Recycling of Secondary Aluminum Dross to Fabricate Porous <i>γ</i>-Al<sub>2</sub>O<sub>3</sub> Assisted by Corn Straw as Biotemplate — Oak Academic Publishing
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Recycling of Secondary Aluminum Dross to Fabricate Porous <i>γ</i>-Al<sub>2</sub>O<sub>3</sub> Assisted by Corn Straw as Biotemplate
College of Mechanical and Electronic Engineering, Northwest A&F University, Yangling, China
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College of Mechanical and Electronic Engineering, Northwest A&F University, Yangling, China
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College of Mechanical and Electronic Engineering, Northwest A&F University, Yangling, China
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College of Mechanical and Electronic Engineering, Northwest A&F University, Yangling, China
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College of Mechanical and Electronic Engineering, Northwest A&F University, Yangling, China
1 College of Mechanical and Electronic Engineering, Northwest A&F University, Yangling, China
2 College of Mechanical and Electronic Engineering, Northwest A&F University, Yangling, China
3 College of Mechanical and Electronic Engineering, Northwest A&F University, Yangling, China
4 College of Mechanical and Electronic Engineering, Northwest A&F University, Yangling, China
5 College of Mechanical and Electronic Engineering, Northwest A&F University, Yangling, China
In the aluminum industry, secondary aluminum dross (SAD) is an inevitable solid residue, which usually contains 30 - 70 wt% Al 2 O 3 . In this work, Al(OH) 3 was extracted from SAD through acid-leaching and alkali purification process. The as-obtained Al(OH) 3 precipitation then was calcinated to synthesize porous γ -Al 2 O 3 assisting by an agricultural waste biomass-corn straw as biotemplate. Effects of H 2 SO 4 concentration, reaction temperature and time on the recovery of SAD were investigated. Furthermore, the dependence of calcination temperature on specific surface area, pore volume and content of porous γ -Al 2 O 3 was analyzed. X-ray diffraction (XRD) and X-ray fluorescence (XRF) were used to inspect the phase compositions and their contents, respectively. Scanning electron microscopy (SEM) was employed to analyze the morphologies of the sintered porous γ -Al 2 O 3 . It was found that the highest recycle rate of aluminum from SAD was obtained under optimum conditions of 80 ° C, acid concentration of 1.6 mol/l, and reaction time of 5 h by acid process. The porous γ -Al 2 O 3 with specific surface area, 261.22 m 2 /g and average pore diameter, 52.64 nm, was obtained under calcination at 850 ° C through mixing the as-obtained Al(OH) 3 precipitation and corn straw.
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