Study On The Effect Of Ultrasonic Vibration Assisted Filtration For Recycling Aluminum

Aluminum is widely used in the production of various lightweight industries and the development of various new products.At the same time,aluminum has excellent recyclable,which prompted the rise of recycled aluminum industry.In order to ensure the quality of recycled aluminum in the recovery and production of recycled aluminum,higher requirements are put forward for the metal microstructure and properties,impurity removal and gas removal efficiency.The purpose of this paper is to remove the gas and inclusion particles in molten metal,refine the solidification structure of molten metal and improve the performance of billet.The ultrasonic wave with high frequency vibration was directly added to the ceramic foam filter.During the experiment,the porosity of the ceramic foam filter,the ultrasonic power and the pouring temperature were controlled to study the influence of this method on the microstructure and properties of the aluminum melt,the filtering effect and the degassing effect.The results show that:(1)Microstructure and mechanical properties: Through the observation of macro and microstructure and analysis of mechanical properties of recycled aluminum,it is found that the microstructure of recycled aluminum is refined and the average grain size is reduced with the increase of porosity,and the mechanical properties are improved.The mechanical properties are the best at 10 ppi.With the increase of ultrasonic power,the refinement effect of recycled aluminum is enhanced,and the mechanical properties are enhanced with the increase of ultrasonic power.The microstructure was refined and the mechanical properties were the highest at 700°C pouring temperature.(2)Effect of impurity removal: The filtration efficiency was calculated by measuring oxygen content in recycled aluminum by EDS,and the size and distribution of inclusions in1000× field of vision were observed.It was found that the filtration efficiency increased gradually with the increase of porosity,and the size and number of inclusions observed decreased.When the ultrasonic power increases,the size and number of inclusions observed with the increase of filtering efficiency decrease.When the pouring temperature increases,the size and number of inclusions observed by the filtration efficiency increase decrease.The best combination of impurity removal efficiency is 720°C pouring temperature 15 ppi filter 150 W ultrasonic treatment.(3)Degasification effect: By counting the density of aluminum ingot and the size and number of pores in the longitudinal section after aluminum liquid hydrogen analyzer treatment,it is found that the density of the ingot increases gradually with the increase of porosity,and the number and size of pores in the longitudinal section decrease gradually.With the increase of ultrasonic power,the density of ingot gradually increases,and the number and size of longitudinal section pores gradually decrease.When the pouring temperature increases,the density of the ingot increases first and then decreases,and the number of pores in the longitudinal section is the lowest at 700°C.