General Principles

MEP have been supplying mineral washing plant for many years and have used this experience, together with modern construction techniques, to design the modular fine coal treatment plant. The plant comprises seven modules of rigid compact design, fitted with proven equipment which can be easily transported to site and rapidly erected. Moreover, the modular concept of construction ensures the most economical design and hence lower overall costs. Another advantage is that the entire plant can easily be dismantled, moved ad re-erected at a different site.

The MEP Fine Coal Treatment Plant can be used in conjunction with any coarse coal washing system and by increasing the aperture size of the 'Pre-wet' and 'drain and rinse' screens, significant increase in overall production throughout and the washery can be achieved.

 

Process

  1. The underflow from the raw coat screens is pumped at approximately 15% w/w solids to the MEP fourway in-line cyclone manifold. The excess water and minus 63 micron material is overflowed and piped to the thickeners. The cyclone underflow feeds a MEP TBS Hydrosizer.
  2. The TBS Hydrosizer is hindered settling classifier using upward current to create a zone of teeter to seperate the coal from the rejects. The density in the machine is constantly monitored and automatically controlled to give an accurate separation. The density of separation can be adjusted to vary the ash content of the clean coal.
  3. The low ash coal overflows the TBS Hydrosizer with the fine shale and the majority of the water and reports by gravity to the secondary cyclone.
  4. High ash shale is rejected through the spigot valves in the base of the machine, and is collected in the effluent sump and subsequently pumped to the thickeners.
  5. Upward current water is provided by a pump from a sump with a level controller to maintain a constant head of water.
  6. The water is pumped at a constant pressure and volume to the TBS Hydrosizer, creating the necessary teeter bed within a vessel.
  7. The TBS Hydrosizer product from the overflow is pumped to a Secondary Cyclone where it is de-slimed.
  8. The underflow passes over a Sieve Bend, which further de-slimes and de-waters the coal.
  9. The coal is then fed by gravity to a MEP/CMI fine-coal slurry centrifuge, which completes the de-watering and provides a low surface moisture product which is added to the coarse coal.
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