NEW ALTERNATIVE FOR REUSE HAZARDOUS WASTE FROM THE PRIMARY ALUMINUM PRODUCTION PROCESS (SPL): PRODUCTION OF THE OPAL GLASS AND FRITS / Nova alternativa para reaproveitamento do resíduo perigoso gerado na produção de alumínio primário (SPL): obtenção de vidros opacos e fritas.

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

The solid waste from deteriorated linings of cells in the aluminum metal production is called spent pot lining or SPL. Because of the presence of leachable cyanide and fluoride compounds the SPL is classified by internationals standards and the Brazilian Association of Technical Standard (ABNT) as hazardous waste. The purpose of the present work is to evaluate the use of this carbonaceous fraction as a raw material to obtain glasses. This fraction or first cut is half of the total waste. Its a new alternative way for disposing this waste by thermally decomposing the cyanides and fixing part of the fluorides into the glass structure. This work also evaluates the use of SPL to obtain opal glasses and glass frits which could be further used as glazes in the ceramic industry. The SPL was previously heat treated and mixed to lime to eliminate carbon and to minimize the fluoride volatilization, respectively. The heat treatment conditions were optimized. The treated waste was mixed with other inorganic compounds to obtain opal glasses. The materials were analyzed to determine the final composition, corrosion resistance and microstructural characteristics. The treated SPL was also used to obtain glass frits with similar characteristics of commercial materials. These materials were compared to commercial materials considering specific criteria and the results were promising. In both cases the fluorine and cyanide contents were analyzed during the entire glass production process.

ASSUNTO(S)

fritas fritas vidros opacos resíduo spl resíduo reaproveitamento spl vidros opacos reaproveitamento

ACESSO AO ARTIGO

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