(1. 华北理工大学 矿业工程学院，唐山 063200；
2. 河南理工大学 土木工程学院，焦作 454000)
摘 要: 为了探明全尾砂浆深锥浓密过程中絮团的动态沉降规律，自制连续浓密实验平台开展动态絮凝沉降实验，基于互相关原理和颗粒追踪软件进行数据处理，分析入料速度、耙架搅拌速度及料浆质量分数对絮团沉降行为的影响。结果表明：絮团在竖直方向上受到沉降柱内水体紊动和底部水流回流公共作用导致沉降速度呈逐渐降低的趋势；入料速度、耙架搅拌与水体紊动剪切作用呈正相关，紊动剪切作用较弱时，促进絮团颗粒的凝结，提高絮团沉降速率。反之，则会破坏絮团结构，抑制絮团沉降过程；底部絮团沉降速度与料浆质量分数呈负相关；保持剪切强度在峰值区有利于絮团的快速沉降，本实验条件下建议耙架搅拌速度为0.2~0.6 r/min、入料速度为0.2~0.3 m/s。
关键字: 全尾砂；动态絮凝沉降；颗粒追踪；紊动剪切
（1. School of Mining Engineering, North China University of Science and Technology, Tangshan 063200, China;
2. School of Civil Engineering, Henan Polytechnic University, Jiaozuo 454000, China）
Abstract:In order to explore the dynamic settlement behavior of flocs in the deep cone thickening process of unclassified tailings slurries, dynamic flocculation sedimentation experiments were carried out based on a self-made apparatus. And the effects of inlet speed, harrow rake stirring speed and mass fraction of slurry on flocculation settlement behavior were analyzed by the cross-correlation theory. The results indicate that the settlement velocity of flocs decreases gradually in the vertical direction, which is caused by the flow turbulence and backflow at bottom. Both inlet speed and harrow rake stirring are positively correlated with the turbulent shear force. When the turbulent shearing is low, the flocculation sedimentation rate increases. On the contrary, the floc structure is destroyed and the flocculation sedimentation is suppressed. The settlement velocity of bottom flocs is negatively correlated with mass fraction of slurry. The shear strength at peak area is beneficial to the settlement of flocs. It is recommended that the mixing speed of rake rack is 0.2-0.6 r/min and the inlet speed is 0.2-0.3 m/s.
Key words: unclassified tailings; dynamic flocculation sedimentation; particle tracking; turbulent shear rate
