Red Mud from Brazil: Thermal Behavior and Physical Properties

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• 作者：Maria L煤cia Pereira Antunes ; Sara Jane Couperthwaite ; Fabiano Tomazini da Concei莽茫o ; Carolina Petrisin Costa de Jesus ; Pedro Kunihiko Kiyohara ; Antonio Carlos Vieira Coelho ; Ray Leslie Frost
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2012
• 出版时间：January 18, 2012
• 年：2012
• 卷：51
• 期：2
• 页码：775-779
• 全文大小：802K
• 年卷期：v.51,no.2(January 18, 2012)
• ISSN：1520-5045

文摘

The main constituents of red mud produced in Aluminio city (S.P., Brazil) are iron, aluminum, and silicon oxides. It has been determined that the average particle diameter for this red mud is between 0.05 and 0.002 mm. It is observed that a decrease in the percentage of smaller particles occurs at temperatures greater than 400 掳C. This observation corresponds with the thermal analysis and X-ray diffraction (XRD) data, which illustrate the phase transition of goethite to hematite. A 10% mass loss is observed in the thermal analysis patterns due to the hydroxide鈥搊xide phase transitions of iron (primary phase transition) and aluminum (to a lesser extent). The disappearance and appearance of the different phases of iron and aluminum confirms the decomposition reactions proposed by the thermal analysis data. This Brazilian red mud has been classified as mesoporous at all temperatures except between 400 and 500 掳C where the classification changes to micro/mesoporous.