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MEI Online: General Minerals Engineering: Latest News: April 30th 2002

:: North American Update for P9M Sponsors  

Sponsors of AMIRA Internationalís P9M project met in Montreal earlier this year to hear its latest research advances, including the development of flotation sensing equipment and progress in measuring and modelling wear patterns in grinding mill components.
It was the first time sponsors of AMIRA Internationalís P9 project have met in the Northern Hemisphere.

David Stribley, Business Manager with AMIRA International, said the meeting was a valuable opportunity for sponsors to hear the status of work underway at McGill University, Julius Kruttschnitt Mineral Research Centre (JKMRC) and University of Cape Town.

At Norandaís New Brunswick plant, sponsors saw a demonstration of the flotation sensors developed as part of the project, which measure the size of air bubbles, their distribution and air hold-up. Sponsors also saw the technology developed to measure and model wear patterns in grinding mill components, caused by abrasion, corrosion and impact, at McGill Universityís Mechanical Engineering Department.

AMIRA Internationalís P9 project, Optimising mineral processes through modelling and simulation, is now in its thirteenth phase (P9M). P9 was set up in 1962 to develop an automatic control system for mineral grinding circuits.

P9 research has developed power predictions for crushers and mills, methodology for designing and optimising comminution circuits by computer simulation and many other important technologies used in mineral processing today. More recently, research highlights include the modelling of sedimentation behaviour of solid particles down to a sluice, reported by JKMRC at the meeting in Montreal.

Comminution research highlights reported at the meeting were:

  • understanding the effect of aspect ratio on the flow rate holdup relationship in a SAG mill; at different mill speeds and charge levels
  • validation of load-throughput model for AG/SAG mills
  • optimisation of milling circuit at Navachab Gold Mine
  • data acquisition for DEM milling model validation
  • further validation of tower (verti) mill model
  • the scale-up of high-pressure grinding rolls from lab to industrial scale
  • review of liberation research
  • conceptual modelling of the 3-product cyclone

In flotation, the research highlights were:

  • development of a new method of bubble imaging
  • further development of Jg sensor and application to the Brunswick Mine
  • field trial at Northparkes Mine - comparison of Jg sensors, cell characterisation, circuit modelling
  • FCTR trial at Kambalda Nickel Operation - validation of circuit modelling methodology
  • field trial at Anglo Platinum mini-plant - validation of circuit modelling methodology, effect of grind size on ore floatability
  • preliminary analysis of effect of collector dosage on Rf (unsized basis)
  • model fitting floatability component values (new project)



Click for more info on Flotation '19

Dick Davies
Amira International
Tel: +61 (0)3 9679 9993
Fax: 9679 9900

Mining Journal, March 22, 2002, p.214

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