Coal – sensor sorting is the new way solution

21 November 2014

X-ray Transmission (XRT) is probably one of the most versatile types of sensors. The STEINERT XSS T ‘sees’ through the materials, recognising different material densities, components containing halogens, and organic components. Composite materials and internal adhesions are also detected. Now also available in the new Mobile Sorting Solution

See some recent test examples:

De-stoning of coal from South American deposit

Purpose  -  determine sorting efficiency of X-ray sorter in a de-stoning  application   

  • 200kg - 0 to 100mm Sample
  • 2 drums (60kg) pre-sorted material to train machine
  • Screened -25mm
  • Remaining mixed bulk sample (140kg) sorted on STEINERT XSS T

De-stoning and De-shaling of South African coal

Purpose - determine if valuable coal can be recovered from a reject dump from previously treated coal

  • 400kg Sample
  • > 50% Ash
  • -50mm Screened off
  • Remaining 350kg - divided into 6 batches via “Cone & Quarter” technique
  • Subsample taken and hand sorted to:

    • Coal
    • Rock
    • Shale
    • Pyrite Rich Material 

These samples were used to calibrate the machine and afterwards mixed back in with the bulk sample.

The objective of the test was then agreed to remove anything from the stream that was not coal. Therefore, rock, shale and pyrite rich material would be targeted and removed to reduce ash and sulphur content.

How you will benefit?

  • Very Flexible, Environmentally Friendly, Dry Process
  • Simple to Set-up & Operate
  • Easy & Quick to Adjust
  • Provides Real Time Information – Analysis & Ongoing Optimisation
  • Throughputs can vary greatly with application and PSD (50 to 200 or 400tph)
  • Optimal size -150 +50mm – can sort as small as 10mm
  • 3:1 Size Ratio is optimal
  • Eject on smaller fraction is preferable
  • Accept or Reject Ash and Pyrite levels can easily be adjusted


For more information go to STEINERT Coal solutions or call your closest contact at STEINERT Australia