Coal flotation washability: Development of an advanced procedure

M. K. Mohanty, R. Q. Honaker, K. Ho

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


A modified coal flotation characterization procedure, referred to as the Advanced Flotation Washability (AFW) technique, has been developed which, compared to traditional procedures, provides a more accurate prediction of the optimum separation performance achievable by a froth flotation process. The AFW procedure uses a batch-operated flotation column packed with corrugated plates which provides enhanced selectivity among particles of varying degrees of hydrophobicity due to a selective bubble-particle detachment mechanism. This mechanism is more pronounced in a flotation column operating under carrying-capacity limited condition with a deep froth zone. In addition, the plug-flow environment resulting from the apparent high length-to-diameter ratio provides an improved performance over the near perfectly-mixed conventional cells used in the traditional procedures. The separation performance provided by the AFW procedure was superior to that obtained from multiple stage cleaning provided by commercially-available flotation columns under both kinetic and carrying-capacity limiting conditions. The separation performance improvement provided by the AFW technique has been illustrated using three different coal samples having varying feed characteristics.

Original languageEnglish
Pages (from-to)51-67
Number of pages17
JournalCoal Preparation
Issue number1-2
StatePublished - 1998

Bibliographical note

Funding Information:
The work presented in this publication was funded in part by grants made possible by the U. S. Department of Energy Cooperative Agreement Number DE-FC22-92PC92521 (Year 4) and the Illinois Department of Commerce and Community Affairs through the Illinois


  • Coal flotation
  • Column flotation
  • Flotation characterization
  • Froth
  • Reflux
  • Selective detachment

ASJC Scopus subject areas

  • Fuel Technology
  • Geotechnical Engineering and Engineering Geology


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