Navegando por Autor "COSTA, Augusto Fernando de Freitas"

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    Estudo da Influência do Óxido de Cálcio na Redução e Estabilidade da Alcalinidade do Resíduo de Bauxita Quando da Adição de Dióxido de Carbono
    (Instituto de Tecnologia, 2016) COSTA, Augusto Fernando de Freitas; SOUZA, José Antônio da Silva
    "The study investigates the reduction of alkalinity in bauxite residue (red mud) from the Bayer process through the addition of calcium oxide (CaO) and injection of carbon dioxide (CO₂) in a bubbling reactor. The suspension's pH was monitored over 15 months, decreasing from 13 to 8.5, indicating alkalinity stabilization. The formation of stable mineral compounds, such as calcite and dolomite, was confirmed by XRD and XRF analyses. It was concluded that adding 10% CaO is economically viable for alkalinity reduction, enabling residue reuse with lower environmental risk."