Effects of vacuum conditions on activation of high-alumina fly ash roasted using conventional and microwave heating
In this study, Na _2 CO _3 was used as activator to roast and activate high-alumina fly ash (HAFA), and the vacuum roasting technology was used to enhance the activation process of HAFA. The effects of the vacuum conditions on the activation of HAFA roasted using conventional and microwave heating w...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2020-01-01
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| Series: | Materials Research Express |
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| Online Access: | https://doi.org/10.1088/2053-1591/ab5ecd |
| _version_ | 1797747147822596096 |
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| author | Luyao Kou Junwen Zhou Li Yang Tu Hu Baocheng Zhou |
| author_facet | Luyao Kou Junwen Zhou Li Yang Tu Hu Baocheng Zhou |
| author_sort | Luyao Kou |
| collection | DOAJ |
| description | In this study, Na _2 CO _3 was used as activator to roast and activate high-alumina fly ash (HAFA), and the vacuum roasting technology was used to enhance the activation process of HAFA. The effects of the vacuum conditions on the activation of HAFA roasted using conventional and microwave heating were investigated. It was determined that the reaction time was shortened and the activation effect of HAFA was improved under vacuum conditions; however, the effect of the vacuum conditions on the roasting temperature was negligible. The activation process of HAFA-Na _2 CO _3 mixtures (HAFA/Na _2 CO _3 mass ratio of 1:1) was promoted by conducting conventional and microwave heating experiments under vacuum (−0.04 MPa). The leaching rate of aluminium of 93.00% was reached at the roasting temperature of 900 °C after only 20 min when the HAFA-Na _2 CO _3 mixture was subjected to conventional heating under vacuum, and after 60 min when conventional heating occurred under normal atmospheric pressure. Moreover, the leaching rate of aluminium of 96.00% was reached at the roasting temperature of 700 °C after only 20 min when the HAFA-Na _2 CO _3 mixture underwent microwave heating under vacuum, and after 30 min when microwave heating occurred under normal atmospheric pressure. |
| first_indexed | 2024-03-12T15:47:01Z |
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| id | doaj.art-72038a1631364499b0624599a682e0e8 |
| institution | Directory Open Access Journal |
| issn | 2053-1591 |
| language | English |
| last_indexed | 2024-03-12T15:47:01Z |
| publishDate | 2020-01-01 |
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| series | Materials Research Express |
| spelling | doaj.art-72038a1631364499b0624599a682e0e82023-08-09T15:22:38ZengIOP PublishingMaterials Research Express2053-15912020-01-017202551510.1088/2053-1591/ab5ecdEffects of vacuum conditions on activation of high-alumina fly ash roasted using conventional and microwave heatingLuyao Kou0Junwen Zhou1Li Yang2https://orcid.org/0000-0003-4791-1349Tu Hu3https://orcid.org/0000-0001-6961-3620Baocheng Zhou4https://orcid.org/0000-0003-3834-619XYunnan Provincial Key Laboratory of Intensification Metallurgy, Kunming University of Science and Technology , Kunming, Yunnan 650093, People’s Republic of China; State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology , Kunming, Yunnan 650093, People’s Republic of China; Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology , Kunming, Yunnan 650093, People’s Republic of ChinaYunnan Provincial Key Laboratory of Intensification Metallurgy, Kunming University of Science and Technology , Kunming, Yunnan 650093, People’s Republic of China; State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology , Kunming, Yunnan 650093, People’s Republic of China; Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology , Kunming, Yunnan 650093, People’s Republic of ChinaYunnan Provincial Key Laboratory of Intensification Metallurgy, Kunming University of Science and Technology , Kunming, Yunnan 650093, People’s Republic of China; State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology , Kunming, Yunnan 650093, People’s Republic of China; Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology , Kunming, Yunnan 650093, People’s Republic of ChinaYunnan Provincial Key Laboratory of Intensification Metallurgy, Kunming University of Science and Technology , Kunming, Yunnan 650093, People’s Republic of China; State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology , Kunming, Yunnan 650093, People’s Republic of China; Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology , Kunming, Yunnan 650093, People’s Republic of ChinaYunnan Provincial Key Laboratory of Intensification Metallurgy, Kunming University of Science and Technology , Kunming, Yunnan 650093, People’s Republic of China; State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology , Kunming, Yunnan 650093, People’s Republic of China; Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology , Kunming, Yunnan 650093, People’s Republic of China; Kunming University of Science and Technology Design and Research Institute, ,Kunming, Yunnan 650093, People’s Republic of ChinaIn this study, Na _2 CO _3 was used as activator to roast and activate high-alumina fly ash (HAFA), and the vacuum roasting technology was used to enhance the activation process of HAFA. The effects of the vacuum conditions on the activation of HAFA roasted using conventional and microwave heating were investigated. It was determined that the reaction time was shortened and the activation effect of HAFA was improved under vacuum conditions; however, the effect of the vacuum conditions on the roasting temperature was negligible. The activation process of HAFA-Na _2 CO _3 mixtures (HAFA/Na _2 CO _3 mass ratio of 1:1) was promoted by conducting conventional and microwave heating experiments under vacuum (−0.04 MPa). The leaching rate of aluminium of 93.00% was reached at the roasting temperature of 900 °C after only 20 min when the HAFA-Na _2 CO _3 mixture was subjected to conventional heating under vacuum, and after 60 min when conventional heating occurred under normal atmospheric pressure. Moreover, the leaching rate of aluminium of 96.00% was reached at the roasting temperature of 700 °C after only 20 min when the HAFA-Na _2 CO _3 mixture underwent microwave heating under vacuum, and after 30 min when microwave heating occurred under normal atmospheric pressure.https://doi.org/10.1088/2053-1591/ab5ecdmicrowave heatinghigh-alumina fly ashactivationvacuum |
| spellingShingle | Luyao Kou Junwen Zhou Li Yang Tu Hu Baocheng Zhou Effects of vacuum conditions on activation of high-alumina fly ash roasted using conventional and microwave heating Materials Research Express microwave heating high-alumina fly ash activation vacuum |
| title | Effects of vacuum conditions on activation of high-alumina fly ash roasted using conventional and microwave heating |
| title_full | Effects of vacuum conditions on activation of high-alumina fly ash roasted using conventional and microwave heating |
| title_fullStr | Effects of vacuum conditions on activation of high-alumina fly ash roasted using conventional and microwave heating |
| title_full_unstemmed | Effects of vacuum conditions on activation of high-alumina fly ash roasted using conventional and microwave heating |
| title_short | Effects of vacuum conditions on activation of high-alumina fly ash roasted using conventional and microwave heating |
| title_sort | effects of vacuum conditions on activation of high alumina fly ash roasted using conventional and microwave heating |
| topic | microwave heating high-alumina fly ash activation vacuum |
| url | https://doi.org/10.1088/2053-1591/ab5ecd |
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