Abstract
Technology intensified with surface wettability was introduced to leach vanadium and chromium from converter vanadium slag without roasting. Parameters affecting the leaching efficiency of vanadium and chromium were investigated: sulfuric acid concentration, MnO2-to-slag mass ratio, liquid-to-solid ratio, leaching time, leaching temperature, and sodium dodecyl sulfate (SDS)-to-slag mass ratio. The leaching efficiencies of vanadium and chromium were 33.46 % and 20.02 % higher in the presence of MnO2 and SDS, respectively, compared to the control. The leaching efficiencies of vanadium and chromium were 68.93 % and 30.74 %, respectively, under the optimum conditions: sulfuric acid concentration 40 wt%, MnO2-to-slag mass ratio 10.0 wt%, liquid-to-solid ratio 5:1 mL/g; 12 h; 90 °C; and SDS-to-slag mass ratio 0.25 wt%. The analysis of the reaction mechanism in the leaching process indicates that MnO2 combined with protons (H+) could oxidize low-valent vanadium and chromium; SDS could change the chemical behavior and decrease the surface tension of the aqueous solution to favor MnO2 oxidization.
摘要
介绍一种从转炉钒渣中提取钒和铬的表面浸润强化浸出技术,考察硫酸浓度、二氧化锰(MnO2) 的添加量、液固比、浸出时间、浸出温度以及十二烷基硫酸钠(SDS)的添加量对钒和铬浸出率的影 响。 结果表明:在浸出过程中添加MnO2和SDS,钒和铬的浸出率比未添加时分别高33.46% 和20.02%, 在硫酸浓度40 wt%、反应时间 2.0 h、液固比 5:1 mL/g、反应温度90 °C、MnO2 添加量为10.0 wt% 以及SDS 的添加量0.25 wt%时,钒和铬的浸出率分别为68.93%和30.74%。浸出过程反应机理表明, MnO2 协同H+离子可以氧化低价钒和铬,SDS 能改变溶液表面化学行为,降低溶液表面张力,有利于 MnO2 的氧化。
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Foundation item: Project(2015BAB17B00) supported by the National Key Technology R&D Program of China; Project(CYB15045) supported by the Program for Chongqing University Postgraduates’ Innovation Project, China
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Yang, Qw., Xie, Zm., Peng, H. et al. Leaching of vanadium and chromium from converter vanadium slag intensified with surface wettability. J. Cent. South Univ. 25, 1317–1325 (2018). https://doi.org/10.1007/s11771-018-3828-2
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DOI: https://doi.org/10.1007/s11771-018-3828-2