Publication: Synthesis of alumina based on industrial waste material
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Publication Date
2011
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CVR – Centro para a valorização de Resíduos
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Abstract
A hazardous waste generated in slag milling process by the aluminium industry was used
as a raw material for the synthesis of alumina, α-Al2O3. This waste is considered as
hazardous material in the European legislation due to the release of toxic gases
(hydrogen, ammonia, methane and hydrogen sulphide) in the presence of water. The
process developed in this work allows to obtaining 1 ton of alumina from 4 tons of
hazardous waste and generates an inert solid residue consisting principally of spinel,
corundum and quartz with possible uses in cements or glass industry. This process
consisted of two steps: in the first one, nearly 90% of aluminium present in the waste is
recovered as a nanocrystalline boehmite, γ-AlOOH by hydrothermal treatment of the
waste. In the second step, the alumina is obtained by calcination of the boehmite at
1400ºC in air. The chemical composition of the alumina obtained consisted of 95% Al2O3,
3.3% Fe2O3, 0.8% SiO2 and other minor oxides to balance.