剪切环境下某铅锌尾矿絮团演化过程及絮团表征  

Floc Evolution and Characterization of Lead-zinc Tailing in Shearing Environment

作　　者：孙浩 李茂林[1,2,3] 崔瑞[1,2] 江宏强[1,2] 周胜 宁江峰 SUN Hao;LI Maolin;CUI Rui;JIANG Hongqiang;ZHOU Sheng;NING Jiangfeng(College of Resources and Environmental Engineering, Wuhan University of Science and Technology, Wuhan 430081, China;Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgic Mineral Resources, Wuhan 430081, China;Changsha Research Institute of Mining and Metallurgy Limited Liability Company, Changsha 410012, China)

机构地区：[1]武汉科技大学资源与环境工程学院,湖北武汉430081 [2]冶金矿产资源高效利用与造块湖北省重点实验室,湖北武汉430081 [3]长沙矿冶研究院有限责任公司,湖南长沙410012

出　　处：《矿产保护与利用》2020年第4期75-81,共7页Conservation and Utilization of Mineral Resources

基　　金：武汉科技大学大学生科技创新计划资助项目(18ZRA214)。

摘　　要：某铅锌矿山对尾矿颗粒絮团强度有一定要求,为了研究如何表征并增大絮团强度,考察了絮凝剂的种类和用量、搅拌时间、搅拌速度以及单位矿浆输入能量等剪切环境因素对某铅锌尾矿剪切絮凝沉降的影响,进行了相应的絮凝沉降试验、颗粒录影显微技术(ParticleView V19)实时监测以及显微镜絮团图像分析,并讨论了絮凝机理,旨在揭示絮体形成过程与絮凝效果的关系。结果表明:对某铅锌尾矿的絮凝作用:阳离子聚丙烯酰胺>阴离子聚丙烯酰胺>阳离子醚化淀粉,阳离子聚丙烯酰胺(CPAM)最佳用量值为200 g/t,加入表面电荷相反的PAM,能使颗粒表面动电位降低而凝聚,当絮凝剂过量时,会使得整个体系变为带正电荷。由于正电荷间的互斥作用,絮凝体再次分散,发生再稳现象,从而使絮凝效果减弱。搅拌时间、搅拌速度、单位矿浆输入能量对某铅锌尾矿的剪切絮凝行为的影响很大;搅拌时间关系着絮团的成长破碎程度;搅拌强度的大小影响着絮团所受剪切强度,搅拌强度越大,絮团最终形成稳态的抗剪切强度越高,形貌越规则;单位矿浆输入能量存在一个极限值,超过极限值时,絮团形成与破碎达到了一个相对平衡的稳态,絮团能够在此搅拌体系下稳定存在。A lead-zinc mine has certain requirements for the strength of the tailings particle floc.In order to study how to characterize and increase the floc strength,the shearing environmental factors such as the type and dosage of flocculant,stirring time,stirring speed,and input energy per pulp were investigated.The effect on the shear flocculation sedimentation of a lead-zinc tailing was tested by corresponding flocculation sedimentation test,particle video microscopy(ParticleView V19)real-time monitoring and microscopic floc image analysis.And the flocculation mechanism was discussed in order to reveal flocs relationship between formation process and flocculation effect.The results showed that the flocculation effect of flocculant on the lead-zinc tailings from strong to weak was as follows:cationic polyacrylamide>anionic polyacrylamide>cationic etherified starch.The optimal dosage of cationic polyacrylamide(CPAM)was 200 g/t.PAM could reduce the kinetic potential of the particle surface and agglomerate.When the flocculant dosage was excessive,the entire system became positively charged.Due to the mutual repulsion between the positive charges,the floes were dispersed again,and the re-stabilization phenomenon was occurred,which could weaken the flocculation effect.Stirring time,stirring speed,and unit pulp input energy had a great influence on the shear flocculation behavior of the lead-zinc tailing.The stirring time was related to the growth and fragmentation of the floc.The stirring intensity was related to the shear strength of the floc.The greater the stirring intensity,the higher the flocculation final stable shear strength and the more regular the morphology were.There was a limit value for the unit pulp input energy.When the limit value was exceeded,the floc formation and fragmentation reached a relatively balanced steady state,and the floc could exist stably under this stirring system.

关 键 词：剪切环境 絮凝 絮团表征 絮团强度 

分 类 号：TD921.4[矿业工程—选矿]