Reaction mechanism and kinetics of sulfide copper concentrate oxidation at elevated temperatures
Abstract
Sulfide copper concentrate from domestic ore deposit (Bor, Serbia) was subjected to oxidation in the air atmosphere due to a better understanding of reaction mechanism and oxidation of various sulfides present in the copper concentrate at elevated temperatures. Results of the initial sample characterization showed that concentrate is chalcopyrite-enargite-tennantite type, with an increased arsenic content. Characterization of the oxidation products showed the presence of sulfates, oxysulfates, and oxides. Based on predominance area diagrams for Me-S-O systems (Me = Cu, Fe, As) combined with thermal analysis results, the reaction mechanism of the oxidation process was proposed. The reactions which occur in the temperature range 25 -1000 degrees C indicate that sulfides are unstable in the oxidative conditions. Sulfides from the initial sample decomposed into binary copper and iron sulfides and volatile arsenic oxides at lower temperatures. Further heating led to oxidation of sulfides in...to iron oxides and copper sulfates and oxysulfates. At higher temperatures sulfates and oxysulfates decomposed into oxides. Kinetic analysis of the oxidation process was done using Ozawa's method in the non-isothermal conditions. The values for activation energies showed that the reactions are chemically controlled and the temperature is the most influential parameter on the reaction rates.
Keywords:
sulfides / roasting / heating rate / enargite / characterizationSource:
Metallurgical & Materials Engineering, 2017, 23, 3, 267-280Publisher:
- Savez inženjera metalurgije Srbije, Beograd
Funding / projects:
Collections
Institution/Community
Institut za tehnologiju nuklearnih i drugih mineralnih sirovinaTY - JOUR AU - Mitovski, Aleksandra AU - Štrbac, Nada AU - Sokić, Miroslav AU - Kragović, Milan AU - Grekulović, Vesna PY - 2017 UR - https://ritnms.itnms.ac.rs/handle/123456789/436 AB - Sulfide copper concentrate from domestic ore deposit (Bor, Serbia) was subjected to oxidation in the air atmosphere due to a better understanding of reaction mechanism and oxidation of various sulfides present in the copper concentrate at elevated temperatures. Results of the initial sample characterization showed that concentrate is chalcopyrite-enargite-tennantite type, with an increased arsenic content. Characterization of the oxidation products showed the presence of sulfates, oxysulfates, and oxides. Based on predominance area diagrams for Me-S-O systems (Me = Cu, Fe, As) combined with thermal analysis results, the reaction mechanism of the oxidation process was proposed. The reactions which occur in the temperature range 25 -1000 degrees C indicate that sulfides are unstable in the oxidative conditions. Sulfides from the initial sample decomposed into binary copper and iron sulfides and volatile arsenic oxides at lower temperatures. Further heating led to oxidation of sulfides into iron oxides and copper sulfates and oxysulfates. At higher temperatures sulfates and oxysulfates decomposed into oxides. Kinetic analysis of the oxidation process was done using Ozawa's method in the non-isothermal conditions. The values for activation energies showed that the reactions are chemically controlled and the temperature is the most influential parameter on the reaction rates. PB - Savez inženjera metalurgije Srbije, Beograd T2 - Metallurgical & Materials Engineering T1 - Reaction mechanism and kinetics of sulfide copper concentrate oxidation at elevated temperatures EP - 280 IS - 3 SP - 267 VL - 23 DO - 10.30544/320 UR - conv_812 ER -
@article{ author = "Mitovski, Aleksandra and Štrbac, Nada and Sokić, Miroslav and Kragović, Milan and Grekulović, Vesna", year = "2017", abstract = "Sulfide copper concentrate from domestic ore deposit (Bor, Serbia) was subjected to oxidation in the air atmosphere due to a better understanding of reaction mechanism and oxidation of various sulfides present in the copper concentrate at elevated temperatures. Results of the initial sample characterization showed that concentrate is chalcopyrite-enargite-tennantite type, with an increased arsenic content. Characterization of the oxidation products showed the presence of sulfates, oxysulfates, and oxides. Based on predominance area diagrams for Me-S-O systems (Me = Cu, Fe, As) combined with thermal analysis results, the reaction mechanism of the oxidation process was proposed. The reactions which occur in the temperature range 25 -1000 degrees C indicate that sulfides are unstable in the oxidative conditions. Sulfides from the initial sample decomposed into binary copper and iron sulfides and volatile arsenic oxides at lower temperatures. Further heating led to oxidation of sulfides into iron oxides and copper sulfates and oxysulfates. At higher temperatures sulfates and oxysulfates decomposed into oxides. Kinetic analysis of the oxidation process was done using Ozawa's method in the non-isothermal conditions. The values for activation energies showed that the reactions are chemically controlled and the temperature is the most influential parameter on the reaction rates.", publisher = "Savez inženjera metalurgije Srbije, Beograd", journal = "Metallurgical & Materials Engineering", title = "Reaction mechanism and kinetics of sulfide copper concentrate oxidation at elevated temperatures", pages = "280-267", number = "3", volume = "23", doi = "10.30544/320", url = "conv_812" }
Mitovski, A., Štrbac, N., Sokić, M., Kragović, M.,& Grekulović, V.. (2017). Reaction mechanism and kinetics of sulfide copper concentrate oxidation at elevated temperatures. in Metallurgical & Materials Engineering Savez inženjera metalurgije Srbije, Beograd., 23(3), 267-280. https://doi.org/10.30544/320 conv_812
Mitovski A, Štrbac N, Sokić M, Kragović M, Grekulović V. Reaction mechanism and kinetics of sulfide copper concentrate oxidation at elevated temperatures. in Metallurgical & Materials Engineering. 2017;23(3):267-280. doi:10.30544/320 conv_812 .
Mitovski, Aleksandra, Štrbac, Nada, Sokić, Miroslav, Kragović, Milan, Grekulović, Vesna, "Reaction mechanism and kinetics of sulfide copper concentrate oxidation at elevated temperatures" in Metallurgical & Materials Engineering, 23, no. 3 (2017):267-280, https://doi.org/10.30544/320 ., conv_812 .