Study On Optimization Of Mineralization Environment In Fluidized Bed Flotation

In view of the inadequacy of the traditional reverse flow,mechanical agitation and jet mineralization,the turbulence degree is very uneven,the energy utilization rate is low and the mineralized turbulence is not adjusted according to the inability to adjust the material.A new idea of constructing the fluidized bed mineralized environment which is constructed with the properties of the flotation feed to adapt to the turbulence and the impact strength is proposed.The establishment of a three-phase fluidized-bed flotation column mineralization system using air-water-steel beads was established to clarify the relationship between the flow field environment and flotation performance of the fluidized-bed flotation column.Combining fluid dynamics characteristics of fluidized bed flotation columns,the influences of operating conditions,liquid-phase properties,and column structure on the performance parameters of environmental gas in the mineralization flow field and the bed structure in the mineralized area were studied;A prediction model of the gas holdup and bubble diameter in the fluidized bed flotation column mineralization flow field was proposed;The influence of the adjustment of the mineralization flow field environment on the slime separation effect was analyzed.During the optimization study of fluidized bed flotation column mineralization flow field environment,the distribution rule of bubble diameter and gas holdup in the mineralization flow field was determined by conductivity probe method and differential pressure method;the height of the packed bed was 0.289m,The gas velocity is 0.0255m/s,the apparent bubble velocity is 0.226m/s,the gas bubble diameter is 0.629mm,the gas holdup rate is 17.73%,and the bubble specific surface area flux is 242.58s^-1.It is the fluidized bed flotation column mineralization flow field.The optimal level of environmental optimization test;according to the experimental data using the 1stopt software,the corresponding gas holdup model correlations were established using the McQuardt method and the general global optimization method:.By studying the structural parameters of the bed,it is found that as the apparent water velocity and superficial gas velocity increase,the bed structure parameters increase.The bed filling height can weaken the bed fluctuation ratio and stabilize the bed.On the other hand,the expansion rate of the bed can be expanded,with little effect on the porosity of the bed;on this basis.The results of the research on the structural parameters of the bed in the mineralized area were used to propose the flow.Prediction model of bubble diameter in mineralized flow field of flotation column in chemical bed:D_b?28?.91441×Re_l.⁰⁰⁷⁷¹r^-.12785R.⁷⁸⁴⁰³e^-14.9994.The research on the separation of slime by fluidized bed flotation column is very important for reflecting the effect of the full-scale slime sorting;the coal slurry is divided under the conditions of optimal fluidized bed flotation column mineralization flow field conditions.The selection effect was significant,the yield of clean coal was69.96%,the clean coal ash content was 9.99%,and the flotation refinement index was48.79%.Fluidized bed flotation column selection of the appropriate apparent water speed and optimization of the bed filling structure can establish a turbulent mineralization environment based on flotation feed particle size and floatability,and the results of the study will be adopted for the follow-up industrial fluidization.The bed flotation column filling grain structure design and operation have certain theoretical support and practical value.