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Suppression of floatability of pyrite in coal processing by carrier microencapsulation

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Title: Suppression of floatability of pyrite in coal processing by carrier microencapsulation
Authors: Jha, Rani Kumari Thakur Browse this author
Satur, Jacqueline Browse this author
Hiroyoshi, Naoki Browse this author
Ito, Mayumi Browse this author
Tsunekawa, Masami Browse this author
Keywords: Pyrite
Surface property
Coal processing
Issue Date: May-2011
Publisher: Elsevier B.V.
Journal Title: Fuel Processing Technology
Volume: 92
Issue: 5
Start Page: 1032
End Page: 1036
Publisher DOI: 10.1016/j.fuproc.2010.12.028
Abstract: Carrier microencapsulation, CME, is a technique to form a thin layer of metal oxide or hydroxide on pyrite surface using a water soluble organic carrier combined with metal ions. The present study investigated the effect of CME using a tris-catecholato complex of Si4+, Si(cat)_[3]^[2-] on pyrite-coal separation by dynamic bubble pick-up experiments and Hallimond tube flotation experiments using coal, pyrite, and a coal-pyrite mixture. The mineral samples were treated in 0-5 mol m^[-3] Si(cat)_[3]^[2-] solutions at pH 4-9 at treatment times of 1-24 h. Dynamic bubble pick-up experiments showed that CME treatment converted the pyrite surface from hydrophobic to hydrophilic but did not affect coal's hydrophobic surface. The results of the Hallimond tube flotation experiments of a coal-pyrite mixture at pH 7-9 in the presence of kerosene as a collector showed that pyrite floatability was selectively suppressed after 1 h CME treatment with 0.5 mol m^[-3] Si(cat)_[3]^[2-] while both coal and pyrite were floated without the treatment. Thus indicates that CME treatment is effective in suppressing pyrite floatability in coal-pyrite flotation.
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 恒川 昌美

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