稀土配位化合物的吸附

IF 2.4 Q2 MINING & MINERAL PROCESSING
O. Cheremisina, E. Cheremisina, M. Ponomareva, А. Fedorov
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引用次数: 10

摘要

稀土元素在激光技术、制药和冶金等高科技领域具有重要的价值和战略意义。稀土回收的主要方法是沉淀、萃取和吸附,特别是利用各种吸附剂进行离子交换,可以选择性地回收和去除伴生成分,并分离出具有相似化学性质的稀土金属。本文研究了在弱碱性阴离子交换树脂D-403上以万亿B配位化合物的形式从硝酸盐溶液中回收镱。为了估计镱阴离子配合物的热力学吸附参数,采用变浓度法在NaNO3指定的恒定离子强度、最佳液固比、pH、温度298和343 K条件下对模型溶液进行了离子交换过程。用质量作用定律描述离子交换方程的热力学平衡,并用数学方法将其转化为线性形式。计算了吸附过程的平衡常数、吉布斯自由能、焓和熵。根据计算出的吉布斯能,在温度为298 K的硝酸溶液中,用阴离子交换树脂D-403吸附了一系列与万亿B络合的REE离子。估计了阴离子交换树脂的吸附特性:总容量、络合物离子的极限吸附量、总动态容量和突破动态容量。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Sorption of rare earth coordination compounds
Rare earth elements (REEs) are valuable and strategically important in many high-technology areas, such as laser technology, pharmacy and metallurgy. The main methods of REE recovery are precipitation, extraction and sorption, in particular ion exchange using various sorbents, which allow to perform selective recovery and removal of associated components, as well as to separate rare earth metals with similar chemical properties. The paper examines recovery of ytterbium in the form of coordination compounds with Trilon B on weakly basic anion exchange resin D-403 from nitrate solutions. In order to estimate thermodynamic sorption parameters of ytterbium anionic complexes, ion exchange process was carried out from model solutions under constant ionic strength specified by NaNO3, optimal liquid to solid ratio, pH level, temperatures 298 and 343 K by variable concentrations method. Description of thermodynamic equilibrium was made using mass action law formulated for ion exchange equation and mathematically converted to linear form. Values of equilibrium constants, Gibbs free energy, enthalpy and entropy of the sorption process have been calculated. Basing on calculated values of Gibbs energy, a sorption series of complex REE ions with Trilon B was obtained over anion exchange resin D-403 from nitrate solutions at temperature 298 K. Sorption characteristics of anion exchange resin have been estimated: total capacity, limiting sorption of complex ions, total dynamic capacity and breakthrough dynamic capacity.
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来源期刊
Journal of Mining Institute
Journal of Mining Institute MINING & MINERAL PROCESSING-
CiteScore
7.50
自引率
25.00%
发文量
62
审稿时长
8 weeks
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