Kinetics of solid-state oxidation of iron, copper and zinc sulfide mixture
The kinetics of solid-state oxidation by air of iron, copper and zinc sulfide natural mixture, which is typical of the pyritic copper ores, is investigated. Using the high-temperature X-ray powder diffraction, thermogravimetry and differential scanning calorimetry, it was found that the process can...
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| Format: | Article |
| Language: | English |
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Uralʹskij federalʹnyj universitet imeni pervogo Prezidenta Rossii B.N. Elʹcina
2023-03-01
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| Series: | Chimica Techno Acta |
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| Online Access: | https://chimicatechnoacta.ru/article/view/6675 |
| _version_ | 1826921642390978560 |
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| author | Alexander M. Klyushnikov Sergey M. Pikalov Roza I. Gulyaeva |
| author_facet | Alexander M. Klyushnikov Sergey M. Pikalov Roza I. Gulyaeva |
| author_sort | Alexander M. Klyushnikov |
| collection | DOAJ |
| description | The kinetics of solid-state oxidation by air of iron, copper and zinc sulfide natural mixture, which is typical of the pyritic copper ores, is investigated. Using the high-temperature X-ray powder diffraction, thermogravimetry and differential scanning calorimetry, it was found that the process can be represented by five exothermic elementary reactions, corresponding to intensive burning of iron, copper and zinc sulfides, and two endothermic ones, associated with decomposition of copper and iron sulfates. Kinetic analysis is performed by Kissinger and Augis–Bennett methods, the model-free function mechanism was determined from y(α) master plots and iterative optimization of the kinetic parameters. The limiting steps of these reactions are nucleation and crystal growth, and the values of activation energy, pre-exponential factor and Avrami exponent are in the ranges of 140–459 kJ·mol–1, 1.41·104–3.49·1031 s–1, and 1.0–1.7, respectively. Crystallization is followed by an increase in the number of nuclei, which may be formed both at the interface and in the bulk of the ore particles, and crystal growth is one-dimensional and controlled by a chemical reaction at the phase boundary or diffusion. The results of the work can contribute to the development of theoretical ideas about the physicochemical transformations of pyritic ores and concentrates during pyrometallurgical operations. |
| first_indexed | 2024-03-12T23:10:34Z |
| format | Article |
| id | doaj.art-7088d9423ef24609926f7d93fdd9d3ac |
| institution | Directory Open Access Journal |
| issn | 2411-1414 |
| language | English |
| last_indexed | 2025-02-17T13:51:58Z |
| publishDate | 2023-03-01 |
| publisher | Uralʹskij federalʹnyj universitet imeni pervogo Prezidenta Rossii B.N. Elʹcina |
| record_format | Article |
| series | Chimica Techno Acta |
| spelling | doaj.art-7088d9423ef24609926f7d93fdd9d3ac2024-12-25T09:36:55ZengUralʹskij federalʹnyj universitet imeni pervogo Prezidenta Rossii B.N. ElʹcinaChimica Techno Acta2411-14142023-03-0110210.15826/chimtech.2023.10.2.024849Kinetics of solid-state oxidation of iron, copper and zinc sulfide mixtureAlexander M. Klyushnikov0Sergey M. Pikalov1Roza I. Gulyaeva2Institute of Metallurgy of the UB RASInstitute of Metallurgy of the UB RASInstitute of Metallurgy of the UB RASThe kinetics of solid-state oxidation by air of iron, copper and zinc sulfide natural mixture, which is typical of the pyritic copper ores, is investigated. Using the high-temperature X-ray powder diffraction, thermogravimetry and differential scanning calorimetry, it was found that the process can be represented by five exothermic elementary reactions, corresponding to intensive burning of iron, copper and zinc sulfides, and two endothermic ones, associated with decomposition of copper and iron sulfates. Kinetic analysis is performed by Kissinger and Augis–Bennett methods, the model-free function mechanism was determined from y(α) master plots and iterative optimization of the kinetic parameters. The limiting steps of these reactions are nucleation and crystal growth, and the values of activation energy, pre-exponential factor and Avrami exponent are in the ranges of 140–459 kJ·mol–1, 1.41·104–3.49·1031 s–1, and 1.0–1.7, respectively. Crystallization is followed by an increase in the number of nuclei, which may be formed both at the interface and in the bulk of the ore particles, and crystal growth is one-dimensional and controlled by a chemical reaction at the phase boundary or diffusion. The results of the work can contribute to the development of theoretical ideas about the physicochemical transformations of pyritic ores and concentrates during pyrometallurgical operations.https://chimicatechnoacta.ru/article/view/6675iron sulfidecopper sulfidezinc sulfidepyritic copper oreoxidationkinetics |
| spellingShingle | Alexander M. Klyushnikov Sergey M. Pikalov Roza I. Gulyaeva Kinetics of solid-state oxidation of iron, copper and zinc sulfide mixture Chimica Techno Acta iron sulfide copper sulfide zinc sulfide pyritic copper ore oxidation kinetics |
| title | Kinetics of solid-state oxidation of iron, copper and zinc sulfide mixture |
| title_full | Kinetics of solid-state oxidation of iron, copper and zinc sulfide mixture |
| title_fullStr | Kinetics of solid-state oxidation of iron, copper and zinc sulfide mixture |
| title_full_unstemmed | Kinetics of solid-state oxidation of iron, copper and zinc sulfide mixture |
| title_short | Kinetics of solid-state oxidation of iron, copper and zinc sulfide mixture |
| title_sort | kinetics of solid state oxidation of iron copper and zinc sulfide mixture |
| topic | iron sulfide copper sulfide zinc sulfide pyritic copper ore oxidation kinetics |
| url | https://chimicatechnoacta.ru/article/view/6675 |
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