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Published on: July 3, 2015
Selective leaching of vanadium over iron from vanadium slag
Xuefei Zhang1, Dean Fang1, Shizhe Song1
1School of Metallurgy, Northeastern University, Shenyang 110169, China; Liaoning Key Laboratory of Metallurgical Resources Recycling Science, Shenyang 110169, China.
A novel method uses chromium oxide (Cr2O3) to prevent iron leaching during vanadium (V) extraction from vanadium slag (VS) with sulfuric acid (SA). This significantly improves vanadium recovery and enables byproduct reuse.
Area of Science:
- Metallurgical Engineering
- Materials Science
- Environmental Science
Background:
- Vanadium slag (VS) presents utilization challenges due to iron (Fe) co-leaching during vanadium (V) extraction.
- Separating vanadium from iron in acidic leachates is complex and costly.
Purpose of the Study:
- To develop a comprehensive VS utilization method that inhibits iron leaching during vanadium recovery.
- To enhance the economic viability of vanadium slag processing.
Main Methods:
- Addition of chromium oxide (Cr2O3) to vanadium slag before sulfuric acid (SA) leaching.
- Investigating phase evolution, roasting parameters, and Cr2O3 addition effects on leaching ratios.
- Analyzing leachate composition and recovery of valuable byproducts.
Main Results:
- Cr2O3 addition forms insoluble (Fex,Cr1-x)2O3, significantly reducing Fe leaching.
- With 12 wt.% Cr2O3, vanadium leaching ratio reached 91% with a V:Fe mass ratio of 18.34.
- Low leaching ratios for Fe (1.39%) and Cr (0.28%) were achieved.
Conclusions:
- The proposed method effectively suppresses iron co-leaching, simplifying vanadium recovery.
- Leaching residue is suitable for ironmaking, while separated (Fex,Cr1-x)2O3 and Fe2TiO5 can be used for pigments and TiO2 production.
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