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新型三段式粗颗粒浮选柱内流场数值模拟

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本文对一种新型三段式粗颗粒浮选柱内流场特性进行了研究,结果表明,稳流板的加入可增强粗颗粒浮选柱内流体的湍动能和湍流耗散率,促进气泡和粗颗粒的相互作用以及湍动能、湍流耗散率和液相速度的均匀分布,从而利于矿化气泡的输送.射流管个数的增加使粗颗粒浮选柱内湍动能和湍流耗散率分布趋向于均匀.对称的4个射流管可显著改善流场分布,形成的漩涡促进了气泡与颗粒的相互作用,稳流板使气泡速度分布均匀.浮选柱内湍动能随着上升水量和充气量的增加而增大,稳流板作用明显.上升水量对稳流板上下方区域湍流耗散率的影响呈梯级分布,可实现底部紊流矿化、中部紊流-稳流转变、上部静态流态化浮选的三段式流体环境,利于粗颗粒矿物浮选的回收.
Numerical simulation of flow field in a new three-stage coarse particle flotation column
In this paper,the flow field characteristics inside a new three-stage coarse particle flotation column were investigated.The investigation results show that the addition of flow stabilizing plate can enhance the turbulent kinetic energy and turbulent dissipation rate of the fluid in the coarse particle flotation column,promote the interaction between bubbles and coarse particles and the uniform distribution of turbulent kinetic energy,turbulent dissipation rate and liquid phase velocity,thus facilitating the transport of mineralized bubbles.The increase of the jet tube number makes the distribution of turbulent kinetic energy and turbulent dissipation rate in the coarse particle flotation column tend to be uniform.The symmetrical four jet tubes can significantly improve the distribution of the flow field,the vortex formed promotes the interaction between the bubbles and particles,and the stabilizer plate makes the bubble velocity distribution uniform.The turbulence energy in the flotation column increases with the increase of rising water volume and inflation volume,and the effect of the flow stabilizer plate is obvious.The influence of the rising water volume on the turbulent dissipation rate in the area above and below the flow stabilizer plate has a graded distribution,which can realize the three-stage fluid environment of turbulent mineralization at the bottom,turbulence-steady flow transition in the middle,and static fluidization flotation in the upper part,which is conducive to the recovery of coarse-grained minerals by flotation.

flotation columnflow field characteristicsturbulent kinetic energyturbulent dissipation ratecomputational fluid dynamics

彭建、孙伟、沈政昌、韩海生、晋应升、肖遥、高志勇、孙磊、罗远家

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中南大学 资源加工与生物工程学院,长沙 410083

北京矿冶科技集团有限公司 矿物加工科学与技术国家重点实验室,北京 102628

浮选柱 流场特性 湍动能 湍流耗散率 计算流体动力学

国家重点研发计划国家重点研发计划云南省科技重大专项Major Science and Technology Program of Yunnan Province,China

2023YFC39042022022YFC2904500202202AB080012

2024

10.11817/j.ysxb.1004.0609.2023-44708

中国有色金属学报
中国有色金属学会

中国有色金属学报

CSTPCD北大核心
影响因子：1.108
ISSN：1004-0609
年,卷(期)：2024.34(8)
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