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Efficient separation of rare earths recovered by a supported ionic liquid from bauxite residue leachate

机译：由支撑离子液体从铝土矿残留渗滤液中回收稀土的有效分离

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摘要

Bauxite residue (BR) contains substantial concentrations of rare-earth elements (REEs), but their recovery is a challenge. Acidic BR leachates typically comprise much higher concentrations of base elements (g L-1) than those of the REEs (ppm). Thus, adsorbents that are highly selective for the REEs over the base elements are required for the separation. The novel supported ionic liquid phase (SILP) betainium sulfonyl(trifluoromethanesulfonylimide) poly(styrene-co-divinylbenzene) [Hbet-STFSI-PS-DVB] was evaluated for the uptake of REEs (Sc, Y, Nd, Dy) in the presence of base elements (Ca, Al, Fe) from BR leachates. Breakthrough curves from acidic nitrate and sulfate media were investigated, as both HNO3 and H2SO4 are commonly used for leaching of BR. The SILP exhibited a superior affinity for REEs in both media, except in the case of Sc(III) from the sulfate feed. The recovery rates of the trace amounts of REEs from the real nitrate feed were remarkably high (71.7-100%) via a simple chromatography separation, without requiring complexing agents or a pretreatment for the removal of interfering elements. The REEs were purified from the base elements and separated into three sub-groups (scandium, light REEs and heavy REEs) by an optimized elution profile with H3PO4 and HNO3 in a single chromatographic separation step.
机译：铝土矿残留物（BR）含有大量浓度的稀土元素（REES），但它们的恢复是挑战。酸性Br渗滤液通常包括比REES（PPM）的碱性元素（G L-1）更高的浓度。因此，分离需要对碱基元件的REES具有高度选择性的吸附剂。评价新型支持的离子液相（硅胶）β磺酰基（三氟甲磺酰基亚乙烯）聚（苯乙烯 - 二乙烯基苯）[HBET-STFSI-PS-DVB]，以在存在下摄取REEE（SC，Y，Nd，Dy）来自Br渗滤液的基本元素（CA，Al，Fe）。研究了来自酸性硝酸盐和硫酸盐培养基的突破曲线，因为HNO 3和H 2 SO 4常用于Br的浸出。除了来自硫酸盐饲料的SC（III）的情况外，硅在两种介质中对两个介质的卓越相关。通过简单的色谱分离，实际硝酸盐进料的痕量REES的回收率非常高（71.7-100％），而不需要络合剂或预处理以去除干扰元件。从基础元件中纯化REES并通过优化的洗脱曲线与H3PO4和HNO3中的优化洗脱曲线分离成三个亚组（钪，轻质REEE和重型REEE），在单个色谱分离步骤中。

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  • 来源
    《RSC Advances》 |2018年第22期|共8页
  • 作者

    Avdibegovic Dzenita; Regadio Mercedes; Binnemans Koen;

  • 作者单位

    Katholieke Univ Leuven Dept Chem Celestijnenlaan 200F POB 2404 B-3001 Leuven Belgium;

    Katholieke Univ Leuven Dept Chem Celestijnenlaan 200F POB 2404 B-3001 Leuven Belgium;

    Katholieke Univ Leuven Dept Chem Celestijnenlaan 200F POB 2404 B-3001 Leuven Belgium;

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  • 正文语种 eng
  • 中图分类 化学;
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