Preparing of Alumina from Aluminum Waste


Authors : Noor Abdulateef Ghulam, Mohammed Nsaif Abbas, Dawood Eisa Sachit.

Volume/Issue : Volume 4 - 2019, Issue 3 - March

Google Scholar : https://goo.gl/DF9R4u

Scribd : https://bit.ly/2UkPxEt

Thomson Reuters ResearcherID : https://goo.gl/KTXLC3

Abstract : This research aims to take advantage of Aluminum Foil Waste (AFW) through using it as a raw material for preparing alumina (Al2O3), by the precipitation method. The effect of Hydrochloric Acid (HCl) concentration, on the digestion of AFW, was studied by varying it from 1 to 6 M, Sodium Hydroxide (NaOH) was used as precipitation agent, to precipitate the aluminum hydroxide from AlCl3 obtained from previous step by raising the pH to different values (from 3 to 13) to study the effect of pH on precipitation process. It was found that the best acid concentration to digest the AFW was 5M, also the best pH to precipitate the Al(OH)3 was 9. Then the Al(OH)3 was washed, crushed, and dried at 105oC for 24 hr., and then it was converted to alumina by calcination process using different calcination temperatures (550, 675, and 800oC) to study the effect of calcination temperature on the resulting alumina. The purity of the prepared alumina investigated by XRF test, and it was more than 97% for the three samples which calcined at three different temperatures. The study of the evolution of crystalline phases of obtained powders was accomplished through XRD studies. XRD data showed that the samples calcined at 550, 675, and 800°C has γ-Al2O3 phase. Also the surface area was tested by using BET method, high surface area was obtained at 550oC about 246m2/g and it was decreased with increasing the calcination temperature.

Keywords : Alumina, Aluminum Waste, Aluminum Foil Waste, XRD, Surface Area.

This research aims to take advantage of Aluminum Foil Waste (AFW) through using it as a raw material for preparing alumina (Al2O3), by the precipitation method. The effect of Hydrochloric Acid (HCl) concentration, on the digestion of AFW, was studied by varying it from 1 to 6 M, Sodium Hydroxide (NaOH) was used as precipitation agent, to precipitate the aluminum hydroxide from AlCl3 obtained from previous step by raising the pH to different values (from 3 to 13) to study the effect of pH on precipitation process. It was found that the best acid concentration to digest the AFW was 5M, also the best pH to precipitate the Al(OH)3 was 9. Then the Al(OH)3 was washed, crushed, and dried at 105oC for 24 hr., and then it was converted to alumina by calcination process using different calcination temperatures (550, 675, and 800oC) to study the effect of calcination temperature on the resulting alumina. The purity of the prepared alumina investigated by XRF test, and it was more than 97% for the three samples which calcined at three different temperatures. The study of the evolution of crystalline phases of obtained powders was accomplished through XRD studies. XRD data showed that the samples calcined at 550, 675, and 800°C has γ-Al2O3 phase. Also the surface area was tested by using BET method, high surface area was obtained at 550oC about 246m2/g and it was decreased with increasing the calcination temperature.

Keywords : Alumina, Aluminum Waste, Aluminum Foil Waste, XRD, Surface Area.

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