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Recovery of rare earth elements from phosphogypsum waste in resin-in-leach process by eluting with biodegradable complexing agents
Hydrometallurgy ( IF 4.7 ) Pub Date : 2021-02-02 , DOI: 10.1016/j.hydromet.2021.105569
Santeri Kurkinen , Sami Virolainen , Tuomo Sainio

Phosphogypsum waste is a potential, secondary rare earth element (REE) source that is available in very large volumes. Extraction and purification of REE from this complex waste was studied using resin-in-leach (RIL) followed by batch elution. Multiple consecutive RIL cycles with Purolite S940 resin in dilute H2SO4 solution were performed for an industrial phosphogypsum waste. REE loading (max. 0.92 equiv./kg) and purity over calcium (70%) increased up to seven cycles. REE and the impurities were separated by treating the loaded resin in a packed bed column with a two-step elution procedure. Calcium was efficiently removed with 0.06 M HCl. Alkaline solutions of biodegradable chelating agents N,N–dicarboxymethyl glutamic acid (GLDA), methylglycinediacetic acid (MGDA), oxalic acid, citric acid and iminodiacetate were studied for the second elution step. MGDA and GLDA were both suitable candidates for effective REE elution from S940 resin. A calcium free, high purity REE fraction (up to 99.01%) was obtained with MGDA. The most likely REE:MGDA complex stoichiometry was found to be 1:1 by using the method of continuous variation.



中文翻译:

通过可生物降解的络合剂洗脱,从树脂浸出法中的磷石膏废料中回收稀土元素

磷石膏废料是潜在的次要稀土元素(REE)来源,可大量获取。使用浸出树脂(RIL),然后分批洗脱,研究了从这种复杂废物中提取和纯化REE的方法。用Purolite S940树脂在稀H 2 SO 4中进行多个连续的RIL循环溶液用于工业磷石膏废料。稀土负载(最大0.92当量/千克)和超过钙的纯度(70%)提高了七个循环。通过用两步洗脱程序在填充床柱中处理负载的树脂来分离REE和杂质。用0.06 M HCl有效除去钙。研究了可生物降解的螯合剂N,N-二羧甲基谷氨酸(GLDA),甲基甘氨酸二乙酸(MGDA),草酸,柠檬酸和亚氨基二乙酸盐的碱溶液用于第二步洗脱。MGDA和GLDA都是从S940树脂有效洗脱REE的合适候选物。用MGDA获得无钙,高纯度的REE馏分(最高99.01%)。通过使用连续变化的方法,发现最有可能的REE:MGDA复合物化学计量比为1:1。

更新日期:2021-02-11
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