Influence of the redox conditions on the crystallization behavior of anosovite in Ti-bearing titanomagnetite smelting slag

• Main Authors: Zhen Wang, Qingshan Zhu, Han Wang, Haoyan Sun
• Format: Article
• Language: English
• Published: Elsevier 2021-01-01
• Series: Results in Chemistry
• Subjects: Anosovite; Crystallization; Titanium-bearing slag; Reducing condition; Titanomagnetite
• Online Access: http://www.sciencedirect.com/science/article/pii/S2211715621000412

This study investigated the effect of redox conditions on crystallization characteristics of anosovite in Ti-bearing titanomagnetite smelting slag. Under non-reducing conditions, besides anosovite, a part of Ti element was concentrated into rutile. Due to the much smaller particle size (within 10 μm) of rutile than anosovite, anosovite was the better choice for selective liberation and separation, indicating that non-reducing conditions were not adequate. Under reducing condition, anosovite was the only Ti-rich phase and its liberation was excellent as the reduction degree (n(Ti3+)/n(Ti4++Ti3+)) was about 0.25. But when the reduction degree increased to 0.51, the liberation of the anosovite was poor because of the jagged grain boundary of anosovite particle. So from the liberation and separation perspective, reducing condition within a suitable degree was indispensable. In addition, as the redox conditions changed from oxidizing to reducing, the Ti level in the anosovite phase increased from 65.9% to more than 85%. Reducing condition is particularly favorable to increasing the content of TiO2 in anosovite phase. Above all, a moderate reducing condition is a must for upgrading the Ti-bearing titanomagnetite smelting slag enough to be the worth resource.