Aggregate size and density after shearing,implications for dewatering fine tailings with hydrocyclones |
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| Institution: | 1. School of Computer Engineering, Nanyang Technological University, Singapore;2. CIST, Korea University, Seoul, South Korea;1. School of Resources and Safety Engineering, Central South University, Changsha, 410083, China;2. School of Civil, Environmental and Mining Engineering, University of Western Australia, Perth, 6009, Australia;3. University of Transport Technology, Hanoi, 100000, Viet Nam;4. Institute of Research and Development, Duy Tan University, Da Nang, 550000, Viet Nam;5. Faculty of Engineering, Vietnam National University of Agriculture, Gia Lam, Hanoi, 100000, Viet Nam;1. Institute of Particle Science & Engineering, School of Chemical & Process Engineering, University of Leeds, Leeds, LS2 9JT, United Kingdom;2. Particulate Fluids Processing Centre,Department of Chemical and Biomolecular Engineering, The University of Melbourne, Victoria 3010, Australia;1. School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China;2. State Key Laboratory of Mineral Processing, Beijing 100160, China;3. School of Chemical and Processing Engineering, University of Leeds, Leeds LS29JT, UK |
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| Abstract: | Experiments have been conducted in a shear cell in order to provide insight into the separation of flocs by size and density in a hydrocyclone. The size of the aggregates was measured after shearing at a rate comparable to that found within a typical hydrocyclone. Two types of coal tailings from the Hunter Valley, NSW Australia with average sizes of about 0.4 μm and 10 μm were investigated. The size of aggregates after shearing was measured for a range of different polymeric flocculants of varying molecular weight and charge density. Under certain conditions 90% of the aggregates from the submicron tailings have size greater than 38 μm after shear at 1200 s? 1 for 30 s. The aggregates produced from the 10 μm tailings had over 90% larger than 82 μm with the flocculants tested. The size of the aggregates remained sufficiently large after shearing to be suitable for hydrocyclone dewatering. The density of the aggregates was calculated from the aggregate size and mass fractal dimension. The small difference between the density of the aggregates and water was found to be the factor limiting their velocity under the applied centrifugal acceleration. |
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