Research on the Removal of Sodium from Vanadium Tailings by Calcification Roasting and NaOH Leaching

Yufeng Guo, Chao Wang, Shuai Wang, Feng Chen, Xueyuan Wang, Zhiwei An and Lingzhi Yang
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Yufeng Guo: School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
Chao Wang: School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
Shuai Wang: School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
Feng Chen: School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
Xueyuan Wang: Chengde Jianlong Special Steel Co., Ltd., Chengde 067399, China
Zhiwei An: Chengde Jianlong Special Steel Co., Ltd., Chengde 067399, China
Lingzhi Yang: School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China

Sustainability, 2022, vol. 14, issue 15, 1-16

Abstract: Vanadium tailings are a common solid waste in the vanadium industry. As they are rich in Fe, vanadium tailings could be a potential raw material for the blast furnace. However, the presence of approximately 4% Na 2 O in vanadium tailings is a major impediment to its return to the blast furnace. A novel method for removing sodium from vanadium tailings by calcification roasting and subsequent NaOH leaching was proposed in this work. The method demonstrated that calcification roasting of vanadium tailings can not only volatilize a part of sodium but also facilitate the dissolution of sodium during the subsequent NaOH leaching process. The thermodynamic analysis and behaviors of vanadium tailings during calcification roasting were systematically investigated. The transformation of sodium-containing phases in vanadium tailings during calcification roasting was studied. Further, the promoting effect of calcification roasting on sodium leaching by NaOH was clarified. The total removal efficiency of sodium was 80.37% under optimal conditions, and the residue obtained after sodium removal can be used as a raw material in the blast furnace process for in-plant recycling.

Keywords: vanadium tailings; sodium removal; calcification roasting; volatilization; leaching (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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