High shear granulation of clay: Effect of experimental variables

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology Pub Date : 2025-04-28 DOI:10.1016/j.powtec.2025.121082

Maurizio Vespignani , Ilaria Zanoni , Lara Faccani , Simona Ortelli , Magda Blosi , Andreana Piancastelli , Cesare Melandri , Irini Furxhi , Anna Luisa Costa

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Abstract

This study investigates the influence of high-shear mechanical granulation parameters on the properties and distribution of a clay-based granulated powder population. The granulation parameters examined as design variables include granulation time, impeller speed, liquid addition rate, rotation mode, and binder agent incorporation. Our findings reveal significant behavioral differences across all parameters when comparing hydrophilic bentonite clays to hydrophobic synthetic hydrotalcite. For hydrophilic clays, the liquid-to-solid ratio is identified as the most critical variable, whereas it exerts minimal impact on hydrophobic hydrotalcite. This suggests the presence of a delicate balance between growth and breakage mechanisms in hydrophobic powders, involving the formation of water droplets that encapsulate particles, aligned with an increased swelling ratio. Furthermore, the addition of an acrylic binder to the bentonite mixture enhances open porosity without affecting compressive strength. These results highlight the need for tailored process modifications in the design of granulated clay-based advanced materials.

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粘土高剪切造粒：实验变量的影响

本文研究了高剪切机械造粒参数对粘土基造粒粉体性质和分布的影响。作为设计变量的造粒参数包括造粒时间、叶轮转速、液体添加速度、旋转方式和粘结剂掺入。我们的研究结果表明，当比较亲水膨润土和疏水合成水滑石时，所有参数的行为都有显著差异。对于亲水粘土，液固比被认为是最关键的变量，而对疏水滑石的影响最小。这表明在疏水粉末的生长和破裂机制之间存在微妙的平衡，包括包裹颗粒的水滴的形成，与增加的膨胀率相一致。此外，在膨润土混合物中加入丙烯酸粘合剂可以在不影响抗压强度的情况下提高孔隙率。这些结果强调了在粒状粘土基先进材料的设计中需要量身定制的工艺修改。

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.