全尾砂膏体颗粒动力学及其影响因素

杨柳华; 贾恒伟; 吴爱祥; 焦华喆; 陈新明; 寇云鹏; 董萌萌

doi:10.1007/s12613-023-2804-5

Volume 31 Issue 9

Sep. 2024

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文章导航 > 矿物冶金与材料学报（英文） > 2024 > 31(9): 1965-1974

Liuhua Yang, Hengwei Jia, Aixiang Wu, Huazhe Jiao, Xinming Chen, Yunpeng Kou, and Mengmeng Dong, Particle aggregation and breakage kinetics in cemented paste backfill, Int. J. Miner. Metall. Mater., 31(2024), No. 9, pp. 1965-1974. https://doi.org/10.1007/s12613-023-2804-5

Cite this article as:

Liuhua Yang, Hengwei Jia, Aixiang Wu, Huazhe Jiao, Xinming Chen, Yunpeng Kou, and Mengmeng Dong, Particle aggregation and breakage kinetics in cemented paste backfill, Int. J. Miner. Metall. Mater., 31(2024), No. 9, pp. 1965-1974. https://doi.org/10.1007/s12613-023-2804-5

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研究论文

全尾砂膏体颗粒动力学及其影响因素

1)
河南理工大学土木工程学院, 河南焦作454000
2)
北京科技大学土木与环境工程学院, 北京100083

通讯作者:
杨柳华 E-mail: yanglh2005@163.com

文章亮点

(1) 系统地研究了质量分数、灰砂比、外加剂及剪切扰动对膏体颗粒动力学的影响；

(2) 引入聚集常数及分散常数构建了膏体颗粒动力学理论模型；

(3) 揭示了膏体内部细观结构时空演变机制。

中文摘要

膏体宏观流动和流变特性受到其细观结构的影响。本文通过应用聚焦光束反射测量技术(FBRM)，对不同条件下絮团（团聚体/颗粒）的粒径变化和分布进行监测，并对絮团聚集和破碎动力学影响因素进行了讨论。结果表明，膏体动力学演化受到内部因素及外部因素的协同作用影响，可分为动态阶段和稳定阶段。提高质量浓度或增大灰砂比都能增大膏体聚集常数，有助于絮团平均弦长增大；而外加剂及扰动增大了分散常数，促使絮团平均弦长减小。弦长分布曲线峰值在20 μm左右，近似正态分布。聚集系数（k₂）与扰动速率成正相关，且分散常数（k₁）比聚集常数（k₂）值高出近5个数量级。动力学模型定量描述了颗粒随时间的演化规律，为研究膏体复杂流变行为的微观机制提供理论支撑。

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Research Article

Particle aggregation and breakage kinetics in cemented paste backfill

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Abstract

Abstract

The macroscopic flow behavior and rheological properties of cemented paste backfill (CPB) are highly impacted by the inherent structure of the paste matrix. In this study, the effects of shear-induced forces and proportioning parameters on the microstructure of fresh CPB were studied. The size evolution and distribution of floc/agglomerate/particles of paste were monitored by focused beam reflection measuring (FBRM) technique, and the influencing factors of aggregation and breakage kinetics of CPB were discussed. The results indicate that influenced by both internal and external factors, the paste kinetics evolution covers the dynamic phase and the stable phase. Increasing the mass content or the cement–tailings ratio can accelerate aggregation kinetics, which is advantageous for the rise of average floc size. Besides, the admixture and high shear can improve breaking kinetics, which is beneficial to reduce the average floc size. The chord length resembles a normal distribution somewhat, with a peak value of approximate 20 μm. The particle disaggregation constant (k₂) is positively correlated with the agitation rate, and k₂ is five orders of magnitude greater than the particle aggregation constant (k₁). The kinetics model depicts the evolution law of particles over time quantitatively and provides a theoretical foundation for the micromechanics of complicated rheological behavior of paste.
- cemented paste backfill;
- particle kinetics;
- admixture;
- rheology

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