Particle motion observed inside a laboratory-scale Knelson Concentrator using positron emission particle tracking

Research output: Chapter in Book/Report/Conference proceedingConference contribution


  • Darryel Boucher
  • Raymond Langlois
  • Kristian Waters
  • Neil Rowson

Colleges, School and Institutes

External organisations

  • McGill University


The Knelson Concentrator is a centrifugal gravity concentrator composed of a high speed rotating bowl into which a mineral slurry is fed. The rotational motion creates a centrifugal acceleration up to an equivalent of 200 G. Under this acceleration, particles enter fluidised riffles along the side of the bowl, with the fluidisation allowing for the substitution of dense material for less dense. The separation mechanism is not fully understood and questions remain on the optimal residence time, slurry feed parameters and bowl surface profile to achieve a better separation. The positron emission particle tracking (PEPT) technique has been applied to record the motion of a -1700+1180 μm particle of a quartz-gold matrix, labelled with 18F radioisotope while it undergoes concentration inside a 3" laboratory scale Knelson Concentrator (KC-MD3) operated at 60 G. The slurry used was composed of quartz and magnetite. Particle trajectories during the first stage of the concentration process where the heavier particles centrifuge through the increasingly dense slurry towards the riffles of the bowl are shown with respect to time. This work reveals new information on particle motion inside the Knelson Concentrator and the results will be used for validation of developed separation model as well as optimisation of a centrifugal concentrator's performance.


Original languageEnglish
Title of host publicationIMPC 2014 - 27th International Mineral Processing Congress
Publication statusPublished - 2014
Event27th International Mineral Processing Congress, IMPC 2014 - Santiago, Chile
Duration: 20 Oct 201424 Oct 2014


Conference27th International Mineral Processing Congress, IMPC 2014