Produção e caracterização de espumas cerâmicas obtidas a partir de lodo de anodização de alumínio

Ceramic foams were produced from a sludge generated in the aluminum anodizing process by using an industrial polyurethane foam (replication method) with open cell sizes of 10 ± 5 ppi (porosity = 97%) which were impregnated with suspensions containing 50-61 wt.% alumina, 1 wt.% citric acid, 6 wt.% be...

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Bibliographic Details
Published in:Química Nova 2012, Vol.35 (1), p.143-148
Main Authors: Moraes, Graziela Guzi de, Rodrigues Neto, João Batista, Hotza, Dachamir, Oliveira, Antonio Pedro Novaes de, Oliveira, Bianca Goulart de, Oliveira, Therezinha Maria Novais de
Format: Article
Language:English
Subjects:
alumina
ceramic foams
wastes
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Summary:Ceramic foams were produced from a sludge generated in the aluminum anodizing process by using an industrial polyurethane foam (replication method) with open cell sizes of 10 ± 5 ppi (porosity = 97%) which were impregnated with suspensions containing 50-61 wt.% alumina, 1 wt.% citric acid, 6 wt.% bentonite and fired at 1600 ºC for 2 h. The aluminum anodizing sludge shows a high alumina content (87.5 wt.%) and a low particle size (~1.7 mm) after calcination and milling. The obtained filters show porosity of approximately 70%, filtration capability (mass water flow) of 1.7 kg/s and mechanical strength under compression of 2.40 MPa.
ISSN:0100-4042
1678-7064
DOI:10.1590/S0100-40422012000100026