Author(s)

Senjing Zhang, Weijun Zhu, Qingda Li, Wenjie Zhang, Xuemei Yi^*

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% Al₂O₃. 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-Al₂O₃ assisting by an agricultural waste biomass-corn straw as biotemplate. Effects of H₂SO₄ 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-Al₂O₃ 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-Al₂O₃. 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-Al₂O₃ with specific surface area, 261.22 m²/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.

Secondary Aluminum Dross, Purification, Biotemplate, Corn Straw, Al₂O₃

Zhang, S. , Zhu, W. , Li, Q. , Zhang, W. and Yi, X. (2019) Recycling of Secondary Aluminum Dross to Fabricate Porous γ-Al₂O₃ Assisted by Corn Straw as Biotemplate. Journal of Materials Science and Chemical Engineering, 7, 87-102. doi: 10.4236/msce.2019.712010.