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Recycling of Tantalum-Coated Steel Bimetallic Composite Using High-Temperature Oxidation

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Abstract

A recycling route for tantalum-coated steel bimetallic composite using high-temperature oxidation is presented in this study. Four different types of tantalum-coated steel composites were studied for their oxidation behavior and compared. Each of the four composites differed from each other based on coating thickness and grade of steel substrate. The relationship between the type of tantalum-coated steel composite and oxidation trend is presented in order to successfully remove all of the coatings as tantalum pentoxide with minimal contamination from the steel substrate oxides. The oxidation behavior of the bimetallic composite was studied between 300 and 1200 °C by continuous and discontinuous oxidation methods. The oxidation behavior is found to be dependent on several factors including coating thickness, coating deposition method used, and the grade of steel substrate present. The oxidation trend of the coated composite is linear in nature, and the activation energy was found to be a variable between 70 and 90 kJ/mol for the different samples, which was found to be dependent on the chemical composition of the composite itself. The optimal temperature for coating removal is 700 °C, and the optimal time depends on the thickness of the coating. Moreover, magnetic separation was used to enhance the purity of the obtained tantalum pentoxide by removing magnetite content. Magnetic separation can increase purity by at least 75%.

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Acknowledgements

The authors would like to acknowledge the Center for Resource, Recovery and Recycling (CR3), and Materials Recovery Technology for Defense Supply Resiliency (MRT-DSR) program for funding and supplying samples for the project.

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Authors and Affiliations

  1. Department of Material Science and Engineering, Worcester Polytechnic Institute, 100 Institute Road, Worcester, MA, 01609, USA

    Akanksha Gupta & Brajendra Mishra

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  1. Akanksha Gupta
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  2. Brajendra Mishra
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Correspondence to Brajendra Mishra.

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The contributing editor for this article was Hongmin Zhu.

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Gupta, A., Mishra, B. Recycling of Tantalum-Coated Steel Bimetallic Composite Using High-Temperature Oxidation. J. Sustain. Metall. 10, 126–142 (2024). https://doi.org/10.1007/s40831-023-00780-4

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  • DOI: https://doi.org/10.1007/s40831-023-00780-4

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