The Thermo Fisher Scientific Particle Size Monitor PSM-400MPX provides accurate, in-stream particle size distribution analysis of slurries. The PSM will provide real-time analyses on up to 3 streams with 5 particle size fractions measured simultaneously. Streams with distributions varying between p80’s of 290 and 25 micron can be accommodated. With the information from the PSM, plant operators can optimize grinding circuit performance. This will improve final product quality, metal recovery and energy costs.
Product Detail
The Thermo Fisher Scientific Particle Size Monitor PSM-400MPX provides on-line particle size distributions and % solids. The analysis technique is based on ultrasound absorption. This has been used by Thermo companies for over 20 years and is well proven with superior accuracy (0.75% at one sigma). The design is rugged for continuous operation in harsh environments. The analyser requires no dilution (up to 60 % solids) and a large, representative flow passes the transducers.
Traditional grinding circuit control is based on feed rate or power control loops The PSM-400 MPX multipoint analyses enables product size-based grinding circuit control. This allows optimisation of both recovery and throughput.
The PSM system has easy calibration. It has a modern user interface and communication links fully compatible with plant information and control systems.
Thermo has a global network of expert service engineers to support your operations.
The PSM-400 MPX is skid-mounted for easy and quick plant installation. It comprises four main components:
Primary Sampler
The sample conditioner is a vacuum assisted slurry centrifuge for sampling and de-aeration.
The sample analysis module comprises the flow cell for the ultrasonic transducers, a calibration sampler which doubles as a production composite sampler and a system of valves for standardization and by-pass.
The control and display module
On Cyclone Overflow streams, the PSM-400 MPX can be combined with the Analysis and Sampling Station to provide an integrated engineered solution for metallurgical sampling, elemental analysis and particle size analysis.
Features List
The PSM 400 continuously measures and reports:
5 particle size fractions simultaneously
slurry density or % solids
Up to 3 streams with a multiplexer
Period averages, trends and historical data logging.
The PSM 400 can be used in grinding circuits in the following ways:
To detect cyclone disturbances such as blockage and roping in cyclone underflow.
To maximise mill throughput at constant grind size.
To avoid over-grinding and slimes production (due to, for example, change in ore type).
Standard one stream. (Optional 2 or 3 stream multiplexed at extra cost). Up to 5 size fractions and percent solids for each stream may be analyzed. Distributions with top size no greater than 1mm, and P80 of 295 microns (µ) down
Size fractions ranges :
Must be sub-sets of the overall measurement range and can be +295µ down to -8µ.
Sample Flow-rate required :
2.0 – 4.5 m3/h of statistically correct sample from process (e.g. by Reverse Flow Sampler or Thermo “SamStat”). Slurry can be 4 to 60% solids by wt., and solids S.G. of 2.0 to 5.5.
Ultrasonic transmitters :
6 frequencies selected at design stage to suit the process particle-size and % solids range
Accuracy :
Typically 0.75% absolute one sigma at the target grind for both size and percent solids. Note: independent of particle shape, mineralogy and matrix variations.
Utilities Required :
Specifications
Control and Display Module: Electrical Power :
110 to 130VAC; 50/60 Hz; 0.1 kW with water heater off, or 0.8 kW with water heater on.
Instrument Air :
Instrument-quality Air (clean and dry to 0.1 microns with dew point <2°C). Pressure nominally 690kPa (100psi) 450kPa to 800kPa.
Standardisation Water :
Only clean, fresh, potable water may be used, Volume is dependent upon frequency of standardization; normally once per shift, requiring about 12 litres (3 gallons) per day.
Water Flow to eductor/aspirator needs supply at 275-550kPa (40-80 psi) and a flow rate of 2.7 m3/h. (Can be re-circulated as an option).
Communications Links :
Specifications
Internal: PSM-400 to PC :
Each unit requires two pairs of shielded- twisted pair (1.5mm) instrumentation cable. Maximum length 1.0km for point to point current-loop to RS-232 connection.
External: PSM-400 to Control System :
4 to 20mA analog current loops (up to 16 x 12- bit channels)
PC to customer control system and LAN :
Ethernet link using TCP/IP protocol including OPC or EIA RS-232, RS-422 serial lines (MODBUS).
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