The Thermo Scientific LESA (Light Element Slurry Analyzer) provides accurate, real-time elemental analysis of slurry streams for optimization of the beneficiation process. Designed specifically for the iron ore industry, the LESA utilizes the Prompt Gamma Neutron Activation Analysis (PGNAA) measurement technique enabling it to measure lighter elements including silica (Si) that traditionally can not be measured by XRF.
Product Detail
By accurately analyzing your slurry streams, the LESA will enable you to optimize recovery and reduce reagent consumption. The LESA can also be used to provide metallurgical accounting information when used in conjunction with a SamStat-20C continuous sampling station. This integrated solution is the most cost effective way of achieving accurate metallurgical sampling for the iron ore industry.
By using PGNAA technology, the LESA has been proven to measure problematic light elements such as Al, Si, K, S, Na, Mg, & Cl. The ability to measure gangue material such as silica, alumina or magnesium as well as many of the heavier elements including Fe makes this a valuable tool for iron ore plants.
The LESA is available in a single stream configuration for analysis of a critical stream or can measure up to eight streams with a multiplexer. Fixed slot samplers are located on the multiplexer feed to allow the collection of shift composite samples. De-aeration of frothy process streams is also achieved by the multiplexer to ensure a high level of accuracy.
The Light Element Slurry Analyzer features digital signal processing and can now be linked to your plant network via either copper or fibre cables, with copper cables then used to connect to the Central PC. The Central PC will receive assay information and is used to make changes to process operations.
Analyzer Performance:
Number of streams: 1-4 with multiplexer (8 max. under favorable conditions)
Analysis time per stream: 2-15 minutes, application dependent
Sample flow rate: from 1 to 20 m3/hr
Detection system: Nal scintillation
Accuracy: Typical results are shown in the table below
enclosure, 230 Volts AC ±10%, 50 or 60 Hz. Multiplexer and pump: factory selectable 380/415/440/460 Volts AC ±10%, 3-phase, 48-62 Hz ±2Hz (3 wire plus earth). Power Consumption: 4-stream, max. 8 kW.
Air :
For multilplexer pneumatics. Instrument Quality Air (clean and dry to 0.1 microns with dew point <2°C). Pressure nominally 600 kPa (87psi), 500 to 800 kPa acceptable. Consumption: 50 litres per hour at working pressure.
Water :
Clean plant water. 300 – 800 kPa at 15 litres per minute, intermittently for pipe flushing.
Radioisotope Source Standards :
Cf-252 neutron source, typically 21 micrograms. Radiation shielding designed to IAEA safety standards. Electrical rating: IP66, NEMA 4. Quality assurance: ISO 9001.
Environment :
Measured media temperature 0-60°C, Electronics ambient temperature -30-60°C.
Communication: Electronics Enclosure to Operator Console (customer supplied) :
RS-422 twisted-shielded pair cable (Belden #8104 or equivalent) 2,000 ber Optic 62.5/125 multimode (minimum of 2 fibers) 4,000 m (2.49 miles) maximum; Wireless options available
Communication: Operator Console to Customer Control System (customer supplied) :
OPC client/server link, major communication protocols, ODBC
Off-site Modem :
One data-quality phone line or VPN internet link.
Dimensions and Weights :
Four-stream multiplexer :
2700 (106.3) Length mm (inches); 1360 (53.5) Width mm (inches); 1950 (76.8) Height mm (inches); 1500 (3307) Weight kg (lb)
Analyzer :
1850 (73) Length mm (inches); 1600 (63) Width mm (inches); 2080 (82) Height mm (inches) 3200 (7000) Weight kg (lb)
Circulation Pump :
1500 (59.1) Length mm (inches); 850 (33.5) Width mm (inches); 960 (37.8) Height mm (inches); 300 (661.4) Weight kg (lb)
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