The flocculation and settlement behavior of full tailings particle groups in the deep cone thickener feedwell is the key link of solid-liquid separation.In order to explore the flow field characteristics inside the feedwell and improve the deep dewatering performance of tailings,a visualization test system for the flow field characteristics inside the feed well of a deep cone thickener was designed based on the acrylic similarity model of the feedwell,particle imaging velocity measurement technology,and floc tracking technology.The flow fields of full tailings particle groups under the in-situ flocculation system of the feedwell with different feeding flow rates were visualized and studied.The results show that with the increase of feeding flow,the relative retention rate and turbulent kinetic energy decay rate gradually increase and tend to be stable,indicating that there is a limit optimal value of feeding flow.When the feeding flow rate is too small,the initial kinetic energy of the feed is insufficient,the full tailings can not fully spiral movement in the feedwell,and the flocculation effect is poor.When the feeding flow rate is too high,the turbulent kinetic energy at the outlet of the feedwell is still large,which destroys the completed flocculation particle group,and the flocculation effect is poor.
关键词
膏体充填/深锥浓密机/给料井/流场特性/絮凝沉降/粒子成像测速
Key words
Paste filling/Deep cone thickener/Feedwell/Flow field characteristics/Flocculation and settlement/Particle imaging velocimetry
维普
万方数据