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Electrolytic preparation and characterization of VCr alloys in molten salt from vanadium slag
- Source :
- Journal of Alloys and Compounds. 803:875-881
- Publication Year :
- 2019
- Publisher :
- Elsevier BV, 2019.
-
Abstract
- Vanadium slag contains several critical elements like V, Ti, Cr, Fe and Mn. In our previous work, V and Cr have been enriched by selective chlorination, increasing from 10.05% to 14.95% and 5.84%–8.69% separately. V and Cr still maintain the trivalence state in molten salt. In the current work, the electrodeposition behaviors of V3+ and Cr3+ in NaCl–KCl molten salt at 800 °C were investigated using cyclic voltammetry (CV) and square wave voltammetry (SWV) with a tungsten electrode. It was found that the reduction processes of V3+ and Cr3+ consist of two steps, M3+/M2+, M2+/M. The diffusion coefficients of V3+ and Cr3+ in NaCl–KCl molten salt were measured by CV. The effect of VCl3/CrCl3 mass ratio on VCr alloy was investigated by a two-electrode under constant voltage. Pure Cr can be obtained at 2.8 V in the NaCl–KCl molten salt, while VCr alloy (3.71 mass % V-94.28 mass% Cr-2.01 mass % O) was obtained when electrolysis voltage was controlled to 2.8 V at 800 °C. The composition of VCr alloy can be designed by changing the molten salt composition. This method can be applied for direct preparation of VCr alloy from vanadium slag, thus offering the use of low cost raw materials with direct environmental benefits.
- Subjects :
- Materials science
Diffusion
Inorganic chemistry
Alloy
Vanadium
chemistry.chemical_element
02 engineering and technology
Electrolyte
engineering.material
010402 general chemistry
01 natural sciences
law.invention
law
Materials Chemistry
Molten salt
Electrolysis
Mechanical Engineering
Metals and Alloys
Slag
021001 nanoscience & nanotechnology
0104 chemical sciences
chemistry
Mechanics of Materials
visual_art
visual_art.visual_art_medium
engineering
Cyclic voltammetry
0210 nano-technology
Subjects
Details
- ISSN :
- 09258388
- Volume :
- 803
- Database :
- OpenAIRE
- Journal :
- Journal of Alloys and Compounds
- Accession number :
- edsair.doi...........76a902c8555f3116b03735fb22339e93