International Journal of Minerals Metallurgy and Materials
·
2021
·Vol. 28
·期 6
·974-980
·
IF 2.232
Guo Yun,Li Hong-yi,Yuan Yi-heng,Huang Jie,Diao Jiang,Li Gang,Xie Bing
The fusion of the leaching and purification processes was realized by directly using microemulsion as the leaching agent. The bis-(2-ethyhexyl) phosphoric acid (DEHPA)/ n -heptane/NaOH microemulsion system was established to directly leach vanadates from sodium-roasted vanadium slag. The effect of the leaching agent on the leaching efficiency was investigated, in addition to the molar ratio of H 2 O/NaDEHP ( W ), DEHPA concentration, solid/liquid ratio, stirring time, and leaching temperature. In optimal situations, the vanadium leaching efficiency reaches 79.57%. The X-ray diffraction characterization of the leaching residue and the Raman spectrum of the microemulsion before and after leaching demonstrate the successful entry of vanadates from the sodium-roasted vanadium slag into the microemulsion. The proposed method successfully realizes the leaching and purification of vanadates in one step, thereby greatly reducing production costs and environmental pollution. It also offers a new way to achieve the green recovery of valuable metals from solid resources.
研究领域:
冶金学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
STEEL RESEARCH INTERNATIONAL
·
2022
·Vol. 93
·期 7
·2100788
·
IF 2.126
Hongrui Yue,Gongjin Cheng,Jianxing Liu,Xiangxin Xue,Weijun Zhang
This study proposes a clean and effective routine and aims to solve the problems of material accumulation and hypoxia during roasting vanadium slag. The vanadium slag and CaO 2 powders are mixed, briquetted, and roasted at different parameters. The generated phases are Fe 2 O 3 , Fe–Mg oxides, Fe–Ti oxides, Ca 3 (VO 4 ) 2 , silicate, and SiO 2 after roasting. The solid reaction between V 2 O 5 and CaO is described using the vacancy diffusion mechanism. Ca 2+ (or V 5+ ) jumps and diffuses through the Ca 2+ (or V 5+ ) vacancies in the Ca 3 (VO 4 ) 2 layer and subsequently to the Ca 3 (VO 4 ) 2 /V 2 O 5 (or Ca 3 (VO 4 ) 2 /CaO) interface and reacts with V 2 O 5 (or CaO) and O 2 (decomposed from CaO 2 or transported from the air) to generate Ca 3 (VO 4 ) 2 . The vanadium leaching rate is very sensitive to the roasting parameters of CaO/V 2 O 5 molar ratio, temperature, time, and briquetting pressure. A maximum vanadium leaching rate of 98.31% is achieved with a CaO/V 2 O 5 molar ratio of 3/1, with temperature, time, and briquetting pressure being maintained at 900 °C, 50 min, and 10 MPa, respectively. The present routine, which greatly shortens the roasting time, can be realized through a rotary hearth furnace, and is likely to be accepted by both iron works and the environment due to its effective and clean characteristics.
研究领域:
冶金学
·
环境工程
✓ 已验证
DOI
高影响因子
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
·
2022
·Vol. 53
·期 4
·2227-2238
·
IF 2.872
Yue Hong-Rui,Liu Jian-Xing,Cheng Gong-Jin,Xue Xiang-Xin,Zhang Wei-Jun
The material accumulation during roasting in the practical production causes the hypoxia of the internal materials, leading to the relatively lower vanadium recovery than that in theoretical studies. This work aims to solve the problem of material hypoxia through the Na 2 O 2 -briquetting roasting route. The vanadium slag and Na 2 O 2 powders were mixed, briquetted, and roasted at various parameters. The generated phases and their distributions were analyzed using X-ray diffraction, Fourier transform infrared spectroscopy, and electron probe microanalysis. The analyzing results showed that Fe 2 O 3 , Fe 3 O 4 , Mg 0.165 Mn 0.835 O, CaTiO 3 , and Na 3 VO 4 were generated during roasting. The solid–solid reaction between V 2 O 5 and Na 2 O was described using the vacancy-mediated diffusion mechanism. Na + (or V 5+ ), in the Na 2 O (or V 2 O 5 ) layer, jumped and diffused through the Na + (or V 5+ ) vacancies (in the Na 3 VO 4 layer) to the Na 3 VO 4 /V 2 O 5 (or Na 3 VO 4 /Na 2 O) interface. Na + (or V 5+ ) reacted with V 2 O 5 (or Na 2 O) and O 2 decomposed from Na 2 O 2 or transported from the air to generate Na 3 VO 4 . The roasted mixture was leached in an aqueous solution to study the effects of the roasting variables on the vanadium leaching recovery. The vanadium leaching recovery was very sensitive to the roasting variables, it showed very complicated relationships with the Na/V molar ratio, temperature, time, and briquetting pressure. The maximum vanadium leaching recovery of 95.57 pct was achieved when the Na/V molar ratio, temperature, time, and pressure were optimized as 3/1, 850 °C, 2.5 hours, and 5 MPa, respectively. The leaching solution containing vanadium was processed via precipitation and calcination to gather vanadium. The obtained compound was identified as V 2 O 5 with a purity of 96.84 pct, based on the high consistency of diffraction peaks between the present work and that of the joint committee on powder diffraction standards.
研究领域:
冶金学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Separations
·
2022
·Vol. 9
·期 8
·196
·
IF 3.344
Guoquan Zhang,Kun Wang,Mingzhi Luo
The technology of simultaneously recovering V and Ti from vanadium slag via ammonium salt roasting has proven to be an efficient route. However, due to the phase stability and complex chemical composition of vanadium slag, intermediate materials containing Fe, V, Ti and Mn are difficult to be characterized critically. This work aims to investigate the decomposition and transformation of vanadium slag during ammonium salt roasting, using a combination of FT-IR, XRD, XPS and SEM techniques. It was found that the lattice structure of Fe-contained spinel would be transformed from FeV2O4to Fe2+VnFe2−nO4(0 < n < 2) during directly roasting in the air. However, there is no obvious change for Ti-contained and Mn-contained spinel. Using NH4HSO4(ABS) as an additive and roasting the slag in the N2atmosphere, those spinels would be decomposed into various sulfate salts. Meanwhile, when the slag was roasted with NH4HSO4in the air, a part of Fe(II) in (NH4)2Fe(SO4)2would be transferred into Fe(III), but V(III), Ti(IV) and Mn(II) from those salts would remain the same valance state. Ultimately, about 88% V and 81% Ti were recovered, when vanadium slag was roasted at 663.15 K with a 1:5 ratio of slag-to-NH4HSO4and followed by 8 vol.% H2SO4leaching.
研究领域:
冶金学
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）