Rare earth elements (REE) are essential for sustainable energies such as solar and wind power, with rising demand due to the ambitious goal for a circular society. REE are currently mined from virgin ores while REE-rich contaminated soil is left untreated in the environment. Soil remediation strategies are needed that concomitantly cleanup soil and harvest metals that contribute to process circular economy. In this review we aim to (i) define REE concentrations in contaminated soils as well as (ii) identify soil remediation techniques used in remediating REE from soils, emphasizing the ones that extract REE. Current literature lists REE polluted soils in the vicinities of REE mines, coal mines, high traffic roads and agricultural soils (due to REE association with phosphate fertilizers). We first list the conventional separation methods used in the mining industry and their main strategies in extracting/precipitating REE. Solvent extraction is the most commonly conventional method used followed by electrodeposition of REE at high temperatures. We then highlight soil remediation techniques that are used to treat REE. These techniques can be separated into two types: the ones that (a) stabilize REE in soils, and the ones that (b) extract REE from soils. Bioremediation, soil amendments and others offer stabilization of REE, eventually creating a legacy problem since REE keep accumulating in the soil. Soil remediation techniques that achieve REE extraction are a step closer to resource recovery, contributing to the circularity of REE. Techniques such as phytoremediation, soil washing and electrokinetic treatment show promising extraction results.

稀土元素（REE）对于太阳能和风能等可持续能源至关重要，由于循环社会的宏伟目标，需求不断增加。稀土元素目前是从原始矿石中开采出来的，而富含稀土元素的污染土壤则未经处理。需要土壤修复策略，以同时清理土壤和收获有助于循环经济的金属。在这篇综述中，我们旨在（i）定义污染土壤中的REE浓度，以及（ii）确定用于从土壤中修复REE的土壤修复技术，重点是提取REE的技术。当前的文献列出了在稀土矿，煤矿，交通繁忙的道路和农业土壤附近的稀土污染土壤（由于稀土元素与磷肥的结合）。我们首先列出采矿业中使用的常规分离方法及其提取/沉淀稀土的主要策略。溶剂萃取是最常用的常规方法，然后在高温下电沉积REE。然后，我们重点介绍用于处理稀土元素的土壤修复技术。这些技术可以分为两种类型：（a）稳定土壤中REE的技术，以及（b）从土壤中提取REE的技术。生物修复，土壤改良剂等可以稳定稀土元素，由于稀土元素在土壤中不断积累，最终造成了遗留问题。实现稀土元素提取的土壤修复技术距离资源回收更近一步，有助于稀土元素的循环利用。植物修复等技术