/h (– 10 + 5 mm) |
| X-ray: | |
|---|---|
| number of X-ray tubes | 2 One tube per each stage. |
| mode of radiation | Pulse type (pulse length – 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 (extra selection effect is ensured by luminescent-absorption analysis mode). | |
| luminescent signals’ receivers | photomultiplier tubes (PMT)) |
| number of detectors, detection channels. | 8 (4 per each stage). |
| Ejection | Pneumatic, with compressed air, by means of solenoid-operated pneumatic valves. 4-channel stopping mechanism (1 valves per each channel) at each stage. Channel-by-channel ejection. |
| Recovery rate | 98.5 % min. |
| Yield per ejection (with maximum capacity) | Max. 0.7 kg (- 50 + 20 mm) 0.3 kg (– 20 + 10 mm) 0.1 kg (– 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 | 6 kVA max. |
| Transportation water flowrate (0.2 MPa) | 20 l/min minimum |
| Flowrate of potable water to cool the tubes | 4 l/min minimum |
| 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) | 4 m³/min |
| Overall dimensions (L×W×H), mass: | |
| SM | 2550×870×2580 mm; 1800 kg |
| ACR | 765×550×1750 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. |
