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dc.contributor.authorFernandes, Iara Janainapt_BR
dc.contributor.authorEvaldt, Daiane Calheiropt_BR
dc.contributor.authorSánchez, Felipe Antonio Luccapt_BR
dc.contributor.authorCamacho, Alini Luísa Diehlpt_BR
dc.contributor.authorRocha, Tatiana Louise Avila de Campospt_BR
dc.contributor.authorMoraes, Carlos Alberto Mendespt_BR
dc.contributor.authorSousa, Vânia Caldas dept_BR
dc.date.accessioned2018-10-03T02:36:37Zpt_BR
dc.date.issued2017pt_BR
dc.identifier.issn1516-1439pt_BR
dc.identifier.urihttp://hdl.handle.net/10183/183052pt_BR
dc.description.abstractAs a byproduct of the combustion of rice husk to generate energy, rice husk ash (RHA) is formed by silica and carbon, apart from small amounts of other constituents. Several treatments can be used to increase the purity of the silica obtained, or even produce pure silica. The present study tested the efficiency of different techniques to obtain silica, characterizing and comparing the silicas obtained from RHA. A literature review was conducted, and then selected techniques were used to produce silica, which was characterized by XRF, XRD, particle sizing, specific weight, specific surface area, total carbon, and SEM. The literature review showed that most techniques include a pretreatment like acid or alkaline leaching followed by thermal treatment to increase the amount of silica produced by reduction of carbonaceous materials. The results showed that it is possible to produce silica from RHA using simple methods, and that these produced silica with purity above 98%. The treatments that afforded the best results were acid leaching followed by thermal treatment at 800ºC, and alkaline extraction at low temperature, with silica purity of 99.3% and 99.6%, respectively.en
dc.format.mimetypeapplication/pdfpt_BR
dc.language.isoengpt_BR
dc.relation.ispartofMaterials research : ibero-american journal of materials. São Carlos, SP. Vol. 20, supl. 2 (2017), p. 512-518pt_BR
dc.rightsOpen Accessen
dc.subjectRice husk ashen
dc.subjectCinza de casca de arrozpt_BR
dc.subjectSílicapt_BR
dc.subjectSilicaen
dc.subjectTratamento térmicopt_BR
dc.subjectThermal treatmenten
dc.titleCharacterization of silica produced from rice husk ash: comparison of purification and processing methodspt_BR
dc.typeArtigo de periódicopt_BR
dc.identifier.nrb001078114pt_BR
dc.type.originNacionalpt_BR


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