Electrochemical reduction method for leaching terbium and cerium from waste phosphors†

IF 3.9 3区 化学 Q2 CHEMISTRY, MULTIDISCIPLINARY
RSC Advances Pub Date : 2024-12-12 DOI:10.1039/D4RA06334A
Ruixiang Wang, Piao Xu, Boyi Xie, Chaxiang Liu, Xiaocong Zhong, Zhongtang Zhang and Helin Fan
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Abstract

Rare earth elements are commonly used in various fields due to their unique physical and chemical properties. Waste phosphors represent an important secondary source of rare earth elements, and their recovery is a crucial means of improving the utilization of these resources. When using FeCl2 as a reducing agent to reduce Tb4+ and Ce4+ from washed phosphors, a large amount of reducing agent is required, and the Fe2+ cycle becomes complicated. In this study, the electrochemical reduction process was employed to treat washed phosphors. Under optimum conditions of FeCl2 concentration of 0.10 mol L−1, current density of 100 A m−2, HCl concentration of 3 mol L−1, temperature of 80 °C, L/S ratio of 30 mL g−1, and time of 60 min, the leaching efficiencies of Tb and Ce reached 99.2% and 98.5%, respectively. The apparent activation energies of Tb and Ce were calculated as 17.71 and 18.46 kJ mol−1, respectively, illustrating that the leaching processes of Tb and Ce depend on the diffusion. By applying an external electric field, Fe2+ can be recycled in the system, thereby reducing the amount of reducing agent needed and achieving a higher leaching efficiency for Tb and Ce. These results are beneficial for the resource utilization of waste phosphors and have significant implications for the sustainable development of rare earth resources.

Abstract Image

从废荧光粉中浸出铽和铈的电化学还原法†
稀土元素由于其独特的物理和化学性质,被广泛应用于各个领域。废荧光粉是稀土元素的重要二次来源,其回收是提高稀土资源利用率的重要手段。当使用FeCl2作为还原剂还原水洗荧光粉中的Tb4+和Ce4+时,需要大量的还原剂,并且Fe2+的循环变得复杂。本研究采用电化学还原法对洗涤后的荧光粉进行处理。在FeCl2浓度为0.10 mol L−1、电流密度为100 A m−2、HCl浓度为3 mol L−1、温度为80℃、L/S比为30 mL g−1、时间为60 min的最佳条件下,Tb和Ce的浸出效率分别达到99.2%和98.5%。计算得到Tb和Ce的表观活化能分别为17.71和18.46 kJ mol−1,说明Tb和Ce的浸出过程依赖于扩散。通过外加电场作用,Fe2+可以在系统中循环利用,从而减少还原剂用量,提高Tb和Ce的浸出效率。这些结果有利于废荧光粉的资源化利用,对稀土资源的可持续发展具有重要意义。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
RSC Advances
RSC Advances chemical sciences-
CiteScore
7.50
自引率
2.60%
发文量
3116
审稿时长
1.6 months
期刊介绍: An international, peer-reviewed journal covering all of the chemical sciences, including multidisciplinary and emerging areas. RSC Advances is a gold open access journal allowing researchers free access to research articles, and offering an affordable open access publishing option for authors around the world.
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