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<p>High-purity tellurium is a critical raw material for applications in solar energy, semiconductors, and other industries. Zone refining is the main method for preparing high-purity tellurium. Precise control over the zone refining temperature and the melting zone length is essential for improving impurity removal efficiency. Simulations demonstrated that optimizing the melting zone length and refining temperature significantly enhanced the stability of the melting zone compared to the unoptimized process. Under the conditions of three zone refining passes, a zone movement speed of 0.5&#xa0;mm/min, and a hydrogen flow rate of 0.2 L/min, the impurity removal efficiency reached 95.9%, and the tellurium purity increased from 5N8 to 7N3. Achieving an optimal balance between efficiency and purity is crucial in the zone refining process to enhance production efficiency.</p>

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Efficient Preparation of 7N High-Purity Tellurium Based on Zone Refining with Melting Zone Modulation

  • 期刊论文

  • 发表日期：

    2025年10月14日

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  • Zhi-qiang He,
  • Qing-hua Tian,
  • Zhi-peng Xu,
  • Xue-yi Guo,
  • Dong Li

摘要

High-purity tellurium is a critical raw material for applications in solar energy, semiconductors, and other industries. Zone refining is the main method for preparing high-purity tellurium. Precise control over the zone refining temperature and the melting zone length is essential for improving impurity removal efficiency. Simulations demonstrated that optimizing the melting zone length and refining temperature significantly enhanced the stability of the melting zone compared to the unoptimized process. Under the conditions of three zone refining passes, a zone movement speed of 0.5 mm/min, and a hydrogen flow rate of 0.2 L/min, the impurity removal efficiency reached 95.9%, and the tellurium purity increased from 5N8 to 7N3. Achieving an optimal balance between efficiency and purity is crucial in the zone refining process to enhance production efficiency.