Mechanism of Rake Frame Shear Drainage during Gravity Dewatering of Ultrafine Unclassified Tailings for Paste Preparation
To study the mechanism of reverse percolation and drainage of unclassified tailings, improve the disposal concentration of tailings and solve the bottleneck in the development of filling technology, this study performed semi-industrial flocculation and sedimentation tests using macroscopic continuou...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-02-01
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| Series: | Minerals |
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| Online Access: | https://www.mdpi.com/2075-163X/12/2/240 |
| _version_ | 1797477759493079040 |
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| author | Xinming Chen Jiangling Zhang Huazhe Jiao Kaijian Hu Linhai Wan Zhuen Ruan Liuhua Yang |
| author_facet | Xinming Chen Jiangling Zhang Huazhe Jiao Kaijian Hu Linhai Wan Zhuen Ruan Liuhua Yang |
| author_sort | Xinming Chen |
| collection | DOAJ |
| description | To study the mechanism of reverse percolation and drainage of unclassified tailings, improve the disposal concentration of tailings and solve the bottleneck in the development of filling technology, this study performed semi-industrial flocculation and sedimentation tests using macroscopic continuous thickener tests and a self-developed continuous thickener test platform to observe the evolution pattern and formation mechanism of unclassified tailings flocs. Then, in situ sampling was performed on the compressed thickener zone of tailings at the bottom of the bed with the help of industrial CT scanning tests and 3D images. Avizo software was used to establish the seepage channels and construct an evolutionary model to analyze the effect of tailings dewatering and concentration on tailings concentration from a microscopic perspective. The study shows that the distribution of seepage channels is closely related to the height of the bed. As the bed height increases, the bed concentration increases; shear has a significant effect on the water flow inside the pore space. After shear, the water between the sample pores has been discharged. Therefore, the flow rate is relatively slow. Shear produces pressure and tension effects, breaking the static equilibrium between flocs and water forming seepage channels. Shear can effectively break the floc structure and release the water so that the mutual position between flocs and water constantly changes, The concentration of the tailings bed is increased. |
| first_indexed | 2024-03-09T21:22:17Z |
| format | Article |
| id | doaj.art-f791a1ca3bba484aa13881adac9e8805 |
| institution | Directory Open Access Journal |
| issn | 2075-163X |
| language | English |
| last_indexed | 2024-03-09T21:22:17Z |
| publishDate | 2022-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Minerals |
| spelling | doaj.art-f791a1ca3bba484aa13881adac9e88052023-11-23T21:19:02ZengMDPI AGMinerals2075-163X2022-02-0112224010.3390/min12020240Mechanism of Rake Frame Shear Drainage during Gravity Dewatering of Ultrafine Unclassified Tailings for Paste PreparationXinming Chen0Jiangling Zhang1Huazhe Jiao2Kaijian Hu3Linhai Wan4Zhuen Ruan5Liuhua Yang6School of Civil Engineering, Henan Polytechnic University, Jiaozuo 454003, ChinaSchool of Civil Engineering, Henan Polytechnic University, Jiaozuo 454003, ChinaSchool of Civil Engineering, Henan Polytechnic University, Jiaozuo 454003, ChinaJiangxi Province Key Laboratory of Mining Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, ChinaJiangxi Province Key Laboratory of Mining Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, ChinaSchool of Civil and Resources Engineering, University of Science and Technology Beijing, Beijing 100083, ChinaSchool of Civil Engineering, Henan Polytechnic University, Jiaozuo 454003, ChinaTo study the mechanism of reverse percolation and drainage of unclassified tailings, improve the disposal concentration of tailings and solve the bottleneck in the development of filling technology, this study performed semi-industrial flocculation and sedimentation tests using macroscopic continuous thickener tests and a self-developed continuous thickener test platform to observe the evolution pattern and formation mechanism of unclassified tailings flocs. Then, in situ sampling was performed on the compressed thickener zone of tailings at the bottom of the bed with the help of industrial CT scanning tests and 3D images. Avizo software was used to establish the seepage channels and construct an evolutionary model to analyze the effect of tailings dewatering and concentration on tailings concentration from a microscopic perspective. The study shows that the distribution of seepage channels is closely related to the height of the bed. As the bed height increases, the bed concentration increases; shear has a significant effect on the water flow inside the pore space. After shear, the water between the sample pores has been discharged. Therefore, the flow rate is relatively slow. Shear produces pressure and tension effects, breaking the static equilibrium between flocs and water forming seepage channels. Shear can effectively break the floc structure and release the water so that the mutual position between flocs and water constantly changes, The concentration of the tailings bed is increased.https://www.mdpi.com/2075-163X/12/2/240paste-fillingflocculation and sedimentation teststhree-dimensional reconstructionshear actiondewatering and concentration mechanisms |
| spellingShingle | Xinming Chen Jiangling Zhang Huazhe Jiao Kaijian Hu Linhai Wan Zhuen Ruan Liuhua Yang Mechanism of Rake Frame Shear Drainage during Gravity Dewatering of Ultrafine Unclassified Tailings for Paste Preparation Minerals paste-filling flocculation and sedimentation tests three-dimensional reconstruction shear action dewatering and concentration mechanisms |
| title | Mechanism of Rake Frame Shear Drainage during Gravity Dewatering of Ultrafine Unclassified Tailings for Paste Preparation |
| title_full | Mechanism of Rake Frame Shear Drainage during Gravity Dewatering of Ultrafine Unclassified Tailings for Paste Preparation |
| title_fullStr | Mechanism of Rake Frame Shear Drainage during Gravity Dewatering of Ultrafine Unclassified Tailings for Paste Preparation |
| title_full_unstemmed | Mechanism of Rake Frame Shear Drainage during Gravity Dewatering of Ultrafine Unclassified Tailings for Paste Preparation |
| title_short | Mechanism of Rake Frame Shear Drainage during Gravity Dewatering of Ultrafine Unclassified Tailings for Paste Preparation |
| title_sort | mechanism of rake frame shear drainage during gravity dewatering of ultrafine unclassified tailings for paste preparation |
| topic | paste-filling flocculation and sedimentation tests three-dimensional reconstruction shear action dewatering and concentration mechanisms |
| url | https://www.mdpi.com/2075-163X/12/2/240 |
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