Raking Effects on Aggregate Densification and Channelling in Thickening
Thickening performance is greatly influenced by aggregate densification and channelling development; however, the microstructures of aggregates and channelling are unable to directly observe because of high turbidity mud bed during thickening. Computed tomography scan imaging technique has been intr...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2019-01-01
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| Series: | Advances in Materials Science and Engineering |
| Online Access: | http://dx.doi.org/10.1155/2019/2463894 |
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| author | Xu Zhou Hong-jiang Wang Hua-zhe Jiao Liu-hua Yang |
| author_facet | Xu Zhou Hong-jiang Wang Hua-zhe Jiao Liu-hua Yang |
| author_sort | Xu Zhou |
| collection | DOAJ |
| description | Thickening performance is greatly influenced by aggregate densification and channelling development; however, the microstructures of aggregates and channelling are unable to directly observe because of high turbidity mud bed during thickening. Computed tomography scan imaging technique has been introduced to investigate the effects of aggregate densification and channelling in the mud bed samples during unclassified tailings thickening. The samples were prepared through deep-freezing and freeze-drying techniques, immediately after sampling from the operation of a pilot thickener. Based on the information of void ratio, pore-size distribution, and permeability, obtained from 3D reconstruction images of the aggregates structure, aggregate densification and channelling development have been characterized. Channelling patterns have been classified by the size and shape of the connection throat of the pore between aggregates. As the aggregate structure broke and densified, the void ratio and pore size of the mud bed were decreased. Thickening performance enhancement was predicted based on solid flux and permeability of mud bed, and the result indicated raking on aggregate densification and channelling apparently improves the unclassified tailings dewatering extent. |
| format | Article |
| id | doaj-art-8cb79bbca6364a3084933ee3afb8baae |
| institution | Kabale University |
| issn | 1687-8434 1687-8442 |
| language | English |
| publishDate | 2019-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Materials Science and Engineering |
| spelling | doaj-art-8cb79bbca6364a3084933ee3afb8baae2025-02-03T01:12:35ZengWileyAdvances in Materials Science and Engineering1687-84341687-84422019-01-01201910.1155/2019/24638942463894Raking Effects on Aggregate Densification and Channelling in ThickeningXu Zhou0Hong-jiang Wang1Hua-zhe Jiao2Liu-hua Yang3School of Civil and Engineering, University of Science and Technology Beijing, Beijing 100083, ChinaSchool of Civil and Engineering, University of Science and Technology Beijing, Beijing 100083, ChinaSchool of Civil Engineering, Henan Polytechnic University, Henan 454003, ChinaSchool of Civil and Engineering, University of Science and Technology Beijing, Beijing 100083, ChinaThickening performance is greatly influenced by aggregate densification and channelling development; however, the microstructures of aggregates and channelling are unable to directly observe because of high turbidity mud bed during thickening. Computed tomography scan imaging technique has been introduced to investigate the effects of aggregate densification and channelling in the mud bed samples during unclassified tailings thickening. The samples were prepared through deep-freezing and freeze-drying techniques, immediately after sampling from the operation of a pilot thickener. Based on the information of void ratio, pore-size distribution, and permeability, obtained from 3D reconstruction images of the aggregates structure, aggregate densification and channelling development have been characterized. Channelling patterns have been classified by the size and shape of the connection throat of the pore between aggregates. As the aggregate structure broke and densified, the void ratio and pore size of the mud bed were decreased. Thickening performance enhancement was predicted based on solid flux and permeability of mud bed, and the result indicated raking on aggregate densification and channelling apparently improves the unclassified tailings dewatering extent.http://dx.doi.org/10.1155/2019/2463894 |
| spellingShingle | Xu Zhou Hong-jiang Wang Hua-zhe Jiao Liu-hua Yang Raking Effects on Aggregate Densification and Channelling in Thickening Advances in Materials Science and Engineering |
| title | Raking Effects on Aggregate Densification and Channelling in Thickening |
| title_full | Raking Effects on Aggregate Densification and Channelling in Thickening |
| title_fullStr | Raking Effects on Aggregate Densification and Channelling in Thickening |
| title_full_unstemmed | Raking Effects on Aggregate Densification and Channelling in Thickening |
| title_short | Raking Effects on Aggregate Densification and Channelling in Thickening |
| title_sort | raking effects on aggregate densification and channelling in thickening |
| url | http://dx.doi.org/10.1155/2019/2463894 |
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