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Selective precipitation of rare earth and critical elements from acid mine drainage - Part II: Mechanistic effect of ligands in staged precipitation process
Resources, Conservation and Recycling ( IF 13.2 ) Pub Date : 2022-09-14 , DOI: 10.1016/j.resconrec.2022.106655
Behzad Vaziri Hassas, Mohammad Rezaee

Recovery of critical elements from secondary resources, such as acid mine drainage (AMD), has been deemed a potential path to support the raw materials needed to support the increasing high-tech and green energy developments. The precipitation patterns of critical elements in AMD treatment ponds differ when NaOH and Na2CO3 are used. In order to determine the reason for the difference in precipitation pattern of REEs and critical elements in these two conditions as well as the prospects of selective recovery of these elements, surface charge, particle size, and formation of the precipitates obtained from the treatment of AMD using a 3-stage precipitation process were studied. It was shown that the REEs surface complexation and co-precipitation with Al precipitates are unlikely. Particle size analysis concluded that the Al and Co-Mn precipitates tend to agglomerate after the initial precipitation of very fine particles. However, no agglomeration of the REE precipitates was observed.



中文翻译:

酸性矿山排水中稀土和关键元素的选择性沉淀-第二部分:配体在分级沉淀过程中的作用

从二次资源中回收关键元素,如酸性矿山排水 (AMD),被认为是支持支持日益增长的高科技和绿色能源发展所需的原材料的潜在途径。当 NaOH 和 Na 2 CO 3时 AMD 处理池中关键元素的沉淀模式不同被使用。为了确定在这两种条件下稀土元素和关键元素的析出模式不同的原因以及这些元素的选择性回收前景、表面电荷、粒度和从 AMD 处理中获得的析出物的形成使用 3 阶段沉淀过程进行了研究。结果表明,REEs 表面络合和与 Al 沉淀物的共沉淀不太可能。粒度分析得出结论,Al 和 Co-Mn 沉淀物在最初沉淀出非常细的颗粒后往往会聚集。然而,没有观察到 REE 沉淀物的聚集。

更新日期:2022-09-14
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