Abstract Improper disposal of effluent generated in rare earth mining areas and ore processing industries results in loss of REMs and miserably affects the ecosystem. Thus, their appropriate treatment is required, which can be achieved via environmentally feasible processes. In this connection, systematic scientific adsorption studies were carried out to separate REMs using cationic resin, Amberlite IR120 Na from the effluent generated during monazite processing for REMs recovery. To optimize feasible conditions for REMs recovery, bench scale studies were carried out varying different process parameters viz. pH, contact time, resin dose, etc. It was observed that adsorption of 92.63% La, 92.79% Ce, 91.45% Nd, 90.95% Pr and 95.09% Sm was achieved at aqueous/ resin (A/R) ratio 25 mL/g, pH 1.3 and contact time 10 min. Loading capacity of resin was found to hold 48.57 mg REMs/g resin. The adsorption data followed the second order reaction ((t/q) = (1/h) + (1/qe)(t)) and Langmuir adsorption isotherm (1/q = [(1/k1 qm)(1/Ce)] + (1/qm)). The loaded REMs was effectively eluted using 15% H2SO4 in 10 min. The REMs enriched solution was treated to get pure REM oxides as precipitate. This technical application will be useful for REMs recovery as well as to mitigate environmental pollution.

中文翻译：

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处理独居石处理的废水以回收稀土金属 (REM)

摘要 稀土矿区和矿石加工业产生的废水处理不当，导致稀土元素流失，严重影响生态系统。因此，需要对它们进行适当的处​​理，这可以通过环境可行的工艺来实现。在这方面，进行了系统的科学吸附研究，以使用阳离子树脂 Amberlite IR120 Na 从独居石加工过程中产生的废水中分离 REM，以回收 REM。为了优化 REM 回收的可行条件，进行了实验室规模研究，改变了不同的工艺参数，即。pH、接触时间、树脂剂量等。据观察，在水/树脂 (A/R) 比为 25 mL/时，吸附了 92.63% La、92.79% Ce、91.45% Nd、90.95% Pr 和 95.09% Sm g，pH 1.3，接触时间 10 分钟。发现树脂的负载能力为 48.57 mg REMs/g 树脂。吸附数据遵循二级反应 ((t/q) = (1/h) + (1/qe)(t)) 和 Langmuir 吸附等温线 (1/q = [(1/k1 qm)(1/Ce )] + (1/qm))。使用 15% H2SO4 在 10 分钟内有效洗脱负载的 REM。对富含 REM 的溶液进行处理以获得作为沉淀物的纯 REM 氧化物。该技术应用将有助于 REM 回收以及减轻环境污染。