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MEI Online: Gravity Concentration: Latest News: September 30th 2010


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:: InLine Pressure Jig Coal Separator Results

Elsa Consulting Group and ACIRL have been lead project managers on an ACARP sponsored research project investigating the application of the InLine Pressure Jig Coal Separator (IPJ-CS) for the Australian coal industry.

The research has been focussed on the potential of the IPJ-CS to treat -6 mm material in Coal Preparation plants with the purpose of debottlenecking and reducing the operating costs associated with heavy media circuits.

The project commenced in 2007 and has been undertaken in three stages.

  • Laboratory Trials - Initial laboratory trials using an IPJ 600 produced spiral-like efficiencies over a size range from 0.25 mm to 6 mm. These results lead to further ACARP funded programmes which included discreet element method (DEM) modelling at the University of New South Wales.
  • CFD-DEM Modelling - Following the first successful programme, CFD-DEM modelling was commenced in the second stage project by Prof Aibing Yu’s group at the University of New South Wales, and validated using the results from the first stage laboratory trials.
  • Small Scale Plant Trials - A skid mounted modular IPJ Coal Separator was fed continuously with 6 mm x 0 raw coal from a Hunter Valley coal preparation plant.

The preliminary results of the trials completed to date confirm that the IPJ-CS is able to achieve good separations at cut points around 1.60 RD and higher. The separations tend to become more efficient as the scale of operation enlargens, that is, not only does unit capacity increase with expanding the InLine Pressure Jig (IPJ) diameter, but efficiency also increases. Also, due to the re-cleaning action of the outer layers of ragging, larger diameter IPJ units would be expected to produce very clean coal products.

As presented in our recent paper delivered at the SME’s XVI International Coal Preparation Congress in Lexington, Kentucky, it is our view that; “The IPJ is a mature technology that has not previously been applied to the coal industry. It efficiently processes a wide range (60 mesh to 11 4 inch or 0.25 to 32 mm) of particle sizes. The IPJ can efficiently process size fractions that include the smaller of those conventionally processed by dense medium cyclones (e.g. 6 x 0.5 mm) and all of those typically processed by spirals or teetered bed separators (2 x 0.125 mm)".

The Gekko IPJ-CS can add significant value to the coal preparation industry by a combination of considerably higher throughputs from existing plant circuitry and efficiency increases by increasing the bottom size passed to dense medium cyclone circuits.

Therefore, it has potentially important applications that include:

  • Higher plant throughputs at minimal costs by increasing desliming apertures to 6 mm (1/4 inch) or higher
  • Scavenging misplaced coal in flotation tails
  • Reprocessing co-disposed areas at the disposal site prior to pumping to plant for flotation
  • Low cost but efficient processing of up to 32 mm (1 1 4 inches ) particles, for example, direct power station feed
  • De-stoning

In summary, research to date indicates that the IPJ-CS, successfully applied, will achieve higher plant throughput and lower operating costs for minimal capital invested. To access a copy of the paper, please contact Mick Alsop (micka@gekkos.com).




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