使用纯乙酰丙酸和低共熔溶剂乙酰丙酸-氯化胆碱从废荧光灯中回收钇和铕,RSC Advances

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使用纯乙酰丙酸和低共熔溶剂乙酰丙酸-氯化胆碱从废荧光灯中回收钇和铕
RSC Advances ( IF 3.9 ) Pub Date : 2020-8-4 , DOI: 10.1039/d0ra05508e
Ioanna M Pateli ₁ , Andrew P Abbott ₁ , Koen Binnemans ₂ , Nerea Rodriguez Rodriguez ₂

Affiliation

开发了一种从灯荧光粉废料中回收稀土元素的溶剂冶金方法。测量了单个荧光粉在不同深共晶溶剂 (DES) 中的溶解度。DES乙酰丙酸-氯化胆碱( x _ChCl = 0.33)显示出YOX荧光粉(Y ₂ O ₃ :Eu ³⁺ )的高溶解度和HALO荧光粉(Sr,Ca) ₁₀ (PO ₄ )(Cl, F) ₂ :Sb ³⁺ ,Mn ²⁺，其中不含任何稀土元素。选择此 DES 进行进一步调查。当 DES 与纯乙酰丙酸进行比较时，观察到非常相似的浸出行为，表明质子活性比作为金属配体的氯化物更重要。使用乙酰丙酸-氯化胆碱 ( x _{ChCl ) 浸出 YOX 和 HALO}= 0.33) 或纯乙酰丙酸在含水量、温度和浸出时间方面进行了优化。优化的参数在荧光粉的合成混合物和真实的灯荧光粉废料中得到验证。HALO 在实际废物中的共溶解度高于在合成混合物中的溶解度。真正的废物也用对 YOX 的溶解没有选择性的盐酸水溶液和功能化的离子液体甜菜鎓双(三氟甲基磺酰)亚胺浸出。离子液体的选择性与乙酰丙酸相似，但价格昂贵得多。通过以下方法测试了从富浸出溶液中回收金属的情况用草酸沉淀和溶剂萃取。草酸沉淀不适用于 DES 系统。金属可以通过用酸性萃取剂双（2-乙基己基）磷酸（D2EHPA）进行溶剂萃取来萃取，然后用盐酸水溶液进行汽提。发现纯乙酰丙酸比相应的基于 ChCl 的 DES 更适合选择性回收 YOX。

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Recovery of yttrium and europium from spent fluorescent lamps using pure levulinic acid and the deep eutectic solvent levulinic acid–choline chloride

A solvometallurgical approach for the recovery of rare-earth elements from lamp phosphor waste was developed. The solubility of individual phosphors in different deep-eutectic solvents (DESs) was measured. The DES levulinic acid–choline chloride (x_ChCl = 0.33) showed high solubility of the YOX phosphor (Y₂O₃:Eu³⁺) and low solubility of the HALO phosphor (Sr,Ca)₁₀(PO₄)(Cl,F)₂:Sb³⁺,Mn²⁺, which does not contain any rare-earth element. This DES was selected for further investigation. When the DES was compared to pure levulinic acid, very similar leaching behaviour was observed, showing that the proton activity is more important than the chloride as a metal ligand. The leaching of YOX and HALO using levulinic acid–choline chloride (x_ChCl = 0.33) or pure levulinic acid was optimised in terms of water content, temperature and leaching time. The optimised parameters were validated in a synthetic mixture of phosphors and in real lamp phosphor waste. The co-dissolution of HALO is higher in the real waste than in the synthetic mixture. The real waste was also leached with an aqueous solution of hydrochloric acid, which was non-selective against dissolution of YOX, and with the functionalised ionic liquid betainium bis(trifluoromethylsulfonyl)imide. The ionic liquid gave a similar selectivity as levulinic acid, but is much more expensive. The recovery of the metals from the pregnant leach solution was tested via precipitation with oxalic acid and solvent extraction. Oxalic acid precipitation was not suitable for the DES system. The metals could be extracted via solvent extraction with the acidic extractant bis(2-ethylhexyl)phosphoric acid (D2EHPA) and stripped by an aqueous hydrochloric acid solution. Pure levulinic acid was found to be more suitable than the corresponding ChCl-based DES for the selective recovery of YOX.

更新日期：2020-08-04

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