2016-Sustainable Industrial Processing Summit
SIPS 2016 Volume 9: Molten Salts and Ionic Liquids, Energy Production
| Editors: | Kongoli F, Gaune-Escard M, Turna T, Mauntz M, Dodds H.L. |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2016 |
| Pages: | 390 pages |
| ISBN: | 978-1-987820-24-9 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Low temperature electroreduction of ilmenite ore in LiCl molten salt
Vladislav Ri1; Bung Uk Yoo2; Hayk Nersisyan3; Jong Hyeon Lee4;1CHUNGNAM NATIONAL UNIVERSITY, Daejeon, Korea (Republic of [South] Korea); 2PH.D. STUDENT, Daejeon, Korea (Republic of [South] Korea); 3GRADUATE SCHOOL OF DEPARTMENT OF ADVANCED MATERIALS ENGINEERING, CHUNGNAM NATIONAL UNIVERSITY, Daejeon, Korea (Republic of [South] Korea); 4RASOM, CHUNGNAM NATIONAL UNIVERSITY, Daejeon, Korea (Republic of [South] Korea);
Type of Paper: Regular
Id Paper: 369
Topic: 13
Abstract:
Ferrotitanium alloy is prepared by either melting of metallic iron and titanium with predetermined ratio or thermite process from ilmenite ore with Al powder as a reducing agent. The former could produce higher purity ferrotitanium than the latter since part of aluminum is contaminated as a titanium aluminide during the combustion reaction. However, the thermite process occupies significant portion of ferrotitanium production because ilmenite is able to be directly utilized without complicate chemical treatment. In this study electroreduction process was used to produce ferrotitanium in LiCl-Li2O electrolyte which is relatively low temperature molten salt. In this electrochemical reduction process at low temperature of 625 ◦C, ilmenite minerals at the cathode reduced to ferrotitanium alloy through several steps. The reduction step involved the exfoliation of ilmenite powder into flake, simultaneous iron oxide reduction and formation of ferrotitanium alloy with titanium oxide reduction. The reduction ratio of ilmenite to ferrotitanium alloy found to be more than 99% and closed recycle of Li2O was confirmed by the observation of its concentration monitoring in the electrolyte. The reduction mechanism was verified by using electrochemical analysis, such as SEM, EDX and XRD.