(1. 華北理工大學(xué) 礦業(yè)工程學(xué)院，唐山 063200；
2. 河南理工大學(xué) 土木工程學(xué)院，焦作 454000)
摘 要: 為了探明全尾砂漿深錐濃密過程中絮團(tuán)的動(dòng)態(tài)沉降規(guī)律，自制連續(xù)濃密實(shí)驗(yàn)平臺(tái)開展動(dòng)態(tài)絮凝沉降實(shí)驗(yàn)，基于互相關(guān)原理和顆粒追蹤軟件進(jìn)行數(shù)據(jù)處理，分析入料速度、耙架攪拌速度及料漿質(zhì)量分?jǐn)?shù)對絮團(tuán)沉降行為的影響。結(jié)果表明：絮團(tuán)在豎直方向上受到沉降柱內(nèi)水體紊動(dòng)和底部水流回流公共作用導(dǎo)致沉降速度呈逐漸降低的趨勢；入料速度、耙架攪拌與水體紊動(dòng)剪切作用呈正相關(guān)，紊動(dòng)剪切作用較弱時(shí)，促進(jìn)絮團(tuán)顆粒的凝結(jié)，提高絮團(tuán)沉降速率。反之，則會(huì)破壞絮團(tuán)結(jié)構(gòu)，抑制絮團(tuán)沉降過程；底部絮團(tuán)沉降速度與料漿質(zhì)量分?jǐn)?shù)呈負(fù)相關(guān)；保持剪切強(qiáng)度在峰值區(qū)有利于絮團(tuán)的快速沉降，本實(shí)驗(yàn)條件下建議耙架攪拌速度為0.2~0.6 r/min、入料速度為0.2~0.3 m/s。
關(guān)鍵字: 全尾砂；動(dòng)態(tài)絮凝沉降；顆粒追蹤；紊動(dòng)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
