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- Title
Elemental Distribution Modification Toward Target Calcium Roasting of Vanadium-Bearing Slags.
- Authors
Sun, Yongqi; Ma, Xingyue; Chen, Mao; Ma, Xiaodong
- Abstract
The elemental distributions among various phases in vanadium-bearing slags have been quantified toward high-efficiency separation and extraction by calcium roasting using electron probe X-ray microanalysis. The roles of the roasting conditions were clarified, including roasting temperature, roasting time, and calcium amount. It was found that, with increasing roasting temperature, the V2O5 concentration in the target vanadium-enriched phase, predominantly in a form of 2(Ca,Mn)O·V2O5, decreased along with more SiO2 and Fe2O3 in this phase; while, with increasing roasting time, the V2O5 concentration in the vanadium-enriched phase increased due to a more complete reaction. However, a higher calcium addition induced a lower V2O5 concentration in the vanadium-enriched phase and, therefore, a CaO/V2O5 weight ratio of 0.6 was employed. In addition to the vanadium-enriched phase, the solubilities, especially V2O5 in the SiO2 and Fe2O3 solid solutions under varying roasting conditions, were also identified for a reduction of vanadium loss. Based on those quantitative results, the main principles to target to adjust the elemental distributions among various phases during the calcium roasting of vanadium-bearing slags are discussed toward a low-cost and high-efficiency vanadium extraction.
- Subjects
ROASTING (Metallurgy); VANADIUM; ELECTRON probe microanalysis; CALCIUM; ROASTING (Cooking); SLAG; IRON-manganese alloys
- Publication
JOM: The Journal of The Minerals, Metals & Materials Society (TMS), 2024, Vol 76, Issue 7, p3896
- ISSN
1047-4838
- Publication type
Article
- DOI
10.1007/s11837-024-06603-5