An ACARP sponsored research project is currently underway to investigate the application of Gekko Systems InLine Pressure Jig Coal Separators within the Australian coal industry and the implications and benefits it's use may have.
The research has been focussed on the potential of the InLine Pressure Jig Coal Separator 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 research project commenced in 2007 and has been undertaken in three stages; laboratory trials, CFD-DEM modellilng, and small scale plant trials.
Initial laboratory trials using an InLine Pressure Jig 600 produced spiral-like efficiencies over a size range from 0.25 mm to 6 mm. These results lead to further research programmes which included discreet element method (DEM) modelling at the University of New South Wales.
Following the first successful programme, CFD-DEM modelling was commenced in the second stage project by a group at the University of New South Wales, and was validated using the results from the first stage laboratory trials.
In the smalls cale plant trials, a skid mounted modular InLine Pressure Jig 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 InLine Pressure Jig Coal Separator 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 largens, that is, not only does unit capacity increase with expanding the InLine Pressure Jig diameter, but efficiency also increases.
Additionally, due to the re-cleaning action of the outer layers of ragging, larger diameter InLine Pressure Jig units would be expected to produce very clean coal products.
The InLine Pressure Jig is a mature technology that efficiently processes a wide range of particle sizes. The InLine Pressure Jig 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 InLine Pressure Jig Coal Separator can add significant value to the coal preparation industry by increasing efficiency and throughputs from existing plant circuitry and by increasing the bottom size passed to dense medium cyclone circuits.
Due to these values, InLine Pressure Jig Coal Separators have potentially important applications within the Australian coal industry including:
- higher plant throughputs at minimal costs by increasing desliming apertures to 6mm 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 32mm particles, for example, direct power station feed