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2011-Sustainable Industrial Processing Summit
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| Editors: | Florian K |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2012 |
| Pages: | 828 pages |
| ISBN: | 978-0-9879917-0-6 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
De-oxidation Of TiOx Melt With Al And CaAl/Ca2Al Alloys
Krzysztof Borowiec1;1RIO TINTO, Tracy, Canada;
Type of Paper: Regular
Id Paper: 269
Topic: 4
Abstract:
Reduction of TiOx melts with Al and CaAlK. BorowiecRio Tinto Iron & Titanium Inc., CanadaA partial reduction of TiOx with Al was carried out to produce sinters of TiO, Ti3O2 or Ti2O by using increasing ratios of Al/Ti in the starting mixture. These sub-oxides were further de-oxidized by Ca-Al alloy. Different de-oxidation parameters for chosen Ti sub-oxides led to alloy containing of Ti or Ti3Al + Ti with dissolved oxygen level in the range of 0.20% – 0.80wt%. These alloys were separated from slag saturated in 2CaO×Al2O3. The reduction of TiOx melts with Al at 1750oC led to poor phase separation and excessive contamination of Ti aluminide with dissolved oxygen and secondary Al2O3 inclusions. A significant improvement in the phase separation and a level of dissolved oxygen in Ti aluminide was achieved by fluxing of TiOx melt with CaO or CaO/CaF2 prior to or after reduction. This way, the level of dissolved oxygen in the solidified Ti-aluminides dropped to 1-2% range. Preliminary tests were carried out on de-oxidation of these alloys with Ca-Al alloy.