X-ray transmission sorter RGS-2
X-ray sorter RGS-2 is designed to enrich diamond material with grain size - 6 + 3mm in the diamond industry. It can operate as a pre-final treatment sorter at reduced throughput.
Principle of sorter operation is based on measurement of X-ray material absorption at two different X-ray radiation energies (dual X-ray energy absorptiometry). It allows separation of materials with different atomic (charge) number (or element number in Mendeleev Periodic Table), i.e. diamonds (Z=6) and rock (Zeff =12).
The primary advantage of RGS-2 over modern X-ray luminescent sorters is the possibility to identify and recover any diamonds from the material flow irrespective of their X-ray luminescence features (poor luminescent or not luminescent).
The sorter includes a sorting section (SS) and electronic section (ES) connected together.
Technical data
Material to be processed Dry, dust-free, classified (contents of main class 85% minimum) Material grain size fraction –6 +3 mm Material supply and transportation system Flow type, 4-stream, 1-stage with supply vibrofeeder.
Throughput 1.2 t/h minimum (– 6 + 3 mm) X-ray: number of X-ray tubes Two (2) X-ray tubes, Mo and W, operating on low and high energy, respectively. mode of radiation Constant anode voltage, anode current 37 kV, 60 mA (Мо); 60 kV, 42 mА (W) Detection: Detection module is provided with two rows of X-ray sensitive rulers with cell pitch of 0.4 mm (for channels of low and high energies) Ejection Local, pneumatic (with compressed air)
Recovery rate 98 % minimum Yield per ejection (with maximum capacity) 0.75 g 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). Failure indication. Electric power supply 1 phase; (220±22) V; (50±1) Hz Power consumption 8 kVA max. Flowrate of potable water to cool the tubes 12 l/min minimum Average compressed air flowrate (0.4 MPa) 4 m³/min Overall dimensions (L×W×H), mass: Sorting section (SS) 2900×970×094 mm; 1185 kg Electronic section (ES) 1125×840×2150 mm; 290 kg Operation Conditions: Ambient air temperature from + 10°С to + 35°С Relative humidity (at ambient air temperature + 25°С) SS – up to 100%
Protection against X-rays Specially designed construction of the sorter totally protects against the X-ray. Each unit is being tested for safety.
Process diagram