Effect of grinding methods on slime dissociation characteristics and flotation kinetics of coking coal

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL Powder Technology Pub Date : 2024-11-28 DOI:10.1016/j.powtec.2024.120508

Rui Gu , Chaoqun Li , Qifa Lu , Zheng Tong , Xiangyun Sun , Guangxi Ma , Xiangning Bu , Jie Sha , Guangyuan Xie , Ugur Ulusoy

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Abstract

Despite extensive research on the connection between coal flotation kinetics and particle size, little is known about the shape effect. To fill this gap, this study aims not only to explore dissociation characteristics and particle shape properties resulting from the grinding of coking coal in a planetary ball mill (PBM) and a vertical shaft impact crusher (VSIC) but also to investigate their effects on flotation kinetics. Moreover, for the first time in the literature, shape, kinetic rate constant, and bubble loading capacity (hydrophobicity) properties of coking coal products ground in two different mills were compared by shape characterization, flotation kinetics, and single bubble loading tests, respectively. The findings are: (1) Compared to PBM, VSIC produced rounder-shaped particles with a better communition selectivity, (2) Since PBM's flotation rate constant values (Km) were higher than VSIC's, the particles produced by the PBM exhibit a favorable aspect ratio for faster flotation.

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磨矿方式对炼焦煤煤泥解离特性及浮选动力学的影响

尽管对煤浮选动力学与粒度之间的关系进行了广泛的研究，但对形状效应的研究却很少。为了填补这一空白，本研究旨在探索在行星球磨机（PBM）和立轴冲击破碎机（VSIC）中研磨焦煤的解离特性和颗粒形状特性，并研究它们对浮选动力学的影响。此外，在文献中首次分别通过形状表征、浮选动力学和单泡加载试验，比较了两种不同磨机磨出的焦煤产品的形状、动力学速率常数和气泡加载能力（疏水性）特性。结果表明：(1)与PBM相比，VSIC产生的颗粒形状更圆，具有更好的通信选择性；(2)由于PBM的浮选速率常数（Km）高于VSIC， PBM产生的颗粒具有有利的长径比，有利于更快的浮选。

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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.