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Research status of oxygen-containing acid root detection methods and application prospect of mass spectrometry in tungsten-molybdenum separation

  • Shujie LIN Pengge NING Yi ZHANG
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  • 1. Beijing Engineering Research Center of Process Pollution Control, National Engineering Laboratory for Hydrometallurgical Cleaner Production & Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China 
    2. School of Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China

Received date: 2018-12-10

  Revised date: 2019-02-22

  Online published: 2019-10-22

Abstract

Tungsten and molybdenum are rare high melting point metals and play important roles in national economy and defense. Tungsten and molybdenum often co-exist in natural resources. Due to the effect of "Lanthanide Contraction", their atomic radius and chemical properties are very similar, so that it is difficult to separate them. Therefore, the separation of tungsten and molybdenum has always been the focus of researches. Solvent extraction method has the advantages of simple operation, high recovery rate and high purity, which is widely used in the separation of tungsten and molybdenum. When separating tungsten and molybdenum by extraction, tungsten and molybdenum speciation will affect the combination mode with extractant and extraction process. The study of tungsten and molybdenum speciation in the recovery process is helpful to deeply understand the separation mechanism of tungsten and molybdenum, so as to provide guidance for industrial production. In aqueous solution, tungsten and molybdenum speciation exists in the form of tungsten/molybdenum oxygen-containing acid radical. The essence of studying tungsten and molybdenum speciation is to investigate the influence of different forms of tungsten–molybdenum oxygen-containing acid radical on the extraction and separation process. In previous studies, people focused on the study of metal speciation in biological and environmental fields, however, little literature reported the role of ions speciation in the separation and recovery of tungsten and molybdenum. Although pH-potentiometric titration and thermodynamic calculation methods have been used to study the ions speciation in aqueous solution, they are always inaccurate and have limitations in predicting the distribution and transformation process of metal ions or complexes. Therefore, instrumental analysis methods are needed to determine species speciation and transformation process. In this work, instrumental analysis methods of oxygen-containing acid radical ions speciation in aqueous solution were summarized. ESI-MS had potential applications in monitoring tungsten/molybdenum transformation pathways in the extraction process. In addition, monitoring methods of tungsten and molybdenum speciation and their transformation pathways in hydrometallurgical fields were prospected. Finally, theoretical guidance for further understanding of tungsten–molybdenum separation mechanism and directional regulation as well as industrial production was provided.

Cite this article

Shujie LIN Pengge NING Yi ZHANG . Research status of oxygen-containing acid root detection methods and application prospect of mass spectrometry in tungsten-molybdenum separation[J]. The Chinese Journal of Process Engineering, 2019 , 19(5) : 910 -918 . DOI: 10.12034/j.issn.1009-606X.218333

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