粗颗粒流态化浮选Ⅰ:动力学分区及矿化气絮体稳定性分析  

Coarse particle fluidized bed flotationⅠ:Kinetic zoning and mineralized aggregates stability analysis

作　　者：刘金成 何琦 尹青临 李世祥 张怡晴 丁世豪 徐梦迪[1,2] 邢耀文[1,2] 桂夏辉[1,2] LIU Jincheng;HE Qi;YIN Qinglin;LI Shixiang;ZHANG Yiqing;DING Shihao;XU Mengdi;XING Yaowen;GUI Xiahui(State Key Laboratory of Coking Coal Resources Green Exploitation,China University of Mining and Technology,Xuzhou 221116,China;National Engineering Research Center of Coal Preparation and Purification,China University of Mining and Technology,Xuzhou 221116,China;School of Chemical Engineering&Technology,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]中国矿业大学炼焦煤资源绿色开发全国重点实验室,徐州221116 [2]中国矿业大学国家煤加工与洁净化工程技术研究中心,徐州221116 [3]中国矿业大学化工学院,徐州221116

出　　处：《中国有色金属学报》2024年第11期3792-3801,共10页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(52274278,52174265)。

摘　　要：流态化浮选技术作为粗颗粒分选新技术,明晰其动力学分选过程、揭示粗颗粒回收强化机理可为调控粗颗粒流态化分选过程奠定理论基础。本文搭建了实验室粗颗粒流态化浮选试验系统,采用电阻层析成像(ERT)、高速摄像、深槽取样等测试方法系统地探讨了不同上升水流速度(8 L/min、10 L/min和12 L/min)下床层轴向浓度分布。结果表明,流化玻璃球浓度在不同水流速度下均呈现自底部向顶部逐渐递减的稳定分布,中部浓度随高度增加而显著降低。进一步提出了粗颗粒流态化浮选“四分区”动力学模型,揭示了稀相区和浓相区的矿化分离机制:稀相区的分选过程为“浮力-重力”耦合,依赖于微重力场的泡沫浮选;浓相区为“重力-浮力”耦合,基于密度差异的重力分选。此外,建立了颗粒气泡矿化气絮体稳定性计算模型,推导了矿化气絮体稳定存在下的最大颗粒尺寸(R_(max)),从理论上证明了流态化浮选的粗颗粒浮选粒度上限是传统机械搅拌式浮选的1.5~1.8倍。The fluidized flotation technology is a new technology for coarse particle separation,the kinetic separation process and revealing the coarse particle recovery enhancement mechanism can lay a theoretical foundation for regulating the coarse particle fluidized separation process.A laboratory-scale fluidization flotation test system was established.Employing techniques,such as electrical resistance tomography(ERT),high-speed imaging,and deep slot sampling,the axial concentration distribution of the bed at different rising water velocities(8 L/min,10 L/min and 12 L/min)was systematically studied.The results show that the fluidized glass beads display a stable concentration profile,consistently declining distribution from the bottom to the top of the column,the mid-bed concentration significant decrease with the height increasing.Additionally,a“four-zone”kinetic process of coarse particle fluidization flotation was proposed,elucidating the mineralization separation mechanisms in both the dilute and dense phases.In the dilute phase,the separation process is marked by“Flotage-Gravity”coupling,which relies on froth flotation in a microgravity environment.In contrast,the dense phase operates through“Gravity-Flotation”coupling,which is driven by gravitational separation dictated by density differences.A model for calculating the stability of mineralized aggregates was established,allowing for the derivation of the maximum particle size(R_(max))under conditions of stable existence of mineralized aggregate,which theoretically proves that the upper limit of flotation particle size for fluidized flotation is 1.5-1.8 times greater than that of traditional mechanical agitation flotation.

关 键 词：粗颗粒 流态化浮选 动力学分区 电阻层析成像 气絮体稳定性模型 

分 类 号：TP94[自动化与计算机技术]