Enhanced ultrafine coal dewatering using flocculation filtration processes |
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| Affiliation: | 1. Department of Mining Engineering, 234E MMRB, University of Kentucky, Lexington, KY 40506-0107, USA;2. Center for Applied Energy Research, University of Kentucky, 2540 Research Park Drive, Lexington, KY 40514, USA;1. Chinese National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, Xuzhou, 221116, Jiangsu, China;2. School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou, 221116, Jiangsu, China;3. School of Electric Power Engineering, China University of Mining and Technology, Xuzhou, 221116, Jiangsu, China;1. School of Chemical Engineering, University of Queensland, St. Lucia, QLD 4072, Australia;2. Pionera, Hjalmar Wesselsvei 6, Sarpsborg, Norway;1. Shaanxi Key Laboratory of Chemical Additives for Industry, College of Chemistry and Chemical Engineering, Shaanxi University of Science & Technology, Xi’an 710021, China;2. Xi’an Changqing Chemical Industry Group Co., Ltd., PetroChina, Xi’an 710000, China;3. Research Institute of Petroleum Engineering Technology, Sinopec Shengli Oilfield, Dongying 257001, China;1. Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650093, China;2. State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming 650093, China |
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| Abstract: | Ultrafine coal (−150 μm) can be effectively cleaned using advanced separation techniques such as column flotation, however, dewatering it to below 20 percent moisture level using the conventional dewatering techniques is difficult. A comparative flocculation filtration study was performed for enhancing dewatering of ultrafine coal using vacuum, hyperbaric, and centrifugal filters. The cationic and anionic flocculants were added into the slurry individually or in combinations.Vacuum filtration results showed that use of flocculants increased filtration rate by several times and/or substantially reduced cake moisture. Combined use of anionic and cationic flocculants showed further improvement. Addition of flocculants significantly increased filtration rate of hyperbaric filtration and reduced cake moisture in centrifugal filtration. Anionic flocculant was more effective in enhancing fine coal dewatering than cationic flocculant in vacuum filtration while cationic flocculant was more effective in high shear centrifugal filtration. A new approach on using flocculants in vacuum filtration is proposed for enhanced fine coal dewatering. |
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