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<p>This study examines the thermal decomposition of copper ferrite-type compounds and CuO formed during the oxidative dead roasting of copper concentrates. The investigation integrates laboratory-scale experiments that characterize the kinetics of the decomposition with thermodynamic modeling to analyze the behavior of these compounds. The results reveal that copper-rich phases (designated as Cu–Ox-(Fe)) and CuO undergo substantial transformations, characterized by the migration of copper cations into iron-rich phases such as CuFeO₂ and other non-stoichiometric Cu–Fe oxides (designated as Fe–Ox–Cu)). These transformations occur within a temperature range of 800–1100&#xa0;°C, with oxygen release directly linked to the destabilization of Cu–O-dominated phases. Kinetic analyses indicate that the reaction order with respect to oxygen partial pressure varies across the decomposition stages. The process aligns with a zero-order reaction model in the early heating phases, while a second-order model best describes later stages. Additionally, the continuous removal of oxygen during the decomposition significantly shifts system equilibria, altering the formation temperatures of critical phases. Thermodynamic simulations using FactSage 8.3 demonstrate that the decomposition of CuO to Cu₂O initiates at approximately 800&#xa0;°C and can extend up to 1100&#xa0;°C, depending on the oxygen partial pressure regulated at laboratory level by the N₂ flow rate, but also influenced by the release of oxygen from the samples. This study provides valuable insights into the thermal decomposition mechanisms of ferrite-type complex systems, emphasizing the pivotal role of Cu–O interactions and the importance of precise control over experimental conditions.</p>

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Characterization of thermal decomposition of Cu–Fe-type ferrites compounds obtained by oxidative roasting of copper concentrates

  • 期刊论文

  • 发表日期：

    2025年11月4日

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  • Karina Garcia,
  • Camila Mora,
  • Gonzalo Reyes,
  • Igor Wilkomirsky,
  • Roberto Parra

摘要

This study examines the thermal decomposition of copper ferrite-type compounds and CuO formed during the oxidative dead roasting of copper concentrates. The investigation integrates laboratory-scale experiments that characterize the kinetics of the decomposition with thermodynamic modeling to analyze the behavior of these compounds. The results reveal that copper-rich phases (designated as Cu–Ox-(Fe)) and CuO undergo substantial transformations, characterized by the migration of copper cations into iron-rich phases such as CuFeO₂ and other non-stoichiometric Cu–Fe oxides (designated as Fe–Ox–Cu)). These transformations occur within a temperature range of 800–1100 °C, with oxygen release directly linked to the destabilization of Cu–O-dominated phases. Kinetic analyses indicate that the reaction order with respect to oxygen partial pressure varies across the decomposition stages. The process aligns with a zero-order reaction model in the early heating phases, while a second-order model best describes later stages. Additionally, the continuous removal of oxygen during the decomposition significantly shifts system equilibria, altering the formation temperatures of critical phases. Thermodynamic simulations using FactSage 8.3 demonstrate that the decomposition of CuO to Cu₂O initiates at approximately 800 °C and can extend up to 1100 °C, depending on the oxygen partial pressure regulated at laboratory level by the N₂ flow rate, but also influenced by the release of oxygen from the samples. This study provides valuable insights into the thermal decomposition mechanisms of ferrite-type complex systems, emphasizing the pivotal role of Cu–O interactions and the importance of precise control over experimental conditions.