Competitive behaviors between tungsten and iron in TBP−HCl−H2O extraction system

IF 4.7 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Transactions of Nonferrous Metals Society of China Pub Date : 2025-03-01 DOI:10.1016/S1003-6326(24)66729-4

Li-qin DENG , Xu-heng LIU , Xing-yu CHEN , Jiang-tao LI , Li-hua HE , Feng-long SUN , Zhong-wei ZHAO

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Abstract

The distribution and competitive behaviors of phosphotungstic acid and ferric chloride in the TBP–HCl–H₂O system were investigated by controlling the extractant concentration and the solution environment. The results revealed that phosphotungstic acid exhibited a strong affinity for TBP with decreasing TBP concentration. Higher acidity significantly improved the W extraction efficiency with TBP, and the lower Cl⁻ concentration reduced the extraction efficiency of Fe. As the organic phase approached saturation point, phosphotungstic acid competitively displaced Fe to combine with TBP. The hydrogen bond structure (P=O·HO—P—W—O) between phosphotungstic acid and TBP was characterized by FT-IR, and the salting-out effect induced by FeCl₃ was elucidated. In summary, high acidity is beneficial for exhaustive extraction of W, and an effective W/Fe separation can be achieved by reducing the concentrations of TBP and Cl⁻.

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TBP - HCl - H2O萃取体系中钨与铁的竞争行为

通过控制萃取剂浓度和溶液环境，研究了磷钨酸和氯化铁在TBP-HCl-H2O体系中的分布和竞争行为。结果表明，随着TBP浓度的降低，磷钨酸对TBP具有较强的亲和力。较高的酸度显著提高了TBP对W的萃取效率，较低的Cl−浓度降低了对Fe的萃取效率。当有机相接近饱和点时，磷钨酸竞争性地取代Fe与TBP结合。利用红外光谱（FT-IR）表征了磷钨酸与TBP之间的氢键结构（P=O·HO-P-W-O），并阐明了FeCl3诱导的盐析效应。综上所述，高酸度有利于W的穷尽萃取，降低TBP和Cl−的浓度可以实现W/Fe的有效分离。

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

Transactions of Nonferrous Metals Society of China 工程技术-冶金工程

CiteScore

7.40

自引率

17.80%

发文量

8456

审稿时长

3.6 months

期刊介绍： The Transactions of Nonferrous Metals Society of China (Trans. Nonferrous Met. Soc. China), founded in 1991 and sponsored by The Nonferrous Metals Society of China, is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology, including mineral processing, extraction metallurgy, metallic materials and heat treatments, metal working, physical metallurgy, powder metallurgy, with the emphasis on fundamental science. It is the unique preeminent publication in English for scientists, engineers, under/post-graduates on the field of nonferrous metals industry. This journal is covered by many famous abstract/index systems and databases such as SCI Expanded, Ei Compendex Plus, INSPEC, CA, METADEX, AJ and JICST.