Study On The Recycling Of Waste Aluminum Cans And Modification Of Recycled Aluminum Alloy

In this paper,the high temperature de-coating process of can sheet is studied through a special can de-coating furnace,the influence of de-coating process on coating was analyzed by using body microscope and Fourier transform infrared spectroscopy.The recycled aluminum alloy was obtained by melting the treated can fragments,and the regenerated Al-Re alloy was prepared by using the rare earth element as the modifier.The microstructure of the alloy was observed by scanning electron microscopy and energy spectrum analysis,X ray diffraction analysis and optical microscope.The influence of the Ce content on the microstructure and room temperature mechanical properties of the regenerated Al-Mn-Mg alloy was studied.The effects of the isothermal treatment(treatment temperature,treatment time)on the microstructure of the semi-solid alloy were analyzed by semi-solid isothermal treatment on regenerated Al-Mn-Mg alloy,and the following main conclusions were obtained:1.The double action of high temperature with oscillation can achieve good de-coating effect,and the components with complex functional groups after high temperature treatment are almost broken into small molecule material,and then removed from the surface,and the solid-state carbides produced by the coating of the can are separated from the surfaces by the oscillation;Under the conditions of holding at 540 ? for 20 min and rotating for 10min,the paint is basically removed.2.Adding rare earth elements to the regenerated alloy can make the grain microstructure of the alloy refined,when the Ce content is 1.0wt%,the refinement effect of the alloy grains is the best,and the grain refined effect becomes worse with the increase of Ce content.3.With the increase of Ce content,the tensile strength and elongation at room temperature of as-cast Al-Mn-Mg-xCe alloys increase first and then decrease.When the Ce content is 1.0wt%,the room temperature tensile strength of the alloy reaches 175.49MPa.Compared with the regenerated Al-Mn-Mg alloy,the tensile strength increases by 13.59%and the elongation increases by 26%.The Brinell hardness of the as-cast Al-Mn-Mg-xCe alloy is basically the same as that of the room temperature tensile strength and elongation.When the Ce content is l.Owt%,the hardness reaches a peak value of 47.37HB.4.The isothermal heat treatment is applied to the recyclable aluminum of used cans.Isothermal temperature and holding time will affect the semi-solid microstructure of the alloy.While holding for same time,with the increase of temperature,the dendrite of semi-solid structure is fused,the grains are refined,grown up and the amount of liquid phase is also increasing;Under 650? conditions,with time lengthening,the semi-solid grains are segmented into polygons with different concave and convex shapes,and then gradually rounded to rule.The grain size and shape tend to be homogeneous and roundness under the semi-solid processing of holding for 30min.