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Abstract
The present work is directed to the production of
aluminium oxide (Al2O3), known as alumina, from the solid waste cake produced as a by – product from aluminium small factories.
Aluminium ions in the solid waste are separated as aluminum sulfate in case of leaching by concentrated sulfuric acid, then it calcined at 1000 0C to produce alumina or as sodium aluminate (NaAlO2) as a result of leaching the solid waste with caustic soda solution.
Aluminium hydroxide is precipitated from NaAlO2 solution by different modes through the hot solution.
The resulting precipitate has been separated by filtration, dried at ~100 Oc, and then calcined at ~ 600 or 1000 Oc to produce alumina of γ- or α- form, respectively.
The produced alumina can be used in different applications such as sorption and separation of Cr(III), Cr(VI) from their mixture, and Fe(III) from commercial phosphoric acid.