| Flotation method is one of the most widely used and best in dressing methodworks selection of the fine and fine mineral material. Currently, the air enters theflotation tank have inflatable and self-absorption that①inflatable flotation machine isto rely on external let air into the interior of the flotation machine, general.②self-absorption flotation machine is use of negative pressure rely rotor rotation whenthe air inhaled. The latter not only reduces costs, but also easy to install and operate.To study the dynamics environment of mechanically self-absorption air flotationmachine, improve flotation performance, this article through the study of the flotationcharacteristics of multiphase flow inside the machine, and provide theoretical basis andtechnical guidance for the Structural design and optimal operation. For tin flotationprocess, the paper contrapose the20m3effective volume of mechanicallyself-absorption air flotation machine of internal flow characteristics and dynamicperformance expand system research, the main contents are as follows.(1) Based on the basic theory of multiphase flow and gas-solid-liquid three-phaseflow characteristics, ignoring the role of flotation reagents for pulp and bubbles,contrapose large-scale mechanically self-absorption air flotation machine of internalmultiphase flow expand in-depth research. Use of Mixture multiphase flow mode andRNG k-ε turbulent mode for the flow field of flotation machine is described by theeffective volume of BF-20three-dimensional model of the gas-solid-liquid three-phaseflow flotation machine fluid20m3of fluid dynamics analysis, flotation kinetics wereobtained under different environmental parameters.(2) Using FLUENT software for BF-20-type flotation machine in three different rotor speed, internal flotation machine under three different granularity multiphaseflow to numerical simulation and analysis, access to the rotor speed and differentmineral grains degrees influence of within the flow characteristics and relationshipbetween the rotor speed and flotation kinetic parameters, drawn: the rotor speed is toosmall result gas-solid hard to mix, and excessive speed is not conducive to a solidphase as well as from the rising bubbles, three speeds range when147rpm~196rpmrange flotation was better, and close to196rpm appropriate.(3) Through the internal flow field analysis and simulation experiment, animproved scheme BF-20-type flotation machine structural parameters, obtainedmovement inside the flotation characteristics and turbulence intensity contours of thethree-phase flow, draw: when30oand45oangle, rotating the region of close to the wallhave no dead and has sufficient strength, which to the benefit of the three-phase mixed;when45oangle, solid and liquid close to the rate of increase in the transportation area,which will help the solid transport; when30oand45oangle the surface calm, favorablefor flotation. The angle too large or too small are easy to produce dead, mixing zonenear the wall turbulence intensity is weak, on the flotation disadvantage. |
