A Study on Mineral and Sulfur Rejection from Coal Using a Small-Scale Floatation Column

Masahiko Matsukata, Hidekazu Fujimoto, Korekazu Ueyama

Research output: Contribution to journalArticlepeer-review


Floatability of three kinds of coal, Datong, Ensham and Illinois No. 6, was investigated with various superficial gas velocities and additive concentrations in a small-scale flotation column. The orders of both carbonaceous materials recovery and ash rejection were found to be Datong > Ensham > Illinois No. 6. Distribution of hydrophobicity of coal particles was evaluated by means of the film flotation method. The order of the strength of hydrophobicity determined by the film floatation method was in consistent with that of carbonaceous materials recovery and thereby it was confirmed that this method is useful for evaluating floatability of coal qualitatively. It was found that inorganic sulfur can be rejected by column flotation, indicating that a column floatation process can be applied for simultaneous demineralization and desulphurization of coal. The order of pyrite rejection was Ensham > Datong > Illinois No. 6, being different from that of ash rejection.

Original languageEnglish
Pages (from-to)970-979
Number of pages10
JournalNihon Enerugi Gakkaishi/Journal of the Japan Institute of Energy
Issue number11
Publication statusPublished - 1995
Externally publishedYes


  • Column floatation
  • Demineralization
  • Desulphurization
  • Film floatation
  • Hydrophobicity

ASJC Scopus subject areas

  • Energy(all)


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