Numerical Analysis Of The Interior Flow In Mechanical And Pneumatic Floatation

Large-scale mechanical and pneumatic flotation machine is used widely in the mineral process for its higher handling capacity and lower unit power loss. The design methods of large-scale flotation machine still stays at the stage of structure-similitude design methods which usually refer to the small-scale floatation machine structure. The effective design method based on hydrodynamics similitude has not come into being. The flotation processes involves many physical processes. However pulp-bubbles-flotation reagent multiphase turbulent flow is the basic processes. The gas-solid-liquid three-phase fluid dynamics characters determine the flotation dynamics performance of flotation machine.The relationships between operation parameters, fluid dynamics parameters and flotation dynamics parameters are been explored in order to provide some references for the optimization design and operation of mechanical and pneumatic flotation machine,as follows:1. The effect of froth zone on the flow fields of flotation is omitted according to analysis of structure characters and flow field characters. The flow field is simplified and divided into three zones as mixture zone, transportation zone, and separation zone.2. The influent factor of the flotation reagent is omitted for the flow model simplification. The Mixture multiphase flow model and RNG k-εturbulent mode are used to simulate the flow fields in the flotation.3. Based on the model, numerical simulation on gas-solid-liquid three-phase flow in the JFC-150 flotation machine with five kinds of different impeller structures. The effects of impeller structures on the solid-liquid- gas multiphase turbulent flow characters and flotation dynamics parameters are analyzed.