A method for recovery of iron, titanium, and vanadium from vanadium-bearing titanomagnetite

• Published in: International journal of minerals, metallurgy and materials Vol. 25; no. 2; pp. 131 - 144
• Main Authors: Zhang, Yi-min, Wang, Li-na, Chen, De-sheng, Wang, Wei-jing, Liu, Ya-hui, Zhao, Hong-xin, Qi, Tao
• Format: Journal Article
• Language: English
• Published: Beijing University of Science and Technology Beijing 01.02.2018; Springer Nature B.V; Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China%National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Beijing 100190, China; University of Chinese Academy of Sciences, Beijing 100049, China; Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Beijing 100190, China
• Subjects: Anthracite; Ceramics; Characterization and Evaluation of Materials; Chemistry and Materials Science; Composites; Corrosion and Coatings; Glass; Iron oxides; Leaching; Low temperature; Materials Science; Metallic Materials; Natural Materials; Oxidation; Reducing agents; Roasting; Separation; Slag; Sodium; Sodium carbonate; Sodium compounds; Surfaces and Interfaces; Thin Films; Titanium; Tribology; Vanadates; Vanadium; Vanadium oxides; Water chemistry; 钒氧化物;氧化铁;钛;水溶性;金属性;创新方法;低温度;炉渣; water leaching; sodium oxidation; vanadium; recovery; titanomagnetite; direct reduction; smelting separation
• ISSN: 1674-4799; 1869-103X; 1869-103X
• DOI: 10.1007/s12613-018-1556-0

An innovative method for recovering valuable elements from vanadium-bearing titanomagnetite is proposed. This method involves two procedures： low-temperature roasting of vanadium-bearing titanomagnetite and water leaching of roasting slag. During the roasting process, the reduction of iron oxides to metallic iron, the sodium oxidation of vanadium oxides to water-soluble sodium vanadate, and the smelting separation of metallic iron and slag were accomplished simultaneously. Optimal roasting conditions for iron/slag separation were achieved with a mixture thickness of 42.5 mm, a roasting temperature of 1200°C, a residence time of 2 h, a molar ratio of C/O of 1.7, and a sodium carbonate addition of 70 wt%, as well as with the use of anthracite as a reductant. Under the optimal conditions, 93.67% iron from the raw ore was recovered in the form of iron nugget with 95.44% iron grade. After a water leaching process, 85.61% of the vanadium from the roasting slag was leached, confirming the sodium oxidation of most of the vanadium oxides to water-soluble sodium vanadate during the roasting process. The total recoveries of iron, vanadium, and titanium were 93.67%, 72.68%, and 99.72%, respectively.