This paper proposed a novel roasting process of extracting vanadium from high chromium vanadium slag. In this process, the high chromium vanadium slag was treated by NaOH-NaNO binary sodium salts, roasted in microwave heating furnace, and leached by water. During the roasting process, the temperature and time took a significant role in the conversion of vanadium and chromium. This novel microwave roasting was able to improve heating speed, accelerate the oxidization and decomposition of slag, and shorten the roasting time, compared with conventional muffle roasting. Under the optimum microwave roasting conditions (1 NaOH/NaNO mass ratio, 450 ℃ roasting temperature, and 10 min roasting time), the leaching rates of vanadium and chromium were 94.11% and 90.81%, respectively. In the leaching process, the reaction mechanism for the water leaching process was proposed. The process showed that leaching time and sample size played a significant role, while leaching temperature and liquid-to-solid ratio showed no obvious effect. The leaching residue analysis showed the major mineralogical phases were FeO, NaTiO, NaFeSiO, and a small amount of polymeric substance ((Mn,Ca)(Fe0.6,Cr0.4)O·nSiO).
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| http://dx.doi.org/10.1016/j.jhazmat.2019.120805 | DOI Listing |
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