Fundamental insights into the effect of bubble size on the bubble-particle detachment

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology Pub Date : 2025-05-26 DOI:10.1016/j.powtec.2025.121166

Liang Zhao , Zhijun Zhang , Qingxia Liu

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引用次数: 0

Abstract

Bubble size plays a pivotal role in froth flotation. The effect of bubble size on bubble-particle collision and attachment has been well identified, but how it affects bubble-particle detachment is still unclear. In this study, the effect of bubble size on bubble-particle detachment was fundamentally investigated, with a special focus on force behavior. The theoretically calculated forces, based on the parameters obtained from the image process, showed good agreement with the measured forces by the bimorph. The interaction force between the bubble and particle was first increased and then decreased during the detachment process, which was attributed to the dynamic competition of the capillary force and Laplace pressure force. The maximum value of the interaction force was defined as the critical detachment force. It represents the minimum detachment force required to detach a particle from a bubble. The critical detachment force was increased with bubble size, which suggested that the detachment between a particle and a larger bubble was more difficult. This was further confirmed by the study of detachment probability. It was found that the detachment probability of the bubble-particle aggregate with a smaller bubble size was higher than that with a larger bubble size.

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气泡大小对气泡颗粒分离影响的基本见解

泡沫粒度在浮选过程中起着举足轻重的作用。气泡大小对气泡-颗粒碰撞和附着的影响已经被很好地确定，但它是如何影响气泡-颗粒分离的还不清楚。在这项研究中，从根本上研究了气泡大小对气泡颗粒分离的影响，特别关注了力行为。根据图像处理得到的参数，理论计算得到的力与双晶片测得的力吻合较好。在分离过程中，气泡与颗粒之间的相互作用力先增大后减小，这主要归因于毛细管力与拉普拉斯压力力的动态竞争。将相互作用力的最大值定义为临界分离力。它表示将粒子从气泡中分离出来所需的最小分离力。临界分离力随气泡尺寸的增大而增大，表明颗粒与较大气泡之间的分离难度增大。剥离概率的研究进一步证实了这一点。结果表明，气泡尺寸越小，气泡颗粒聚集体的分离概率越高。

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.