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Describing the adsorption of PAM on coal/kaolinite surface in aquatic by combining experiments and MD simulation. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.121152] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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Effect of Ultrasonic Pretreatment on Flocculation Filtration of Low-Rank Coal Slurry. Molecules 2022; 27:molecules27196460. [PMID: 36234998 PMCID: PMC9572005 DOI: 10.3390/molecules27196460] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2022] [Revised: 09/26/2022] [Accepted: 09/27/2022] [Indexed: 11/17/2022] Open
Abstract
The efficient filtration of low-rank coal (LRC) slurry was significantly beneficial to the production process of wet coal beneficiation. However, relatively few studies have been reported on novel pretreatment methods for the efficient filtration of LRC slurry. In this paper, the mechanism of ultrasonic pretreatment to promote flocculation and filtration of slurry was studied. The hydrophobic variation of the slurry surface was measured by contact angle and XPS. The flocculation properties of slurry were characterized using zeta potential and FBRM. The effects of filter cake porosity and ultrasonic pretreatment on slurry filtration resistance were calculated by L-F NMR and Darcy's theory. The results showed that the ultrasonic pretreatment promoted the flocculation and filtration performance of LRC slurry, increased the filtration rate, and decreased the cake moisture content. Meanwhile, the contact angle of LRC increased significantly from 50.1° to 67.8° after ultrasonic pretreatment, and the surface tension of the filtrate decreased from 69.5 to 53.31 mN/m. Ultrasonic pretreatment reduced the absolute value of the zeta potential of coal slurry from 24.8 to 21.0 mV, and the average chord length of flocs increased from 5-10 μm to 25-30 μm, thus weakening the electrostatic repulsion between coals to promote floc formation. In addition, the pore tests and filtration theory calculations showed that the ultrasonic pretreatment significantly improved the permeability of the filter cake to water and reduced the resistance to slurry during filtration. In particular, the mesopore porosity increased by 9.18%, and the permeability increased by 2.937 × 108 m2. Therefore, this contributed to the reduction of slurry filtration resistance. This research provides an efficient method for promoting the efficient filtration of slurry.
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Guo X, Li K, Zhou P, Liang J, Gu JN, Xue Y, Guo M, Sun T, Jia J. Insight into the Enhanced Removal of Water from Coal Slime via Solar Drying Technology: Dewatering Performance, Solar Thermal Efficiency, and Economic Analysis. ACS OMEGA 2022; 7:6710-6720. [PMID: 35252666 PMCID: PMC8892639 DOI: 10.1021/acsomega.1c06197] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/04/2021] [Accepted: 02/02/2022] [Indexed: 06/14/2023]
Abstract
In this work, solar drying technology was applied for the deep dewatering of coal slime to save thermal energy and reduce the dust produced during the hot drying process of coal slime. Solar drying technology is used to dry coal slime to realize its resource utilization. The influence of solar radiation intensity and slime thickness is investigated on the drying process. The greater the solar radiation intensity (SRI) is, the faster the drying indoor air and coal slime are heated, and the faster the drying efficiency is. As the slime becomes thinner, the internal water diffusion resistance becomes smaller and the drying efficiency correspondingly becomes faster. In addition, to facilitate the application of coal slime drying in the actual project, the Page model is fitted and found to have a good fit for solar drying coal slime. Meanwhile, the optimal drying conditions are determined by analyzing the energy utilization under different conditions. It is found that the target moisture content of 10% is optimal for coal slime drying with the highest energy utilization. The laying thickness (L) of 1 cm has the highest solar thermal efficiency of 54.1%. More importantly, economic calculation and analysis are conducted in detail on solar drying. It is found that the cost of solar drying (¥38.59/ton) is lower than that of hot air drying (¥ 65.09/ton). Therefore, solar drying is a promising method for the drying of coal slime.
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Affiliation(s)
- Xin Guo
- School
of Environmental Science and Engineering, Shanghai Jiao Tong University, No. 800, Dongchuan Road, Shanghai 200240, P.R.
China
| | - Kan Li
- School
of Environmental Science and Engineering, Shanghai Jiao Tong University, No. 800, Dongchuan Road, Shanghai 200240, P.R.
China
| | - Pin Zhou
- Research
Center of Secondary Resources and Environment, 666 Liaohe Road, Changzhou Institute of Technology, Changzhou 213032, P.R. China
| | - Jianxing Liang
- School
of Environmental Science and Engineering, Shanghai Jiao Tong University, No. 800, Dongchuan Road, Shanghai 200240, P.R.
China
| | - Jia-nan Gu
- School
of Environmental Science and Engineering, Shanghai Jiao Tong University, No. 800, Dongchuan Road, Shanghai 200240, P.R.
China
| | - Yixin Xue
- School
of Environmental Science and Engineering, Shanghai Jiao Tong University, No. 800, Dongchuan Road, Shanghai 200240, P.R.
China
| | - Mingming Guo
- School
of Environmental Science and Engineering, Shanghai Jiao Tong University, No. 800, Dongchuan Road, Shanghai 200240, P.R.
China
- Shanghai
Engineering Research Center of Solid Waste Treatment and Resource
Recovery, Shanghai 200240, P.R. China
- Chongqing
Research Institute of Shanghai Jiaotong University, Chongqing 401120, P.R. China
| | - Tonghua Sun
- School
of Environmental Science and Engineering, Shanghai Jiao Tong University, No. 800, Dongchuan Road, Shanghai 200240, P.R.
China
- Shanghai
Engineering Research Center of Solid Waste Treatment and Resource
Recovery, Shanghai 200240, P.R. China
| | - Jinping Jia
- School
of Environmental Science and Engineering, Shanghai Jiao Tong University, No. 800, Dongchuan Road, Shanghai 200240, P.R.
China
- Shanghai
Institute of Pollution Control and Ecological Security, Shanghai 200092, P.R. China
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Pan M, Wang W, Duan C, Jiang H, Zhao Y, Qiao J, Huang L, Wang Z, Shen Y, Shi W. Process enhancement of vibrating classifier for tailings classification-dewatering and industrial application. POWDER TECHNOL 2022. [DOI: 10.1016/j.powtec.2022.117219] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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