The Application Study Of CFD Technology On Spiral Concentrator Structure Optimization

With the gradual depletion and exhaustion of mineral resources,the embedded particle size of useful mineral was getting smaller and smaller and the sorting was becoming more and more difficult.In order to obtain enough high quality mineral processing products to meet the needs of modern industry,it was the research focus and development direction of mineral processing equipment through optimizing the structure to improve the sorting efficiency.Spiral concentrator,as a kind of gravity separation equipment had been rapidly developed and applied due to its many advantages since it was invented.Especially in recent years,the research scholars had researched and developed lots of types of spiral concentrator through optimizing the structure of the spiral groove.However,these optimization design methods were basically based on the experimental experience model which lacked of machine rational research.In this paper,computational fluid dynamics(CFD)is applied to the structural optimization of the spiral concentrator,in order to improve the separation efficiency,the main research contents include:(1)Based on BL600 spiral chute(a kind of spiral concentrator)which was developed by BGRIMM,with the aid of FLUENT software and by using the multiphase flow field and discrete phase particle trajectory model,the spiral concentrator separation CFD model was established in this paper.Meanwhile,we simulated the sorting process and comparied the simulation results with already existing separation mechanism and mineral particles trajectory study results which proved that the reliability of the CFD model was established.It provided a research platform of numerical simulation for improvement and optimization of the spiral groove structure.(2)In order to improve the separation efficiency of the spiral concentrator,we put forward the optimization method which we added a certain structure of trench in the spiral surface.A variety of structure schemes were designed and the corresponding CFD model was established.With the aid of FLUENT software,the orthogonal simulation test was carried out.According to the results of simulation test,we put forward the evaluation mechanism of optimal scheme which the particles entered into the spiral groove inner edge in the shortest time.Through the analysis and evaluation,the optimal spiral concentrator structure scheme was obtained finally.(3)According to the optimal structure scheme which was obtained by orthogonal simulation test and based on the original type BL600 spiral concentrator,a prototype of the optimal structure was produced.In order to verify the reliability of the optimized prototype,we will take a piece of respectively from a prototype and the standard type BL600 spiral concentrator that assembled on the same BL600 spiral concentrator bracket to set up gravity test system and research on experimental comparison on separation of pyrite.Comparative test results indicated that,the separation performance of the prototype in this research was better than the standard type spiral concentrator's and it also verified the reliability and feasibility of ?the CFD model—the orthogonal simulation test—the optimal structure scheme? of the spiral concentrator structure optimization research methods which was proposed in this paper.The CFD technology was applied to the spiral chute flow modeling in this paper.For the first time,the optimization of the spiral groove structure was realized by the CFD technology and the orthogonal simulation test method and applicable sorting effect evaluation mechanism was proposed.Meanwhile,the optimization method and the results were verified by laboratory comparative test study.It explored a new path for the spiral concentrator optimization study which had a guiding significance on improving the separation efficiency of the industrial type spiral concentrator.