Thermal Decomposition and Kinetics of Pentlandite-Bearing Ore Oxidation in the Air Atmosphere

2021
Authors
Božinović, Kristina
Štrbac, Nada

Mitovski, Aleksandra

Sokić, Miroslav

Minić, Duško

Marković, Branislav

Stojanović, Jovica

Article (Published version)
Metadata
Show full item recordAbstract
The roasting of sulfide ores and concentrates is one of the most important steps in pyrometallurgical metal production from primary raw materials, due to the necessity of excess sulfur removal, present in the virgin material. Pentlandite is one of the main sources for nickel pyrometallurgical production. The knowledge of its reaction mechanism, products distribution during oxidation and reaction kinetics is important for optimizing the production process. Raw pentlandite-bearing ore from the Levack mine (Ontario, Canada) was subjected to oxidative roasting in the air atmosphere. A chemical analysis of the initial sample was conducted according to EDXRF (Energy-Dispersive X-ray Fluorescence) and AAS (Atomic Adsorption Spectrometry) results. The characterization of the initial sample and oxidation products was conducted by an XRD (X-ray Diffraction) and SEM/EDS (Scanning Electron Microscopy with Energy Dispersive Spectrometry) analysis. Thermodynamic calculations, a phase analysis and co...nstruction of Kellogg diagrams for Ni-S-O and Fe-S-O systems at 298 K, 773 K, 923 K and 1073 K were used for proposing the theoretical reaction mechanism. A thermal analysis (TG/DTA-Thermogravimetric and Differential Thermal Analyses) was conducted in temperature range 298-1273 K, under a heating rate of 15 degrees min(-1). A kinetic analysis was conducted according to the non-isothermal method of Daniels and Borchardt, under a heating rate of 15 degrees min(-1). Calculated activation energies of 113 kJ mol(-1), 146 kJ mol(-1) and 356 kJ mol(-1) for three oxidation stages imply that in every examined stage of the oxidation process, temperature is a dominant factor determining the reaction rate.
Keywords:
reaction mechanism / phase analysis / pentlandite / oxidationSource:
Metals, 2021, 11, 9Publisher:
- MDPI, Basel
Funding / projects:
- Ministry of Education, Science and Technological Development, Republic of Serbia, Grant no. 200131 (University of Belgrade, Technical Faculty, Bor) (RS-200131)
- Ministry of Education, Science and Technological Development, Republic of Serbia, Grant no. 200023 (Institute of Technology of Nuclear and Other Mineral Row Materials - ITNMS, Belgrade) (RS-200023)
DOI: 10.3390/met11091364
ISSN: 2075-4701
WoS: 000701485700001
Scopus: 2-s2.0-85113865806
Collections
Institution/Community
Institut za tehnologiju nuklearnih i drugih mineralnih sirovinaTY - JOUR AU - Božinović, Kristina AU - Štrbac, Nada AU - Mitovski, Aleksandra AU - Sokić, Miroslav AU - Minić, Duško AU - Marković, Branislav AU - Stojanović, Jovica PY - 2021 UR - https://ritnms.itnms.ac.rs/handle/123456789/569 AB - The roasting of sulfide ores and concentrates is one of the most important steps in pyrometallurgical metal production from primary raw materials, due to the necessity of excess sulfur removal, present in the virgin material. Pentlandite is one of the main sources for nickel pyrometallurgical production. The knowledge of its reaction mechanism, products distribution during oxidation and reaction kinetics is important for optimizing the production process. Raw pentlandite-bearing ore from the Levack mine (Ontario, Canada) was subjected to oxidative roasting in the air atmosphere. A chemical analysis of the initial sample was conducted according to EDXRF (Energy-Dispersive X-ray Fluorescence) and AAS (Atomic Adsorption Spectrometry) results. The characterization of the initial sample and oxidation products was conducted by an XRD (X-ray Diffraction) and SEM/EDS (Scanning Electron Microscopy with Energy Dispersive Spectrometry) analysis. Thermodynamic calculations, a phase analysis and construction of Kellogg diagrams for Ni-S-O and Fe-S-O systems at 298 K, 773 K, 923 K and 1073 K were used for proposing the theoretical reaction mechanism. A thermal analysis (TG/DTA-Thermogravimetric and Differential Thermal Analyses) was conducted in temperature range 298-1273 K, under a heating rate of 15 degrees min(-1). A kinetic analysis was conducted according to the non-isothermal method of Daniels and Borchardt, under a heating rate of 15 degrees min(-1). Calculated activation energies of 113 kJ mol(-1), 146 kJ mol(-1) and 356 kJ mol(-1) for three oxidation stages imply that in every examined stage of the oxidation process, temperature is a dominant factor determining the reaction rate. PB - MDPI, Basel T2 - Metals T1 - Thermal Decomposition and Kinetics of Pentlandite-Bearing Ore Oxidation in the Air Atmosphere IS - 9 VL - 11 DO - 10.3390/met11091364 UR - conv_918 ER -
@article{ author = "Božinović, Kristina and Štrbac, Nada and Mitovski, Aleksandra and Sokić, Miroslav and Minić, Duško and Marković, Branislav and Stojanović, Jovica", year = "2021", abstract = "The roasting of sulfide ores and concentrates is one of the most important steps in pyrometallurgical metal production from primary raw materials, due to the necessity of excess sulfur removal, present in the virgin material. Pentlandite is one of the main sources for nickel pyrometallurgical production. The knowledge of its reaction mechanism, products distribution during oxidation and reaction kinetics is important for optimizing the production process. Raw pentlandite-bearing ore from the Levack mine (Ontario, Canada) was subjected to oxidative roasting in the air atmosphere. A chemical analysis of the initial sample was conducted according to EDXRF (Energy-Dispersive X-ray Fluorescence) and AAS (Atomic Adsorption Spectrometry) results. The characterization of the initial sample and oxidation products was conducted by an XRD (X-ray Diffraction) and SEM/EDS (Scanning Electron Microscopy with Energy Dispersive Spectrometry) analysis. Thermodynamic calculations, a phase analysis and construction of Kellogg diagrams for Ni-S-O and Fe-S-O systems at 298 K, 773 K, 923 K and 1073 K were used for proposing the theoretical reaction mechanism. A thermal analysis (TG/DTA-Thermogravimetric and Differential Thermal Analyses) was conducted in temperature range 298-1273 K, under a heating rate of 15 degrees min(-1). A kinetic analysis was conducted according to the non-isothermal method of Daniels and Borchardt, under a heating rate of 15 degrees min(-1). Calculated activation energies of 113 kJ mol(-1), 146 kJ mol(-1) and 356 kJ mol(-1) for three oxidation stages imply that in every examined stage of the oxidation process, temperature is a dominant factor determining the reaction rate.", publisher = "MDPI, Basel", journal = "Metals", title = "Thermal Decomposition and Kinetics of Pentlandite-Bearing Ore Oxidation in the Air Atmosphere", number = "9", volume = "11", doi = "10.3390/met11091364", url = "conv_918" }
Božinović, K., Štrbac, N., Mitovski, A., Sokić, M., Minić, D., Marković, B.,& Stojanović, J.. (2021). Thermal Decomposition and Kinetics of Pentlandite-Bearing Ore Oxidation in the Air Atmosphere. in Metals MDPI, Basel., 11(9). https://doi.org/10.3390/met11091364 conv_918
Božinović K, Štrbac N, Mitovski A, Sokić M, Minić D, Marković B, Stojanović J. Thermal Decomposition and Kinetics of Pentlandite-Bearing Ore Oxidation in the Air Atmosphere. in Metals. 2021;11(9). doi:10.3390/met11091364 conv_918 .
Božinović, Kristina, Štrbac, Nada, Mitovski, Aleksandra, Sokić, Miroslav, Minić, Duško, Marković, Branislav, Stojanović, Jovica, "Thermal Decomposition and Kinetics of Pentlandite-Bearing Ore Oxidation in the Air Atmosphere" in Metals, 11, no. 9 (2021), https://doi.org/10.3390/met11091364 ., conv_918 .