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  • 1 UFRRJ Departamento de Geociências CEP 23890-000 Seropédica, RJ Brazil CEP 23890-000 Seropédica, RJ Brazil
  • 2 Centro de Pesquisa Leopoldo Migues Rio de Janeiro CEP 21949-900, RJ Brazil Rio de Janeiro CEP 21949-900, RJ Brazil
  • 3 Centro de Tecnologia Departamento de Processos Orgânicos/EQ/UFRJ Rio de Janeiro CEP 21949-900, RJ Brazil Rio de Janeiro CEP 21949-900, RJ Brazil
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Abstract  

Thermal degradation of granite and marble industry reject (GMIR), a red clay (RC)and their composites were studied by non-isothermal thermogravimetry (TG/DTG) in nitrogen atmosphere, differential thermal analysis (DTA) and derivative thermogravimetry(DTG) in air atmosphere. Measurements were made in the temperature range of 25–1000,25–1200 and 25–1400C. The kinetic parameters were determined by Flynn–Wall and Kissinger's methods. The results indicate the absent dominance of one mechanism of reaction, and the composites show smaller values of kinetic parameters than GMIR or RC.

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