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标准的浮选分离方法是要综合考虑浮选动力学和分选效率之间的关系,因为微细气泡和悬浮微粒一般具有较小的分离差异。已经研制了一种新的浮选系统来解决这些问题,它还具有其它方面的一些优点。这种新的技术是建立在名为Imhoflot充气式浮选机设计的基础上,Imhoflot浮选机是在矿浆进入浮选槽之前用在线方式对给入矿浆进行强烈预充气。因此,这种槽子只是用来分离矿粒,而不包括气泡与颗粒间的接触。在这个新的设备里,由于在分离容器内引入了离心运动,从而明显地加快了分离速度,这样就用不着内部运动部件了。这种设计的关键在于为易浮的矿化气泡和亲水微粒提供不同的作用力,这种作用力减少了泡沫中分散矿粒的机械夹带量,从而提高了精矿品位。这种设备对于工业应用的商业价值就在于大大地缩短了物料在设备中的滞留时间(少于30s),这样就可节省一大笔设备和基础设施费用。已经制造了槽子直径0.65、1.7和2.2m的样机,以进行流体力学和工业规模试验,用来评估先前制定的按比例放大的计算方法。在德国钾矿精选中,安装了直径1.7m的浮选槽,其生产能力为150m3/h,并获得了令人鼓舞的结果。在南非的一个洗煤厂中,安装了一个直径2.2m的G型浮选槽处理超细煤。将它与普通的充气式浮选机和机械搅拌式浮选机进行了对比。
The standard flotation separation method takes into account the relationship between flotation kinetics and separation efficiency, as microbubbles and aerosols generally have less separation differences. A new flotation system has been developed to solve these problems, and it has some other advantages. The new technology builds on the design of the Imhoflot inflatable flotation machine, where the Imhoflot flotation machine is used to pre-aerate the incoming slurry on-line before the slurry enters the flotation cell. Therefore, this tank is only used to separate the mineral particles, not including the contact between air bubbles and particles. In this new device, the speed of the separation is significantly increased due to the introduction of centrifugal motion in the separation vessel, thus eliminating the need for internal moving parts. The key to this design is to provide different forces to the easily floating mineralized gas bubbles and hydrophilic particles, which reduce the amount of mechanical entrainment of the dispersed particles in the foam, thereby increasing the concentrate grade. The commercial value of such equipment for industrial applications lies in the significant reduction of material retention time (less than 30 seconds) in the equipment, thus saving a significant amount of equipment and infrastructure costs. Prototypes with slot diameters of 0.65, 1.7, and 2.2 m have been fabricated for hydrodynamic and industrial scale trials to evaluate the previously scaled-up calculations. In the German potash selection, a 1.7m diameter flotation cell was installed with a production capacity of 150m3 / h and encouraging results were obtained. In a coal-washing plant in South Africa, a 2.2-meter-diameter G-type flotation cell was installed to process ultra-fine coal. It is compared with conventional aerated flotation machines and mechanically agitated flotation machines.