| As a basic raw material,metallic minerals are widely used in many fields such as metallurgy,ceramics,chemicals and machinery.As a classic method in the field of gravity separation,shaker beneficiation is widely used due to its pollution-free,low energy consumption and simple equipment.With the rapid development of national infrastructure undertakings,the demand for minerals is increasing day by day.Therefore,the requirements for the beneficiation efficiency and beneficiation particle size of the shaker beneficiation are also constantly increasing.In this paper,the cloud tin shaker is used as the research object,and the solid-liquid two-phase flow field on the bed surface is numerically simulated by the computational fluid dynamics Fluent software.The influence of the shaker motion parameters on the flow field and separation performance is analyzed,and the electronic cam is used instead of the mechanical cam.And its transmission components,an electronic rocking head control system is built to realize the control of the motion parameters of the rocking table.The main research work is as follows:(1)Summarize the more commonly used two-phase flow models,introduce and select commonly used solvers.For the beneficiation shaker,select the Euler-Euler two-fluid model and the turbulence model to simulate the bed surface flow field.Introduced the separation principle and flow characteristics of the thin-layer inclined flow when mineral separation on the shaker,and analyzed the force of a single particle in the flow field.(2)The yun-tin shaker uses the cam lever mechanism to output the motion curve to drive the bed surface to reciprocate and vibrate,thereby realizing the separation of minerals.Different minerals have their own suitable combination value of stroke and stroke due to their own material characteristics.Therefore,the suitable combination value of stroke and stroke can be calculated by the material characteristics of the selected minerals.The direct differential analysis method is used for actual measurement,and the actual dynamic value of the table movement of the shaking table is calculated.The Fourier curve fitting is carried out with the toolbox of Matlab curve fitting,and the fitted curve is used as the expression of the table movement of the shaking table,To complete the subsequent numerical simulation of the flow field.(3)Given the selected minerals,ensure that other operating parameters remain unchanged,analyze the separation law of mineral particles of different sizes in the flow field,and obtain the distribution of the same mineral particles on the bed surface as the particle size increases.It is more sufficient and is more conducive to the separation of minerals;using different stroke strokes to simulate the flow field of the bed surface with 0.5mm quartz and tin ore particles.When the quartz particles have a stroke of 8mm and a stroke of 360 times/min,The distribution on the bed surface is more sufficient,and there is a faster transportation speed in the longitudinal direction of the bed surface,which is more conducive to the separation of minerals;while the tin ore particles are at a stroke of 22 mm and a stroke of 270 times/min.The bed surface is more fully distributed,and there is a faster transportation speed in the longitudinal direction of the bed surface,which is more conducive to the separation of minerals.(4)In view of the cumbersome change of the motion curve of the existing shaker and the small adjustable range of parameters,a brief construction of an electronic shaker head control system was made.The system can quickly change the movement curve of the bed surface of the shaker,and at the same time can adjust the stroke and stroke value in a larger range to meet the selection requirements of different minerals. |
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