Enhanced column flotation performance for fine coal cleaning

R. Q. Honaker, M. K. Mohanty

Research output: Contribution to journalArticlepeer-review

36 Scopus citations

Abstract

Past studies have found that the froth flotation process is efficient in recovering heavy middling particles, which negatively affects the recovery-grade curve achieved for fine coal recovery. Experimental and theoretical results indicate that the recovery of middling particles can be reduced from 25% to 10% using flotation columns in a multi-stage cleaning approach, thereby improving the overall separation performance. Tests conducted on a -48 mesh coal sample found a 7% improvement in mass yield using a rougher-cleaner column circuit while producing a flotation concentrate containing 8% ash. Similar findings were obtained from the treatment of a -65 mesh coal sample using a different flotation column technology. To fundamentally evaluate the use of multi-stage cleaning, a continuous column model has been developed which incorporates selective and non-selective froth drop-back, and feed component flotation kinetics. For kinetic rate limiting conditions, separation performance was found to substantially improve with the use of multi-stage cleaning, which agrees with the experimental findings. Under carrying capacity conditions, the improvement is a function of the degree of selectivity in the detachment process. Economic justification of the use of multi-stage column treatment must be based on enhancements in product grade and/or mass yield.

Original languageEnglish
Pages (from-to)931-945
Number of pages15
JournalMinerals Engineering
Volume9
Issue number9
DOIs
StatePublished - Sep 1996

Keywords

  • Coal
  • Column flotation
  • Flotation froths
  • Flotation kinetics
  • Simulation

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Chemistry (all)
  • Geotechnical Engineering and Engineering Geology
  • Mechanical Engineering

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