Hard/stiff surface coatings for weakening rock particles – Part III: Numerical validation

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology Pub Date : 2025-05-02 DOI:10.1016/j.powtec.2025.121085

Mahmut Camalan

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Abstract

The size reduction process is an energy-inefficient process for mineral processing, which needs to be remedied. This study uses the Discrete Element Method (DEM) to assess if hard surface coatings on rock particles can weaken them. For that purpose, surface-coated and uncoated particles were generated on the same particle geometry. Then, the impact breakage of both particles was simulated when particles collided with a wall. The simulation results strongly support the hypothesis that strong and/or stiff surface coatings weaken the particles, resulting in higher damage at impact. On the other hand, soft surface coatings are likely to retard the impact breakage of particles. The coated particle that is to be weakened should be relatively strong/stiff so that the generated fragments become finer. High coverage of strong/stiff coatings may be essential if flaky/rectangular particles are to be weakened. There appears to be a limit for the strength/stiffness of the surface coating, above which the particle damage cannot increase further. Introducing a strong or stiff surface coating may even be sufficient to increase particle damage. The simulation results also infer the alternative use of strong and/or stiff surface coatings as grinding aids.

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弱化岩石颗粒用硬/硬表面涂层。第III部分：数值验证

在选矿过程中，粒度还原工艺是一种能源效率低下的工艺，需要加以改进。本研究使用离散元法（DEM）来评估岩石颗粒的硬表面涂层是否会削弱它们。为此，在相同的粒子几何结构上生成了表面涂覆和未涂覆的粒子。然后，模拟了两种颗粒与壁面碰撞时的冲击破碎。模拟结果有力地支持了一个假设，即强和/或硬的表面涂层会削弱颗粒，从而导致更高的撞击损伤。另一方面，柔软的表面涂层有可能延缓颗粒的冲击破碎。要被削弱的涂层颗粒应该相对较强/坚硬，以便生成的碎片变得更细。如果要削弱片状/矩形颗粒，高覆盖的强/硬涂层可能是必不可少的。表面涂层的强度/刚度似乎有一个极限，超过这个极限，颗粒损伤就不能进一步增加。引入坚固或坚硬的表面涂层甚至可能足以增加颗粒损伤。模拟结果还推断了强和/或硬表面涂层作为磨削辅助剂的替代使用。

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.