Academic Journal
Effects of vacuum conditions on activation of high-alumina fly ash roasted using conventional and microwave heating
| Title: | Effects of vacuum conditions on activation of high-alumina fly ash roasted using conventional and microwave heating |
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| Authors: | Luyao Kou, Junwen Zhou, Li Yang, Tu Hu, Baocheng Zhou |
| Source: | Materials Research Express, Vol 7, Iss 2, p 025515 (2020) |
| Publisher Information: | IOP Publishing, 2020. |
| Publication Year: | 2020 |
| Collection: | LCC:Materials of engineering and construction. Mechanics of materials LCC:Chemical technology |
| Subject Terms: | microwave heating, high-alumina fly ash, activation, vacuum, Materials of engineering and construction. Mechanics of materials, TA401-492, Chemical technology, TP1-1185 |
| More Details: | 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. |
| Document Type: | article |
| File Description: | electronic resource |
| Language: | English |
| ISSN: | 2053-1591 |
| Relation: | https://doaj.org/toc/2053-1591 |
| DOI: | 10.1088/2053-1591/ab5ecd |
| Access URL: | https://doaj.org/article/72038a1631364499b0624599a682e0e8 |
| Accession Number: | edsdoj.72038a1631364499b0624599a682e0e8 |
| Database: | Directory of Open Access Journals |
| ISSN: | 20531591 |
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| DOI: | 10.1088/2053-1591/ab5ecd |
| Published in: | Materials Research Express |
| Language: | English |