【作者】 程敢；

【导师】 刘炯天； 马力强；

【作者基本信息】 中国矿业大学（北京） ， 矿物加工工程， 2014， 博士

【摘要】 旋流-静态微泡浮选柱在煤炭、矿物分选及油水处理等领域得到了广泛应用。但随着工业化程度的日益加深,对该柱式分选过程中不同流态所适配物性特征的研究有待进一步加强。基于此,论文将浮选柱中集成的三种流态单独进行研究,设计了分别以逆流、旋流、管流为主要矿化方式的浮选柱,利用湍流动能以及湍流耗散率衡量浮选过程内部能量状态。建立了以高速摄像仪为核心的气泡观察系统,研究了湍流耗散率对气泡尺寸的影响。利用EDLVO理论分析了颗粒-气泡相互作用总势能与作用距离之间的关系,浮选动力学理论计算了颗粒-气泡间的碰撞、粘附、脱附及捕获概率。结果表明,随着煤泥的可浮性逐渐变差,其单位可燃体回收所消耗的能量逐渐增多。同时,揭示了与不同流场环境相适配的物性特征。三种矿化方式对相同粒级的回收能力比较,逆流、旋流、管流分别对粗粒级、中间粒级和细粒级的回收能力较强。更多还原

【Abstract】 The Cyclone-Static Microbubble Flotation Column (FCSMC) is widely used in coal, mineral separation, oily wastewater treatment and other fields. However, with the deepening of industrialization, the study on physical characteristics suitable for multi-flow column separation process needs to be strengthened further. For this, the three flow regimes integrated in the FCSMC were studied, respectively. Meanwhile, the three corresponding flotation processes were established. The internal energy feature of flotation process was evaluated by turbulent kinetic energy and turbulent dissipation rate. The bubble viewer with the high-speed camera as the core was set up, and the effect of turbulent dissipation rate on bubble size was stuided. By the EDLVO theory, the relationship between the total interaction potential energy and operating range was analysed. Based on flotation kinetic theory, the probabilities of collision, attachment, detachment and acquisition between particle and bubble were also calculated. The results showed that with the flotability gradually becoming worse, the energy required by per combustible product increased. The coal properties suitable for different flow fields were revealed. Comparising the recovery capacities of the three mineralization ways on the same particle size, the recycling capacities of countercurrent, cyclone and pipe flow were stronger on coarse, intermediate and fine particles, respectively.更多还原