Closed-loop purification process for wet-process phosphoric acid raffinate: Separation of P2O5 and recovery of metal ions via solvent extraction

IF 3.9 3区工程技术 Q2 ENGINEERING, CHEMICAL

Chemical Engineering Research & Design Pub Date : 2025-08-06 DOI:10.1016/j.cherd.2025.08.005

Yanru Jin , Ting Jiang , Chao Hu , Yue Lan , Xiaokang Gong , Lin Yang

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Abstract

The recovery of critical metals from raffinate acid is crucial to address resource demands and enhance the value of raffinate acid. In this study, 90.41 %, 69.47 %, 48.86 % and 56.56 % of iron, aluminum, magnesium and calcium were coextracted from raffinate acid, with a P₂O₅ recovery efficiency of 95 %. Fe, Al, Mg, and Ca were stripped in a single step using ammonium oxalate. Under optimal condition, metal ions in the organic phase were completely extracted via two-stage countercurrent stripping. The stripping process yielded calcium oxalate, while ammonium oxalate stripping solution was used to synthesize hydrotalcite and Fe(OH)₃, enabling synergistic resource utilization. The coordination chemistry of iron, aluminum, and magnesium in ammonium oxalate stripping solutions was systematically investigated. Through integrated analysis employing Visual MINTEQ software，in-situ infrared spectrometer and Raman process analyzer, these metallic species were conclusively identified as existing exclusively in the forms of Fe(C₂O₄)₃^3-, Al(C₂O₄)₃^3-, Mg(C₂O₄)₂^2-.

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湿法磷酸萃余液闭环净化工艺：分离P2O5，溶剂萃取回收金属离子

从萃余酸中回收关键金属是解决资源需求和提高萃余酸价值的关键。从萃余酸中共提取铁、铝、镁和钙的回收率分别为90.41 %、69.47 %、48.86 %和56.56 %，P2O5回收率为95 %。用草酸铵一步分离铁、铝、镁和钙。在最佳条件下，有机相中的金属离子通过两段逆流汽提完全提取。汽提制得草酸钙，而草酸铵汽提液可合成水滑石和Fe(OH)3，实现资源协同利用。系统地研究了草酸铵汽提液中铁、铝、镁的配位化学。通过Visual MINTEQ软件、现场红外光谱仪和拉曼过程分析仪的综合分析，确定了这些金属只以Fe(C2O4)33-、Al(C2O4)33-、Mg(C2O4)22-的形式存在。

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来源期刊

Chemical Engineering Research & Design 工程技术-工程：化工

CiteScore

6.10

自引率

7.70%

发文量

623

审稿时长

42 days

期刊介绍： ChERD aims to be the principal international journal for publication of high quality, original papers in chemical engineering. Papers showing how research results can be used in chemical engineering design, and accounts of experimental or theoretical research work bringing new perspectives to established principles, highlighting unsolved problems or indicating directions for future research, are particularly welcome. Contributions that deal with new developments in plant or processes and that can be given quantitative expression are encouraged. The journal is especially interested in papers that extend the boundaries of traditional chemical engineering.