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<p>Gold and silver tellurides have recently garnered attention as potential alternative sources for Au, Ag, and Te extraction. Nevertheless, due to its refractoriness nature, it presents complications in the cyanidation process. Therefore, alternative treatments can serve as effective supplementary methods for treating gold-silver tellurides. This study aims to investigate at laboratory scale, the dissolution behavior of the silver telluride (Ag<sub>2</sub>Te) in acid media and using ozone as an oxidizing agent. The results obtained show that about 75% silver dissolution was achieved when 0.01&#xa0;g Ag<sub>2</sub>Te (-25&#xa0;µm) was subjected to 200&#xa0;mL of a 0.225&#xa0;M of HNO<sub>3</sub> leaching solution and 0.02&#xa0;g O<sub>3</sub>/L was bubbled with a leaching time of 60&#xa0;min. Stoichiometry tests, supported by SEM–EDS characterization, indicate that silver telluride leaching proceeds in a stoichiometry manner, and the absence of passive layers suggests that reaction kinetics are controlled by chemical reaction reactions. Furthermore, the apparent energy activation was estimated to be 6.55&#xa0;kJ/mol. While cyanidation test revealed a high degree of refractoriness, with silver recoveries of 30% after 48&#xa0;h, ozone leaching represents an efficient and sustainable alternative for the treatment of silver telluride. This is attributed to the low reaction times, the formation of oxygen as the primary reaction product, and the absence of additional pollutants ions in the system. In this way, ozonation emerges as a promising hydrometallurgical approach for the processing of gold-silver telluride ores.</p>

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Silver Telluride Dissolution by Sustainable Leaching Oxidation with Ozone: Kinetics and Stoichiometry Assessment

  • 期刊论文

  • 发表日期：

    2025年12月13日

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  • C. Rodríguez-Rodríguez,
  • J. C. Baltazar-Vera,
  • R. Solís-Rodríguez,
  • J. E. Valtierra-Olivares,
  • M. Salazar-Hernández,
  • M. R. Abraham-Juárez,
  • S. Bello-Teodoro,
  • O. Alonso-González,
  • J. A. González-Anaya

摘要

Gold and silver tellurides have recently garnered attention as potential alternative sources for Au, Ag, and Te extraction. Nevertheless, due to its refractoriness nature, it presents complications in the cyanidation process. Therefore, alternative treatments can serve as effective supplementary methods for treating gold-silver tellurides. This study aims to investigate at laboratory scale, the dissolution behavior of the silver telluride (Ag2Te) in acid media and using ozone as an oxidizing agent. The results obtained show that about 75% silver dissolution was achieved when 0.01 g Ag2Te (-25 µm) was subjected to 200 mL of a 0.225 M of HNO3 leaching solution and 0.02 g O3/L was bubbled with a leaching time of 60 min. Stoichiometry tests, supported by SEM–EDS characterization, indicate that silver telluride leaching proceeds in a stoichiometry manner, and the absence of passive layers suggests that reaction kinetics are controlled by chemical reaction reactions. Furthermore, the apparent energy activation was estimated to be 6.55 kJ/mol. While cyanidation test revealed a high degree of refractoriness, with silver recoveries of 30% after 48 h, ozone leaching represents an efficient and sustainable alternative for the treatment of silver telluride. This is attributed to the low reaction times, the formation of oxygen as the primary reaction product, and the absence of additional pollutants ions in the system. In this way, ozonation emerges as a promising hydrometallurgical approach for the processing of gold-silver telluride ores.