Efeito da ativação mecânica de uma formulação de talco/caulim/alumina sobre o mecanismo e a cinética de formação de cordierita

Química Nova

João Batista Rodrigues Neto²  Dachamir Hotza¹  Rodrigo Moreno¹ 

[1] ,Universidade Federal de Santa CatarinaAraranguá SC ,Brasil

关键词: mechanical activation;    cordierite;    high energy milling;   

DOI  :  10.5935/0100-4042.20140034

来源: SciELO

【 摘 要 】

In this study, the influence of mechanical activation by intensive ball milling of a stoichiometric mixture of talc, kaolin, and alumina on the mechanism and kinetics of cordierite (2MgO·2Al2O3·5SiO2) formation was evaluated. The raw materials were characterized by chemical analysis, X-ray diffraction (XRD), laser diffraction, and helium pycnometry. The kinetics and mechanism of cordierite formation were studied by XRD, differential thermal analysis, and dilatometry in order to describe the phase formation as a function of temperature (1000-1400 ºC), time of thermochemical treatment (0-4 h), and grinding time of the mixture (0-45 min). Finally, the optimal conditions of the thermochemical treatment that ensured the formation of cordierite were determined: milling time of 45 min and thermal treatment at 1280 ºC for 1 h.

【 授权许可】

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