Al-rich sludge treatments towards recycling

A treatment method towards recycling of Al-rich sludges to produce high-alumina refractory ceramics is proposed. These sludges are collected in wastewater treatment units of industrial plants dealing with anodising or surface coating processes. This industrial residue usually contains significant am...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2002-12, Vol.22 (13), p.2243-2249
Main Authors: Ferreira, J.M.F, Olhero, S.M
Format: Article
Language:English
Subjects:
Al 2O 3
Applied sciences
Building materials. Ceramics. Glasses
Chemical industry and chemicals
Exact sciences and technology
Leaching
Other industrial wastes. Sewage sludge
Pollution
Recycling
Refractories
Refractory products
Silica-alumina refractories
Slip casting
Sludge
Wastes
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Summary:A treatment method towards recycling of Al-rich sludges to produce high-alumina refractory ceramics is proposed. These sludges are collected in wastewater treatment units of industrial plants dealing with anodising or surface coating processes. This industrial residue usually contains significant amounts of soluble salts such as Na, K, Mg, Ca and Al sulphates that make direct recycling problematic. The removal of these salts from the as-received sludges by washing is ineffective due to its gel-like consistency. The treatment consists of calcining and subsequent washing operations, followed by removal of sulphates by precipitation as BaSO 4. The treated sludges could then be well dispersed and processed by slip casting.
ISSN:0955-2219
1873-619X
DOI:10.1016/S0955-2219(02)00023-7