Optimizing rotary kiln operations for molybdenite concentrate oxidation roasting to produce molybdic trioxide
The effects of the rotational speed (0–10 rpm) and temperature (550–650 °C) of rotary kiln drums on the oxidation roasting of molybdenite (MoS2) concentrate was investigated in this study. Computational predictions indicated that production of MoO2 was more favorable than that of MoO3 up to a certai...
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Elsevier
2024-11-01
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| Series: | Chemical Engineering Journal Advances |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666821124000590 |
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| author | Jungho Heo Seunghyeon Baek Kurniawan Kurniawan Seongsoo Han Youngjae Kim Hyunsik Park Joobeom Seo |
| author_facet | Jungho Heo Seunghyeon Baek Kurniawan Kurniawan Seongsoo Han Youngjae Kim Hyunsik Park Joobeom Seo |
| author_sort | Jungho Heo |
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| description | The effects of the rotational speed (0–10 rpm) and temperature (550–650 °C) of rotary kiln drums on the oxidation roasting of molybdenite (MoS2) concentrate was investigated in this study. Computational predictions indicated that production of MoO2 was more favorable than that of MoO3 up to a certain stage of the oxidation roasting process, after which MoO3 is produced through the consumption of MoO2. Thus, understanding the MoS2–MoO2–MoO3 relationship and its equilibrium is important. A drum rotational speed > 5 rpm significantly increased the S reduction rate and considerably decreased the S content at 60 min to < approx. 5 %. Additionally, the S content at 60 min decreased with decreasing the temperature from 650 to 550 °C due to the MoS2 concentrate exothermic reaction during oxidation roasting. The MoS2 to MoxOy (≈ MoO2+MoO3) conversion rate (%) was generally proportional to the rotational speed and reaction duration. X-ray diffraction analysis indicated that 5–10 rpm and 550–600 °C yielded a higher experimental conversion rate (97–98 %). Furthermore, the MoO2 and MoO3 conversions were separately quantified. Agglomeration was more pronounced without drum rotation and at higher temperatures. Analysis of the reaction kinetics using the unreacted-core model indicated that diffusion through the gas film layer is supported by the 20.9 kJ/mol activation energy obtained from the Arrhenius plot. Consequently, an appropriate drum rotational speed at a relatively low temperature is a prerequisite for producing MoO3 through the oxidation roasting of MoS2 concentrates in a rotary kiln. |
| format | Article |
| id | doaj-art-b12f5b28bd59476ca44d9162c32cbd2e |
| institution | OA Journals |
| issn | 2666-8211 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Chemical Engineering Journal Advances |
| spelling | doaj-art-b12f5b28bd59476ca44d9162c32cbd2e2025-08-20T02:38:32ZengElsevierChemical Engineering Journal Advances2666-82112024-11-012010064210.1016/j.ceja.2024.100642Optimizing rotary kiln operations for molybdenite concentrate oxidation roasting to produce molybdic trioxideJungho Heo0Seunghyeon Baek1Kurniawan Kurniawan2Seongsoo Han3Youngjae Kim4Hyunsik Park5Joobeom Seo6Resources Utilization Division, Korea Institute of Geoscience and Mineral Resources (KIGAM), Daejeon, 34132, KoreaResources Utilization Division, Korea Institute of Geoscience and Mineral Resources (KIGAM), Daejeon, 34132, KoreaResources Utilization Division, Korea Institute of Geoscience and Mineral Resources (KIGAM), Daejeon, 34132, Korea; Resources Recycling, University of Science and Technology (UST), 34113, Daejeon, KoreaResources Utilization Division, Korea Institute of Geoscience and Mineral Resources (KIGAM), Daejeon, 34132, KoreaDepartment of Materials Science and Engineering, Inha University, 22212, Incheon, KoreaResources Utilization Division, Korea Institute of Geoscience and Mineral Resources (KIGAM), Daejeon, 34132, Korea; Department of Mining Engineering, Colorado School of Mines, Golden, CO 80401, USAResources Utilization Division, Korea Institute of Geoscience and Mineral Resources (KIGAM), Daejeon, 34132, Korea; Corresponding author.The effects of the rotational speed (0–10 rpm) and temperature (550–650 °C) of rotary kiln drums on the oxidation roasting of molybdenite (MoS2) concentrate was investigated in this study. Computational predictions indicated that production of MoO2 was more favorable than that of MoO3 up to a certain stage of the oxidation roasting process, after which MoO3 is produced through the consumption of MoO2. Thus, understanding the MoS2–MoO2–MoO3 relationship and its equilibrium is important. A drum rotational speed > 5 rpm significantly increased the S reduction rate and considerably decreased the S content at 60 min to < approx. 5 %. Additionally, the S content at 60 min decreased with decreasing the temperature from 650 to 550 °C due to the MoS2 concentrate exothermic reaction during oxidation roasting. The MoS2 to MoxOy (≈ MoO2+MoO3) conversion rate (%) was generally proportional to the rotational speed and reaction duration. X-ray diffraction analysis indicated that 5–10 rpm and 550–600 °C yielded a higher experimental conversion rate (97–98 %). Furthermore, the MoO2 and MoO3 conversions were separately quantified. Agglomeration was more pronounced without drum rotation and at higher temperatures. Analysis of the reaction kinetics using the unreacted-core model indicated that diffusion through the gas film layer is supported by the 20.9 kJ/mol activation energy obtained from the Arrhenius plot. Consequently, an appropriate drum rotational speed at a relatively low temperature is a prerequisite for producing MoO3 through the oxidation roasting of MoS2 concentrates in a rotary kiln.http://www.sciencedirect.com/science/article/pii/S2666821124000590Molybdenite concentrate oxidationRotary kilnConversion rateReaction kineticsActivation energy |
| spellingShingle | Jungho Heo Seunghyeon Baek Kurniawan Kurniawan Seongsoo Han Youngjae Kim Hyunsik Park Joobeom Seo Optimizing rotary kiln operations for molybdenite concentrate oxidation roasting to produce molybdic trioxide Chemical Engineering Journal Advances Molybdenite concentrate oxidation Rotary kiln Conversion rate Reaction kinetics Activation energy |
| title | Optimizing rotary kiln operations for molybdenite concentrate oxidation roasting to produce molybdic trioxide |
| title_full | Optimizing rotary kiln operations for molybdenite concentrate oxidation roasting to produce molybdic trioxide |
| title_fullStr | Optimizing rotary kiln operations for molybdenite concentrate oxidation roasting to produce molybdic trioxide |
| title_full_unstemmed | Optimizing rotary kiln operations for molybdenite concentrate oxidation roasting to produce molybdic trioxide |
| title_short | Optimizing rotary kiln operations for molybdenite concentrate oxidation roasting to produce molybdic trioxide |
| title_sort | optimizing rotary kiln operations for molybdenite concentrate oxidation roasting to produce molybdic trioxide |
| topic | Molybdenite concentrate oxidation Rotary kiln Conversion rate Reaction kinetics Activation energy |
| url | http://www.sciencedirect.com/science/article/pii/S2666821124000590 |
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