Recovery of vanadium from calcification roasted-acid leaching tailing by enhanced acid leaching
Recovery of vanadium from calcification roasted-acid leaching tailing by enhanced acid leaching
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DOI：
10.1016/j.jhazmat.2019.02.081
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发表时间：
2019-05-05
影响因子：
13.6
通讯作者：
Zhang, Weiguang
中科院分区：
文献类型：
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作者：
Zhang, Ying;Zhang, Ting-An;Zhang, Weiguang
典型的钙焙烧-酸浸工艺所产生的含钒尾矿是一种污染物和资源浪费。为了从钒尾矿中回收钒，改善尾矿的环境质量，进行了常压浸出和加压浸出的对比研究。设计正交试验并应用于大气浸出研究。结果表明，在变大气浸出条件下，V的浸出率从29.6%提高到43.5%，Fe、Cr、Ti、Mg的浸出率在4%左右保持稳定。在加压浸出试验中，考察了浸出温度、H2SO4浓度、液固比和浸出时间对钒、铁、钛浸出的影响。在最佳条件下（温度为413.15 K， H2SO4浓度为300 g/L，液固比为8:1 mL/g，反应时间为100 min）， V、Fe和Ti的提取率分别达到91.7%、60.1%和46.5%，浸出渣中稳定钒的含量仅为0.13%。
Vanadium contained tailing generated from the typical calcium roasting-acid leaching process is contaminant and waste of resource. Atmospheric and pressurized leaching were conducted and compared to recover the vanadium from the vanadium tailing and improve the tailing's environmental quality. Orthogonal experiments were designed and applied for the atmospheric leaching study. It is shown that the extraction efficiency of V changed from 29.6% to 43.5% while the extraction efficiency of Fe, Cr, Ti, Mg remained stable under 4% with variable atmospheric leaching conditions. In the pressurized leaching experiments, the effects of leaching temperature, H2SO4 concentration, liquid to solid ratio and leaching time on the extraction of V, Fe, and Ti were investigated. Under the optimum conditions (the temperature of 413.15 K, H2SO4 concentration of 300 g/L, liquid to solid ratio of 8:1 mL/g and the reaction time of 100 min), the extraction efficiencies of V, Fe, and Ti reached 91.7%, 60.1% and 46.5% respectively, a leach residue contains only 0.13% of stable vanadium was obtained.