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<p>Improving tellurium purity while enhancing production efficiency is a critical challenge in advanced materials manufacturing. In this study, a new sustainable rotation-enhanced crystallization technique for preparing of high-purity tellurium is proposed for the first time. By controlling the interfacial shear force and thermal temperature gradient generated by rotation, the efficiency of high-purity tellurium preparation is significantly improved. Theoretical calculations based on binary phase diagrams and the Burton-Prim-Slichter model revealed the temperature-dependent equilibrium distribution coefficients of key impurities (Cu, Pb, Ag, Sn), providing a strong foundation for process optimization. Under optimal conditions [425°C crystallization temperature, 60&#xa0;min crystallization time, 60&#xa0;r/min(RPM) rotation rate], the removal rates for Cu, Pb, Ag, and Sn were 96%, 87.4%, 99%, and 99%, respectively, achieving an overall impurity removal rate of 75%. Notably, this method achieves 5N5 purity in a single step, eliminating the need for multi-stage distillation or prolonged zone melting—a breakthrough unattainable with existing technologies. Comparative analysis reveals a 95% faster processing time than zone melting and 30% lower energy consumption than vacuum distillation, alongside broad feedstock adaptability. Beyond advancing mechanistic understanding of impurity migration during crystallization, this work establishes rotational crystallization as a scalable, next-generation technology for sustainable high-purity tellurium production, directly aligning with global clean manufacturing goals.</p>

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Enhanced Purification Efficiency of High-Purity Tellurium via Sustainable Rotary Crystallization: A Focus on Impurity Migration Behavior

  • 期刊论文

  • 发表日期：

    2025年5月30日

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  • Qijin Luo,
  • Jinbo Zhai,
  • Guolong Chen,
  • Daxin Huang,
  • Zhichao Li,
  • Baoqiang Xu,
  • Bin Yang,
  • Guozheng Zha,
  • Wenlong Jiang

摘要

Improving tellurium purity while enhancing production efficiency is a critical challenge in advanced materials manufacturing. In this study, a new sustainable rotation-enhanced crystallization technique for preparing of high-purity tellurium is proposed for the first time. By controlling the interfacial shear force and thermal temperature gradient generated by rotation, the efficiency of high-purity tellurium preparation is significantly improved. Theoretical calculations based on binary phase diagrams and the Burton-Prim-Slichter model revealed the temperature-dependent equilibrium distribution coefficients of key impurities (Cu, Pb, Ag, Sn), providing a strong foundation for process optimization. Under optimal conditions [425°C crystallization temperature, 60 min crystallization time, 60 r/min(RPM) rotation rate], the removal rates for Cu, Pb, Ag, and Sn were 96%, 87.4%, 99%, and 99%, respectively, achieving an overall impurity removal rate of 75%. Notably, this method achieves 5N5 purity in a single step, eliminating the need for multi-stage distillation or prolonged zone melting—a breakthrough unattainable with existing technologies. Comparative analysis reveals a 95% faster processing time than zone melting and 30% lower energy consumption than vacuum distillation, alongside broad feedstock adaptability. Beyond advancing mechanistic understanding of impurity migration during crystallization, this work establishes rotational crystallization as a scalable, next-generation technology for sustainable high-purity tellurium production, directly aligning with global clean manufacturing goals.