Selective Chemical Etching of Vanadium Slag Enables Highly Efficient and Clean Extraction of Vanadium

IF 7.1 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Xin-Mian Chen, Hong-Yi Li, Cheng-Chao Wei, Jie Cheng, Jiang Diao, Bing Xie, Fusheng Pan
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Abstract

Vanadium slag with high calcium and phosphorus contents (HCPVS) is considered an inadequate raw material for vanadium extraction. Existing vanadium extraction techniques are incapable of efficiently extracting vanadium from HCPVS due to the severe interference of phosphorus and silicon impurities. This study proposed selective chemical etching to remove phosphorus and silicon prior to vanadium extraction under mild conditions. Results showed that the (Mn,Fe)V2O4 spinels in HCPVS were enveloped by a silicate matrix comprising Ca2SiO4–Ca3(PO4)2 and CaFeSiO4. Chemical etching with 1.5 mol/L hydrochloric acid for 30 min effectively removed the silicate matrix, yielding the etched slag for further processing. The etched slag underwent magnesiation roasting at a Mg/V molar ratio of 1.0 for 60 min at 1173 K. Subsequent leaching with sulfuric acid at pH 3.5 and 313 K for 10 min yielded a vanadium extraction efficiency of 93.2%. V2O5 with a purity of 98.6% was obtained after ammonium precipitation and calcination. The resulting leaching residue and wastewater are recyclable, demonstrating the proposed vanadium extraction process as environmentally friendly and sustainable. This study sheds light on a novel way for sustainable resource extraction from low-grade ores.

Abstract Image

钒渣的选择性化学蚀刻可实现高效、清洁地提取钒
高钙高磷钒渣被认为是一种不适合提钒的原料。由于磷和硅杂质的干扰严重,现有的钒萃取技术无法有效地从HCPVS中提取钒。本研究提出在温和条件下,先进行选择性化学蚀刻去除磷和硅,再萃取钒。结果表明:HCPVS中的(Mn,Fe)V2O4尖晶石被由Ca2SiO4-Ca3 (PO4)2和CaFeSiO4组成的硅酸盐基体包裹;1.5 mol/L盐酸化学蚀刻30 min,有效去除硅酸盐基体,得到刻蚀渣供进一步处理。在1173 K条件下,以Mg/V摩尔比为1.0的镁化焙烧60 min。随后用313 K、pH为3.5的硫酸浸出10 min,钒浸出率为93.2%。经铵态沉淀法煅烧,得到了纯度为98.6%的V2O5。由此产生的浸出渣和废水是可回收的,证明了所提出的钒提取工艺是环保和可持续的。本研究为从低品位矿石中可持续提取资源开辟了一条新途径。
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来源期刊
ACS Sustainable Chemistry & Engineering
ACS Sustainable Chemistry & Engineering CHEMISTRY, MULTIDISCIPLINARY-ENGINEERING, CHEMICAL
CiteScore
13.80
自引率
4.80%
发文量
1470
审稿时长
1.7 months
期刊介绍: ACS Sustainable Chemistry & Engineering is a prestigious weekly peer-reviewed scientific journal published by the American Chemical Society. Dedicated to advancing the principles of green chemistry and green engineering, it covers a wide array of research topics including green chemistry, green engineering, biomass, alternative energy, and life cycle assessment. The journal welcomes submissions in various formats, including Letters, Articles, Features, and Perspectives (Reviews), that address the challenges of sustainability in the chemical enterprise and contribute to the advancement of sustainable practices. Join us in shaping the future of sustainable chemistry and engineering.
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