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Waste Management & Research, Vol. 24, No. 1, 60-66 (2006)
DOI: 10.1177/0734242X06061155

Recycling of iron foundry sand and glass waste as raw material for production of whiteware

Saulo R. Bragança

Ceramic Materials Laboratory - LACER/UFRGS, Porto Alegre-RS, Brazil, saulorb{at}ufrgs.br

Juliane Vicenzi

Ceramic Materials Laboratory - LACER/UFRGS, Porto Alegre-RS, Brazil

Kareline Guerino

Ceramic Materials Laboratory - LACER/UFRGS, Porto Alegre-RS, Brazil

Carlos P. Bergmann

Ceramic Materials Laboratory - LACER/UFRGS, Porto Alegre-RS, Brazil

The purpose of this study was to evaluate the production feasibility of triaxial whiteware using sand from cast iron moulds as a raw material instead of silica, and recycled glass in place of feldspar. Formulations were prepared using sand, glass waste, and white-firing clay such that only 50% of the composition was virgin material (clay). The ceramic bodies were formed by pressing and fired at different temperatures (between 1100 and 1300°C). Specimens were characterized in terms of green density prior to firing; and their flexural strength, linear shrinkage, and water absorption were measured after firing. The microstructure was determined by scanning electron microscopy. Possible environmental impacts of this recycling process were also evaluated, through solubility and leaching tests, according to Brazilian standards. Gaseous emissions during the firing process were also analysed. The results showed that it is possible to produce triaxial ceramics by using such alternative raw materials.

Key Words: Glass waste • ceramics • foundry sand • residues • wmr 859-3


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