화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.45, 241-247, January, 2017
DOI10.1016/j.jiec.2016.09.029  Export Citation
Highly selective separation of vanadium over iron from stone coal by oxalic acid leaching
Pengcheng Hu1, 2, Yimin Zhang1, 2, †, Tao Liu1, 2, Jing Huang1, 2, Yizhong Yuan1, 2, and Qiushi Zheng1, 2
  • 1College of Resources and Environment Engineering, Wuhan University of Science and Technology, Wuhan 430081, PR China
  • 2Hubei Provincial Engineering Technology Research Center of High Efficient Cleaning Utilization for Shale Vanadium Resource, Wuhan 430081, PR China
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In this paper, a novel method was proposed to selectively extract vanadium from stone coal by oxalic acid leaching. Vanadium was leached, but the iron impurity wasmaintained in the leaching residue. The effects of leaching conditions on the leaching efficiency of vanadium and iron were investigated for oxalic and sulfuric acid leaching, respectively. For oxalic acid leaching, 71.5% of the vanadium can be recovered with only 3.4% of the iron impurity leached under the leaching conditions: a dosage of H+ of 12 mol/kg, a leaching time of 6 h, a leaching temperature of 368 K (95 °C) and a water-mineral ratio of 1.5 L/kg. However, under the same conditions, 74.1% of the vanadium and 13% of the iron were leached during sulfuric acid leaching. The XRD and FTIR analyses showed that both oxalic and sulfuric acid leaching can destroy the crystal lattice structure of muscovite, resulting in the leaching efficiency of vanadium without much difference. Further, the SEM-EDS and XPS analyses indicated that very little pyrite dissolved during oxalic acid leaching, but that much more pyrite dissolved during sulfuric acid leaching. Therefore, oxalic acid leaching can achieve a highly selective separation of vanadium over iron from stone coal.
Keywords:Stone coal;Selective leaching;Oxalic acid;Vanadium;Iron
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