An Experimental Investigation of the Flotation of Residue Solids from Liquefied Coal

D. Murali, D. Bhattacharyya, R. I. Kermode

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


A semibatch flotation column has been used to investigate the feasibility of separating the mineral ash components from liquefied coal without the addition of a surfactant. The variables studied included the type of foaming gas and its flow rate, the ash concentration, the diffuser pore size, the length of foaming time, and the temperature profile along the column. For a suspension containing 4.6% ash, a separation up to 60% was achieved with a bulk liquid temperature of 110°C and a foam temperature of 65 °C. A temperature gradient between the foam and liquid was essential if separation was to be achieved. The best separation was obtained with a 50-μm average pore size diffuser. Separation using smaller pore size diffusers was more erratic but statistically in the same range. Very poor separation resulted from a 150-μm diffuser.

Original languageEnglish
Pages (from-to)547-563
Number of pages17
JournalSeparation Science and Technology
Issue number7
StatePublished - Sep 1 1978

Bibliographical note

Funding Information:
The funds for this research project were supplied by the National Science Foundation, RANN Division, under grant number AER-03259-A03, and by the State of Kentucky through the Institute for Mining and Minerals Research.

ASJC Scopus subject areas

  • Chemistry (all)
  • Chemical Engineering (all)
  • Process Chemistry and Technology
  • Filtration and Separation


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