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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Studies on the use of aluminum processing residues as raw material ceramic / Estudos sobre a utilizaÃÃo de resÃduos do beneficiamento do alumÃnio como matÃria-prima cerÃmica

Gilberto Rocha Santiago Junior 03 October 2008 (has links)
FundaÃÃo de Amparo à Pesquisa do Estado do Cearà / Os resÃduos da produÃÃo de aluminio a partir da bauxita, chamados de borra, contÃm uma quantidade razoÃvel daquele metal, justificando seu reaproveitamento. ApÃs a retirada do aluminio em fornos rotatÃrios com sal fundido, resta uma âborra pretaâ, rica em sais solÃveis (50 a 70%), e contendo uma boa quantidade de aluminio (cerca de 5%). Esse material à danoso ao ambiente, exigindo tratamentos e aterros especÃficos. à possÃvel utilizÃ-lo como matÃria-prima para as indÃstrias de cimento e de refratÃrios, devido, principalmente, à elevada quantidade de alumina presente. Este trabalho apresenta resultados preliminares para a utilizaÃÃo da borra preta, apÃs retirada do sal por lavagem, como matÃria-prima cerÃmica. Foram prensadas amostras (26 MPa) e sinterizadas a 1000, 1200 e 1500ÂC. O material foi caracterizado por DifraÃÃo de Raios X, FluorescÃncia de Raios X, AnÃlise TermogravimÃtrica e BET. Foram realizados ensaios de absorÃÃo de Ãgua, retraÃÃo linear, resistÃncia a flexÃo e micro-dureza, para avaliar as propriedades das peÃas obtidas. / Aluminum dross from the processing of bauxite ores still contain a reasonable amount of metallic Al. Therefore, it is attractive for many companies to recover the remaining Al from the dross in rotary furnaces usin g molten salts. The residue from this operation, called salt cake, is rich in solubl e salts (50 a 70%), and still contains about 5% Al. This material is harmful to the enviro nment and must be properly treated and disposed. It is possible to use it as a raw material for the cement and refractory industries, due to the high amounts of a lumina present. This work presents preliminary results on the use of a black dross (after salt removal by washing ) for the manufacturing of refractory ceram ics. Test pieces were pressed at 26 MPa and fired at 1000, 1200 e 1500ÂC. The mat erial was characterized by X! ray diffraction and X!ray fluorescency. Water absor ption, linear retraction and microhardness tests were also performed in order to assess the properties of the samples

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