Effect of aeration rate on fluidization characteristics and separation of fluidized bed flotation: Experiment and numerical simulation

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology Pub Date : 2025-05-26 DOI:10.1016/j.powtec.2025.121170

Qinglin Yin , Shasha Wang , Shihao Ding , Qi He , Xiahui Gui , Yaowen Xing

引用次数: 0

Abstract

Fluidized bed flotation has demonstrated efficacy in the separation of coarse minerals. The effects of aeration rate on the fluidization characteristics, including bubble parameters, phase distribution and turbulent eddy dissipation, were investigated by experiment and numerical simulation. The numerical simulation results are highly consistent with the experiment. Secondly, the effect of fluidization characteristics on the recovery of quartz beads was analyzed. As the aeration rate increases, bubble size and velocity increase, particle-bubble distribution becomes more nonuniform, resulting in sharp pressure fluctuations. Furthermore, the increase of water velocity gradient leads to an increase of turbulent eddy dissipation. All of these have adverse effects on the recovery of hydrophobic quartz beads, resulting in an initial increase followed by a decrease trend. When the aeration rate is 1.0 L/min, the optimal recovery is 67.05 %.

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曝气率对流化床浮选流化特性及分离的影响：实验与数值模拟

流化床浮选在粗粒矿物的分离中已被证明是有效的。通过实验和数值模拟研究了曝气率对气泡参数、相分布和湍流涡旋耗散等流化特性的影响。数值模拟结果与实验结果高度吻合。其次，分析了流化特性对石英珠回收率的影响。随着曝气量的增大，气泡尺寸和速度的增大，颗粒-气泡分布变得更加不均匀，导致压力波动剧烈。此外，水流速度梯度的增大导致湍流涡耗散的增大。所有这些都对疏水石英珠的回收率产生不利影响，导致初始增加，然后下降趋势。当曝气速率为1.0 L/min时，最佳回收率为67.05%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Powder Technology 工程技术-工程：化工

CiteScore

9.90

自引率

15.40%

发文量

1047

审稿时长

46 days

期刊介绍： Powder Technology is an International Journal on the Science and Technology of Wet and Dry Particulate Systems. Powder Technology publishes papers on all aspects of the formation of particles and their characterisation and on the study of systems containing particulate solids. No limitation is imposed on the size of the particles, which may range from nanometre scale, as in pigments or aerosols, to that of mined or quarried materials. The following list of topics is not intended to be comprehensive, but rather to indicate typical subjects which fall within the scope of the journal's interests: Formation and synthesis of particles by precipitation and other methods. Modification of particles by agglomeration, coating, comminution and attrition. Characterisation of the size, shape, surface area, pore structure and strength of particles and agglomerates (including the origins and effects of inter particle forces). Packing, failure, flow and permeability of assemblies of particles. Particle-particle interactions and suspension rheology. Handling and processing operations such as slurry flow, fluidization, pneumatic conveying. Interactions between particles and their environment, including delivery of particulate products to the body. Applications of particle technology in production of pharmaceuticals, chemicals, foods, pigments, structural, and functional materials and in environmental and energy related matters. For materials-oriented contributions we are looking for articles revealing the effect of particle/powder characteristics (size, morphology and composition, in that order) on material performance or functionality and, ideally, comparison to any industrial standard.