Effect of mechanical and chemical clay removals by hydrocyclone and dispersants on coal flotation |
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| Authors: | William J Oats Orhan Ozdemir Anh V Nguyen |
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| Affiliation: | 1. Water Research Centre for Agriculture and Mining (CRHIAM), University of Concepcion, Chile;2. N.B. Keevil Institute of Mining Engineering, University of British Columbia, Canada;3. Department of Metallurgical Engineering, University of Concepcion, Chile;1. School of Chemical & Environmental Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China;2. Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada;1. School of Chemistry and Chemical Engineering, Xi’an University of Science and Technology, Xi’an, Shanxi, 710054, China;2. Key Laboratory of Coal Resources Exploration and Comprehensive Utilization, Ministry of Land and Resources, Xi’an, Shanxi, 710021, China;3. Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta, T6G 1H9, Canada;4. College of Chemical and Environmental Engineering, Shandong University of Science and Technology, Qingdao, Shandong, 266590, China;1. School of Chemical Engineering, University of Queensland, St. Lucia, QLD 4072, Australia;2. Pionera, Hjalmar Wesselsvei 6, Sarpsborg, Norway;1. Key Laboratory of Coal Processing and Efficient Utilization of Ministry of Education, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China;2. School of Chemical Engineering, The University of Queensland, St Lucia 4072, Queensland, Australia |
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| Abstract: | Fine minerals, mostly clays, are known to have a detrimental effect on coal flotation. This paper focuses on the effect of mechanical and chemical removals of fine minerals by hydrocyclone and dispersants on coal flotation. The experimental results showed that the flotation recovery slightly increased from medium acidic to medium alkaline ranges. The flotation experiments carried out with dispersants at different dosages showed that the dispersants did not enhance the flotation recovery significantly. However, the removal of the fine fraction from the feed using a hydrocyclone significantly increased the flotation recovery. The bubble–particle attachment tests also indicated that the attachment time between an air bubble and the coal particles increased in the presence of clay particles. These attachment time results clearly showed that the clay particles adversely affected the flotation of coal particles by covering the coal surfaces which reduced the efficiency of bubble–coal attachment. An analysis based on the colloid stability theory showed that the clay coating was governed by the van der Waals attraction and that the double-layer interaction played a secondary role. It was also concluded that the best way to increase the flotation recovery in the presence of clays was to remove these fine minerals by mechanical means such as hydrocylones. |
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