Extraction and purification of thorium and rare earth elements from bastnaesite mineral: a comprehensive leaching and precipitation study

IF 1.5 3区化学 Q3 CHEMISTRY, ANALYTICAL

Journal of Radioanalytical and Nuclear Chemistry Pub Date : 2024-08-31 DOI:10.1007/s10967-024-09724-y

Bekir Özkan, Yüksel Altaş, Süleyman İnan

引用次数: 0

Abstract

The present study focuses on investigating the conditions for acid leaching of Th and REEs and sequential oxalate precipitation to remove impurities from leach liquor. The effects of preheat treatment, leaching time, liquid/solid ratio, and acid concentration on Th, Sm, Pr, Nd, Ce, La, and U leaching yields were investigated. The best results were obtained at 400 °C preheated sample using 1 mol/L H₂SO₄, liquid/solid ratio of 1 mL/g, 60 min leaching time, and 30 °C leaching temperature. The leaching yields of Th, Sm, Pr, Nd, Ce, La, and U were found to be 41.7, 65.0, 68.2, 66.9, 84.3, 82.6, and 55.0% respectively. Th and REE liquors were treated with 0.5–1.5 mol/L H₂C₂O₄ solutions in the precipitation step. Purity was enhanced through three sequential precipitation cycles, resulting in a purity grade of 98.59%.

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从 bastnaesite 矿物中提取和提纯钍和稀土元素：浸出和沉淀综合研究

本研究的重点是调查 Th 和 REEs 酸浸出和顺序草酸盐沉淀去除浸出液中杂质的条件。研究了预热处理、浸出时间、液/固比率和酸浓度对 Th、Sm、Pr、Nd、Ce、La 和 U 浸出率的影响。在使用 1 mol/L H2SO4、液体/固体比率为 1 mL/g、浸出时间为 60 分钟、浸出温度为 30 °C、预热 400 °C 的样品时，获得了最佳结果。发现 Th、Sm、Pr、Nd、Ce、La 和 U 的浸出率分别为 41.7%、65.0%、68.2%、66.9%、84.3%、82.6% 和 55.0%。在沉淀步骤中，用 0.5-1.5 mol/L H2C2O4 溶液处理 Th 和 REE 液。通过三个连续的沉淀循环提高了纯度，最终纯度等级为 98.59%。

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

Journal of Radioanalytical and Nuclear Chemistry 化学-分析化学

CiteScore

2.80

自引率

18.80%

发文量

504

审稿时长

2.2 months

期刊介绍： An international periodical publishing original papers, letters, review papers and short communications on nuclear chemistry. The subjects covered include: Nuclear chemistry, Radiochemistry, Radiation chemistry, Radiobiological chemistry, Environmental radiochemistry, Production and control of radioisotopes and labelled compounds, Nuclear power plant chemistry, Nuclear fuel chemistry, Radioanalytical chemistry, Radiation detection and measurement, Nuclear instrumentation and automation, etc.