Research Of Magnesite Flotation Device Based On Jet Flow And Its Structure Optimization

With the continuous advancement of industrialization,the development of high temperature industry is particularly important.High temperature industry is indispensable to guarantee the development of large-scale engineering construction and equipment manufacturing technology.The preparation of refractories is an important link to the development of high-temperature industry.This causes the research on the preparation process of magnesite and the main raw material of refractories,has attracted more and more scholars’ attention.Although country has the first reserves of magnesite mineral resources in the world,but in the early years of excessive mining of high-quality mineral resources,led to the lowgrade magnesite was abandoned freely,cause the environment pollution,and result in a more serious waste of resources.Therefore,it is urgent to make reasonable use of low-grade ore and screen low-grade magnesite,so as to transform "magnesium waste" into treasure.The main research object of this thesis is the structure optimization and device design of magnesite flotation machine using jet flotation.Firstly,by exploring the mechanism of ore capture by flotation machine and analyzing the way of low-grade magnesite ore,the key parameters affecting the capture rate of magnesite are confirmed.The turbulent kinetic energy range and bubble size range suitable for magnesite flotation are further investigated,analyzed and calculated.On this basis,an improved jet flotation machine is designed.Compared with the traditional jet flotation machine,the advantages of the improved jet flotation machine for magnesite flotation are verified,and the correctness of the improved direction is confirmed.Secondly,in view of the shortcomings of the improved jet flotation machine,further,the different structural parameters under different structural forms are studied by means of simulation and comparative analysis.The influence of different parameters of the same structure on the flotation trend is compared and analyzed.On the premise of uniform flow field,the key structural parameters of the improved jet flotation machine are optimized and adjusted by structural parameters selected.The improved flotation machine is more suitable for magnesite flotation.Thirdly,it is difficult to carry out targeted flotation for different kinds of ore and different particle size in the flotation process at the present stage.Moreover,the target mineral content of tailings is too high.Therefore,the flotation machine is designed with supplementary optimization.The jet flotation machine can take into account the flotation of magnesite,and can also be modified to quickly meet the flotation of other kinds of ores or extreme fine grain cases.Through the design of the key device of the new jet flotation machine and the new ore capture device,the flotation machine can reduce the content of target minerals in tailings.The minerals lost due to the fragmentation of mineralized bubbles are collected to improve the recovery rate of the flotation machine and reduce the content of target minerals in the tailings.The flotation recovery rate of the flotation machine is further improved.Finally,beneficiation comparison tested for magnesite from a magnesite mountain in southern Liaoning was carried out.The particle size of 61.94% magnesite powder is larger than +45μm.The experimental objects are the improved jet flotation machine after optimization and the mechanical agitation flotation machine used in the traditional magnesite flotation.By comparing the recovery grade and recovery rate of the two flotation machines,the advantages of the improved jet flotation machine for the flotation of magnesite are verified.A feasible and effective design idea is provided for the application of jet flotation machine in magnesite flotation.Some reference basis is provided for the research of effective recovery methods of low-grade ore.