Ecofriendly Selective Extraction of Vanadium from Vanadium Slag with High Chromium Content via Magnesiation Roasting–Acid Leaching

Conventional vanadium (V) extraction methods for vanadium-bearing slags create high chromium content discharge Cr(VI)-containing hazardous wastes. In this article, an ecofriendly magnesiation roasting-acid leaching method is proposed to selectively extract V from the slag. In the near-zero discharge...

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Bibliographic Details
Published in:Metallurgical and materials transactions. B, Process metallurgy and materials processing science Process metallurgy and materials processing science, 2022-02, Vol.53 (1), p.604-616
Main Authors: Li, Hong-Yi, Cheng, Jie, Wang, Cheng-Jie, Shen, Shuo, Diao, Jiang, Xie, Bing
Format: Article
Language:English
Subjects:
Acid leaching
Ammonia
Ammonium sulfate
Calcification
Carcinogens
Characterization and Evaluation of Materials
Chemical precipitation
Chemistry and Materials Science
Chromium
Discharge
Hazardous wastes
Liquor
Magnesium oxide
Materials Science
Metallic Materials
Metallurgy
Nanotechnology
Original Research Article
Precipitates
Roasting
Silicon dioxide
Slag
Sodium
Structural Materials
Surfaces and Interfaces
Thin Films
Vanadium
Water reuse
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Summary:Conventional vanadium (V) extraction methods for vanadium-bearing slags create high chromium content discharge Cr(VI)-containing hazardous wastes. In this article, an ecofriendly magnesiation roasting-acid leaching method is proposed to selectively extract V from the slag. In the near-zero discharge process the generation of Cr(VI) is eliminated. Cr present as (Fe 0.6 Cr 0.4 ) 2 O 3 in the leach residue in association with Fe 2 O 3 and SiO 2 can be directly smelted to produce ferrochrome. From the obtained leach liquor, V, Mg and Mn are recovered successively. At pH 3.0, V precipitates as ammonium polyvanadate, which is calcined to V 2 O 5 (99.14 pct pure) with a total recovery rate of 94.10 pct. Meanwhile, the NH 3 gas produced during calcination is recycled for pH adjustment. At pH 8 to 9, Mn precipitates as hydroxide and is calcined to produce a MnO by-product (91.10 pct pure; recovery rate 47.96 pct). Subsequently, at pH 10 and above, dissolved Mg is precipitated as Mg(OH) 2 and calcined to obtain MgO (purity = 99.12 pct; recovery = 90.47 pct). The calcine MgO is recycled as a roasting additive. The evaporation of residual solution yielded (NH 4 ) 2 SO 4 crystals and condensed water, which are recycled in vanadate precipitation and acid leaching, respectively. Graphical abstract
ISSN:1073-5615
1543-1916
DOI:10.1007/s11663-021-02402-4