Acid Extraction of Aluminum from Coal Ash

Overview

To efficiently remove aluminum from coal fly ash, a two-step acid leaching method was used. The first leaching residue was acquired through a direct leaching of coal ash with 10 molar sulfuric acid at a 2:1 acid-to-ash ratio. The mixture was heated between 130-135 degrees celsius and stirred constantly for two hours. The first leaching residue and first leachate were obtained through vacuum filtration. The first leachate was analyzed for Al content using atomic absorption spectroscopy and the efficiency of the first extraction was calculated to be 26.84 percent. The first leaching residue was dried to remove residual moisture and the leaching process was repeated with a smaller quantity of ash, a 3:1 acid-to-ash ratio, and an improved stirring method. The second leaching residue was obtained through filtration and analyzed using the previous method and the extraction efficiency was calculated to be 72.89 percent.

Competition history

• AJAS 2018 Category not listed

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