Argilominerais: influência dos aditivos (cinza de bagaço de cana-de-acúcar e rocha sedimentar) no processo de sinterização
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Data
2008-06-20
Autores
Souza, Agda Eunice de [UNESP]
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Universidade Estadual Paulista (Unesp)
Resumo
Foi estudada a influência de cinza de bagaço de cana e rocha sedimentar, adicionadas a um material argiloso, durante o processo de sinterização. O material argiloso e os aditivos foram caracterizados utilizando Difratometria de Raio X, Espectrometria de flurescência de Raio X e Análise Térmica. As amostras de cinza e rocha foram moídas, peneiradas a 0,088 mm e 0,125 mm, respectivamente, e incorporadas nos teores de 0, 20, 40, 60 e 80% em massa ao material argiloso. Foram preparados corpos de prova, prensados uniaxialmente a 19 Mpa, para cada corpo de prova, em uma prensa manual. As peças foram sinterizadas nas temperaturas de 500, 800, 900, 1000, 1100 e 1200º C, usando um forno tipo mufla e, posteriormente, submetidos a análise difratométrica e a ensaios físicos e mecânicos de absorção de água, retração linear de queima, massa específica aparente, perda de massa ao fogo, porosidade aparente e módulo de ruptura à flexão. A difratometria de raios X mostrou que a cinza é composta de material cristalino, predominantemente quartzo; a rocha sedimentar apresentou, além de quartzo, argilominerais micáceos e o material argiloso teve como fase principal a caulinita, contendo ainda hidróxido de alumínio e óxidos de ferro em menores concentrações. A análise química mostrou que, além do silício, a cinza e a rocha sedimentar apresentaram concentrações de óxidos de alumínio, potássio, cálcio, ferro e magnésio, enquanto que no material, os óxidos de silício, alumínio, ferro e titânio foram predominantes. As análises térmicas das diferentes misturas mostraram algumas reações que indicam transformação (inversão do quartzo), decomposição (perda de hidróxidos) e formação de fase (mulita) durante o aquecimento das amostras. Difração de raios X sustentou as hipóteses levantadas nos termograms das amostras...
The influence of sugar cane bagasse ash and sedimentary rock, added to clay material, in the sintering process was studied. The clay material and the additives were characterized by X-ray diffraction, X-ray spectroscopy and thermal analysis. The ash and rock samples were triturated, sieved to 0.088 mm and 0.125 mm, respectively, and incorporated at 0, 20, 40, 60, and 80% in the clay material. Prismatic probes were prepared, each pressed at 19 Mpa in a manual press. The pieces were sintered at 500, 800, 900, 1000, 1100 ans 1200ºC, and then characterized by X-ray diffraction and tests for water absorption, linear shrinkage, apparent specific mass, loss on ignition, apparent porosity and flexural strength. X-ray diffraction showed that the ash was composed of crystalline material, predominantly quartz; the sedimentary rock contained, besides quartz, mica; and the main phase of the clay material was kaolinite, but also contained aluminum hydroxide and iron oxides in lower concentrations. Chemical analysis showed that, besides silicon, the ash and the sedimentary rock also contained concentrations of oxides of aluminum, potassium, calcium, iron and magnesium, while in the clay material, silicon oxide, aluminum, iron and titanium were predominant. Thermal analyses of the different of the mixtures showed some reactions that indicated transformation (inversion of the quartz), decomposition (loss of hydroxides) and phase formation (mullite) during the heating of the samples. X-ray diffraction supported the findings in the thermal analysis of the analyzed samples. The tests showed that both the ash and sedimentary rock worsened the mechanical properties of the clay material, although they contributed to the improvement of other attributes. The presence of quartz in the ash and rock hindered the formation of the mullite phase formed during the sintering process... (Complete abstract click electronic acess below)
The influence of sugar cane bagasse ash and sedimentary rock, added to clay material, in the sintering process was studied. The clay material and the additives were characterized by X-ray diffraction, X-ray spectroscopy and thermal analysis. The ash and rock samples were triturated, sieved to 0.088 mm and 0.125 mm, respectively, and incorporated at 0, 20, 40, 60, and 80% in the clay material. Prismatic probes were prepared, each pressed at 19 Mpa in a manual press. The pieces were sintered at 500, 800, 900, 1000, 1100 ans 1200ºC, and then characterized by X-ray diffraction and tests for water absorption, linear shrinkage, apparent specific mass, loss on ignition, apparent porosity and flexural strength. X-ray diffraction showed that the ash was composed of crystalline material, predominantly quartz; the sedimentary rock contained, besides quartz, mica; and the main phase of the clay material was kaolinite, but also contained aluminum hydroxide and iron oxides in lower concentrations. Chemical analysis showed that, besides silicon, the ash and the sedimentary rock also contained concentrations of oxides of aluminum, potassium, calcium, iron and magnesium, while in the clay material, silicon oxide, aluminum, iron and titanium were predominant. Thermal analyses of the different of the mixtures showed some reactions that indicated transformation (inversion of the quartz), decomposition (loss of hydroxides) and phase formation (mullite) during the heating of the samples. X-ray diffraction supported the findings in the thermal analysis of the analyzed samples. The tests showed that both the ash and sedimentary rock worsened the mechanical properties of the clay material, although they contributed to the improvement of other attributes. The presence of quartz in the ash and rock hindered the formation of the mullite phase formed during the sintering process... (Complete abstract click electronic acess below)
Descrição
Palavras-chave
Sinterização, Rocha sedimentar, Argilominerais, Sintering, Sedimentary rock
Como citar
SOUZA, Agda Eunice de. Argilominerais: influência dos aditivos (cinza de bagaço de cana-de-acúcar e rocha sedimentar) no processo de sinterização. 2008. xix, 86 f. Dissertação (mestrado) - Universidade Estadual Paulista, Faculdade de Ciências de Bauru, 2008.