用镧铈氧化物调节pH同步去除稀土浸出液中的非稀土离子(Al3+、Fe3+、Th4+、U6+和F−

IF 4.8 2区 材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING
Di Wu , Xinjin Xiao , An Guo , Qiaofa Lan , Huijuan Wang , Liusheng Ge , Xiaoqiang Wen , Lingdong Sun , Chunsheng Liao
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引用次数: 0

摘要

由于浸出液中非稀土杂质污染的增加,消除非稀土阴离子和阳离子对中国稀土生产商来说是一个挑战。基于常规碱性试剂的去污机理,研究了稀土浸出液中非稀土阴离子和阳离子的同步去除工艺。在这项工作中,在30°C的水浴温度下,加入20 g/100 mL铝基载体,通过添加镧铈氧化物将pH调节到4.0,来净化溶液(初始pH为1.12)中的主要非稀土阴离子和阳离子。将镧铈氧化物按镧铈摩尔比为4:1混合,并在1000℃下烘烤。对Al3+、Fe3+、Th4+、U6+和F−的去除率分别为97.5%、92.7%、91.7%、97.4%和95.7%。净化后的固体经洗涤、干燥、焙烧后可转化为新的铝基载体重复使用。经过3次循环后,非稀土阴离子和阳离子的去除率变化小于3%。非稀土杂质的去除率显著提高,稀土的损失率从5%下降到约2%。该工艺为高富集镧和铈开辟了新的应用前景,并避免了从传统碱源引入新杂质的风险。这一过程对稀土生产企业的绿色健康发展具有现实意义。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Synchronized removal of non-rare earth ions (Al3+, Fe3+, Th4+, U6+, and F−) from rare earth leach solutions using lanthanum‑cerium oxides for pH adjustment
Eliminating non-rare earth anions and cations is a challenge for Chinese rare earth producers due to the increase in the contamination with non-rare earth impurities in leach solutions. Based on the decontamination mechanism of conventional alkaline reagents, a procedure for the synchronized removal of non-rare earth anions and cations from rare earth leach solutions was developed. In this work, the principal non-rare earth anions and cations in the solution (initial pH of 1.12) was decontaminated by adding lanthanum–cerium oxides to adjust the pH to 4.0 with the addition of a 20 g/100 mL aluminum-based carrier at a water bath temperature of 30 °C. The lanthanum‑cerium oxides were mixed at a lanthanum‑cerium molar ratio of 4:1 and roasted at 1000 °C. The removal efficiencies of Al3+, Fe3+, Th4+, U6+, and F were 97.5 %, 92.7 %, 91.7 %, 97.4 %, and 95.7 %, respectively. The solid produced after decontamination could be transformed into a new aluminum-based carrier for repeated use after washing, drying, and roasting. The variation in non-rare earth anion and cation removal efficiencies was less than 3 % after three cycles. The removal of non-rare earth impurities was significantly improved, with a decrease in the loss of rare earths from 5 % to approximately 2 %. This process opens new application scenarios for highly abundant lanthanum and cerium and avoids the risk of introducing new impurities from conventional alkali sources. This process has practical significance for the green and healthy development of rare earth producing enterprises.
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来源期刊
Hydrometallurgy
Hydrometallurgy 工程技术-冶金工程
CiteScore
9.50
自引率
6.40%
发文量
144
审稿时长
3.4 months
期刊介绍: Hydrometallurgy aims to compile studies on novel processes, process design, chemistry, modelling, control, economics and interfaces between unit operations, and to provide a forum for discussions on case histories and operational difficulties. Topics covered include: leaching of metal values by chemical reagents or bacterial action at ambient or elevated pressures and temperatures; separation of solids from leach liquors; removal of impurities and recovery of metal values by precipitation, ion exchange, solvent extraction, gaseous reduction, cementation, electro-winning and electro-refining; pre-treatment of ores by roasting or chemical treatments such as halogenation or reduction; recycling of reagents and treatment of effluents.
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