鉴于传统采矿的巨大影响,根据循环经济的原则,从危险废物材料中回收稀土元素(REE)可能成为未来的选择。在这项工作中,已使用电动辅助的黑麦草(LoliumperenneL.)进行了从金属尾矿中回收稀土元素的技术可行性研究。将植物提取与AC电流和具有反向极性的DC电流相结合(1Vcm-1,8hday-1)应用于含有总浓度REE(Sc,Y,La,Ce,Pr,和Nd)约为146mgkg-1。REE地球化学分馏及其在土壤孔隙水中的浓度变化表明,由植物和电流引起的REE动员;联合电动辅助植物提取处理的REE利用率提高了更高的程度,表明植物在该过程中的相关作用。我们的结果表明了最初的假设,即通过植物提取从真正的金属采矿废物中回收稀土是可行的,并且通过施加电流可以显着改善该技术的性能。尤其是AC型,与不施加电场的处理相比,黑麦草中的REE积累增加了57-68%。
Given the high impact of traditional mining, the recovery of rare earth elements (REEs) from hazardous waste materials could become an option for the future in accordance with the principles of the circular economy. In this work, the technical feasibility of REEs recovery from metal mine tailings has been explored using
electrokinetic-assisted phytoremediation with ryegrass (Lolium perenne L.). Phytoextraction combined with both AC current and DC current with reversal polarity was applied (1 V cm-1, 8 h day-1) to real mine tailings containing a total concentration of REEs (Sc, Y, La, Ce, Pr, and Nd) of around 146 mg kg-1. Changes in REEs geochemical fractionation and their concentrations in the soil pore water showed the mobilization of REEs caused by plants and electric current; REE availability was increased to a higher extent for combined
electrokinetic-assisted phytoextraction treatments showing the relevant role of plants in the process. Our results demonstrated the initial hypothesis that it is feasible to recover REEs from real metal mining waste by phytoextraction and that the performance of this technology can be significantly improved by applying electric current, especially of the AC type, which increased REE accumulation in ryegrass in the range 57-68% as compared to that of the treatment without electric field application.