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Suppression of floatability of pyrite in coal processing by carrier microencapsulation
| 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 | | Flotation | | Microencapsulation | | 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) |
| URI: | http://hdl.handle.net/2115/45380 |
| 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)
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Submitter: 恒川 昌美
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