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Effects Of Rotation Speed And Media Loading On Grinding Performance Of A Horizontal Stirred Mill

Posted on:2015-07-21Degree:MasterType:Thesis
Country:ChinaCandidate:Y H QiFull Text:PDF
GTID:2181330431476549Subject:Mechanical design and theory
Abstract/Summary:PDF Full Text Request
At present, ultrafine powders are widely used in metallurgy, chemical industry, energy, etc, and occupy the important position in the national economy of each country. There are a lot of kinds of preparation methods of ultrafine powders to meet the requirements of the current scientific development. However mechanical preparation of ultrafine powder still occupies an important position in all preparation methods. Due to the advantage of high energy utilization, producing particles with small and concentration size and easy operation, the horizontal stirred mill has attracted attention of the world in all equipment for mechanical preparation. But due to the complexity of the movement of the horizontal stirred mill and the weak basic theory, the research is at low level yet.There are many parameters affecting the grinding effect of the horizontal stirred mill and the parameters are mainly divided into structural parameters and process parameters. Process parameters include rotation speed, medium filling rate, medium size, physical properties of the medium, the ball material ratio, etc. This paper explores effect of rotation speed and media loading on grinding performance of the horizontal stirred mill using the combined method of experiment and simulation on φ230×338prototype. And it eventually obtains an experimental group with the ability broken material and the highest energy utilization through the optimization of two working parameters. The following is the main research content of this article:(1) It selects4rotation speeds and5filling rates to constitute20simulation experimental groups and conduct the simulation in the EDEM. By studying the effect of; otation speed and medium filling rate respectively on the movement of the medium, the mean collision energy, the collision frequency, the total collision energy, the power and the energy utilization, it draw the conclusion of the effect of the rotation speed and medium filling rate on the grinding performance. (2) Comprehensive considering the mean collision energy and energy utilization, it gets the experimental group with the best grinding effect by optimizing the parameters on20experiment groups.(3) By simplifying the structure of the horizontal stirred mill used in the production, it designs an experiment prototype which can not only compare with the simulation model of EDEM, but also conduct the dry bulk grinding silica sand experiment.(4) After the experiment of experimental prototype, it compares between the results of simulation and experiment at two aspects of the consumption power and crushing energy. According to the same general trend of the both results, the EDEM simulation model is proved to have feasibility. Then an analysis of the both numerical difference lays the foundation for later study.(5) It analyzes the effect of the rotation speed and medium filling rate on the material distribution after grinding, and then in the macroscopic angle it explains the effect of the two working parameters on the grinding performance of the horizontal stirred mill further.This paper study the effect of the rotation speed and medium filling rate on the grinding performance of the horizontal stirred mill through the two methods of simulation and experiment and compares the results. It lays a foundation for being able to establish a prediction model between the experiment and simulation and being easy to optimize a large number of parameters with using simulation software.
Keywords/Search Tags:rotation speed, medium filling rate, horizontal stirred mill, grindingperformance
PDF Full Text Request
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