Dissolution Behavior of Vanadium from Vanadium-bearing Steel Slag in KOH Sub-molten Salt
GAO Ming-lei CHEN Dong-hui LI Lan-jie DU Hao ZHENG Shi-li
Vanadium and Titanium Engineering Technology Research Center, Chengde Iron and Steel Group Co.Ltd., HeBei Iron and Steel Group Co.Ltd. Vanadium and Titanium Engineering Technology Research Center, Chengde Iron and Steel Group Co.Ltd., HeBei Iron and Steel Group Co.Ltd. Research Center of Vanadium and Titanium Engineering Technology, Chengde Iron and Steel Group Co. LTD Institute of Process Engineering, Chinese Academy of Sciences Institute of Process Engineering, Chinese Academy of Sciences
Abstract：The dissolution behavior of vanadium from vanadium-bearing steel slag was studied by decomposing the slag with KOH sub-molten salt. The influential factors of reaction temperature, reaction time and alkali-to-slag ratio were examined for obtaining the optimum reaction conditions of vanadium leaching. And the dissolution process mechanism was also investigated. The experimental results show that the leaching rate of vanadium increased with the three factors. The phases of Ca2SiO4, Ca3SiO5, Ca2Fe2O5 in the slag would disappear, and the soluble K3VO4 and dissoluble Ca(OH)2 would be produced when the steel slag was dissolved by KOH sub-molten salt. The sedimentation effect of CaO to vanadium could be avoided by controlling the concentration of KOH. The leaching rate of vanadium was higher than 90% with the reaction temperature from 220 to 240℃, reaction time at 1 h, and mass ratio of alkli to slag at 4. Compared with traditional high-temperature calcination, the energy consumption of this dissolution process was reduced obviously, and dissolution rate was increased.
2011, Vol. 11 
