草酸盐络合辅助N235萃取废合金硫酸浸出液中的铬和铝

IF 8.1 1区工程技术 Q1 ENGINEERING, CHEMICAL

Separation and Purification Technology Pub Date : 2025-05-29 DOI:10.1016/j.seppur.2025.133805

Ning Yin , Yonghui Song , Xingyu Zhang , Xinwei Zhang , Ping Dong

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引用次数: 0

摘要

本研究采用草酸和三辛基叔胺（N235）络合辅助萃取体系从合金废料硫酸浸出液中分离出Cr（Ⅲ）和Al（Ⅲ）。系统考察了预处理条件和提取参数对提取效率的影响。通过FTIR、UV-Vis和ESI-MS技术对负载有机相进行分析表征，阐明了Cr（Ⅲ）和Al（Ⅲ）的形态和萃取机理。结果表明：在最佳预处理条件下（C2O42−添加量0.9 M, 85℃，60 min），浸出液中的Cr（Ⅲ）和Al（Ⅲ）由CrSO4+和Al(SO4)2−转化为Cr(C2O4)2−、Al(C2O4)2−和Al(C2O4)33 -；萃取机制遵循阴离子缔合原理，质子化的N235与这些草酸盐形成电中性配合物，使它们通过形成[R3NH·Cr(C2O4)2]、[R3NH·Al(C2O4)2]和[(R3NH)3·Al(C2O4)3]转移到有机相。Cr（Ⅲ）的萃取为吸热反应，Al（Ⅲ）的萃取为放热反应，温度升高有利于Cr（Ⅲ）的萃取。在优化的萃取条件下(40% N235, 10%癸醇，50%磺化煤油；O /比例2:1,55°C, 20分钟),两级逆流萃取效率实现99.89%的铬和99.93%。艾尔的选择性剥离(Ⅲ)和Cr(Ⅲ)装载有机相进行使用1.7 M硫酸和2.0 M氢氧化钠解决方案在一个O / 2:1的比例和接触时间10分钟,用汽提效率达到99.79%,艾尔(Ⅲ)为99.95%,Cr(Ⅲ),分别,从而使Cr和艾尔的完全分离和恢复。

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Oxalate complexation-assisted N235 extraction of Cr and Al from sulfuric acid leaching solution of alloy scrap

In this study, a complexation-assisted extraction system using oxalate and Trioctyl tertiary amine (N235) was employed to separate Cr(Ⅲ) and Al(Ⅲ) from the sulfuric acid leaching solution of alloy scrap. The effects of pretreatment conditions and extraction parameters on the extraction efficiency were systematically investigated. The speciation of Cr(Ⅲ) and Al(Ⅲ) and extraction mechanisms were elucidated through analytical characterization of the loaded organic phase using FTIR, UV–Vis, and ESI-MS techniques. The results indicated that under optimal pretreatment conditions (0.9 M C₂O₄²⁻ addition, 85 °C, 60 min), Cr(Ⅲ) and Al(Ⅲ) in the leaching solution were transformed from CrSO₄⁺ and Al(SO₄)₂⁻ to Cr(C₂O₄)₂⁻, Al(C₂O₄)₂⁻, and Al(C₂O₄)₃^3–. The extraction mechanism followed an anion association principle, where protonated N235 formed electrically neutral complexes with these oxalate species, enabling their transfer to the organic phase via the formation of [R₃NH·Cr(C₂O₄)₂], [R₃NH·Al(C₂O₄)₂] and [(R₃NH)₃·Al(C₂O₄)₃]. The extraction of Cr(Ⅲ) was an endothermic reaction, while that of Al(Ⅲ) was exothermic, with elevated temperatures favoring the extraction of Cr(Ⅲ). Under optimized extraction conditions (40 % N235, 10 % 1-decanol, 50 % sulfonated kerosene; O/A ratio 2:1, 55 °C, 20 min), two-stage countercurrent extraction achieved efficiencies of 99.89 % for Cr and 99.93 % for Al. Selective stripping of Al(Ⅲ) and Cr(Ⅲ) from the loaded organic phase was performed using 1.7 M H₂SO₄ and 2.0 M NaOH solutions at an O/A ratio of 2:1 and contact time of 10 min, with stripping efficiencies reaching 99.79 % for Al(Ⅲ) and 99.95 % for Cr(Ⅲ), respectively, thereby enabling the complete separation and recovery of Cr and Al.

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来源期刊

Separation and Purification Technology 工程技术-工程：化工

CiteScore

14.00

自引率

12.80%

发文量

2347

审稿时长

43 days

期刊介绍： Separation and Purification Technology is a premier journal committed to sharing innovative methods for separation and purification in chemical and environmental engineering, encompassing both homogeneous solutions and heterogeneous mixtures. Our scope includes the separation and/or purification of liquids, vapors, and gases, as well as carbon capture and separation techniques. However, it's important to note that methods solely intended for analytical purposes are not within the scope of the journal. Additionally, disciplines such as soil science, polymer science, and metallurgy fall outside the purview of Separation and Purification Technology. Join us in advancing the field of separation and purification methods for sustainable solutions in chemical and environmental engineering.