A certain amount of aluminum alloy cold-rolled scrap was added to the electrolytic aluminum liquid

and the ceramic foam plates with the filtering precision of 50ppi+50ppi and 50ppi+60ppi were adopted for filtration and purification

respectively.The effects of two kinds of on-line filtration and purification process on the microstructure and mechanical properties of 1235 aluminum alloy casting-rolling plates were analyzed by means of microstructure analysis such as optical microscopy（OM）

scanning electron microscope（SEM）

energy spectrum analyzer（EDS）.The results show that the ceramic foam filter plate with filtering precision of 50ppi+60ppi can reduce significantly the content of impurities in the melts

and improve obviously the purity and cleanliness of the melts.Compared with the ceramic filter plate with the filter precision of 50ppi+50ppi for on-line filtration

the number of large or cluster irregular inclusions was reduced greatly

and the pores and cracks in the microstructure were also reduced.Energy dispersive spectroscopy（EDS）analysis shows that the inclusions after improving the filtration process are mainly composed of Al

O

Fe and Si

which may be a compound inclusion composed of Al

2

O

3

and AlFeSi intermetallic compounds.