Structural Design And Experimental Study On Sampling Principle Of Sepiolite Ultrafine Powder Jet Classification

Sepiolite,a fibrous silicate mineral,is one of nonmetal mineral materials with is used most.The progress in ultrafine particles processing and nanotechnology has brought the research,development and application on sepiolite ultrafine powders into a new stage.Thus a jet fluid screening prototype of sepiolite ultrafine powders was designed in this paper.The prototype was designed based on the existing ultra-fine powder grading technology and theoretical research results.On the basis of the prototype,this thesis also researched into the directions in terms of basic theory,structure optimization of critical parts,integral structural design and powder screening test of the prototype.(1)The analysis of sepiolite ultrafine powder jet classification.Based on the principles of jet fluid basic theory and Coanda Effect,this thesis designed major airflow mechanism and screening room of a jet fluid screening of sepiolite ultrafine powders.(2)The structure design of sepiolite ultrafine powder jet classification.According to the theory of jet classification,the structural design of the main air flow parts,the classification chamber components and the auxiliary air flow parts is designed to design the sepiolite superfine powder jet classification principle.(3)Structural optimization of principle prototype parts.This thesis researched into the nozzle and Coanda block which generate the Coanda Effect based on the ANSYS-CFX finite element analysis software.According to the structural optimization of the main air nozzle,the internal flow field of the flat mouth nozzle is simulated and analyzed by the orthogonal test method.According to the structural optimization of Coanda block,the flow field movement for different curvature is simulated and analyzed,and the structural optimization size is obtained.Based on the follow ability study of sepiolite particles in the turbulent flow,the particle movement of the graded chamber is simulated and analyzed,and the structure of the classification chamber is optimized.(4)Experimental study on powder grade of sepiolite ultrafine powder jet classification.According to the results of graded experiments,the first conclusion tested the reliability of the stimulated analysis of the Coanda Effect of different nozzles and Coanda block with different curvatures.The second conclusion found outthe best control parameters of the prototype by conducting an orthogonal test on the factors that affecting the screening sufficiency.And it used type VHX-2000Cdepth-of-fieldmicroscope to observe the diameter of the screened powders and discovered that the diameters of most powders are under 10 ?m.In conclusion,a jet fluid screening prototype of sepiolite ultrafine powders was developed in this paper.What's more,the particals whose diametersare less than 10?m can be screened so as to screen ultrafine powders by the screening test of prototype.