The Research Of Simulation And Experiment On Fabrication Of Water-based Magnetic Fe₃O₄ Fluid By High-energy Grinding Method

Magnetic Fe3O4 nanomaterials is a kind of multi-function material, it has good heat resistance, resistance, alkali resistance, corrosion resistance, good magnetic property and catalytic property.therefore, it has the good application prospect in acoustics, optics, thermology, electronics, medicine and biological engineering. It is also a kind of new sensing material, it can be used for the detection of combustible gas and toxic gas in the air and has the characteristics of high sensitivity and low energy consumption. Therefore, its fabrication method has attracted attention of scientists around the world. At present, the fabrication methods on Fe3O4 magnetic fluid include high-energy grinding method, inert gas in condensation method, arc evaporation method, the chemical method, etc. Nanometer material is commonly fabricated by high-energy grinding method, because of its simple process, low cost, high efficiency. After vertical dual-planetary ball mill starts, Fe3O4 magnetic particles become finer under grinding and shearing action of grinding balls. Change will happen about structure and property of particles with increasing grinding time.Many factors influence on grinding performance of fabrication of water-based magnetic fluid of Fe3O4, they are mainly structural parameters, process parameters and grinding time. Process parameters include again rotational speed, the filling rate of grinding balls, grade of grinding balls, ratio of balls and materials, etc. At first, this paper researched mainly that it influences on grinding performance of ball mill that is rotational speed and the filling rate of grinding balls by combining simulation and experiment, we can get the best rotational speed and the filling rate. Then,the best grinding time was got by studying that grinding time influence on structure and property of magnetic Fe3O4 particles under the optimal parameters. Finally, the best parameters were got by the conclusion, that influence fabrication of water-based magnetic fluid of Fe3O4 by SXQM.The works of the paper are as follows:(1) Two researched parameters that were taken are rotational speed and the filling rate of grinding balls, and the level values of every parameter are 3,Therefore,Nine simulation experiments are done. At the end of the EDEM simulation, relation curve graph that is rotational speed and the filling rate of grinding balls influences on grinding performance is deduced by researching that rotational speed and the filling rate of grinding balls influences on movement of grinding balls, total cutting power, loss of grinding power and energy utilization.(2) Parameter values whose grinding performance is the best were got which is that the rotational speed is 200r/min, the filling rate is 0.5 by researching roundly that rotational speed and the filling rate influences on total shearing power and energy utilization in nine simulations.(3) Grinding performance is the best when the rotational speed is 200r/min, the filling rate is 0.5.Therefore, simulation results and experiment results was coincident. the feasibility of EDEM simulation was verified.(4) The best grinding time was got by studying that grinding time influence on structure and property of magnetic Fe3O4 particles when rotational speed is 200r/min, the filling rate is 0.5.(5) Finally, the grinding performance is the best on fabrication of water-based magnetic fluid of Fe3O4 by SXQM when rotational speed is 200 r/min, the filling rate is 0.5 and the grinding time is 110h.This paper first got the best rotational speed and the filling rate. Then,it got the best grinding time.Finally, the optimal parameters were got that influence on fabrication of water-based magnetic fluid of Fe3O4.