Experimental Study on the Sedimentation of Silicon Particles Under the Interference of Flocculants

IF 3.3 3区材料科学 Q3 CHEMISTRY, PHYSICAL

Silicon Pub Date : 2025-07-15 DOI:10.1007/s12633-025-03380-x

Yang Yang, Shicong Yang, Keqiang Xie, Kuixian Wei, Wenhui Ma

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引用次数: 0

Abstract

Silicon separation from diamond wire saw waste slurry is the primary step for silicon resource recovery, yet the relatively low recovery rate in current processes indicates inadequate separation efficiency. This study focuses on the sedimentation behavior of particle groups and investigates the interference sedimentation mechanism under the action of flocculants. Experimental results show that CPAM (Cationic Polyacrylamide) is the optimal flocculant for promoting interference sedimentation. For 3.72 μm silicon particles, the best effect is achieved with a CPAM concentration of 0.2% and a dosage of 0.34 g/L, while 0.59 μm silicon particles require a higher CPAM concentration of 0.4% and a dosage of 0.68 g/L due to their larger specific surface area and more surface voids, which demand more flocculant. The addition of PDDA(Polydiallyldimethylammonium chloride) can reduce the contact angle between particles and CPAM, improve the overall hydrophilicity of the suspension, and enhance flocculation efficiency. Specifically, 2.35 g/L PDDA is suitable for 3.72 μm particles, and 7.05 g/L PDDA is needed for 0.59 μm particles. This study reveals the influence of flocculant concentration and particle size on sedimentation, providing a theoretical basis for enhancing solid–liquid separation in silicon waste slurry recovery.

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絮凝剂干扰下硅颗粒沉降的实验研究

金刚石线锯废浆中硅的分离是硅资源回收的首要步骤，但目前工艺中硅的回收率较低，表明分离效率不高。研究了絮凝剂作用下颗粒群的沉降行为，探讨了絮凝剂作用下的干涉沉降机理。实验结果表明，CPAM（阳离子聚丙烯酰胺）是促进干涉沉降的最佳絮凝剂。对于3.72 μm硅颗粒，当CPAM浓度为0.2%、用量为0.34 g/L时效果最好，而0.59 μm硅颗粒由于比表面积较大、表面空隙较多，需要较多的絮凝剂，所以CPAM浓度为0.4%、用量为0.68 g/L时效果最好。PDDA（聚二烯基二甲基氯化铵）的加入可以减小颗粒与CPAM的接触角，提高悬浮液的整体亲水性，提高絮凝效率。对于3.72 μm的粒子，PDDA为2.35 g/L；对于0.59 μm的粒子，PDDA为7.05 g/L。本研究揭示了絮凝剂浓度和粒径对沉降的影响，为硅废浆回收中加强固液分离提供了理论依据。

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来源期刊

Silicon CHEMISTRY, PHYSICAL-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

5.90

自引率

20.60%

发文量

685

审稿时长

>12 weeks

期刊介绍： The journal Silicon is intended to serve all those involved in studying the role of silicon as an enabling element in materials science. There are no restrictions on disciplinary boundaries provided the focus is on silicon-based materials or adds significantly to the understanding of such materials. Accordingly, such contributions are welcome in the areas of inorganic and organic chemistry, physics, biology, engineering, nanoscience, environmental science, electronics and optoelectronics, and modeling and theory. Relevant silicon-based materials include, but are not limited to, semiconductors, polymers, composites, ceramics, glasses, coatings, resins, composites, small molecules, and thin films.