The Process of the Intensification of Coal Fly Ash Flotation Using a Stirred Tank
Pulp preconditioning using a stirred tank as a pretreatment process is vital to the flotation system, which can be used to improve the flotation efficiency of mineral particles. The kinetic energy that is dissipated in the stirred tank could strengthen the interaction process between mineral particl...
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| Veröffentlicht in: | Minerals (Basel) 2018-12, Vol.8 (12), p.597 |
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| creator | Yang, Lu Zhu, Zhenna Qi, Xin Yan, Xiaokang Zhang, Haijun |
| description | Pulp preconditioning using a stirred tank as a pretreatment process is vital to the flotation system, which can be used to improve the flotation efficiency of mineral particles. The kinetic energy that is dissipated in the stirred tank could strengthen the interaction process between mineral particles and flotation reagents to improve the flotation efficiency in the presence of the preconditioning. In this paper, the effect of the conditioning speed on the coal fly ash flotation was investigated using numerical simulations and conditioning-flotation tests. The large eddy simulation coupled with the Smagorinsky-Lilly subgrid model was employed to simulate the turbulence flow field in the stirred tank, which was equipped with a six blade Rushton turbine. The impeller rotation was modelled using the sliding mesh. The simulation results showed that the large eddy simulation (LES) well matched the previous experimental data. The turbulence characteristics, such as the mean velocity, turbulent kinetic energy, power consumption and instantaneous structures of trailing vortices were analysed in detail. The turbulent length scale (η) decreased as the rotation speed increased, and the minimum value of η was almost unchanged when the rotation speed was more than 1200 rpm. The conditioning-flotation tests of coal fly ash were conducted using different conditioning speeds. The results showed that the removal of unburned carbon was greatly improved due to the strengthened turbulence in the stirred tank, and the optimal results were obtained with an LOI of 3.32%, a yield of 78.69% and an RUC of 80.89% when the conditioning speed was 1200 rpm. |
| doi_str_mv | 10.3390/min8120597 |
| format | Article |
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The kinetic energy that is dissipated in the stirred tank could strengthen the interaction process between mineral particles and flotation reagents to improve the flotation efficiency in the presence of the preconditioning. In this paper, the effect of the conditioning speed on the coal fly ash flotation was investigated using numerical simulations and conditioning-flotation tests. The large eddy simulation coupled with the Smagorinsky-Lilly subgrid model was employed to simulate the turbulence flow field in the stirred tank, which was equipped with a six blade Rushton turbine. The impeller rotation was modelled using the sliding mesh. The simulation results showed that the large eddy simulation (LES) well matched the previous experimental data. The turbulence characteristics, such as the mean velocity, turbulent kinetic energy, power consumption and instantaneous structures of trailing vortices were analysed in detail. The turbulent length scale (η) decreased as the rotation speed increased, and the minimum value of η was almost unchanged when the rotation speed was more than 1200 rpm. The conditioning-flotation tests of coal fly ash were conducted using different conditioning speeds. The results showed that the removal of unburned carbon was greatly improved due to the strengthened turbulence in the stirred tank, and the optimal results were obtained with an LOI of 3.32%, a yield of 78.69% and an RUC of 80.89% when the conditioning speed was 1200 rpm.</description><identifier>ISSN: 2075-163X</identifier><identifier>EISSN: 2075-163X</identifier><identifier>DOI: 10.3390/min8120597</identifier><language>eng</language><publisher>Basel: MDPI AG</publisher><subject>Carbon ; Coal ; Computational fluid dynamics ; Computer applications ; Deformation ; Eddy viscosity ; Education ; Efficiency ; Energy ; Energy dissipation ; Energy exchange ; Flotation ; Flotation reagents ; Fluid dynamics ; Fluid flow ; Fluid mechanics ; Fly ash ; Higher education institutions ; Investigations ; Kinematic viscosity ; Kinematics ; Kinetic energy ; Mixing length ; Natural sciences ; Navier-Stokes equations ; Numerical analysis ; Preconditioning ; Reagents ; Reynolds number ; Simulation ; Surfactants ; Tensors ; Turbines ; Turbulent flow ; Viscosity ; Vortices</subject><ispartof>Minerals (Basel), 2018-12, Vol.8 (12), p.597</ispartof><rights>2018. This work is licensed under https://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c361t-26e0fc6afa1f5130e7ac5633f2ec45c41989da5b6fe5082315a825777c6a471f3</citedby><cites>FETCH-LOGICAL-c361t-26e0fc6afa1f5130e7ac5633f2ec45c41989da5b6fe5082315a825777c6a471f3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,27903,27904</link.rule.ids></links><search><creatorcontrib>Yang, Lu</creatorcontrib><creatorcontrib>Zhu, Zhenna</creatorcontrib><creatorcontrib>Qi, Xin</creatorcontrib><creatorcontrib>Yan, Xiaokang</creatorcontrib><creatorcontrib>Zhang, Haijun</creatorcontrib><title>The Process of the Intensification of Coal Fly Ash Flotation Using a Stirred Tank</title><title>Minerals (Basel)</title><description>Pulp preconditioning using a stirred tank as a pretreatment process is vital to the flotation system, which can be used to improve the flotation efficiency of mineral particles. The kinetic energy that is dissipated in the stirred tank could strengthen the interaction process between mineral particles and flotation reagents to improve the flotation efficiency in the presence of the preconditioning. In this paper, the effect of the conditioning speed on the coal fly ash flotation was investigated using numerical simulations and conditioning-flotation tests. The large eddy simulation coupled with the Smagorinsky-Lilly subgrid model was employed to simulate the turbulence flow field in the stirred tank, which was equipped with a six blade Rushton turbine. The impeller rotation was modelled using the sliding mesh. The simulation results showed that the large eddy simulation (LES) well matched the previous experimental data. The turbulence characteristics, such as the mean velocity, turbulent kinetic energy, power consumption and instantaneous structures of trailing vortices were analysed in detail. The turbulent length scale (η) decreased as the rotation speed increased, and the minimum value of η was almost unchanged when the rotation speed was more than 1200 rpm. The conditioning-flotation tests of coal fly ash were conducted using different conditioning speeds. The results showed that the removal of unburned carbon was greatly improved due to the strengthened turbulence in the stirred tank, and the optimal results were obtained with an LOI of 3.32%, a yield of 78.69% and an RUC of 80.89% when the conditioning speed was 1200 rpm.</description><subject>Carbon</subject><subject>Coal</subject><subject>Computational fluid dynamics</subject><subject>Computer applications</subject><subject>Deformation</subject><subject>Eddy viscosity</subject><subject>Education</subject><subject>Efficiency</subject><subject>Energy</subject><subject>Energy dissipation</subject><subject>Energy exchange</subject><subject>Flotation</subject><subject>Flotation reagents</subject><subject>Fluid dynamics</subject><subject>Fluid flow</subject><subject>Fluid mechanics</subject><subject>Fly ash</subject><subject>Higher education institutions</subject><subject>Investigations</subject><subject>Kinematic viscosity</subject><subject>Kinematics</subject><subject>Kinetic energy</subject><subject>Mixing length</subject><subject>Natural sciences</subject><subject>Navier-Stokes equations</subject><subject>Numerical analysis</subject><subject>Preconditioning</subject><subject>Reagents</subject><subject>Reynolds number</subject><subject>Simulation</subject><subject>Surfactants</subject><subject>Tensors</subject><subject>Turbines</subject><subject>Turbulent 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Process of the Intensification of Coal Fly Ash Flotation Using a Stirred Tank</title><author>Yang, Lu ; Zhu, Zhenna ; Qi, Xin ; Yan, Xiaokang ; Zhang, Haijun</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c361t-26e0fc6afa1f5130e7ac5633f2ec45c41989da5b6fe5082315a825777c6a471f3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2018</creationdate><topic>Carbon</topic><topic>Coal</topic><topic>Computational fluid dynamics</topic><topic>Computer applications</topic><topic>Deformation</topic><topic>Eddy viscosity</topic><topic>Education</topic><topic>Efficiency</topic><topic>Energy</topic><topic>Energy dissipation</topic><topic>Energy exchange</topic><topic>Flotation</topic><topic>Flotation reagents</topic><topic>Fluid dynamics</topic><topic>Fluid flow</topic><topic>Fluid mechanics</topic><topic>Fly ash</topic><topic>Higher education institutions</topic><topic>Investigations</topic><topic>Kinematic viscosity</topic><topic>Kinematics</topic><topic>Kinetic energy</topic><topic>Mixing length</topic><topic>Natural sciences</topic><topic>Navier-Stokes equations</topic><topic>Numerical analysis</topic><topic>Preconditioning</topic><topic>Reagents</topic><topic>Reynolds number</topic><topic>Simulation</topic><topic>Surfactants</topic><topic>Tensors</topic><topic>Turbines</topic><topic>Turbulent flow</topic><topic>Viscosity</topic><topic>Vortices</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Yang, Lu</creatorcontrib><creatorcontrib>Zhu, Zhenna</creatorcontrib><creatorcontrib>Qi, Xin</creatorcontrib><creatorcontrib>Yan, Xiaokang</creatorcontrib><creatorcontrib>Zhang, Haijun</creatorcontrib><collection>CrossRef</collection><collection>ProQuest Central (Corporate)</collection><collection>Oceanic Abstracts</collection><collection>Water Resources Abstracts</collection><collection>ABI/INFORM Collection</collection><collection>ABI/INFORM Global 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Tank</atitle><jtitle>Minerals (Basel)</jtitle><date>2018-12-01</date><risdate>2018</risdate><volume>8</volume><issue>12</issue><spage>597</spage><pages>597-</pages><issn>2075-163X</issn><eissn>2075-163X</eissn><abstract>Pulp preconditioning using a stirred tank as a pretreatment process is vital to the flotation system, which can be used to improve the flotation efficiency of mineral particles. The kinetic energy that is dissipated in the stirred tank could strengthen the interaction process between mineral particles and flotation reagents to improve the flotation efficiency in the presence of the preconditioning. In this paper, the effect of the conditioning speed on the coal fly ash flotation was investigated using numerical simulations and conditioning-flotation tests. The large eddy simulation coupled with the Smagorinsky-Lilly subgrid model was employed to simulate the turbulence flow field in the stirred tank, which was equipped with a six blade Rushton turbine. The impeller rotation was modelled using the sliding mesh. The simulation results showed that the large eddy simulation (LES) well matched the previous experimental data. The turbulence characteristics, such as the mean velocity, turbulent kinetic energy, power consumption and instantaneous structures of trailing vortices were analysed in detail. The turbulent length scale (η) decreased as the rotation speed increased, and the minimum value of η was almost unchanged when the rotation speed was more than 1200 rpm. The conditioning-flotation tests of coal fly ash were conducted using different conditioning speeds. The results showed that the removal of unburned carbon was greatly improved due to the strengthened turbulence in the stirred tank, and the optimal results were obtained with an LOI of 3.32%, a yield of 78.69% and an RUC of 80.89% when the conditioning speed was 1200 rpm.</abstract><cop>Basel</cop><pub>MDPI AG</pub><doi>10.3390/min8120597</doi><oa>free_for_read</oa></addata></record> |
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| ispartof | Minerals (Basel), 2018-12, Vol.8 (12), p.597 |
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| source | MDPI - Multidisciplinary Digital Publishing Institute; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; Alma/SFX Local Collection |
| subjects | Carbon Coal Computational fluid dynamics Computer applications Deformation Eddy viscosity Education Efficiency Energy Energy dissipation Energy exchange Flotation Flotation reagents Fluid dynamics Fluid flow Fluid mechanics Fly ash Higher education institutions Investigations Kinematic viscosity Kinematics Kinetic energy Mixing length Natural sciences Navier-Stokes equations Numerical analysis Preconditioning Reagents Reynolds number Simulation Surfactants Tensors Turbines Turbulent flow Viscosity Vortices |
| title | The Process of the Intensification of Coal Fly Ash Flotation Using a Stirred Tank |
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