射流与搅拌协同式浮选机气体引射规律探究  

Study on the Law of Gas Injection of the Combined Jet and Agitation Flotation Machine

作　　者：周伟[1,2] 王涛 王淑杰[1] 汪玲玲 李亮 王辉 ZHOU Weil;WANG Tao;WANG Shujie;WANG Lingling;LI Liang;WANG Hui(College of Materials Science and Engineering,Anhui University of Science and Technology,Huainan 232001,Anhui,China;State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines,Huainan 232001,Anhui,China)

机构地区：[1]安徽理工大学材料科学与工程学院,安徽淮南232001 [2]深部煤矿采动响应与灾害防控国家重点实验室,安徽淮南232001

出　　处：《有色金属（选矿部分）》2024年第8期122-130,共9页Nonferrous Metals（Mineral Processing Section）

基　　金：安徽省教育厅高校科学科研项目(KJ2021A0429);安徽省教育厅高校优秀拔尖人才培育资助项目(gxyqZD2021109);深部煤矿采动响应与灾害防控国家重点实验室开放基金资助项目(SKLMRDPC19KF11);安徽省高效协同创新项目(GXXT-2022-016);安徽省自然科学基金资助项目(2108085ME160)。

摘　　要：为了探究射流与搅拌协同式浮选装置在射流与搅拌协同作用下的气体引射规律,建立了射流与搅拌耦合区域模型,分别模拟了射流速度变化、搅拌速度变化、射流速度与搅拌速度同时变化对装置吸气能力的影响,搭建了射流与搅拌协同式浮选装置并对其进行试验。结果表明,射流速度是影响装置吸气能力的主要影响因素,搅拌速度对装置吸气能力产生一定的影响;射流与搅拌协同作用下浮选装置的吸气能力取决于射流速度与搅拌速度的相对贡献;射流速度与搅拌速度的增大对喷嘴的吸气能力分别产生促进与抑制的效果;当射流速度带来的增益效果大于搅拌速度带来的抑制效果时,提高装置吸气量的同时也促进了物料的混合,反之则降低装置的吸气量;随着搅拌速度的不断增加,叶轮剪切射流束的剪切力与剪切面积逐渐减小,射流束不再冲击叶轮,此时装置的吸气能力取决于射流速度大小。射流与搅拌协同式浮选装置在流量8.2m^(3)/h以上工作时,搅拌速度对喷嘴吸气能力影响较小;当在流量8.4m^(3)/h、转速7.5m/s的条件下工作时,此时喷嘴的吸气能力得到质的提高并且物料混合效果较好,浮选装置具有较好的工作能力;当搅拌速度达到8.75r/s以上时,射流束逐渐发生轨迹偏移,装置吸气能力取决于射流速度且射流束不再冲击驱动叶轮。In order to investigate the gas entrainment characteristics of the jet and agitation synergistic flotation device under the synergistic effect of jet and agitation,a coupled zone model of jet and agitation was established.The impact of jet velocity variation,agitation velocity variation,and simultaneous variation of jet velocity and agitation velocity on the gas entrainment capacity of the device was simulated.A jet and agitation synergistic flotation device was constructed and experimentally explored.The results showed that the jet velocity was the main influencing factor on the gas entrainment capacity of the device,while the agitation velocity had a certain impact.The gas entrainment capacity of the flotation device under the synergistic effect of jet and agitation depended on the relative contribution of jet velocity and agitation velocity.Increasing jet velocity and agitation velocity had promoting and inhibiting effects on the gas entrainment capacity of the nozzle respectively.When the gain effect brought about by jet velocity was greater than the inhibitory effect brought about by agitation velocity,increasing the gas entrainment capacity of the device also promoted material mixing,otherwise,it reduced the gas entrainment capacity of the device.With the continuous increase of agitation velocity,the shear force and shear area of the impeller shearing jet stream gradually decreased,and the jet stream no longer impacted the impeller.At this time,the gas entrainment capacity of the device depended on the magnitude of the jet velocity.When the jet and agitation synergistic flotation device operated at a flow rate above 8.2 m^(3)/h,the agitation velocity had less influence on the nozzle gas entrainment capacity.When operating at a flow rate of 8.4 m^(3)/h and a speed of 7.5 m/s,the gas entrainment capacity of the nozzle was qualitatively improved and the material mixing effect was good,indicating that the flotation device had good operational capability.When the agitation velocity reached 8.75 r/s or higher,the

关 键 词：气体引射规律 射流与搅拌协同作用 浮选装置 

分 类 号：TD456[矿业工程—矿山机电]