Journal
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
Volume 23, Issue 5, Pages 1489-1500Publisher
ELSEVIER
DOI: 10.1016/S1003-6326(13)62621-7
Keywords
vanadium slag; spinel; sub-molten salt method; kinetics analysis; decomposition; activation energy
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Funding
- National Basic Research Development Program of China [2013CB632605]
- National Natural Science Foundation of China [51274178, 51274179]
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A novel process was developed for the decomposition of vanadium slag using KOH sub-molten salt under ambient pressure, and the effects of reaction temperature, alkali-to-ore mass ratios, particle size, and stirring speed on vanadium and chromium extraction were studied. The results suggest that the reaction temperature and KOH-to-ore mass ratio are more influential factors for the extraction of vanadium and chromium. Under the optimal reaction conditions (temperature 180 degrees C, initial KOH-to-ore mass ratio 4:1, stirring speed 700 r/min, gas flow 1 L/min, and reaction time 300 min), vanadium and chromium extraction rates can reach up to 95% and 90%, respectively. Kinetics analysis results show that the decomposing process of vanadium slag in KOH sub-molten salt can be well interpreted by the shrinking core model under internal diffusion control. The apparent activation energies for vanadium and chromium are 40.54 and 50.27 kJ/mol, respectively.
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