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<p>The study aims to recycle metal values like yttrium and zirconium from spent dental zirconia powder using various technologies. The spent powder is mainly composed of 92.2% zirconium, 5.8% yttrium, and less than 0.7% other mixed rare earth oxides. Leaching screening was conducted using minerals and organic acids, with tartaric acid and nitric acid showing the highest efficiency. The recommended leaching parameters were 0.5&#xa0;M tartaric acid, a liquid-to-solid ratio of 2.5:1, and a shaking duration of 2&#xa0;h at 65&#xa0;°C. The leached solution was analyzed using ICP-OES and found to be 75% Y(III). 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester (PC88A) extractant in kerosene was used for extraction and separation of Zr and Y from the zirconia binary leachate solution. Results showed that extraction for Zr(IV) and Y(III) reached 98 and 95%, respectively. The separation conditions was achieved by stripping of Y(III) from organic phases using sulfamic acid, and Zr(IV) was completely stripped using 1&#xa0;M HCl. A flow sheet summarizing the leaching and separation of zirconium and yttrium from dental zirconia powder waste from the denture industry was constructed.</p>

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Sustainable recycling and separation of yttrium and zirconium metal values through leaching and extraction insights

  • 期刊论文

  • 发表日期：

    2026年3月11日

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  • B. A. Masry,
  • E. M. Abu Elgoud,
  • H. M. Gayed,
  • E. H. Borai,
  • Y. A. El-Nadi

摘要

The study aims to recycle metal values like yttrium and zirconium from spent dental zirconia powder using various technologies. The spent powder is mainly composed of 92.2% zirconium, 5.8% yttrium, and less than 0.7% other mixed rare earth oxides. Leaching screening was conducted using minerals and organic acids, with tartaric acid and nitric acid showing the highest efficiency. The recommended leaching parameters were 0.5 M tartaric acid, a liquid-to-solid ratio of 2.5:1, and a shaking duration of 2 h at 65 °C. The leached solution was analyzed using ICP-OES and found to be 75% Y(III). 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester (PC88A) extractant in kerosene was used for extraction and separation of Zr and Y from the zirconia binary leachate solution. Results showed that extraction for Zr(IV) and Y(III) reached 98 and 95%, respectively. The separation conditions was achieved by stripping of Y(III) from organic phases using sulfamic acid, and Zr(IV) was completely stripped using 1 M HCl. A flow sheet summarizing the leaching and separation of zirconium and yttrium from dental zirconia powder waste from the denture industry was constructed.