Process evaluation for the recovery of rare earth from bastnaesite using ferric sulfate bio acid

IF 10.9 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL Resources Conservation and Recycling Pub Date : 2025-04-01 Epub Date: 2025-01-10 DOI:10.1016/j.resconrec.2024.108115

Wei Liu , Jing Liu , Emmanuel Yaw Owusu-Fordjour , Xinbo Yang

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Abstract

The ferric sulfate bio acid (BA) produced from the bio-oxidation of pyrite in coal waste has been found to be a potential lixiviant to recover metals such as rare earth elements (REEs). Herein, a novel process consisting of oxidation roasting-BA leaching-reductive solvent extraction (SX) was proposed to recover REEs from a bastnaesite concentrate. Parametric leaching tests were conducted to evaluate the leaching performance of the BA. Subsequently, SX after ascorbic acid (ASA) reduction and selective precipitation were tested separately to purify the BA leachate. Results show that, similar to 0.2 M H₂SO₄, the BA can effectively recover 90 % of the major REEs from the roasted bastnaesite under optimal conditions. Compared to selective precipitation, SX after ASA reduction was more effective in separating REEs from Fe and other contaminants. The proposed process offers a new path to recover REEs and manage coal waste in a sustainable way.

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硫酸铁生物酸法从氟碳铈矿中回收稀土的工艺评价

利用煤矸石中黄铁矿进行生物氧化制备的硫酸铁生物酸（BA）是一种很有潜力的回收稀土等金属的浸出剂。采用氧化焙烧—ba浸出—还原性溶剂萃取（SX）工艺从某氟碳铈矿精矿中回收稀土元素。进行了参数浸出试验，评价了BA的浸出性能。随后，分别采用抗坏血酸还原SX和选择性沉淀对BA渗滤液进行净化试验。结果表明，在最优条件下，BA与0.2 M H2SO4相似，可以有效地从焙烧的氟碳铈矿中回收90%的主要稀土元素。与选择性沉淀相比，ASA还原后的SX在分离Fe和其他污染物方面更有效。该工艺为稀土元素的回收和煤炭废弃物的可持续管理提供了一条新途径。

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来源期刊

Resources Conservation and Recycling 环境科学-工程：环境

CiteScore

22.90

自引率

6.10%

发文量

625

审稿时长

23 days

期刊介绍： The journal Resources, Conservation & Recycling welcomes contributions from research, which consider sustainable management and conservation of resources. The journal prioritizes understanding the transformation processes crucial for transitioning toward more sustainable production and consumption systems. It highlights technological, economic, institutional, and policy aspects related to specific resource management practices such as conservation, recycling, and resource substitution, as well as broader strategies like improving resource productivity and restructuring production and consumption patterns. Contributions may address regional, national, or international scales and can range from individual resources or technologies to entire sectors or systems. Authors are encouraged to explore scientific and methodological issues alongside practical, environmental, and economic implications. However, manuscripts focusing solely on laboratory experiments without discussing their broader implications will not be considered for publication in the journal.