Journal
IRONMAKING & STEELMAKING
Volume 39, Issue 2, Pages 147-154Publisher
MANEY PUBLISHING
DOI: 10.1179/1743281211Y.0000000079
Keywords
Nucleation and growth; Kinetics; Spinel crystals; Vanadium slag
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Funding
- National Basic Research Program of China (973 Program) [2007CB613503]
- National High-Tech R&D Program of China (863 Program) [2008AA031104]
- National Natural Science Foundation of China [51090382]
- Chongqing University [CDJZR1130020]
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During its converter extraction process, vanadium is oxidised into vanadium slag and forms spinel crystals. The spinel crystallisation process is one of the most decisive factors in the subsequent extraction and hence is worth exploration and discussion. The classical crystallisation kinetic model presented by Turnbull and Uhlmann was employed to analyse the crystallisation processes of vanadium, chromium and titanium spinel crystals in the vanadium slag. The crystallisation abilities of the three kinds of spinels were quantified and found to follow the order FeCr(2)O(4)>FeV(2)O(4)>Fe(2)TiO(4). Furthermore, the precipitation sequence of spinels in the vanadium slag during cooling was achieved as FeCr(2)O(4)-> FeV(2)O(4)-> Fe(2)TiO(4), and a suitable heat treatment condition on the vanadium slag was proposed. Finally, the optimum temperature range that benefits the precipitation of spinels was obtained as 1507-1557 K by both theoretical calculation and experiment.
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