Selective extraction of vanadium from pre-oxidized vanadium slag by carbochlorination in fluidized bed reactor. (10th November 2019)

• Record Type: Journal Article
• Authors: Du, Guangchao; Fan, Chuanlin; Yang, Haitao; Zhu, Qingshan
• Is Part Of: Journal of cleaner production. Volume 237(2019)
• Publication Date: 2019-11-10
• Subjects: Vanadium extraction -- Vanadium slag -- Selective chlorination -- Pre-oxidization -- Thermodynamics; Factory and trade waste -- Management -- Periodicals; Manufactures -- Environmental aspects -- Periodicals; Déchets industriels -- Gestion -- Périodiques; Usines -- Aspect de l'environnement -- Périodiques; 628.5
• DOI: 10.1016/j.jclepro.2019.117765
• Languages: English
• ISSNs: 0959-6526

Abstract

Abstract: Most of the vanadium (V) is industrially extracted from vanadium slag, a byproduct in steelmaking, via the sodium roasting-water leaching or calcification roasting-acid leaching process, which usually suffers from environment pollution or decrease in product purity. In this paper, a novel process of vanadium extraction featuring carbochlorination of pre-oxidized vanadium slag with chlorine (Cl2 ) and nitrogen (N2 ) mixture in a fluidized bed reactor was proposed. And the selectivity between vanadium and iron (Fe) in the slag was primarily concerned, due to the high content of the latter in vanadium slag. The thermodynamic analysis reveals that there exists a favorable zone for selective chlorination of V from Fe compounds. Subsequently, carbochlorination experiments were conducted to investigate the influences of chlorination temperature and time, addition amount of petroleum coke and pressure fraction of chlorine on extraction of V and Fe. And 87.47% of V together with 18.79% of Fe can be extracted from the pre-oxidized vanadium slag by chlorination at 650 °C for 120 min with chlorine pressure fraction [ P (Cl2 )/ P (Cl2 +N2 )] = 0.5 and petroleum coke mass fraction in raw materials for chlorination R c = 10%. The results demonstrate that the selective chlorination process has good potential to recover vanadium from vanadium slags in efficient and clean ways. Graphical abstract: Image 1019605 Highlights: Fluidized carbochlorination of pre-oxidized vanadium slag is first reported. Selective extraction of V from Fe in pre-oxidized vanadium slag can be realized. It provides new insights of efficient and clean production for vanadium industry.